/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_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_15-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:21:10,459 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 13:21:10,462 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 13:21:10,490 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 13:21:10,490 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:21:10,492 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:21:10,494 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:21:10,496 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:21:10,498 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:21:10,500 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:21:10,502 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:21:10,503 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:21:10,504 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:21:10,506 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:21:10,508 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:21:10,509 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:21:10,510 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:21:10,511 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:21:10,514 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:21:10,518 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:21:10,521 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:21:10,523 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:21:10,524 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:21:10,526 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:21:10,530 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 13:21:10,542 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:21:10,543 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:21:10,545 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:21:10,546 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 13:21:10,565 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:21:10,565 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:21:10,568 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:21:10,568 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:21:10,569 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:21:10,569 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:21:10,569 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:21:10,569 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:21:10,569 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:21:10,570 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:21:10,570 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:21:10,570 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:21:10,570 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:21:10,571 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:21:10,571 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:21:10,571 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:21:10,571 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:21:10,572 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:21:10,572 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:21:10,572 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:21:10,572 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:21:10,573 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:21:10,573 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:21:10,573 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:21:10,573 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:21:10,574 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:21:10,574 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:10,574 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:21:10,574 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:21:10,575 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_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 13:21:10,971 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:21:10,994 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:21:11,000 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:21:11,003 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:21:11,003 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:21:11,004 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_15-2.c [2020-07-20 13:21:11,132 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9a7c37bf6/99778ccb8bf2430dadf4d4b815518539/FLAGc76ada369 [2020-07-20 13:21:11,981 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:21:11,985 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_15-2.c [2020-07-20 13:21:12,001 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9a7c37bf6/99778ccb8bf2430dadf4d4b815518539/FLAGc76ada369 [2020-07-20 13:21:12,038 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9a7c37bf6/99778ccb8bf2430dadf4d4b815518539 [2020-07-20 13:21:12,057 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:21:12,062 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:21:12,064 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:21:12,065 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:21:12,071 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:21:12,073 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:21:12" (1/1) ... [2020-07-20 13:21:12,078 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2554a81c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:12, skipping insertion in model container [2020-07-20 13:21:12,079 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:21:12" (1/1) ... [2020-07-20 13:21:12,092 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:21:12,116 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:21:12,359 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:21:12,368 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:21:12,391 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:21:12,412 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:21:12,413 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:12 WrapperNode [2020-07-20 13:21:12,414 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:21:12,415 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:21:12,415 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:21:12,416 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:21:12,431 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:12" (1/1) ... [2020-07-20 13:21:12,431 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:12" (1/1) ... [2020-07-20 13:21:12,439 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:12" (1/1) ... [2020-07-20 13:21:12,440 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:12" (1/1) ... [2020-07-20 13:21:12,447 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:12" (1/1) ... [2020-07-20 13:21:12,450 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:12" (1/1) ... [2020-07-20 13:21:12,451 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:12" (1/1) ... [2020-07-20 13:21:12,454 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:21:12,455 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:21:12,455 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:21:12,455 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:21:12,458 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:12" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:21:12,699 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:21:12,700 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:21:12,700 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-20 13:21:12,700 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:21:12,701 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 13:21:12,703 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:21:12,703 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-20 13:21:12,703 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:21:12,703 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:21:12,703 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:21:12,971 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:21:12,972 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 13:21:12,977 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:21:12 BoogieIcfgContainer [2020-07-20 13:21:12,977 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:21:12,979 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:21:12,979 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:21:12,984 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:21:12,984 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:21:12" (1/3) ... [2020-07-20 13:21:12,985 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53121652 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:21:12, skipping insertion in model container [2020-07-20 13:21:12,986 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:12" (2/3) ... [2020-07-20 13:21:12,986 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53121652 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:21:12, skipping insertion in model container [2020-07-20 13:21:12,987 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:21:12" (3/3) ... [2020-07-20 13:21:12,989 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_15-2.c [2020-07-20 13:21:13,003 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:21:13,014 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:21:13,033 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:21:13,075 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:21:13,076 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:21:13,076 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:21:13,076 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:21:13,077 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:21:13,077 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:21:13,077 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:21:13,077 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:21:13,111 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 13:21:13,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 13:21:13,123 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:13,125 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:13,126 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:13,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:13,136 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-20 13:21:13,150 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:13,151 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1296111320] [2020-07-20 13:21:13,152 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:13,266 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:13,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:13,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:21:13,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:13,455 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:21:13,456 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:21:13,458 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1296111320] [2020-07-20 13:21:13,459 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:21:13,460 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:21:13,463 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [25745535] [2020-07-20 13:21:13,476 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:21:13,478 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:13,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:21:13,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:21:13,505 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-20 13:21:13,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:13,681 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 13:21:13,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:21:13,685 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 13:21:13,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:13,701 INFO L225 Difference]: With dead ends: 35 [2020-07-20 13:21:13,702 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 13:21:13,708 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:21:13,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 13:21:13,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 13:21:13,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 13:21:13,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 13:21:13,782 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 13:21:13,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:13,784 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 13:21:13,784 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:21:13,784 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 13:21:13,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 13:21:13,787 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:13,787 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:14,001 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:14,001 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:14,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:14,002 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-20 13:21:14,003 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:14,004 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1972847264] [2020-07-20 13:21:14,005 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:14,047 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:14,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:14,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:21:14,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:14,127 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:21:14,128 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:21:14,129 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1972847264] [2020-07-20 13:21:14,136 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:21:14,137 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:21:14,138 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819629861] [2020-07-20 13:21:14,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:21:14,143 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:14,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:21:14,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:21:14,147 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 13:21:14,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:14,271 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 13:21:14,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:21:14,273 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 13:21:14,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:14,275 INFO L225 Difference]: With dead ends: 27 [2020-07-20 13:21:14,276 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 13:21:14,278 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:21:14,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 13:21:14,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 13:21:14,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 13:21:14,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 13:21:14,289 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 13:21:14,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:14,290 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 13:21:14,290 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:21:14,290 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 13:21:14,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 13:21:14,293 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:14,294 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:14,508 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:14,510 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:14,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:14,511 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-20 13:21:14,512 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:14,512 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [56387831] [2020-07-20 13:21:14,512 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:14,561 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:14,561 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:14,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:21:14,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:14,637 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 13:21:14,638 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:14,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:14,972 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 13:21:14,973 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [56387831] [2020-07-20 13:21:14,973 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:14,973 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 13:21:14,974 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889833140] [2020-07-20 13:21:14,975 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 13:21:14,975 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:14,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 13:21:14,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 13:21:14,976 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-20 13:21:15,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:15,179 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-20 13:21:15,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 13:21:15,181 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-20 13:21:15,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:15,183 INFO L225 Difference]: With dead ends: 32 [2020-07-20 13:21:15,184 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 13:21:15,185 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:21:15,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 13:21:15,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 13:21:15,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 13:21:15,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 13:21:15,201 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-20 13:21:15,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:15,202 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 13:21:15,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 13:21:15,202 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 13:21:15,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 13:21:15,204 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:15,204 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:15,418 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:15,420 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:15,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:15,420 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-20 13:21:15,420 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:15,421 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1131294005] [2020-07-20 13:21:15,421 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:15,463 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:15,464 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:15,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:21:15,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:15,524 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 13:21:15,524 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:15,725 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:15,781 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 13:21:15,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1131294005] [2020-07-20 13:21:15,783 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:15,783 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 13:21:15,784 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292599237] [2020-07-20 13:21:15,784 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 13:21:15,785 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:15,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 13:21:15,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 13:21:15,786 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-20 13:21:15,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:15,936 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-20 13:21:15,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 13:21:15,938 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 13:21:15,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:15,941 INFO L225 Difference]: With dead ends: 37 [2020-07-20 13:21:15,941 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 13:21:15,943 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:21:15,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 13:21:15,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-20 13:21:15,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 13:21:15,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 13:21:15,955 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-20 13:21:15,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:15,956 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 13:21:15,956 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 13:21:15,956 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 13:21:15,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 13:21:15,958 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:15,959 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:16,175 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:16,176 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:16,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:16,177 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-20 13:21:16,179 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:16,179 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [889147459] [2020-07-20 13:21:16,180 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:16,235 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:16,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:16,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:21:16,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:16,299 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 13:21:16,300 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:16,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:16,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:16,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:16,741 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:16,800 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 13:21:16,801 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [889147459] [2020-07-20 13:21:16,801 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:16,801 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 13:21:16,802 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785259138] [2020-07-20 13:21:16,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 13:21:16,803 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:16,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 13:21:16,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:21:16,804 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-20 13:21:17,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:17,020 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-20 13:21:17,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:21:17,020 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 13:21:17,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:17,023 INFO L225 Difference]: With dead ends: 42 [2020-07-20 13:21:17,024 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 13:21:17,025 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:21:17,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 13:21:17,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-20 13:21:17,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 13:21:17,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 13:21:17,040 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-20 13:21:17,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:17,040 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 13:21:17,041 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 13:21:17,041 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 13:21:17,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 13:21:17,043 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:17,044 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:17,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:17,257 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:17,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:17,258 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-20 13:21:17,258 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:17,259 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1189494753] [2020-07-20 13:21:17,259 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:17,302 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:17,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:17,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:21:17,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:17,384 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-20 13:21:17,384 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:17,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:17,745 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:17,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:17,788 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 13:21:17,789 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1189494753] [2020-07-20 13:21:17,790 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:17,790 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 13:21:17,791 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198445413] [2020-07-20 13:21:17,792 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 13:21:17,792 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:17,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 13:21:17,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:21:17,793 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-20 13:21:17,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:17,993 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-20 13:21:17,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:21:17,994 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 13:21:17,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:17,998 INFO L225 Difference]: With dead ends: 47 [2020-07-20 13:21:17,998 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 13:21:18,000 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:21:18,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 13:21:18,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-20 13:21:18,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 13:21:18,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 13:21:18,015 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-20 13:21:18,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:18,015 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 13:21:18,016 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 13:21:18,016 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 13:21:18,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 13:21:18,019 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:18,019 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:18,223 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:18,224 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:18,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:18,225 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-20 13:21:18,226 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:18,226 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [704604648] [2020-07-20 13:21:18,227 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:18,288 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:18,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:18,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:21:18,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:18,366 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-20 13:21:18,367 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:18,930 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:19,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:19,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:19,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:19,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:19,164 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 13:21:19,165 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [704604648] [2020-07-20 13:21:19,165 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:19,166 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 13:21:19,166 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1116841228] [2020-07-20 13:21:19,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 13:21:19,169 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:19,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 13:21:19,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 13:21:19,170 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-20 13:21:19,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:19,458 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-20 13:21:19,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:21:19,459 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-20 13:21:19,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:19,465 INFO L225 Difference]: With dead ends: 52 [2020-07-20 13:21:19,466 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 13:21:19,470 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:21:19,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 13:21:19,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-20 13:21:19,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 13:21:19,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 13:21:19,501 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-20 13:21:19,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:19,502 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 13:21:19,503 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 13:21:19,503 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 13:21:19,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-20 13:21:19,507 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:19,507 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:19,720 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:19,721 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:19,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:19,722 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-20 13:21:19,723 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:19,724 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [625226121] [2020-07-20 13:21:19,724 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:19,797 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:19,797 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:19,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:21:19,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:19,899 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-20 13:21:19,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:20,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:20,661 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:20,669 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:20,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:20,795 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-20 13:21:20,796 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [625226121] [2020-07-20 13:21:20,797 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:20,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 13:21:20,797 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803093167] [2020-07-20 13:21:20,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 13:21:20,801 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:20,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 13:21:20,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 13:21:20,802 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-20 13:21:21,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:21,021 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-20 13:21:21,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:21:21,026 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-20 13:21:21,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:21,030 INFO L225 Difference]: With dead ends: 57 [2020-07-20 13:21:21,030 INFO L226 Difference]: Without dead ends: 53 [2020-07-20 13:21:21,032 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:21:21,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-20 13:21:21,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-20 13:21:21,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 13:21:21,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 13:21:21,052 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-20 13:21:21,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:21,053 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 13:21:21,054 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 13:21:21,054 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 13:21:21,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 13:21:21,057 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:21,057 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:21,271 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:21,271 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:21,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:21,272 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-20 13:21:21,273 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:21,273 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [535852823] [2020-07-20 13:21:21,274 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:21,373 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:21,375 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:21,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:21:21,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:21,532 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-20 13:21:21,533 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:22,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:22,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:22,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:22,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:22,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:22,780 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 13:21:22,781 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [535852823] [2020-07-20 13:21:22,781 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:22,781 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 13:21:22,782 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806804824] [2020-07-20 13:21:22,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:21:22,783 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:22,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:21:22,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:21:22,786 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-20 13:21:23,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:23,202 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-20 13:21:23,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:21:23,202 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-20 13:21:23,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:23,207 INFO L225 Difference]: With dead ends: 62 [2020-07-20 13:21:23,208 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 13:21:23,210 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:21:23,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 13:21:23,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-20 13:21:23,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 13:21:23,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 13:21:23,228 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-20 13:21:23,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:23,228 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 13:21:23,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:21:23,229 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 13:21:23,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-20 13:21:23,233 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:23,234 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:23,448 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:23,449 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:23,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:23,450 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-20 13:21:23,450 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:23,451 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [288853735] [2020-07-20 13:21:23,451 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:23,569 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:23,570 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:23,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:21:23,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:23,700 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-20 13:21:23,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:24,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:24,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:24,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:24,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:25,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:25,066 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:25,153 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-20 13:21:25,154 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [288853735] [2020-07-20 13:21:25,154 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:25,154 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 13:21:25,155 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668384679] [2020-07-20 13:21:25,158 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:21:25,158 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:25,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:21:25,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:21:25,160 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-20 13:21:25,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:25,413 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-20 13:21:25,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:21:25,414 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-20 13:21:25,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:25,418 INFO L225 Difference]: With dead ends: 67 [2020-07-20 13:21:25,418 INFO L226 Difference]: Without dead ends: 63 [2020-07-20 13:21:25,420 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:21:25,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-20 13:21:25,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-20 13:21:25,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 13:21:25,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 13:21:25,439 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-20 13:21:25,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:25,440 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 13:21:25,440 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:21:25,440 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 13:21:25,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-20 13:21:25,445 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:25,446 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:25,660 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:25,662 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:25,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:25,663 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-20 13:21:25,664 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:25,664 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [690071761] [2020-07-20 13:21:25,664 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:25,837 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:25,837 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:25,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 524 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:21:25,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:26,059 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-20 13:21:26,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:27,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:27,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:28,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:28,221 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:28,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:28,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:28,435 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-20 13:21:28,436 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [690071761] [2020-07-20 13:21:28,437 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:28,437 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 13:21:28,438 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1541336829] [2020-07-20 13:21:28,439 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:21:28,439 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:28,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:21:28,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:21:28,441 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-20 13:21:28,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:28,759 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-20 13:21:28,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:21:28,760 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-20 13:21:28,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:28,763 INFO L225 Difference]: With dead ends: 72 [2020-07-20 13:21:28,763 INFO L226 Difference]: Without dead ends: 68 [2020-07-20 13:21:28,765 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:21:28,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-20 13:21:28,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-20 13:21:28,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 13:21:28,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 13:21:28,781 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-20 13:21:28,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:28,783 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 13:21:28,783 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:21:28,783 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 13:21:28,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2020-07-20 13:21:28,789 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:28,789 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 35, 21, 21, 21, 21, 21, 21, 21, 14, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:29,003 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:29,004 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:29,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:29,005 INFO L82 PathProgramCache]: Analyzing trace with hash -1101007572, now seen corresponding path program 5 times [2020-07-20 13:21:29,005 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:29,006 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1363871704] [2020-07-20 13:21:29,006 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:29,180 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:29,181 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:29,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 544 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:21:29,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:29,450 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1061 refuted. 0 times theorem prover too weak. 3827 trivial. 0 not checked. [2020-07-20 13:21:29,451 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:31,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:31,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:31,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:31,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:31,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:32,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:32,116 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1101 refuted. 0 times theorem prover too weak. 3787 trivial. 0 not checked. [2020-07-20 13:21:32,117 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1363871704] [2020-07-20 13:21:32,117 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:32,117 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 13:21:32,117 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351965505] [2020-07-20 13:21:32,119 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:21:32,119 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:32,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:21:32,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:21:32,120 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-20 13:21:32,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:32,449 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-20 13:21:32,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:21:32,451 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 300 [2020-07-20 13:21:32,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:32,456 INFO L225 Difference]: With dead ends: 77 [2020-07-20 13:21:32,456 INFO L226 Difference]: Without dead ends: 73 [2020-07-20 13:21:32,458 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 605 GetRequests, 572 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:21:32,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-20 13:21:32,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-20 13:21:32,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 13:21:32,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 13:21:32,475 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 300 [2020-07-20 13:21:32,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:32,477 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 13:21:32,477 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:21:32,477 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 13:21:32,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 469 [2020-07-20 13:21:32,483 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:32,483 INFO L422 BasicCegarLoop]: trace histogram [71, 71, 36, 35, 35, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:32,698 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:32,699 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:32,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:32,700 INFO L82 PathProgramCache]: Analyzing trace with hash -897924696, now seen corresponding path program 6 times [2020-07-20 13:21:32,700 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:32,700 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1862145025] [2020-07-20 13:21:32,701 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:32,963 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:32,964 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:32,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 852 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:21:32,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:33,192 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 1995 refuted. 0 times theorem prover too weak. 10614 trivial. 0 not checked. [2020-07-20 13:21:33,193 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:35,627 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:36,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:36,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:36,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:36,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:36,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:36,885 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:36,886 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:37,040 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 2046 refuted. 0 times theorem prover too weak. 10563 trivial. 0 not checked. [2020-07-20 13:21:37,041 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1862145025] [2020-07-20 13:21:37,041 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:37,041 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 13:21:37,041 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1674110535] [2020-07-20 13:21:37,042 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:21:37,042 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:37,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:21:37,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:21:37,043 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-20 13:21:37,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:37,443 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-20 13:21:37,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:21:37,443 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 468 [2020-07-20 13:21:37,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:37,448 INFO L225 Difference]: With dead ends: 82 [2020-07-20 13:21:37,448 INFO L226 Difference]: Without dead ends: 78 [2020-07-20 13:21:37,450 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 943 GetRequests, 905 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:21:37,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-20 13:21:37,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-20 13:21:37,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 13:21:37,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 13:21:37,466 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 468 [2020-07-20 13:21:37,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:37,467 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 13:21:37,467 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:21:37,468 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 13:21:37,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-20 13:21:37,472 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:37,472 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:37,685 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:37,686 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:37,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:37,687 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-20 13:21:37,687 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:37,688 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1981437068] [2020-07-20 13:21:37,688 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:37,895 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:37,895 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:37,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 818 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:21:37,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:38,167 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-20 13:21:38,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:40,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:40,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:40,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:41,224 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:41,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:41,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:41,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:41,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:41,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:41,712 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-20 13:21:41,712 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1981437068] [2020-07-20 13:21:41,713 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:41,713 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 13:21:41,713 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483376066] [2020-07-20 13:21:41,714 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:21:41,714 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:41,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:21:41,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:21:41,715 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-20 13:21:42,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:42,331 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-20 13:21:42,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:21:42,332 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-20 13:21:42,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:42,338 INFO L225 Difference]: With dead ends: 87 [2020-07-20 13:21:42,338 INFO L226 Difference]: Without dead ends: 83 [2020-07-20 13:21:42,341 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:21:42,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-20 13:21:42,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-20 13:21:42,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 13:21:42,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 13:21:42,386 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-20 13:21:42,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:42,387 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 13:21:42,387 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:21:42,388 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 13:21:42,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 872 [2020-07-20 13:21:42,399 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:42,399 INFO L422 BasicCegarLoop]: trace histogram [133, 133, 67, 66, 66, 66, 66, 66, 66, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:42,612 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:42,613 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:42,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:42,614 INFO L82 PathProgramCache]: Analyzing trace with hash -1701713687, now seen corresponding path program 7 times [2020-07-20 13:21:42,615 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:42,615 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1691064622] [2020-07-20 13:21:42,616 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:43,001 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:43,001 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:43,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 1586 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:21:43,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:43,608 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4406 refuted. 0 times theorem prover too weak. 40653 trivial. 0 not checked. [2020-07-20 13:21:43,608 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:46,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:46,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:48,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:49,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:49,019 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:49,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:49,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:49,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:49,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:49,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:49,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:49,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:50,151 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4476 refuted. 0 times theorem prover too weak. 40583 trivial. 0 not checked. [2020-07-20 13:21:50,152 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1691064622] [2020-07-20 13:21:50,152 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:50,152 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 13:21:50,153 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [844804656] [2020-07-20 13:21:50,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:21:50,155 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:50,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:21:50,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:21:50,156 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-20 13:21:50,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:50,714 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-20 13:21:50,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:21:50,716 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 871 [2020-07-20 13:21:50,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:50,723 INFO L225 Difference]: With dead ends: 92 [2020-07-20 13:21:50,723 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 13:21:50,725 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1750 GetRequests, 1707 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:21:50,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 13:21:50,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-20 13:21:50,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 13:21:50,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 13:21:50,745 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 871 [2020-07-20 13:21:50,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:50,748 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 13:21:50,748 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:21:50,748 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 13:21:50,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1078 [2020-07-20 13:21:50,768 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:50,768 INFO L422 BasicCegarLoop]: trace histogram [157, 157, 128, 78, 78, 78, 78, 78, 78, 78, 50, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:50,982 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:50,983 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:50,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:50,984 INFO L82 PathProgramCache]: Analyzing trace with hash 860290653, now seen corresponding path program 7 times [2020-07-20 13:21:50,985 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:50,985 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [83046397] [2020-07-20 13:21:50,986 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:51,449 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:51,449 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:51,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 1950 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:21:51,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:52,155 INFO L134 CoverageAnalysis]: Checked inductivity of 69124 backedges. 831 proven. 5812 refuted. 0 times theorem prover too weak. 62481 trivial. 0 not checked. [2020-07-20 13:21:52,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:56,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:56,091 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:57,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:58,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:58,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:58,541 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:58,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:58,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:58,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:58,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:59,803 INFO L134 CoverageAnalysis]: Checked inductivity of 69124 backedges. 831 proven. 5889 refuted. 0 times theorem prover too weak. 62404 trivial. 0 not checked. [2020-07-20 13:21:59,804 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [83046397] [2020-07-20 13:21:59,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:59,805 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 13:21:59,805 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543725196] [2020-07-20 13:21:59,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:21:59,809 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:59,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:21:59,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:21:59,809 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-20 13:22:00,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:00,587 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-20 13:22:00,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:22:00,588 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1077 [2020-07-20 13:22:00,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:00,595 INFO L225 Difference]: With dead ends: 97 [2020-07-20 13:22:00,595 INFO L226 Difference]: Without dead ends: 93 [2020-07-20 13:22:00,597 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2161 GetRequests, 2118 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:22:00,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-20 13:22:00,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-20 13:22:00,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 13:22:00,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 13:22:00,621 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1077 [2020-07-20 13:22:00,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:00,625 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 13:22:00,625 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:22:00,625 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 13:22:00,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1574 [2020-07-20 13:22:00,654 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:00,655 INFO L422 BasicCegarLoop]: trace histogram [241, 241, 121, 120, 120, 120, 120, 120, 120, 120, 120, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:00,869 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:00,870 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:00,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:00,871 INFO L82 PathProgramCache]: Analyzing trace with hash 78333505, now seen corresponding path program 8 times [2020-07-20 13:22:00,872 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:00,872 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [899177904] [2020-07-20 13:22:00,874 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:01,479 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:01,480 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:01,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 2861 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:22:01,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:02,682 INFO L134 CoverageAnalysis]: Checked inductivity of 151380 backedges. 1563 proven. 9337 refuted. 0 times theorem prover too weak. 140480 trivial. 0 not checked. [2020-07-20 13:22:02,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:07,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:10,633 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:12,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:12,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:12,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:13,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:13,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:13,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:13,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:13,523 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:13,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:13,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:14,863 INFO L134 CoverageAnalysis]: Checked inductivity of 151380 backedges. 1563 proven. 9429 refuted. 0 times theorem prover too weak. 140388 trivial. 0 not checked. [2020-07-20 13:22:14,864 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [899177904] [2020-07-20 13:22:14,864 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:14,865 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 13:22:14,865 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688515136] [2020-07-20 13:22:14,868 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:22:14,868 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:14,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:22:14,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:22:14,869 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-20 13:22:15,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:15,925 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-20 13:22:15,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:22:15,926 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1573 [2020-07-20 13:22:15,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:15,932 INFO L225 Difference]: With dead ends: 102 [2020-07-20 13:22:15,932 INFO L226 Difference]: Without dead ends: 98 [2020-07-20 13:22:15,934 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3155 GetRequests, 3107 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:22:15,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-20 13:22:15,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-20 13:22:15,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 13:22:15,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 13:22:15,951 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1573 [2020-07-20 13:22:15,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:15,953 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 13:22:15,953 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:22:15,953 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 13:22:15,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1843 [2020-07-20 13:22:15,991 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:15,992 INFO L422 BasicCegarLoop]: trace histogram [269, 269, 221, 134, 134, 134, 134, 134, 134, 134, 87, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:16,205 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:16,206 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:16,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:16,208 INFO L82 PathProgramCache]: Analyzing trace with hash -323852785, now seen corresponding path program 8 times [2020-07-20 13:22:16,208 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:16,208 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [471746932] [2020-07-20 13:22:16,209 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:16,924 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:16,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:16,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 3328 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:22:16,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:18,424 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11413 refuted. 0 times theorem prover too weak. 191022 trivial. 0 not checked. [2020-07-20 13:22:18,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:24,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:27,717 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:27,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:29,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:29,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:30,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:30,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:30,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:30,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:30,941 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:31,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:32,685 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11513 refuted. 0 times theorem prover too weak. 190922 trivial. 0 not checked. [2020-07-20 13:22:32,686 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [471746932] [2020-07-20 13:22:32,687 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:32,687 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 13:22:32,687 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1056916954] [2020-07-20 13:22:32,690 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:22:32,690 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:32,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:22:32,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:22:32,691 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-20 13:22:33,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:33,338 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-20 13:22:33,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:22:33,340 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1842 [2020-07-20 13:22:33,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:33,346 INFO L225 Difference]: With dead ends: 107 [2020-07-20 13:22:33,346 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 13:22:33,348 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3692 GetRequests, 3644 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:22:33,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 13:22:33,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-20 13:22:33,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 13:22:33,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 13:22:33,366 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1842 [2020-07-20 13:22:33,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:33,368 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 13:22:33,368 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:22:33,368 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 13:22:33,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2107 [2020-07-20 13:22:33,404 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:33,405 INFO L422 BasicCegarLoop]: trace histogram [323, 323, 162, 161, 161, 161, 161, 161, 161, 161, 161, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:33,606 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:33,606 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:33,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:33,608 INFO L82 PathProgramCache]: Analyzing trace with hash 211951896, now seen corresponding path program 9 times [2020-07-20 13:22:33,609 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:33,609 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1148014220] [2020-07-20 13:22:33,610 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:34,550 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:34,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:34,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 3827 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:22:34,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:36,707 INFO L134 CoverageAnalysis]: Checked inductivity of 272412 backedges. 2152 proven. 14276 refuted. 0 times theorem prover too weak. 255984 trivial. 0 not checked. [2020-07-20 13:22:36,708 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:44,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:48,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:51,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:52,425 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:52,426 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:53,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:53,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:53,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:53,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:53,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:54,014 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:54,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:55,898 INFO L134 CoverageAnalysis]: Checked inductivity of 272412 backedges. 2152 proven. 14393 refuted. 0 times theorem prover too weak. 255867 trivial. 0 not checked. [2020-07-20 13:22:55,898 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1148014220] [2020-07-20 13:22:55,898 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:55,899 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 13:22:55,899 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670047230] [2020-07-20 13:22:55,901 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 13:22:55,901 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:55,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 13:22:55,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:22:55,903 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-20 13:22:56,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:56,969 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-20 13:22:56,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:22:56,970 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2106 [2020-07-20 13:22:56,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:56,978 INFO L225 Difference]: With dead ends: 112 [2020-07-20 13:22:56,979 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 13:22:56,981 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4222 GetRequests, 4169 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 13:22:56,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 13:22:57,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-20 13:22:57,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 13:22:57,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 13:22:57,006 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2106 [2020-07-20 13:22:57,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:57,008 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 13:22:57,008 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 13:22:57,009 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 13:22:57,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2206 [2020-07-20 13:22:57,069 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:57,070 INFO L422 BasicCegarLoop]: trace histogram [323, 323, 260, 161, 161, 161, 161, 161, 161, 161, 99, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:57,283 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:57,284 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:57,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:57,286 INFO L82 PathProgramCache]: Analyzing trace with hash -576304576, now seen corresponding path program 9 times [2020-07-20 13:22:57,286 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:57,287 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [373936880] [2020-07-20 13:22:57,287 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:58,244 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:58,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:58,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 3986 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:22:58,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:23:01,633 INFO L134 CoverageAnalysis]: Checked inductivity of 293202 backedges. 2131 proven. 15429 refuted. 0 times theorem prover too weak. 275642 trivial. 0 not checked. [2020-07-20 13:23:01,634 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:23:10,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:14,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:17,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:17,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:18,307 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:19,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:19,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:19,741 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:19,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:19,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:19,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:19,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:21,928 INFO L134 CoverageAnalysis]: Checked inductivity of 293202 backedges. 2131 proven. 15555 refuted. 0 times theorem prover too weak. 275516 trivial. 0 not checked. [2020-07-20 13:23:21,929 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [373936880] [2020-07-20 13:23:21,929 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:23:21,929 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 13:23:21,930 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308864840] [2020-07-20 13:23:21,931 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 13:23:21,932 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:23:21,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 13:23:21,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:23:21,932 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-20 13:23:23,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:23:23,016 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-20 13:23:23,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:23:23,018 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2205 [2020-07-20 13:23:23,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:23:23,026 INFO L225 Difference]: With dead ends: 117 [2020-07-20 13:23:23,026 INFO L226 Difference]: Without dead ends: 113 [2020-07-20 13:23:23,029 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4419 GetRequests, 4366 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 13:23:23,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-20 13:23:23,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-20 13:23:23,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 13:23:23,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 13:23:23,057 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2205 [2020-07-20 13:23:23,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:23:23,059 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 13:23:23,059 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 13:23:23,059 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 13:23:23,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3979 [2020-07-20 13:23:23,224 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:23:23,226 INFO L422 BasicCegarLoop]: trace histogram [611, 611, 306, 305, 305, 305, 305, 305, 305, 305, 305, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:23:23,429 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:23,431 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:23:23,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:23:23,433 INFO L82 PathProgramCache]: Analyzing trace with hash 1096565120, now seen corresponding path program 10 times [2020-07-20 13:23:23,433 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:23:23,433 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1785594638] [2020-07-20 13:23:23,433 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:25,063 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:23:25,063 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:23:25,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 7224 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 13:23:25,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:23:31,675 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4000 proven. 30795 refuted. 0 times theorem prover too weak. 942425 trivial. 0 not checked. [2020-07-20 13:23:31,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:23:50,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:50,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:59,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:03,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:05,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:07,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:08,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:08,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:08,764 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:09,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:09,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:09,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:16,538 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4000 proven. 30940 refuted. 0 times theorem prover too weak. 942280 trivial. 0 not checked. [2020-07-20 13:24:16,539 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1785594638] [2020-07-20 13:24:16,539 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:24:16,540 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 13:24:16,541 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777008130] [2020-07-20 13:24:16,543 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 13:24:16,544 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:24:16,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 13:24:16,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 13:24:16,545 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-20 13:24:18,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:24:18,224 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-20 13:24:18,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 13:24:18,226 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 3978 [2020-07-20 13:24:18,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:24:18,236 INFO L225 Difference]: With dead ends: 122 [2020-07-20 13:24:18,236 INFO L226 Difference]: Without dead ends: 118 [2020-07-20 13:24:18,238 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7967 GetRequests, 7909 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 13:24:18,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-20 13:24:18,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-20 13:24:18,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 13:24:18,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 13:24:18,262 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 3978 [2020-07-20 13:24:18,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:24:18,266 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 13:24:18,266 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 13:24:18,266 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 13:24:18,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5131 [2020-07-20 13:24:18,440 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:24:18,442 INFO L422 BasicCegarLoop]: trace histogram [755, 755, 593, 377, 377, 377, 377, 377, 377, 377, 216, 162, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:24:18,655 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:18,656 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:24:18,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:24:18,659 INFO L82 PathProgramCache]: Analyzing trace with hash 1930612962, now seen corresponding path program 10 times [2020-07-20 13:24:18,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:24:18,659 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [612879972] [2020-07-20 13:24:18,660 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:20,513 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:24:20,514 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:24:20,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 9265 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 13:24:20,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:24:33,132 INFO L134 CoverageAnalysis]: Checked inductivity of 1597572 backedges. 5277 proven. 40602 refuted. 0 times theorem prover too weak. 1551693 trivial. 0 not checked. [2020-07-20 13:24:33,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:24:39,408 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 13:24:39,518 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 13:24:39,632 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-20 13:24:56,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:10,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:10,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:17,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:17,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:20,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:20,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:23,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:23,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:24,033 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:24,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:24,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:25,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:25,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:25,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:25,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:25,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:35,915 INFO L134 CoverageAnalysis]: Checked inductivity of 1597572 backedges. 5277 proven. 40757 refuted. 0 times theorem prover too weak. 1551538 trivial. 0 not checked. [2020-07-20 13:25:35,915 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [612879972] [2020-07-20 13:25:35,916 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:25:35,917 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 13:25:35,918 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1700885844] [2020-07-20 13:25:35,922 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 13:25:35,923 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:25:35,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 13:25:35,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 13:25:35,924 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-20 13:25:38,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:25:38,245 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-20 13:25:38,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 13:25:38,251 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 5130 [2020-07-20 13:25:38,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:25:38,259 INFO L225 Difference]: With dead ends: 127 [2020-07-20 13:25:38,259 INFO L226 Difference]: Without dead ends: 123 [2020-07-20 13:25:38,261 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10270 GetRequests, 10212 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 13:25:38,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-20 13:25:38,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-20 13:25:38,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 13:25:38,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 13:25:38,292 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 5130 [2020-07-20 13:25:38,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:25:38,296 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 13:25:38,296 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 13:25:38,296 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 13:25:38,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9634 [2020-07-20 13:25:38,827 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:25:38,830 INFO L422 BasicCegarLoop]: trace histogram [1481, 1481, 741, 740, 740, 740, 740, 740, 740, 740, 740, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:25:39,031 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:25:39,032 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:25:39,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:25:39,035 INFO L82 PathProgramCache]: Analyzing trace with hash 1675983471, now seen corresponding path program 11 times [2020-07-20 13:25:39,036 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:25:39,036 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1280842841] [2020-07-20 13:25:39,036 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:25:42,590 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:25:42,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:25:42,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 17485 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 13:25:42,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:26:12,345 INFO L134 CoverageAnalysis]: Checked inductivity of 5750910 backedges. 10518 proven. 82758 refuted. 0 times theorem prover too weak. 5657634 trivial. 0 not checked. [2020-07-20 13:26:12,346 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:26:41,682 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:26:47,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:12,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:24,245 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:24,246 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:30,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:30,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:33,874 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:35,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:35,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:36,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:36,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:37,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:37,350 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:37,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:37,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:37,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:07,609 INFO L134 CoverageAnalysis]: Checked inductivity of 5750910 backedges. 10518 proven. 82934 refuted. 0 times theorem prover too weak. 5657458 trivial. 0 not checked. [2020-07-20 13:28:07,610 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1280842841] [2020-07-20 13:28:07,610 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:28:07,613 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 13:28:07,613 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952918951] [2020-07-20 13:28:07,620 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 13:28:07,621 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:28:07,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 13:28:07,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:28:07,622 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-20 13:28:09,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:28:09,599 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-20 13:28:09,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 13:28:09,602 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 9633 [2020-07-20 13:28:09,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:28:09,612 INFO L225 Difference]: With dead ends: 132 [2020-07-20 13:28:09,613 INFO L226 Difference]: Without dead ends: 128 [2020-07-20 13:28:09,614 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19278 GetRequests, 19215 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 13:28:09,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-20 13:28:09,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-20 13:28:09,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 13:28:09,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 13:28:09,639 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 9633 [2020-07-20 13:28:09,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:28:09,646 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 13:28:09,646 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 13:28:09,646 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 13:28:11,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10180 [2020-07-20 13:28:11,048 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:28:11,054 INFO L422 BasicCegarLoop]: trace histogram [1507, 1507, 1130, 753, 753, 753, 753, 753, 753, 753, 377, 377, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:28:11,255 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:28:11,255 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:28:11,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:28:11,259 INFO L82 PathProgramCache]: Analyzing trace with hash -345968448, now seen corresponding path program 11 times [2020-07-20 13:28:11,260 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:28:11,260 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [404324734] [2020-07-20 13:28:11,260 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:28:14,569 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:28:14,570 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:28:14,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 18384 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 13:28:14,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:28:49,153 INFO L134 CoverageAnalysis]: Checked inductivity of 6309481 backedges. 10107 proven. 90074 refuted. 0 times theorem prover too weak. 6209300 trivial. 0 not checked. [2020-07-20 13:28:49,154 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:28:56,908 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:28:57,014 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:29:02,053 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:29:02,271 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 13:29:02,376 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 13:29:02,489 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 13:29:02,594 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-20 13:29:02,699 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-20 13:29:59,896 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 13:30:00,000 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:30:02,444 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:30:02,564 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:30:02,693 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:30:02,819 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:30:02,926 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 13:30:03,129 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 13:30:03,238 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 13:30:03,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:03,941 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:25,955 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:30:28,491 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:30:28,794 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 13:30:29,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:49,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:49,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:55,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:55,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:59,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:59,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:03,861 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:03,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:05,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:07,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:07,626 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:07,627 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:07,920 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:07,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:08,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:43,742 INFO L134 CoverageAnalysis]: Checked inductivity of 6309481 backedges. 10107 proven. 90261 refuted. 0 times theorem prover too weak. 6209113 trivial. 0 not checked. [2020-07-20 13:31:43,743 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [404324734] [2020-07-20 13:31:43,743 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:31:43,746 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 13:31:43,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740122379] [2020-07-20 13:31:43,751 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 13:31:43,752 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:31:43,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 13:31:43,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:31:43,753 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-20 13:31:46,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:31:46,458 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-20 13:31:46,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 13:31:46,461 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 10179 [2020-07-20 13:31:46,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:31:46,477 INFO L225 Difference]: With dead ends: 137 [2020-07-20 13:31:46,477 INFO L226 Difference]: Without dead ends: 133 [2020-07-20 13:31:46,479 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20369 GetRequests, 20306 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 13:31:46,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-20 13:31:46,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-20 13:31:46,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 13:31:46,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 13:31:46,519 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 10179 [2020-07-20 13:31:46,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:31:46,525 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 13:31:46,525 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 13:31:46,525 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 13:31:48,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15211 [2020-07-20 13:31:48,938 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:31:48,943 INFO L422 BasicCegarLoop]: trace histogram [2339, 2339, 1170, 1169, 1169, 1169, 1169, 1169, 1169, 1169, 1169, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:31:49,144 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:31:49,144 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:31:49,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:31:49,149 INFO L82 PathProgramCache]: Analyzing trace with hash 1776967546, now seen corresponding path program 12 times [2020-07-20 13:31:49,149 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:31:49,149 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1959581092] [2020-07-20 13:31:49,150 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:31:55,662 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:31:55,662 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:31:55,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 27601 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 13:31:55,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:33:22,192 INFO L134 CoverageAnalysis]: Checked inductivity of 14350644 backedges. 17491 proven. 142997 refuted. 0 times theorem prover too weak. 14190156 trivial. 0 not checked. [2020-07-20 13:33:22,193 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:33:25,515 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 13:33:25,723 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:33:25,830 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:33:27,700 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 13:33:27,803 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 13:33:27,925 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:33:28,043 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:33:29,829 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 13:33:29,936 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 13:33:30,052 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:33:30,187 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:33:35,535 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:33:35,682 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:33:35,833 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:33:35,983 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:33:41,242 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:33:41,445 WARN L193 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:33:41,618 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:33:41,781 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:33:53,895 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 13:33:54,081 WARN L193 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 13:33:54,275 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 13:33:54,474 WARN L193 SmtUtils]: Spent 197.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 13:33:54,672 WARN L193 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-20 13:33:54,798 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 13:33:54,965 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 13:33:55,132 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-20 13:33:55,291 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-20 13:33:55,442 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 13:33:55,584 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 13:33:55,719 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 13:33:55,845 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 13:33:55,962 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:33:56,073 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:33:56,179 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 53