/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_6-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 22:19:19,239 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 22:19:19,241 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 22:19:19,262 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 22:19:19,263 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 22:19:19,265 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 22:19:19,267 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 22:19:19,278 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 22:19:19,284 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 22:19:19,287 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 22:19:19,289 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 22:19:19,290 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 22:19:19,291 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 22:19:19,293 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 22:19:19,296 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 22:19:19,297 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 22:19:19,299 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 22:19:19,300 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 22:19:19,302 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 22:19:19,307 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 22:19:19,313 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 22:19:19,317 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 22:19:19,318 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 22:19:19,319 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 22:19:19,322 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 22:19:19,334 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 22:19:19,335 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 22:19:19,337 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 22:19:19,338 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 22:19:19,374 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 22:19:19,374 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 22:19:19,376 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 22:19:19,376 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 22:19:19,376 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 22:19:19,379 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 22:19:19,379 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 22:19:19,379 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 22:19:19,379 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 22:19:19,379 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 22:19:19,380 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 22:19:19,380 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 22:19:19,380 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 22:19:19,380 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 22:19:19,380 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 22:19:19,381 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 22:19:19,381 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 22:19:19,381 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 22:19:19,382 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 22:19:19,383 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 22:19:19,383 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 22:19:19,383 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:19:19,383 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 22:19:19,384 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 22:19:19,384 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 22:19:19,384 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 22:19:19,384 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:19,384 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 22:19:19,384 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 22:19:19,385 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 22:19:19,686 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 22:19:19,701 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 22:19:19,706 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 22:19:19,707 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 22:19:19,708 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 22:19:19,709 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_6-1.c [2020-07-21 22:19:19,775 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b0f3e422d/dd6cd5f70f994c118cdcc3e30f59dbfa/FLAGd316050c7 [2020-07-21 22:19:20,221 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 22:19:20,222 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_6-1.c [2020-07-21 22:19:20,230 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b0f3e422d/dd6cd5f70f994c118cdcc3e30f59dbfa/FLAGd316050c7 [2020-07-21 22:19:20,656 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b0f3e422d/dd6cd5f70f994c118cdcc3e30f59dbfa [2020-07-21 22:19:20,665 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 22:19:20,668 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 22:19:20,669 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 22:19:20,670 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 22:19:20,674 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 22:19:20,675 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:19:20" (1/1) ... [2020-07-21 22:19:20,678 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3fca7f3d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:20, skipping insertion in model container [2020-07-21 22:19:20,679 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:19:20" (1/1) ... [2020-07-21 22:19:20,687 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 22:19:20,706 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 22:19:20,884 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:19:20,890 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 22:19:20,909 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:19:20,925 INFO L208 MainTranslator]: Completed translation [2020-07-21 22:19:20,926 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:20 WrapperNode [2020-07-21 22:19:20,926 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 22:19:20,927 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 22:19:20,927 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 22:19:20,927 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 22:19:20,944 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:20" (1/1) ... [2020-07-21 22:19:20,944 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:20" (1/1) ... [2020-07-21 22:19:20,950 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:20" (1/1) ... [2020-07-21 22:19:20,951 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:20" (1/1) ... [2020-07-21 22:19:21,047 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:20" (1/1) ... [2020-07-21 22:19:21,050 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:20" (1/1) ... [2020-07-21 22:19:21,051 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:20" (1/1) ... [2020-07-21 22:19:21,053 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 22:19:21,054 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 22:19:21,054 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 22:19:21,054 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 22:19:21,055 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:20" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:19:21,144 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 22:19:21,144 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 22:19:21,144 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 22:19:21,144 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 22:19:21,145 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 22:19:21,146 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 22:19:21,146 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 22:19:21,146 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 22:19:21,147 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 22:19:21,147 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 22:19:21,148 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 22:19:21,148 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 22:19:21,407 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 22:19:21,408 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 22:19:21,412 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:19:21 BoogieIcfgContainer [2020-07-21 22:19:21,413 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 22:19:21,414 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 22:19:21,415 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 22:19:21,418 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 22:19:21,419 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:19:20" (1/3) ... [2020-07-21 22:19:21,420 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40e9f5e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:19:21, skipping insertion in model container [2020-07-21 22:19:21,420 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:20" (2/3) ... [2020-07-21 22:19:21,421 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40e9f5e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:19:21, skipping insertion in model container [2020-07-21 22:19:21,421 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:19:21" (3/3) ... [2020-07-21 22:19:21,423 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_6-1.c [2020-07-21 22:19:21,435 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 22:19:21,455 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 22:19:21,483 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 22:19:21,520 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 22:19:21,520 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 22:19:21,520 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 22:19:21,520 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 22:19:21,522 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 22:19:21,523 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 22:19:21,523 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 22:19:21,523 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 22:19:21,547 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 22:19:21,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 22:19:21,555 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:21,556 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:21,557 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:21,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:21,564 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 22:19:21,574 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:21,574 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [650477063] [2020-07-21 22:19:21,575 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:21,648 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:21,648 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:21,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:19:21,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:21,754 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:19:21,755 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:19:21,756 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [650477063] [2020-07-21 22:19:21,757 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:19:21,758 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:19:21,759 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468915872] [2020-07-21 22:19:21,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:19:21,764 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:21,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:19:21,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:19:21,778 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 22:19:21,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:21,908 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 22:19:21,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:19:21,910 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 22:19:21,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:21,923 INFO L225 Difference]: With dead ends: 44 [2020-07-21 22:19:21,923 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 22:19:21,927 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 22:19:21,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 22:19:21,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 22:19:21,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 22:19:21,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 22:19:21,984 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 22:19:21,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:21,985 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 22:19:21,985 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:19:21,985 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 22:19:21,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 22:19:21,987 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:21,987 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:22,202 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:22,203 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:22,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:22,204 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 22:19:22,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:22,205 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [622905633] [2020-07-21 22:19:22,205 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:22,236 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:19:22,236 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:22,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:19:22,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:22,282 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:19:22,282 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:19:22,283 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [622905633] [2020-07-21 22:19:22,283 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:19:22,283 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:19:22,284 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496347938] [2020-07-21 22:19:22,285 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:19:22,286 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:22,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:19:22,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:19:22,287 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 22:19:22,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:22,373 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 22:19:22,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:19:22,375 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 22:19:22,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:22,376 INFO L225 Difference]: With dead ends: 36 [2020-07-21 22:19:22,377 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 22:19:22,378 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 22:19:22,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 22:19:22,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 22:19:22,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 22:19:22,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 22:19:22,389 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 22:19:22,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:22,390 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 22:19:22,390 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:19:22,390 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 22:19:22,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 22:19:22,392 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:22,392 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:22,606 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:22,607 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:22,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:22,608 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 22:19:22,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:22,608 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [284728638] [2020-07-21 22:19:22,609 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:22,634 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:22,634 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:22,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:19:22,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:22,695 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 22:19:22,696 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:22,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:22,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:22,992 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 22:19:22,995 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [284728638] [2020-07-21 22:19:22,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:22,996 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 22:19:22,996 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991275302] [2020-07-21 22:19:22,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 22:19:22,997 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:22,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 22:19:22,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 22:19:22,998 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-21 22:19:23,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:23,168 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 22:19:23,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 22:19:23,170 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-21 22:19:23,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:23,172 INFO L225 Difference]: With dead ends: 41 [2020-07-21 22:19:23,173 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 22:19:23,174 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 22:19:23,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 22:19:23,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 22:19:23,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 22:19:23,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 22:19:23,196 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 22:19:23,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:23,196 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 22:19:23,197 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 22:19:23,197 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 22:19:23,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 22:19:23,200 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:23,200 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:23,415 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:23,416 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:23,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:23,416 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 22:19:23,417 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:23,417 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1314354833] [2020-07-21 22:19:23,417 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:23,450 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:23,451 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:23,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:19:23,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:23,519 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 22:19:23,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:23,653 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:23,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:23,688 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 22:19:23,688 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1314354833] [2020-07-21 22:19:23,689 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:23,689 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 22:19:23,689 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568441211] [2020-07-21 22:19:23,690 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 22:19:23,690 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:23,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 22:19:23,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 22:19:23,691 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-21 22:19:23,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:23,827 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-21 22:19:23,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 22:19:23,827 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 22:19:23,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:23,832 INFO L225 Difference]: With dead ends: 46 [2020-07-21 22:19:23,832 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 22:19:23,834 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 22:19:23,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 22:19:23,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-21 22:19:23,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 22:19:23,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 22:19:23,848 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-21 22:19:23,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:23,849 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 22:19:23,849 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 22:19:23,851 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 22:19:23,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 22:19:23,853 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:23,853 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:24,053 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:24,055 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:24,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:24,056 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-21 22:19:24,056 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:24,057 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [870108287] [2020-07-21 22:19:24,057 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) [2020-07-21 22:19:24,085 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:24,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:24,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:19:24,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:24,151 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 22:19:24,151 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:24,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:24,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:24,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:24,535 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 22:19:24,536 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [870108287] [2020-07-21 22:19:24,536 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:24,536 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 22:19:24,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1352589654] [2020-07-21 22:19:24,537 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 22:19:24,537 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:24,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 22:19:24,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 22:19:24,538 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-21 22:19:24,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:24,743 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-21 22:19:24,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:19:24,744 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-21 22:19:24,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:24,746 INFO L225 Difference]: With dead ends: 51 [2020-07-21 22:19:24,746 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 22:19:24,747 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:19:24,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 22:19:24,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-21 22:19:24,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 22:19:24,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 22:19:24,757 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-21 22:19:24,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:24,757 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 22:19:24,757 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 22:19:24,757 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 22:19:24,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 22:19:24,759 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:24,759 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:24,968 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:24,970 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:24,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:24,970 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-21 22:19:24,971 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:24,972 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1913860339] [2020-07-21 22:19:24,972 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:25,000 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:25,000 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:25,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:19:25,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:25,051 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 22:19:25,052 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:25,278 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:25,328 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:25,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:25,367 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 22:19:25,368 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1913860339] [2020-07-21 22:19:25,368 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:25,368 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 22:19:25,369 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [664279922] [2020-07-21 22:19:25,369 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 22:19:25,369 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:25,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 22:19:25,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 22:19:25,370 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-21 22:19:25,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:25,552 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-21 22:19:25,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:19:25,555 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-21 22:19:25,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:25,561 INFO L225 Difference]: With dead ends: 56 [2020-07-21 22:19:25,561 INFO L226 Difference]: Without dead ends: 52 [2020-07-21 22:19:25,563 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:19:25,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-21 22:19:25,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-21 22:19:25,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 22:19:25,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 22:19:25,587 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-21 22:19:25,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:25,588 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 22:19:25,588 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 22:19:25,589 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 22:19:25,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-21 22:19:25,595 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:25,596 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:25,796 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:25,797 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:25,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:25,798 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-21 22:19:25,798 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:25,799 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1977542121] [2020-07-21 22:19:25,799 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:25,857 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:25,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:25,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:19:25,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:25,953 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 22:19:25,953 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:26,327 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:26,328 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:26,425 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:26,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:26,528 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 22:19:26,529 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1977542121] [2020-07-21 22:19:26,529 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:26,529 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 22:19:26,530 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646302433] [2020-07-21 22:19:26,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 22:19:26,530 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:26,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 22:19:26,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:19:26,531 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 14 states. [2020-07-21 22:19:26,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:26,756 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-21 22:19:26,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:19:26,756 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-07-21 22:19:26,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:26,758 INFO L225 Difference]: With dead ends: 61 [2020-07-21 22:19:26,759 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 22:19:26,760 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 22:19:26,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 22:19:26,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-21 22:19:26,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 22:19:26,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-21 22:19:26,770 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-21 22:19:26,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:26,771 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-21 22:19:26,771 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 22:19:26,771 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-21 22:19:26,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-21 22:19:26,773 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:26,773 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:26,980 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:26,980 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:26,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:26,981 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-21 22:19:26,982 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:26,982 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1737205211] [2020-07-21 22:19:26,983 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:27,036 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:27,036 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:27,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:19:27,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:27,101 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-07-21 22:19:27,103 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:27,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:27,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:27,557 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:27,558 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:27,609 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:27,646 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 22:19:27,646 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1737205211] [2020-07-21 22:19:27,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:27,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 22:19:27,647 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290641233] [2020-07-21 22:19:27,648 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 22:19:27,648 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:27,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 22:19:27,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:19:27,649 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 14 states. [2020-07-21 22:19:27,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:27,855 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2020-07-21 22:19:27,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:19:27,856 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 54 [2020-07-21 22:19:27,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:27,858 INFO L225 Difference]: With dead ends: 66 [2020-07-21 22:19:27,858 INFO L226 Difference]: Without dead ends: 62 [2020-07-21 22:19:27,860 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 90 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 22:19:27,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-21 22:19:27,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 45. [2020-07-21 22:19:27,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 22:19:27,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-21 22:19:27,872 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 54 [2020-07-21 22:19:27,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:27,873 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-21 22:19:27,873 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 22:19:27,873 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-21 22:19:27,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-21 22:19:27,875 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:27,875 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:28,089 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:28,090 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:28,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:28,091 INFO L82 PathProgramCache]: Analyzing trace with hash -975547772, now seen corresponding path program 3 times [2020-07-21 22:19:28,092 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:28,092 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1573936926] [2020-07-21 22:19:28,093 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:28,143 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:28,144 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:28,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:19:28,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:28,256 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 60 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-21 22:19:28,256 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:28,861 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:28,864 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:29,026 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:29,113 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:29,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:29,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:29,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:29,215 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 68 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-07-21 22:19:29,215 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1573936926] [2020-07-21 22:19:29,216 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:29,216 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 22:19:29,216 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88727833] [2020-07-21 22:19:29,217 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 22:19:29,217 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:29,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 22:19:29,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 22:19:29,218 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 16 states. [2020-07-21 22:19:29,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:29,483 INFO L93 Difference]: Finished difference Result 71 states and 124 transitions. [2020-07-21 22:19:29,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:19:29,484 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 78 [2020-07-21 22:19:29,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:29,487 INFO L225 Difference]: With dead ends: 71 [2020-07-21 22:19:29,487 INFO L226 Difference]: Without dead ends: 67 [2020-07-21 22:19:29,488 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 134 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 22:19:29,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-21 22:19:29,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 50. [2020-07-21 22:19:29,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-21 22:19:29,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-21 22:19:29,501 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 78 [2020-07-21 22:19:29,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:29,501 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-21 22:19:29,502 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 22:19:29,502 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-21 22:19:29,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-21 22:19:29,503 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:29,504 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:29,717 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:29,718 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:29,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:29,718 INFO L82 PathProgramCache]: Analyzing trace with hash 1891337214, now seen corresponding path program 2 times [2020-07-21 22:19:29,719 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:29,719 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1560084934] [2020-07-21 22:19:29,720 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:29,782 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:19:29,783 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:29,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:19:29,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:29,863 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 115 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-21 22:19:29,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:30,452 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:30,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:30,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:30,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:30,811 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 125 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-21 22:19:30,812 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1560084934] [2020-07-21 22:19:30,812 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:30,812 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 22:19:30,812 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2051535744] [2020-07-21 22:19:30,817 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 22:19:30,818 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:30,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 22:19:30,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:19:30,820 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 15 states. [2020-07-21 22:19:31,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:31,067 INFO L93 Difference]: Finished difference Result 76 states and 140 transitions. [2020-07-21 22:19:31,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:19:31,068 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 108 [2020-07-21 22:19:31,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:31,070 INFO L225 Difference]: With dead ends: 76 [2020-07-21 22:19:31,071 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 22:19:31,073 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 192 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 22:19:31,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 22:19:31,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-21 22:19:31,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-21 22:19:31,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-21 22:19:31,102 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 108 [2020-07-21 22:19:31,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:31,103 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-21 22:19:31,103 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 22:19:31,103 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-21 22:19:31,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2020-07-21 22:19:31,106 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:31,106 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 13, 12, 9, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:31,320 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:31,320 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:31,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:31,321 INFO L82 PathProgramCache]: Analyzing trace with hash -815433282, now seen corresponding path program 4 times [2020-07-21 22:19:31,322 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:31,322 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2119517356] [2020-07-21 22:19:31,322 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:31,391 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:19:31,391 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:31,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 22:19:31,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:31,520 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 332 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2020-07-21 22:19:31,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:32,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:32,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:32,888 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:33,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:33,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:33,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:33,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:33,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:33,222 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 346 refuted. 0 times theorem prover too weak. 786 trivial. 0 not checked. [2020-07-21 22:19:33,222 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2119517356] [2020-07-21 22:19:33,223 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:33,223 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 22:19:33,223 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666152180] [2020-07-21 22:19:33,224 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 22:19:33,224 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:33,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 22:19:33,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:19:33,225 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 17 states. [2020-07-21 22:19:33,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:33,515 INFO L93 Difference]: Finished difference Result 81 states and 156 transitions. [2020-07-21 22:19:33,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:19:33,516 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 208 [2020-07-21 22:19:33,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:33,519 INFO L225 Difference]: With dead ends: 81 [2020-07-21 22:19:33,519 INFO L226 Difference]: Without dead ends: 77 [2020-07-21 22:19:33,520 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 389 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 22:19:33,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-07-21 22:19:33,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 55. [2020-07-21 22:19:33,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-21 22:19:33,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-21 22:19:33,532 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 208 [2020-07-21 22:19:33,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:33,533 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-21 22:19:33,533 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 22:19:33,533 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-21 22:19:33,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2020-07-21 22:19:33,535 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:33,535 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:33,746 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:33,747 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:33,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:33,748 INFO L82 PathProgramCache]: Analyzing trace with hash -1298373331, now seen corresponding path program 2 times [2020-07-21 22:19:33,748 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:33,748 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1512886729] [2020-07-21 22:19:33,749 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:33,829 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:33,830 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:33,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:19:33,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:33,918 INFO L134 CoverageAnalysis]: Checked inductivity of 543 backedges. 42 proven. 156 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-21 22:19:33,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:34,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:34,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:34,764 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:34,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:34,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:34,913 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:34,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:34,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:35,000 INFO L134 CoverageAnalysis]: Checked inductivity of 543 backedges. 42 proven. 164 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2020-07-21 22:19:35,000 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1512886729] [2020-07-21 22:19:35,001 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:35,001 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 22:19:35,001 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908970216] [2020-07-21 22:19:35,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 22:19:35,003 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:35,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 22:19:35,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:19:35,004 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 15 states. [2020-07-21 22:19:35,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:35,280 INFO L93 Difference]: Finished difference Result 99 states and 221 transitions. [2020-07-21 22:19:35,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:19:35,284 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 148 [2020-07-21 22:19:35,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:35,287 INFO L225 Difference]: With dead ends: 99 [2020-07-21 22:19:35,287 INFO L226 Difference]: Without dead ends: 95 [2020-07-21 22:19:35,288 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 272 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 22:19:35,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-07-21 22:19:35,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 57. [2020-07-21 22:19:35,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-21 22:19:35,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 92 transitions. [2020-07-21 22:19:35,303 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 92 transitions. Word has length 148 [2020-07-21 22:19:35,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:35,304 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 92 transitions. [2020-07-21 22:19:35,304 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 22:19:35,304 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 92 transitions. [2020-07-21 22:19:35,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-07-21 22:19:35,306 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:35,307 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:35,520 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:35,521 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:35,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:35,522 INFO L82 PathProgramCache]: Analyzing trace with hash 2095197631, now seen corresponding path program 1 times [2020-07-21 22:19:35,522 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:35,523 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1713791254] [2020-07-21 22:19:35,523 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:35,608 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:35,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:35,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:19:35,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:35,686 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 48 proven. 89 refuted. 0 times theorem prover too weak. 221 trivial. 0 not checked. [2020-07-21 22:19:35,686 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:36,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:36,216 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:36,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:36,308 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:36,346 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 48 proven. 94 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2020-07-21 22:19:36,347 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1713791254] [2020-07-21 22:19:36,347 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:36,347 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 22:19:36,347 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1687669479] [2020-07-21 22:19:36,348 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:19:36,348 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:36,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:19:36,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:19:36,349 INFO L87 Difference]: Start difference. First operand 57 states and 92 transitions. Second operand 13 states. [2020-07-21 22:19:36,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:36,574 INFO L93 Difference]: Finished difference Result 99 states and 217 transitions. [2020-07-21 22:19:36,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:19:36,575 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 123 [2020-07-21 22:19:36,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:36,577 INFO L225 Difference]: With dead ends: 99 [2020-07-21 22:19:36,577 INFO L226 Difference]: Without dead ends: 95 [2020-07-21 22:19:36,578 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 226 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:19:36,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-07-21 22:19:36,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 59. [2020-07-21 22:19:36,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-07-21 22:19:36,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 98 transitions. [2020-07-21 22:19:36,589 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 98 transitions. Word has length 123 [2020-07-21 22:19:36,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:36,590 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 98 transitions. [2020-07-21 22:19:36,590 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:19:36,590 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 98 transitions. [2020-07-21 22:19:36,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2020-07-21 22:19:36,593 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:36,593 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 13, 12, 11, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:36,808 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:36,809 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:36,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:36,809 INFO L82 PathProgramCache]: Analyzing trace with hash 1017418174, now seen corresponding path program 1 times [2020-07-21 22:19:36,809 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:36,810 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1282494503] [2020-07-21 22:19:36,810 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:36,905 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:36,906 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:36,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 22:19:36,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:36,998 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 114 proven. 292 refuted. 0 times theorem prover too weak. 843 trivial. 0 not checked. [2020-07-21 22:19:36,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:38,101 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:38,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:38,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:38,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:38,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:38,575 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:38,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:38,626 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:38,679 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:38,726 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 116 proven. 304 refuted. 0 times theorem prover too weak. 829 trivial. 0 not checked. [2020-07-21 22:19:38,727 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1282494503] [2020-07-21 22:19:38,727 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:38,727 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 22:19:38,727 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077365342] [2020-07-21 22:19:38,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 22:19:38,728 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:38,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 22:19:38,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:19:38,729 INFO L87 Difference]: Start difference. First operand 59 states and 98 transitions. Second operand 17 states. [2020-07-21 22:19:39,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:39,145 INFO L93 Difference]: Finished difference Result 113 states and 271 transitions. [2020-07-21 22:19:39,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:19:39,146 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 216 [2020-07-21 22:19:39,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:39,149 INFO L225 Difference]: With dead ends: 113 [2020-07-21 22:19:39,150 INFO L226 Difference]: Without dead ends: 67 [2020-07-21 22:19:39,152 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 403 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 22:19:39,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-21 22:19:39,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-07-21 22:19:39,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-07-21 22:19:39,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 104 transitions. [2020-07-21 22:19:39,163 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 104 transitions. Word has length 216 [2020-07-21 22:19:39,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:39,164 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 104 transitions. [2020-07-21 22:19:39,164 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 22:19:39,164 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 104 transitions. [2020-07-21 22:19:39,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-07-21 22:19:39,167 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:39,168 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 7, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:39,380 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:39,381 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:39,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:39,381 INFO L82 PathProgramCache]: Analyzing trace with hash -1521837768, now seen corresponding path program 2 times [2020-07-21 22:19:39,381 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:39,382 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [807871702] [2020-07-21 22:19:39,382 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:39,488 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:39,488 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:39,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:19:39,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:39,562 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 62 proven. 114 refuted. 0 times theorem prover too weak. 254 trivial. 0 not checked. [2020-07-21 22:19:39,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:40,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:40,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:40,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:40,411 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:40,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:40,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:40,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:40,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:40,553 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 62 proven. 122 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2020-07-21 22:19:40,553 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [807871702] [2020-07-21 22:19:40,553 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:40,553 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 22:19:40,554 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880535951] [2020-07-21 22:19:40,555 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 22:19:40,555 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:40,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 22:19:40,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:19:40,555 INFO L87 Difference]: Start difference. First operand 67 states and 104 transitions. Second operand 15 states. [2020-07-21 22:19:40,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:40,813 INFO L93 Difference]: Finished difference Result 107 states and 201 transitions. [2020-07-21 22:19:40,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:19:40,814 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 135 [2020-07-21 22:19:40,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:40,818 INFO L225 Difference]: With dead ends: 107 [2020-07-21 22:19:40,818 INFO L226 Difference]: Without dead ends: 100 [2020-07-21 22:19:40,819 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 245 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 22:19:40,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-07-21 22:19:40,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 70. [2020-07-21 22:19:40,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-21 22:19:40,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 112 transitions. [2020-07-21 22:19:40,832 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 112 transitions. Word has length 135 [2020-07-21 22:19:40,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:40,833 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 112 transitions. [2020-07-21 22:19:40,833 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 22:19:40,833 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 112 transitions. [2020-07-21 22:19:40,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2020-07-21 22:19:40,835 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:40,835 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 10, 8, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:41,048 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:41,049 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:41,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:41,050 INFO L82 PathProgramCache]: Analyzing trace with hash 1102424554, now seen corresponding path program 3 times [2020-07-21 22:19:41,050 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:41,051 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [112081215] [2020-07-21 22:19:41,051 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:41,168 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:19:41,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:41,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 22:19:41,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:41,254 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 159 proven. 116 refuted. 0 times theorem prover too weak. 382 trivial. 0 not checked. [2020-07-21 22:19:41,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:42,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:42,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:42,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:42,576 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:42,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:42,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:42,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:42,717 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:42,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:42,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:42,849 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 159 proven. 130 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-21 22:19:42,849 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [112081215] [2020-07-21 22:19:42,849 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:42,850 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 22:19:42,850 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891530378] [2020-07-21 22:19:42,850 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 22:19:42,851 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:42,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 22:19:42,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:19:42,851 INFO L87 Difference]: Start difference. First operand 70 states and 112 transitions. Second operand 17 states. [2020-07-21 22:19:43,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:43,253 INFO L93 Difference]: Finished difference Result 107 states and 197 transitions. [2020-07-21 22:19:43,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:19:43,254 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 163 [2020-07-21 22:19:43,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:43,256 INFO L225 Difference]: With dead ends: 107 [2020-07-21 22:19:43,256 INFO L226 Difference]: Without dead ends: 75 [2020-07-21 22:19:43,258 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 297 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 22:19:43,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-07-21 22:19:43,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2020-07-21 22:19:43,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-21 22:19:43,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 115 transitions. [2020-07-21 22:19:43,278 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 115 transitions. Word has length 163 [2020-07-21 22:19:43,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:43,279 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 115 transitions. [2020-07-21 22:19:43,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 22:19:43,280 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 115 transitions. [2020-07-21 22:19:43,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-07-21 22:19:43,284 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:43,284 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 8, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:43,498 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:43,499 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:43,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:43,499 INFO L82 PathProgramCache]: Analyzing trace with hash -2102107778, now seen corresponding path program 4 times [2020-07-21 22:19:43,500 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:43,500 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [525298930] [2020-07-21 22:19:43,500 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:43,637 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:19:43,637 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:43,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:19:43,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:43,705 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 79 proven. 76 refuted. 0 times theorem prover too weak. 282 trivial. 0 not checked. [2020-07-21 22:19:43,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:44,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:44,266 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:44,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:44,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:44,382 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:44,448 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 79 proven. 81 refuted. 0 times theorem prover too weak. 277 trivial. 0 not checked. [2020-07-21 22:19:44,448 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [525298930] [2020-07-21 22:19:44,448 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:44,449 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 22:19:44,449 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373274204] [2020-07-21 22:19:44,449 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:19:44,450 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:44,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:19:44,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:19:44,450 INFO L87 Difference]: Start difference. First operand 75 states and 115 transitions. Second operand 13 states. [2020-07-21 22:19:44,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:44,646 INFO L93 Difference]: Finished difference Result 107 states and 179 transitions. [2020-07-21 22:19:44,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:19:44,646 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 136 [2020-07-21 22:19:44,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:44,648 INFO L225 Difference]: With dead ends: 107 [2020-07-21 22:19:44,649 INFO L226 Difference]: Without dead ends: 100 [2020-07-21 22:19:44,650 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 251 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:19:44,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-07-21 22:19:44,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 82. [2020-07-21 22:19:44,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-07-21 22:19:44,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 136 transitions. [2020-07-21 22:19:44,664 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 136 transitions. Word has length 136 [2020-07-21 22:19:44,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:44,664 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 136 transitions. [2020-07-21 22:19:44,664 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:19:44,665 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 136 transitions. [2020-07-21 22:19:44,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2020-07-21 22:19:44,669 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:44,669 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 8, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:44,882 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:44,883 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:44,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:44,883 INFO L82 PathProgramCache]: Analyzing trace with hash -1316077641, now seen corresponding path program 5 times [2020-07-21 22:19:44,883 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:44,884 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1331382381] [2020-07-21 22:19:44,884 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:45,006 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:19:45,006 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:45,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:19:45,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:45,093 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 106 proven. 98 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2020-07-21 22:19:45,094 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:45,762 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:45,901 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:45,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:46,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:46,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:46,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:46,170 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 108 proven. 104 refuted. 0 times theorem prover too weak. 317 trivial. 0 not checked. [2020-07-21 22:19:46,170 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1331382381] [2020-07-21 22:19:46,170 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:46,170 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 22:19:46,170 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [557413969] [2020-07-21 22:19:46,171 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 22:19:46,171 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:46,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 22:19:46,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:19:46,172 INFO L87 Difference]: Start difference. First operand 82 states and 136 transitions. Second operand 15 states. [2020-07-21 22:19:46,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:46,413 INFO L93 Difference]: Finished difference Result 117 states and 203 transitions. [2020-07-21 22:19:46,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:19:46,414 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 148 [2020-07-21 22:19:46,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:46,417 INFO L225 Difference]: With dead ends: 117 [2020-07-21 22:19:46,417 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 22:19:46,418 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 271 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 22:19:46,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 22:19:46,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 80. [2020-07-21 22:19:46,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-21 22:19:46,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 128 transitions. [2020-07-21 22:19:46,428 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 128 transitions. Word has length 148 [2020-07-21 22:19:46,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:46,428 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 128 transitions. [2020-07-21 22:19:46,429 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 22:19:46,429 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 128 transitions. [2020-07-21 22:19:46,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2020-07-21 22:19:46,431 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:46,431 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 9, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:46,639 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:46,640 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:46,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:46,641 INFO L82 PathProgramCache]: Analyzing trace with hash -872965087, now seen corresponding path program 6 times [2020-07-21 22:19:46,641 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:46,641 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1469194103] [2020-07-21 22:19:46,642 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:46,769 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:19:46,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:46,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:19:46,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:46,834 INFO L134 CoverageAnalysis]: Checked inductivity of 537 backedges. 88 proven. 81 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-21 22:19:46,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:47,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:47,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:47,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:47,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:47,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:47,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:47,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:47,638 INFO L134 CoverageAnalysis]: Checked inductivity of 537 backedges. 88 proven. 85 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 22:19:47,638 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1469194103] [2020-07-21 22:19:47,639 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:47,639 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 22:19:47,639 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [102231292] [2020-07-21 22:19:47,641 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:19:47,642 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:47,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:19:47,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:19:47,642 INFO L87 Difference]: Start difference. First operand 80 states and 128 transitions. Second operand 13 states. [2020-07-21 22:19:47,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:47,819 INFO L93 Difference]: Finished difference Result 114 states and 190 transitions. [2020-07-21 22:19:47,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:19:47,820 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 149 [2020-07-21 22:19:47,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:47,823 INFO L225 Difference]: With dead ends: 114 [2020-07-21 22:19:47,823 INFO L226 Difference]: Without dead ends: 107 [2020-07-21 22:19:47,824 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 277 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:19:47,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-21 22:19:47,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 80. [2020-07-21 22:19:47,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-21 22:19:47,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 128 transitions. [2020-07-21 22:19:47,835 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 128 transitions. Word has length 149 [2020-07-21 22:19:47,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:47,836 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 128 transitions. [2020-07-21 22:19:47,836 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:19:47,837 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 128 transitions. [2020-07-21 22:19:47,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2020-07-21 22:19:47,838 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:47,839 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 9, 8, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:48,053 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:48,054 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:48,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:48,054 INFO L82 PathProgramCache]: Analyzing trace with hash -529934979, now seen corresponding path program 7 times [2020-07-21 22:19:48,055 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:48,055 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [90192099] [2020-07-21 22:19:48,055 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:48,207 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:19:48,207 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:48,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:19:48,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:48,282 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 141 proven. 34 refuted. 0 times theorem prover too weak. 369 trivial. 0 not checked. [2020-07-21 22:19:48,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:48,733 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:48,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:48,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:48,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:48,960 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:49,079 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 143 proven. 37 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 22:19:49,079 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [90192099] [2020-07-21 22:19:49,080 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:49,080 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 22:19:49,080 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1651237488] [2020-07-21 22:19:49,080 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:19:49,081 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:49,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:19:49,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:19:49,081 INFO L87 Difference]: Start difference. First operand 80 states and 128 transitions. Second operand 13 states. [2020-07-21 22:19:49,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:49,249 INFO L93 Difference]: Finished difference Result 106 states and 183 transitions. [2020-07-21 22:19:49,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:19:49,250 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 150 [2020-07-21 22:19:49,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:49,252 INFO L225 Difference]: With dead ends: 106 [2020-07-21 22:19:49,252 INFO L226 Difference]: Without dead ends: 99 [2020-07-21 22:19:49,253 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 279 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:19:49,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-07-21 22:19:49,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 92. [2020-07-21 22:19:49,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-07-21 22:19:49,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 161 transitions. [2020-07-21 22:19:49,266 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 161 transitions. Word has length 150 [2020-07-21 22:19:49,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:49,266 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 161 transitions. [2020-07-21 22:19:49,267 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:19:49,267 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 161 transitions. [2020-07-21 22:19:49,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2020-07-21 22:19:49,269 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:49,269 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 10, 10, 9, 8, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:49,483 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:49,483 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:49,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:49,484 INFO L82 PathProgramCache]: Analyzing trace with hash 1102006884, now seen corresponding path program 8 times [2020-07-21 22:19:49,484 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:49,485 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1980660899] [2020-07-21 22:19:49,485 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:49,648 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:19:49,648 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:49,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 361 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:19:49,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:49,748 INFO L134 CoverageAnalysis]: Checked inductivity of 656 backedges. 185 proven. 49 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-21 22:19:49,749 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:50,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:50,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:50,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:50,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:50,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:50,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:50,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:50,825 INFO L134 CoverageAnalysis]: Checked inductivity of 656 backedges. 187 proven. 55 refuted. 0 times theorem prover too weak. 414 trivial. 0 not checked. [2020-07-21 22:19:50,826 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1980660899] [2020-07-21 22:19:50,826 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:50,826 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 22:19:50,826 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127498003] [2020-07-21 22:19:50,828 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 22:19:50,828 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:50,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 22:19:50,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:19:50,829 INFO L87 Difference]: Start difference. First operand 92 states and 161 transitions. Second operand 15 states. [2020-07-21 22:19:51,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:51,034 INFO L93 Difference]: Finished difference Result 117 states and 207 transitions. [2020-07-21 22:19:51,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:19:51,035 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 162 [2020-07-21 22:19:51,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:51,038 INFO L225 Difference]: With dead ends: 117 [2020-07-21 22:19:51,038 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 22:19:51,039 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 299 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 22:19:51,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 22:19:51,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 96. [2020-07-21 22:19:51,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-07-21 22:19:51,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 158 transitions. [2020-07-21 22:19:51,049 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 158 transitions. Word has length 162 [2020-07-21 22:19:51,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:51,050 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 158 transitions. [2020-07-21 22:19:51,050 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 22:19:51,050 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 158 transitions. [2020-07-21 22:19:51,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2020-07-21 22:19:51,052 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:51,053 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 10, 10, 10, 8, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:51,265 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:51,266 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:51,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:51,266 INFO L82 PathProgramCache]: Analyzing trace with hash 1920867700, now seen corresponding path program 9 times [2020-07-21 22:19:51,267 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:51,267 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1260355530] [2020-07-21 22:19:51,267 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:51,444 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:19:51,444 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:51,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:19:51,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:51,510 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 149 proven. 37 refuted. 0 times theorem prover too weak. 479 trivial. 0 not checked. [2020-07-21 22:19:51,510 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:51,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:51,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:51,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:52,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:52,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:52,079 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:52,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:52,276 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 149 proven. 43 refuted. 0 times theorem prover too weak. 473 trivial. 0 not checked. [2020-07-21 22:19:52,277 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1260355530] [2020-07-21 22:19:52,277 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:52,277 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 22:19:52,277 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602518186] [2020-07-21 22:19:52,278 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:19:52,278 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:52,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:19:52,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:19:52,278 INFO L87 Difference]: Start difference. First operand 96 states and 158 transitions. Second operand 13 states. [2020-07-21 22:19:52,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:52,465 INFO L93 Difference]: Finished difference Result 129 states and 217 transitions. [2020-07-21 22:19:52,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:19:52,469 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 163 [2020-07-21 22:19:52,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:52,471 INFO L225 Difference]: With dead ends: 129 [2020-07-21 22:19:52,471 INFO L226 Difference]: Without dead ends: 122 [2020-07-21 22:19:52,472 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 305 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:19:52,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-07-21 22:19:52,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 93. [2020-07-21 22:19:52,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-21 22:19:52,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 149 transitions. [2020-07-21 22:19:52,483 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 149 transitions. Word has length 163 [2020-07-21 22:19:52,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:52,483 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 149 transitions. [2020-07-21 22:19:52,483 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:19:52,484 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 149 transitions. [2020-07-21 22:19:52,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2020-07-21 22:19:52,486 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:52,486 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 10, 10, 10, 9, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:52,700 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:52,701 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:52,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:52,702 INFO L82 PathProgramCache]: Analyzing trace with hash -1607241826, now seen corresponding path program 10 times [2020-07-21 22:19:52,702 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:52,703 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1553125355] [2020-07-21 22:19:52,703 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:52,868 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:19:52,868 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:52,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:19:52,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:52,957 INFO L134 CoverageAnalysis]: Checked inductivity of 673 backedges. 123 proven. 32 refuted. 0 times theorem prover too weak. 518 trivial. 0 not checked. [2020-07-21 22:19:52,957 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:53,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:53,278 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:53,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:53,382 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:53,517 INFO L134 CoverageAnalysis]: Checked inductivity of 673 backedges. 123 proven. 34 refuted. 0 times theorem prover too weak. 516 trivial. 0 not checked. [2020-07-21 22:19:53,517 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1553125355] [2020-07-21 22:19:53,517 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:53,517 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 22:19:53,517 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2029140351] [2020-07-21 22:19:53,518 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 22:19:53,518 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:53,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 22:19:53,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:19:53,518 INFO L87 Difference]: Start difference. First operand 93 states and 149 transitions. Second operand 11 states. [2020-07-21 22:19:53,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:53,655 INFO L93 Difference]: Finished difference Result 131 states and 225 transitions. [2020-07-21 22:19:53,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:19:53,656 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 164 [2020-07-21 22:19:53,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:53,658 INFO L225 Difference]: With dead ends: 131 [2020-07-21 22:19:53,659 INFO L226 Difference]: Without dead ends: 124 [2020-07-21 22:19:53,660 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 311 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:19:53,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-21 22:19:53,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 95. [2020-07-21 22:19:53,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-07-21 22:19:53,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 157 transitions. [2020-07-21 22:19:53,669 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 157 transitions. Word has length 164 [2020-07-21 22:19:53,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:53,670 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 157 transitions. [2020-07-21 22:19:53,670 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 22:19:53,670 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 157 transitions. [2020-07-21 22:19:53,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2020-07-21 22:19:53,672 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:53,673 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 10, 9, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:53,887 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:53,888 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:53,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:53,889 INFO L82 PathProgramCache]: Analyzing trace with hash -315995755, now seen corresponding path program 11 times [2020-07-21 22:19:53,889 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:53,890 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [806481841] [2020-07-21 22:19:53,890 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:54,059 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:19:54,059 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:54,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 392 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:19:54,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:54,130 INFO L134 CoverageAnalysis]: Checked inductivity of 777 backedges. 168 proven. 41 refuted. 0 times theorem prover too weak. 568 trivial. 0 not checked. [2020-07-21 22:19:54,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:54,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:54,642 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:54,696 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:54,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:54,820 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:54,998 INFO L134 CoverageAnalysis]: Checked inductivity of 777 backedges. 170 proven. 43 refuted. 0 times theorem prover too weak. 564 trivial. 0 not checked. [2020-07-21 22:19:54,999 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [806481841] [2020-07-21 22:19:54,999 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:54,999 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 22:19:54,999 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49156665] [2020-07-21 22:19:55,000 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:19:55,000 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:55,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:19:55,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:19:55,002 INFO L87 Difference]: Start difference. First operand 95 states and 157 transitions. Second operand 13 states. [2020-07-21 22:19:55,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:55,188 INFO L93 Difference]: Finished difference Result 110 states and 175 transitions. [2020-07-21 22:19:55,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:19:55,188 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 176 [2020-07-21 22:19:55,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:55,190 INFO L225 Difference]: With dead ends: 110 [2020-07-21 22:19:55,191 INFO L226 Difference]: Without dead ends: 103 [2020-07-21 22:19:55,192 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 331 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:19:55,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-21 22:19:55,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 93. [2020-07-21 22:19:55,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-21 22:19:55,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 149 transitions. [2020-07-21 22:19:55,202 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 149 transitions. Word has length 176 [2020-07-21 22:19:55,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:55,202 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 149 transitions. [2020-07-21 22:19:55,203 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:19:55,203 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 149 transitions. [2020-07-21 22:19:55,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2020-07-21 22:19:55,205 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:55,205 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 11, 11, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:55,418 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:55,419 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:55,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:55,419 INFO L82 PathProgramCache]: Analyzing trace with hash -854759576, now seen corresponding path program 12 times [2020-07-21 22:19:55,419 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:55,419 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2000835347] [2020-07-21 22:19:55,420 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:55,599 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:19:55,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:55,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 425 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:19:55,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:55,692 INFO L134 CoverageAnalysis]: Checked inductivity of 938 backedges. 251 proven. 47 refuted. 0 times theorem prover too weak. 640 trivial. 0 not checked. [2020-07-21 22:19:55,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:56,299 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:56,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:56,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:56,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:56,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:56,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:56,849 INFO L134 CoverageAnalysis]: Checked inductivity of 938 backedges. 251 proven. 55 refuted. 0 times theorem prover too weak. 632 trivial. 0 not checked. [2020-07-21 22:19:56,849 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2000835347] [2020-07-21 22:19:56,850 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:56,850 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 22:19:56,850 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [342682468] [2020-07-21 22:19:56,850 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 22:19:56,851 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:56,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 22:19:56,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:19:56,851 INFO L87 Difference]: Start difference. First operand 93 states and 149 transitions. Second operand 15 states. [2020-07-21 22:19:57,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:57,103 INFO L93 Difference]: Finished difference Result 123 states and 202 transitions. [2020-07-21 22:19:57,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:19:57,104 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 191 [2020-07-21 22:19:57,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:57,106 INFO L225 Difference]: With dead ends: 123 [2020-07-21 22:19:57,107 INFO L226 Difference]: Without dead ends: 116 [2020-07-21 22:19:57,108 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 357 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 22:19:57,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-07-21 22:19:57,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 101. [2020-07-21 22:19:57,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-07-21 22:19:57,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 173 transitions. [2020-07-21 22:19:57,118 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 173 transitions. Word has length 191 [2020-07-21 22:19:57,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:57,119 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 173 transitions. [2020-07-21 22:19:57,119 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 22:19:57,119 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 173 transitions. [2020-07-21 22:19:57,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2020-07-21 22:19:57,122 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:57,122 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 12, 11, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:57,336 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:57,337 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:57,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:57,337 INFO L82 PathProgramCache]: Analyzing trace with hash -31808317, now seen corresponding path program 13 times [2020-07-21 22:19:57,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:57,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2082735412] [2020-07-21 22:19:57,338 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 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:57,517 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:19:57,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:57,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 22:19:57,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:57,625 INFO L134 CoverageAnalysis]: Checked inductivity of 1073 backedges. 270 proven. 102 refuted. 0 times theorem prover too weak. 701 trivial. 0 not checked. [2020-07-21 22:19:57,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:58,565 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:58,566 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:58,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:58,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:59,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:59,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:59,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:59,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:59,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:59,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:59,238 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:59,378 INFO L134 CoverageAnalysis]: Checked inductivity of 1073 backedges. 270 proven. 116 refuted. 0 times theorem prover too weak. 687 trivial. 0 not checked. [2020-07-21 22:19:59,379 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2082735412] [2020-07-21 22:19:59,379 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:59,379 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 22:19:59,379 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618909038] [2020-07-21 22:19:59,380 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 22:19:59,380 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:59,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 22:19:59,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:19:59,380 INFO L87 Difference]: Start difference. First operand 101 states and 173 transitions. Second operand 17 states. [2020-07-21 22:19:59,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:59,670 INFO L93 Difference]: Finished difference Result 121 states and 205 transitions. [2020-07-21 22:19:59,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:19:59,671 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 204 [2020-07-21 22:19:59,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:59,674 INFO L225 Difference]: With dead ends: 121 [2020-07-21 22:19:59,674 INFO L226 Difference]: Without dead ends: 114 [2020-07-21 22:19:59,675 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 413 GetRequests, 379 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 22:19:59,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-07-21 22:19:59,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 93. [2020-07-21 22:19:59,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-21 22:19:59,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 161 transitions. [2020-07-21 22:19:59,685 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 161 transitions. Word has length 204 [2020-07-21 22:19:59,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:59,685 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 161 transitions. [2020-07-21 22:19:59,685 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 22:19:59,685 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 161 transitions. [2020-07-21 22:19:59,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2020-07-21 22:19:59,688 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:59,688 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 10, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:59,901 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:59,902 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:59,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:59,903 INFO L82 PathProgramCache]: Analyzing trace with hash 307857833, now seen corresponding path program 14 times [2020-07-21 22:19:59,903 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:59,903 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1536470700] [2020-07-21 22:19:59,903 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 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:00,099 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:20:00,099 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:00,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 103 conjunts are in the unsatisfiable core [2020-07-21 22:20:00,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:00,571 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 0 proven. 267 refuted. 0 times theorem prover too weak. 519 trivial. 0 not checked. [2020-07-21 22:20:00,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:02,560 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 0 proven. 267 refuted. 0 times theorem prover too weak. 519 trivial. 0 not checked. [2020-07-21 22:20:02,560 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1536470700] [2020-07-21 22:20:02,560 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:02,560 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 36 [2020-07-21 22:20:02,561 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398207844] [2020-07-21 22:20:02,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 22:20:02,561 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:02,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 22:20:02,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1175, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 22:20:02,562 INFO L87 Difference]: Start difference. First operand 93 states and 161 transitions. Second operand 36 states. [2020-07-21 22:20:03,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:03,516 INFO L93 Difference]: Finished difference Result 226 states and 521 transitions. [2020-07-21 22:20:03,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 22:20:03,517 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 177 [2020-07-21 22:20:03,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:03,528 INFO L225 Difference]: With dead ends: 226 [2020-07-21 22:20:03,528 INFO L226 Difference]: Without dead ends: 219 [2020-07-21 22:20:03,532 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 319 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=109, Invalid=1613, Unknown=0, NotChecked=0, Total=1722 [2020-07-21 22:20:03,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2020-07-21 22:20:03,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 145. [2020-07-21 22:20:03,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 145 states. [2020-07-21 22:20:03,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 323 transitions. [2020-07-21 22:20:03,589 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 323 transitions. Word has length 177 [2020-07-21 22:20:03,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:03,590 INFO L479 AbstractCegarLoop]: Abstraction has 145 states and 323 transitions. [2020-07-21 22:20:03,590 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 22:20:03,590 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 323 transitions. [2020-07-21 22:20:03,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2020-07-21 22:20:03,595 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:03,595 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 11, 11, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:03,808 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:03,809 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:03,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:03,809 INFO L82 PathProgramCache]: Analyzing trace with hash -1104223868, now seen corresponding path program 15 times [2020-07-21 22:20:03,810 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:03,810 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1936057701] [2020-07-21 22:20:03,810 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 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:04,005 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:20:04,006 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:04,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 22:20:04,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:04,128 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 104 proven. 204 refuted. 0 times theorem prover too weak. 622 trivial. 0 not checked. [2020-07-21 22:20:04,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:05,073 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:05,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:05,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:05,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:05,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:05,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:05,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:05,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:05,661 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 104 proven. 212 refuted. 0 times theorem prover too weak. 614 trivial. 0 not checked. [2020-07-21 22:20:05,661 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1936057701] [2020-07-21 22:20:05,661 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:05,662 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 17 [2020-07-21 22:20:05,662 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054197699] [2020-07-21 22:20:05,662 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 22:20:05,662 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:05,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 22:20:05,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:20:05,663 INFO L87 Difference]: Start difference. First operand 145 states and 323 transitions. Second operand 17 states. [2020-07-21 22:20:06,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:06,042 INFO L93 Difference]: Finished difference Result 199 states and 481 transitions. [2020-07-21 22:20:06,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:20:06,043 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 191 [2020-07-21 22:20:06,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:06,047 INFO L225 Difference]: With dead ends: 199 [2020-07-21 22:20:06,047 INFO L226 Difference]: Without dead ends: 145 [2020-07-21 22:20:06,050 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 355 SyntacticMatches, 11 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=105, Invalid=357, Unknown=0, NotChecked=0, Total=462 [2020-07-21 22:20:06,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2020-07-21 22:20:06,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 145. [2020-07-21 22:20:06,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 145 states. [2020-07-21 22:20:06,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 299 transitions. [2020-07-21 22:20:06,068 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 299 transitions. Word has length 191 [2020-07-21 22:20:06,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:06,069 INFO L479 AbstractCegarLoop]: Abstraction has 145 states and 299 transitions. [2020-07-21 22:20:06,069 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 22:20:06,069 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 299 transitions. [2020-07-21 22:20:06,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2020-07-21 22:20:06,073 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:06,073 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 11, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:06,288 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:06,288 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:06,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:06,289 INFO L82 PathProgramCache]: Analyzing trace with hash -916523095, now seen corresponding path program 16 times [2020-07-21 22:20:06,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:06,289 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [606322099] [2020-07-21 22:20:06,290 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 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:06,475 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:20:06,475 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:06,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:20:06,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:06,551 INFO L134 CoverageAnalysis]: Checked inductivity of 796 backedges. 131 proven. 137 refuted. 0 times theorem prover too weak. 528 trivial. 0 not checked. [2020-07-21 22:20:06,551 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:07,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:07,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:07,471 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:07,565 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:07,565 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:07,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:07,643 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:07,686 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:07,760 INFO L134 CoverageAnalysis]: Checked inductivity of 796 backedges. 131 proven. 147 refuted. 0 times theorem prover too weak. 518 trivial. 0 not checked. [2020-07-21 22:20:07,761 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [606322099] [2020-07-21 22:20:07,761 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:07,761 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 22:20:07,761 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1277281502] [2020-07-21 22:20:07,761 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 22:20:07,761 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:07,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 22:20:07,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:20:07,762 INFO L87 Difference]: Start difference. First operand 145 states and 299 transitions. Second operand 15 states. [2020-07-21 22:20:08,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:08,070 INFO L93 Difference]: Finished difference Result 200 states and 443 transitions. [2020-07-21 22:20:08,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:20:08,071 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 178 [2020-07-21 22:20:08,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:08,074 INFO L225 Difference]: With dead ends: 200 [2020-07-21 22:20:08,074 INFO L226 Difference]: Without dead ends: 168 [2020-07-21 22:20:08,077 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 331 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 22:20:08,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-07-21 22:20:08,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 148. [2020-07-21 22:20:08,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2020-07-21 22:20:08,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 302 transitions. [2020-07-21 22:20:08,097 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 302 transitions. Word has length 178 [2020-07-21 22:20:08,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:08,097 INFO L479 AbstractCegarLoop]: Abstraction has 148 states and 302 transitions. [2020-07-21 22:20:08,097 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 22:20:08,097 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 302 transitions. [2020-07-21 22:20:08,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 22:20:08,102 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:08,102 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 11, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:08,315 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:08,316 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:08,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:08,316 INFO L82 PathProgramCache]: Analyzing trace with hash 128823812, now seen corresponding path program 17 times [2020-07-21 22:20:08,316 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:08,316 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1511517796] [2020-07-21 22:20:08,317 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:08,517 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:20:08,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:08,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 22:20:08,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:08,608 INFO L134 CoverageAnalysis]: Checked inductivity of 920 backedges. 151 proven. 154 refuted. 0 times theorem prover too weak. 615 trivial. 0 not checked. [2020-07-21 22:20:08,608 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:09,471 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:09,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:09,686 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:09,844 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:09,844 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:09,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:10,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:10,124 INFO L134 CoverageAnalysis]: Checked inductivity of 920 backedges. 149 proven. 164 refuted. 0 times theorem prover too weak. 607 trivial. 0 not checked. [2020-07-21 22:20:10,124 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1511517796] [2020-07-21 22:20:10,124 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:10,125 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 17 [2020-07-21 22:20:10,125 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865172854] [2020-07-21 22:20:10,125 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 22:20:10,126 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:10,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 22:20:10,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:20:10,126 INFO L87 Difference]: Start difference. First operand 148 states and 302 transitions. Second operand 17 states. [2020-07-21 22:20:10,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:10,521 INFO L93 Difference]: Finished difference Result 186 states and 397 transitions. [2020-07-21 22:20:10,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:20:10,522 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 190 [2020-07-21 22:20:10,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:10,526 INFO L225 Difference]: With dead ends: 186 [2020-07-21 22:20:10,527 INFO L226 Difference]: Without dead ends: 154 [2020-07-21 22:20:10,530 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 353 SyntacticMatches, 11 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=105, Invalid=357, Unknown=0, NotChecked=0, Total=462 [2020-07-21 22:20:10,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2020-07-21 22:20:10,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 143. [2020-07-21 22:20:10,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2020-07-21 22:20:10,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 293 transitions. [2020-07-21 22:20:10,549 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 293 transitions. Word has length 190 [2020-07-21 22:20:10,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:10,549 INFO L479 AbstractCegarLoop]: Abstraction has 143 states and 293 transitions. [2020-07-21 22:20:10,549 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 22:20:10,549 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 293 transitions. [2020-07-21 22:20:10,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 22:20:10,553 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:10,553 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 11, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:10,766 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:10,767 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:10,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:10,767 INFO L82 PathProgramCache]: Analyzing trace with hash 507100052, now seen corresponding path program 18 times [2020-07-21 22:20:10,768 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:10,768 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [147561794] [2020-07-21 22:20:10,768 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 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:11,003 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:20:11,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:11,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 22:20:11,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:11,107 INFO L134 CoverageAnalysis]: Checked inductivity of 928 backedges. 124 proven. 132 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2020-07-21 22:20:11,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:11,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:11,867 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:11,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:11,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:11,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:12,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:12,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:12,119 INFO L134 CoverageAnalysis]: Checked inductivity of 928 backedges. 125 proven. 135 refuted. 0 times theorem prover too weak. 668 trivial. 0 not checked. [2020-07-21 22:20:12,119 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [147561794] [2020-07-21 22:20:12,120 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:12,120 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 15 [2020-07-21 22:20:12,120 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698566091] [2020-07-21 22:20:12,120 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 22:20:12,120 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:12,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 22:20:12,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:20:12,121 INFO L87 Difference]: Start difference. First operand 143 states and 293 transitions. Second operand 15 states. [2020-07-21 22:20:12,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:12,415 INFO L93 Difference]: Finished difference Result 198 states and 426 transitions. [2020-07-21 22:20:12,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:20:12,416 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 22:20:12,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:12,419 INFO L225 Difference]: With dead ends: 198 [2020-07-21 22:20:12,419 INFO L226 Difference]: Without dead ends: 158 [2020-07-21 22:20:12,422 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 357 SyntacticMatches, 9 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=78, Invalid=264, Unknown=0, NotChecked=0, Total=342 [2020-07-21 22:20:12,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2020-07-21 22:20:12,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 143. [2020-07-21 22:20:12,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2020-07-21 22:20:12,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 273 transitions. [2020-07-21 22:20:12,438 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 273 transitions. Word has length 190 [2020-07-21 22:20:12,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:12,439 INFO L479 AbstractCegarLoop]: Abstraction has 143 states and 273 transitions. [2020-07-21 22:20:12,439 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 22:20:12,439 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 273 transitions. [2020-07-21 22:20:12,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2020-07-21 22:20:12,443 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:12,443 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 11, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:12,659 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:12,660 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:12,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:12,660 INFO L82 PathProgramCache]: Analyzing trace with hash -712647889, now seen corresponding path program 19 times [2020-07-21 22:20:12,661 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:12,661 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [598885073] [2020-07-21 22:20:12,661 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 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:12,849 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:20:12,849 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:12,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:20:12,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:12,996 INFO L134 CoverageAnalysis]: Checked inductivity of 796 backedges. 210 proven. 60 refuted. 0 times theorem prover too weak. 526 trivial. 0 not checked. [2020-07-21 22:20:12,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:13,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:13,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:13,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:13,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:13,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:13,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:14,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:14,186 INFO L134 CoverageAnalysis]: Checked inductivity of 796 backedges. 212 proven. 66 refuted. 0 times theorem prover too weak. 518 trivial. 0 not checked. [2020-07-21 22:20:14,187 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [598885073] [2020-07-21 22:20:14,187 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:14,187 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 22:20:14,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1793121666] [2020-07-21 22:20:14,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 22:20:14,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:14,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 22:20:14,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:20:14,188 INFO L87 Difference]: Start difference. First operand 143 states and 273 transitions. Second operand 15 states. [2020-07-21 22:20:14,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:14,440 INFO L93 Difference]: Finished difference Result 179 states and 334 transitions. [2020-07-21 22:20:14,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:20:14,441 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 178 [2020-07-21 22:20:14,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:14,443 INFO L225 Difference]: With dead ends: 179 [2020-07-21 22:20:14,443 INFO L226 Difference]: Without dead ends: 172 [2020-07-21 22:20:14,445 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 331 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 22:20:14,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2020-07-21 22:20:14,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 143. [2020-07-21 22:20:14,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2020-07-21 22:20:14,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 273 transitions. [2020-07-21 22:20:14,463 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 273 transitions. Word has length 178 [2020-07-21 22:20:14,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:14,464 INFO L479 AbstractCegarLoop]: Abstraction has 143 states and 273 transitions. [2020-07-21 22:20:14,464 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 22:20:14,464 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 273 transitions. [2020-07-21 22:20:14,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 22:20:14,467 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:14,468 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 11, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:14,681 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:14,682 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:14,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:14,682 INFO L82 PathProgramCache]: Analyzing trace with hash -617477230, now seen corresponding path program 20 times [2020-07-21 22:20:14,682 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:14,683 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1800644615] [2020-07-21 22:20:14,683 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:14,900 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:20:14,900 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:14,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 22:20:14,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:15,011 INFO L134 CoverageAnalysis]: Checked inductivity of 920 backedges. 234 proven. 71 refuted. 0 times theorem prover too weak. 615 trivial. 0 not checked. [2020-07-21 22:20:15,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:15,800 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:15,801 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:16,011 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:16,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:16,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:16,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:16,206 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:16,315 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:16,459 INFO L134 CoverageAnalysis]: Checked inductivity of 920 backedges. 232 proven. 81 refuted. 0 times theorem prover too weak. 607 trivial. 0 not checked. [2020-07-21 22:20:16,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1800644615] [2020-07-21 22:20:16,460 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:16,460 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 17 [2020-07-21 22:20:16,460 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077359545] [2020-07-21 22:20:16,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 22:20:16,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:16,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 22:20:16,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:20:16,462 INFO L87 Difference]: Start difference. First operand 143 states and 273 transitions. Second operand 17 states. [2020-07-21 22:20:16,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:16,811 INFO L93 Difference]: Finished difference Result 177 states and 332 transitions. [2020-07-21 22:20:16,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:20:16,811 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 190 [2020-07-21 22:20:16,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:16,813 INFO L225 Difference]: With dead ends: 177 [2020-07-21 22:20:16,813 INFO L226 Difference]: Without dead ends: 170 [2020-07-21 22:20:16,815 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 353 SyntacticMatches, 11 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=105, Invalid=357, Unknown=0, NotChecked=0, Total=462 [2020-07-21 22:20:16,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2020-07-21 22:20:16,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 133. [2020-07-21 22:20:16,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-07-21 22:20:16,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 242 transitions. [2020-07-21 22:20:16,832 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 242 transitions. Word has length 190 [2020-07-21 22:20:16,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:16,832 INFO L479 AbstractCegarLoop]: Abstraction has 133 states and 242 transitions. [2020-07-21 22:20:16,832 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 22:20:16,832 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 242 transitions. [2020-07-21 22:20:16,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2020-07-21 22:20:16,836 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:16,836 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 11, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:17,049 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:17,050 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:17,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:17,051 INFO L82 PathProgramCache]: Analyzing trace with hash 1843327003, now seen corresponding path program 21 times [2020-07-21 22:20:17,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:17,051 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1683992624] [2020-07-21 22:20:17,052 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 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:17,275 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:20:17,276 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:17,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 396 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:20:17,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:17,347 INFO L134 CoverageAnalysis]: Checked inductivity of 796 backedges. 185 proven. 33 refuted. 0 times theorem prover too weak. 578 trivial. 0 not checked. [2020-07-21 22:20:17,347 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:17,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:17,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:17,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:17,883 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:17,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:17,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:17,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:18,007 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:18,088 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:18,236 INFO L134 CoverageAnalysis]: Checked inductivity of 796 backedges. 185 proven. 39 refuted. 0 times theorem prover too weak. 572 trivial. 0 not checked. [2020-07-21 22:20:18,236 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1683992624] [2020-07-21 22:20:18,236 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:18,236 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 22:20:18,237 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958944390] [2020-07-21 22:20:18,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:20:18,237 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:18,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:20:18,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:20:18,237 INFO L87 Difference]: Start difference. First operand 133 states and 242 transitions. Second operand 13 states. [2020-07-21 22:20:18,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:18,411 INFO L93 Difference]: Finished difference Result 162 states and 298 transitions. [2020-07-21 22:20:18,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:20:18,411 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 178 [2020-07-21 22:20:18,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:18,413 INFO L225 Difference]: With dead ends: 162 [2020-07-21 22:20:18,413 INFO L226 Difference]: Without dead ends: 155 [2020-07-21 22:20:18,415 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 335 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:20:18,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2020-07-21 22:20:18,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 136. [2020-07-21 22:20:18,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-07-21 22:20:18,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 254 transitions. [2020-07-21 22:20:18,428 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 254 transitions. Word has length 178 [2020-07-21 22:20:18,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:18,429 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 254 transitions. [2020-07-21 22:20:18,429 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:20:18,429 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 254 transitions. [2020-07-21 22:20:18,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-21 22:20:18,432 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:18,432 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 10, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:18,645 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:18,646 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:18,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:18,647 INFO L82 PathProgramCache]: Analyzing trace with hash -140375518, now seen corresponding path program 22 times [2020-07-21 22:20:18,647 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:18,647 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2065797659] [2020-07-21 22:20:18,647 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 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:18,889 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:20:18,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:18,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 421 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 22:20:18,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:18,975 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 211 proven. 43 refuted. 0 times theorem prover too weak. 664 trivial. 0 not checked. [2020-07-21 22:20:18,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:19,521 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:19,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:19,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:19,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:19,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:19,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:20,044 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 210 proven. 48 refuted. 0 times theorem prover too weak. 660 trivial. 0 not checked. [2020-07-21 22:20:20,045 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2065797659] [2020-07-21 22:20:20,045 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:20,045 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 15 [2020-07-21 22:20:20,045 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1185003288] [2020-07-21 22:20:20,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 22:20:20,046 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:20,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 22:20:20,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:20:20,046 INFO L87 Difference]: Start difference. First operand 136 states and 254 transitions. Second operand 15 states. [2020-07-21 22:20:20,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:20,291 INFO L93 Difference]: Finished difference Result 158 states and 286 transitions. [2020-07-21 22:20:20,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:20:20,292 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 189 [2020-07-21 22:20:20,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:20,294 INFO L225 Difference]: With dead ends: 158 [2020-07-21 22:20:20,294 INFO L226 Difference]: Without dead ends: 151 [2020-07-21 22:20:20,295 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 355 SyntacticMatches, 9 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=78, Invalid=264, Unknown=0, NotChecked=0, Total=342 [2020-07-21 22:20:20,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2020-07-21 22:20:20,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 133. [2020-07-21 22:20:20,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-07-21 22:20:20,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 242 transitions. [2020-07-21 22:20:20,335 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 242 transitions. Word has length 189 [2020-07-21 22:20:20,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:20,336 INFO L479 AbstractCegarLoop]: Abstraction has 133 states and 242 transitions. [2020-07-21 22:20:20,336 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 22:20:20,336 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 242 transitions. [2020-07-21 22:20:20,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-21 22:20:20,339 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:20,339 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 10, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:20,551 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:20,552 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:20,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:20,552 INFO L82 PathProgramCache]: Analyzing trace with hash 1838391522, now seen corresponding path program 23 times [2020-07-21 22:20:20,552 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:20,552 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1144708905] [2020-07-21 22:20:20,553 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 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:20,768 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:20:20,768 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:20,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 22:20:20,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:20,847 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 198 proven. 54 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2020-07-21 22:20:20,847 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:21,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:21,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:21,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:21,558 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:21,626 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:21,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:21,831 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 197 proven. 61 refuted. 0 times theorem prover too weak. 660 trivial. 0 not checked. [2020-07-21 22:20:21,832 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1144708905] [2020-07-21 22:20:21,832 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:21,832 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 15 [2020-07-21 22:20:21,832 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451704815] [2020-07-21 22:20:21,833 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 22:20:21,833 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:21,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 22:20:21,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:20:21,833 INFO L87 Difference]: Start difference. First operand 133 states and 242 transitions. Second operand 15 states. [2020-07-21 22:20:22,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:22,118 INFO L93 Difference]: Finished difference Result 162 states and 300 transitions. [2020-07-21 22:20:22,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:20:22,118 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 189 [2020-07-21 22:20:22,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:22,121 INFO L225 Difference]: With dead ends: 162 [2020-07-21 22:20:22,122 INFO L226 Difference]: Without dead ends: 155 [2020-07-21 22:20:22,123 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 355 SyntacticMatches, 9 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=78, Invalid=264, Unknown=0, NotChecked=0, Total=342 [2020-07-21 22:20:22,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2020-07-21 22:20:22,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 107. [2020-07-21 22:20:22,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-21 22:20:22,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 192 transitions. [2020-07-21 22:20:22,135 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 192 transitions. Word has length 189 [2020-07-21 22:20:22,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:22,135 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 192 transitions. [2020-07-21 22:20:22,135 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 22:20:22,135 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 192 transitions. [2020-07-21 22:20:22,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2020-07-21 22:20:22,137 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:22,138 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 11, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:22,351 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:22,352 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:22,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:22,352 INFO L82 PathProgramCache]: Analyzing trace with hash -2096855727, now seen corresponding path program 24 times [2020-07-21 22:20:22,352 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:22,352 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [202143323] [2020-07-21 22:20:22,352 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 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:22,551 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:20:22,552 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:22,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 22:20:22,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:22,694 INFO L134 CoverageAnalysis]: Checked inductivity of 796 backedges. 69 proven. 241 refuted. 0 times theorem prover too weak. 486 trivial. 0 not checked. [2020-07-21 22:20:22,695 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:23,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:23,820 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:24,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:24,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:24,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:24,299 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:24,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:24,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:24,453 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:24,453 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:24,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:24,520 INFO L134 CoverageAnalysis]: Checked inductivity of 796 backedges. 73 proven. 251 refuted. 0 times theorem prover too weak. 472 trivial. 0 not checked. [2020-07-21 22:20:24,520 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [202143323] [2020-07-21 22:20:24,520 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:24,520 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 22:20:24,521 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1028967906] [2020-07-21 22:20:24,521 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 22:20:24,521 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:24,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 22:20:24,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:20:24,522 INFO L87 Difference]: Start difference. First operand 107 states and 192 transitions. Second operand 17 states. [2020-07-21 22:20:24,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:24,907 INFO L93 Difference]: Finished difference Result 168 states and 323 transitions. [2020-07-21 22:20:24,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:20:24,908 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 178 [2020-07-21 22:20:24,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:24,910 INFO L225 Difference]: With dead ends: 168 [2020-07-21 22:20:24,910 INFO L226 Difference]: Without dead ends: 104 [2020-07-21 22:20:24,912 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 327 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 22:20:24,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-07-21 22:20:24,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2020-07-21 22:20:24,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2020-07-21 22:20:24,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 148 transitions. [2020-07-21 22:20:24,921 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 148 transitions. Word has length 178 [2020-07-21 22:20:24,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:24,921 INFO L479 AbstractCegarLoop]: Abstraction has 104 states and 148 transitions. [2020-07-21 22:20:24,921 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 22:20:24,921 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 148 transitions. [2020-07-21 22:20:24,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-21 22:20:24,923 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:24,924 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 10, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:25,136 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:25,137 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:25,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:25,137 INFO L82 PathProgramCache]: Analyzing trace with hash 1148569106, now seen corresponding path program 25 times [2020-07-21 22:20:25,138 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:25,138 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1937558804] [2020-07-21 22:20:25,138 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 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:25,369 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:20:25,369 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:25,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 22:20:25,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:25,488 INFO L134 CoverageAnalysis]: Checked inductivity of 910 backedges. 91 proven. 212 refuted. 0 times theorem prover too weak. 607 trivial. 0 not checked. [2020-07-21 22:20:25,488 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:26,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:26,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:26,870 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:26,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:26,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:26,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:27,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:27,082 INFO L134 CoverageAnalysis]: Checked inductivity of 910 backedges. 91 proven. 220 refuted. 0 times theorem prover too weak. 599 trivial. 0 not checked. [2020-07-21 22:20:27,082 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1937558804] [2020-07-21 22:20:27,082 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:27,082 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 17 [2020-07-21 22:20:27,082 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077527532] [2020-07-21 22:20:27,083 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 22:20:27,083 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:27,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 22:20:27,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:20:27,084 INFO L87 Difference]: Start difference. First operand 104 states and 148 transitions. Second operand 17 states. [2020-07-21 22:20:27,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:27,459 INFO L93 Difference]: Finished difference Result 152 states and 209 transitions. [2020-07-21 22:20:27,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:20:27,461 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 189 [2020-07-21 22:20:27,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:27,463 INFO L225 Difference]: With dead ends: 152 [2020-07-21 22:20:27,463 INFO L226 Difference]: Without dead ends: 104 [2020-07-21 22:20:27,465 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 351 SyntacticMatches, 11 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=105, Invalid=357, Unknown=0, NotChecked=0, Total=462 [2020-07-21 22:20:27,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-07-21 22:20:27,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 91. [2020-07-21 22:20:27,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-07-21 22:20:27,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 112 transitions. [2020-07-21 22:20:27,477 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 112 transitions. Word has length 189 [2020-07-21 22:20:27,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:27,477 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 112 transitions. [2020-07-21 22:20:27,477 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 22:20:27,477 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 112 transitions. [2020-07-21 22:20:27,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-21 22:20:27,479 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:27,480 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 10, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:27,692 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:27,693 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:27,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:27,693 INFO L82 PathProgramCache]: Analyzing trace with hash 1803358882, now seen corresponding path program 26 times [2020-07-21 22:20:27,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:27,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [817171321] [2020-07-21 22:20:27,694 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 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:27,961 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:20:27,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:27,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 22:20:27,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:28,090 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 89 proven. 260 refuted. 0 times theorem prover too weak. 569 trivial. 0 not checked. [2020-07-21 22:20:28,090 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:29,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:29,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:29,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:29,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:30,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:30,026 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:30,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:30,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:30,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:30,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:30,336 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 87 proven. 276 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2020-07-21 22:20:30,336 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [817171321] [2020-07-21 22:20:30,336 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:30,336 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16] total 19 [2020-07-21 22:20:30,336 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [318802580] [2020-07-21 22:20:30,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 22:20:30,337 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:30,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 22:20:30,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2020-07-21 22:20:30,338 INFO L87 Difference]: Start difference. First operand 91 states and 112 transitions. Second operand 19 states. [2020-07-21 22:20:30,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:30,801 INFO L93 Difference]: Finished difference Result 137 states and 170 transitions. [2020-07-21 22:20:30,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 22:20:30,803 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 189 [2020-07-21 22:20:30,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:30,804 INFO L225 Difference]: With dead ends: 137 [2020-07-21 22:20:30,804 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 22:20:30,808 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 347 SyntacticMatches, 13 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2020-07-21 22:20:30,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 22:20:30,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 22:20:30,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 22:20:30,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 22:20:30,811 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 189 [2020-07-21 22:20:30,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:30,811 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 22:20:30,811 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 22:20:30,811 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 22:20:30,812 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 22:20:31,016 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:31,021 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 22:20:31,884 WARN L193 SmtUtils]: Spent 443.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 62 [2020-07-21 22:20:32,182 WARN L193 SmtUtils]: Spent 278.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 60 [2020-07-21 22:20:32,345 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 130 DAG size of output: 65 [2020-07-21 22:20:32,681 WARN L193 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 62 [2020-07-21 22:20:32,936 WARN L193 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 62 [2020-07-21 22:20:33,250 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 60 [2020-07-21 22:20:33,463 WARN L193 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 151 DAG size of output: 60 [2020-07-21 22:20:33,621 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 151 DAG size of output: 60 [2020-07-21 22:20:33,863 WARN L193 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 60 [2020-07-21 22:20:34,097 WARN L193 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 62 [2020-07-21 22:20:34,234 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 151 DAG size of output: 60 [2020-07-21 22:20:34,425 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 62 [2020-07-21 22:20:34,566 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 62 [2020-07-21 22:20:34,823 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 60 [2020-07-21 22:20:34,946 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 62 [2020-07-21 22:20:35,060 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 65 [2020-07-21 22:20:35,285 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 151 DAG size of output: 60 [2020-07-21 22:20:35,429 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 62 [2020-07-21 22:20:35,701 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 62 [2020-07-21 22:20:35,928 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 62 [2020-07-21 22:20:36,268 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 62 [2020-07-21 22:20:36,613 WARN L193 SmtUtils]: Spent 314.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 78 [2020-07-21 22:20:36,791 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 166 DAG size of output: 58 [2020-07-21 22:20:37,084 WARN L193 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 78 [2020-07-21 22:20:37,197 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 154 DAG size of output: 47 [2020-07-21 22:20:37,317 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 58 [2020-07-21 22:20:37,450 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 154 DAG size of output: 47 [2020-07-21 22:20:37,624 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 59 [2020-07-21 22:20:37,904 WARN L193 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 78 [2020-07-21 22:20:38,173 WARN L193 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 78 [2020-07-21 22:20:38,325 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 59 [2020-07-21 22:20:38,453 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 189 DAG size of output: 82 [2020-07-21 22:20:38,572 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 58 [2020-07-21 22:20:38,843 WARN L193 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 78 [2020-07-21 22:20:39,085 WARN L193 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 74 [2020-07-21 22:20:39,240 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 154 DAG size of output: 47 [2020-07-21 22:20:39,511 WARN L193 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 78 [2020-07-21 22:20:39,752 WARN L193 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 204 DAG size of output: 76 [2020-07-21 22:20:39,858 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 154 DAG size of output: 47 [2020-07-21 22:20:40,171 WARN L193 SmtUtils]: Spent 293.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 78 [2020-07-21 22:20:40,326 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 166 DAG size of output: 58 [2020-07-21 22:20:40,616 WARN L193 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 78 [2020-07-21 22:20:40,860 WARN L193 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 74 [2020-07-21 22:20:41,130 WARN L193 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 74 [2020-07-21 22:20:41,371 WARN L193 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 74 [2020-07-21 22:20:41,642 WARN L193 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 78 [2020-07-21 22:20:41,878 WARN L193 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 204 DAG size of output: 76 [2020-07-21 22:20:42,175 WARN L193 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 232 DAG size of output: 56 [2020-07-21 22:20:43,126 WARN L193 SmtUtils]: Spent 917.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 27 [2020-07-21 22:20:43,878 WARN L193 SmtUtils]: Spent 729.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 31 [2020-07-21 22:20:43,883 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 22:20:43,884 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 22:20:43,884 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 22:20:43,884 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 22:20:43,884 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 22:20:43,884 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 22:20:43,884 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 39) no Hoare annotation was computed. [2020-07-21 22:20:43,884 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 35 42) the Hoare annotation is: true [2020-07-21 22:20:43,885 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 35 42) no Hoare annotation was computed. [2020-07-21 22:20:43,885 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 35 42) no Hoare annotation was computed. [2020-07-21 22:20:43,885 INFO L268 CegarLoopResult]: For program point L39(line 39) no Hoare annotation was computed. [2020-07-21 22:20:43,885 INFO L268 CegarLoopResult]: For program point L38(lines 38 40) no Hoare annotation was computed. [2020-07-21 22:20:43,885 INFO L264 CegarLoopResult]: At program point L37(line 37) the Hoare annotation is: (and (<= main_~x~0 6) (<= 6 main_~x~0)) [2020-07-21 22:20:43,885 INFO L268 CegarLoopResult]: For program point L37-1(line 37) no Hoare annotation was computed. [2020-07-21 22:20:43,885 INFO L268 CegarLoopResult]: For program point L38-2(lines 38 40) no Hoare annotation was computed. [2020-07-21 22:20:43,886 INFO L271 CegarLoopResult]: At program point fibo2ENTRY(lines 17 25) the Hoare annotation is: true [2020-07-21 22:20:43,887 INFO L264 CegarLoopResult]: At program point L23(line 23) the Hoare annotation is: (and (<= fibo2_~n |fibo2_#in~n|) (<= |fibo2_#in~n| fibo2_~n) (<= 2 |fibo2_#in~n|)) [2020-07-21 22:20:43,887 INFO L268 CegarLoopResult]: For program point L23-1(line 23) no Hoare annotation was computed. [2020-07-21 22:20:43,887 INFO L264 CegarLoopResult]: At program point L23-2(line 23) the Hoare annotation is: (let ((.cse2 (<= 4 |fibo2_#in~n|))) (let ((.cse0 (and .cse2 (<= |fibo2_#in~n| 4) (= 2 |fibo2_#t~ret2|))) (.cse1 (<= |fibo2_#in~n| 3))) (and (<= fibo2_~n |fibo2_#in~n|) (or .cse0 (<= 5 |fibo2_#in~n|) .cse1) (<= |fibo2_#in~n| fibo2_~n) (<= 2 |fibo2_#in~n|) (or .cse0 (<= 6 |fibo2_#in~n|) (and (= 1 |fibo2_#t~ret2|) .cse1) (and (= 3 |fibo2_#t~ret2|) .cse2))))) [2020-07-21 22:20:43,888 INFO L268 CegarLoopResult]: For program point L20(lines 20 24) no Hoare annotation was computed. [2020-07-21 22:20:43,888 INFO L268 CegarLoopResult]: For program point L23-3(line 23) no Hoare annotation was computed. [2020-07-21 22:20:43,888 INFO L268 CegarLoopResult]: For program point L18(lines 18 24) no Hoare annotation was computed. [2020-07-21 22:20:43,888 INFO L268 CegarLoopResult]: For program point fibo2FINAL(lines 17 25) no Hoare annotation was computed. [2020-07-21 22:20:43,888 INFO L268 CegarLoopResult]: For program point fibo2EXIT(lines 17 25) no Hoare annotation was computed. [2020-07-21 22:20:43,889 INFO L271 CegarLoopResult]: At program point fibo1ENTRY(lines 7 15) the Hoare annotation is: true [2020-07-21 22:20:43,889 INFO L264 CegarLoopResult]: At program point L13(line 13) the Hoare annotation is: (and (<= 2 |fibo1_#in~n|) (<= fibo1_~n |fibo1_#in~n|) (<= |fibo1_#in~n| fibo1_~n)) [2020-07-21 22:20:43,889 INFO L268 CegarLoopResult]: For program point L13-1(line 13) no Hoare annotation was computed. [2020-07-21 22:20:43,889 INFO L264 CegarLoopResult]: At program point L13-2(line 13) the Hoare annotation is: (and (let ((.cse0 (<= fibo1_~n |fibo1_#in~n|)) (.cse2 (= 1 |fibo1_#t~ret0|)) (.cse1 (<= |fibo1_#in~n| fibo1_~n))) (or (and .cse0 (= 2 |fibo1_#t~ret0|) .cse1 (<= 4 |fibo1_#in~n|)) (and (<= 5 |fibo1_#in~n|) .cse0 .cse1) (and .cse0 (<= 3 |fibo1_#in~n|) .cse2 .cse1 (<= |fibo1_#in~n| 3)) (and (<= 2 |fibo1_#in~n|) .cse0 (<= |fibo1_#in~n| 2) .cse2 .cse1))) (or (= 5 |fibo1_#t~ret0|) (<= 7 |fibo1_#in~n|) (<= |fibo1_#in~n| 5))) [2020-07-21 22:20:43,889 INFO L268 CegarLoopResult]: For program point fibo1FINAL(lines 7 15) no Hoare annotation was computed. [2020-07-21 22:20:43,889 INFO L268 CegarLoopResult]: For program point L10(lines 10 14) no Hoare annotation was computed. [2020-07-21 22:20:43,889 INFO L268 CegarLoopResult]: For program point L13-3(line 13) no Hoare annotation was computed. [2020-07-21 22:20:43,889 INFO L268 CegarLoopResult]: For program point L8(lines 8 14) no Hoare annotation was computed. [2020-07-21 22:20:43,890 INFO L268 CegarLoopResult]: For program point fibo1EXIT(lines 7 15) no Hoare annotation was computed. [2020-07-21 22:20:43,897 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 10:20:43 BoogieIcfgContainer [2020-07-21 22:20:43,898 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 22:20:43,899 INFO L168 Benchmark]: Toolchain (without parser) took 83233.33 ms. Allocated memory was 137.4 MB in the beginning and 866.1 MB in the end (delta: 728.8 MB). Free memory was 102.3 MB in the beginning and 552.6 MB in the end (delta: -450.2 MB). Peak memory consumption was 717.3 MB. Max. memory is 7.1 GB. [2020-07-21 22:20:43,900 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 137.4 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 22:20:43,900 INFO L168 Benchmark]: CACSL2BoogieTranslator took 257.20 ms. Allocated memory is still 137.4 MB. Free memory was 101.9 MB in the beginning and 92.3 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-21 22:20:43,900 INFO L168 Benchmark]: Boogie Preprocessor took 126.49 ms. Allocated memory was 137.4 MB in the beginning and 202.4 MB in the end (delta: 65.0 MB). Free memory was 92.3 MB in the beginning and 181.1 MB in the end (delta: -88.8 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. [2020-07-21 22:20:43,901 INFO L168 Benchmark]: RCFGBuilder took 358.94 ms. Allocated memory is still 202.4 MB. Free memory was 181.1 MB in the beginning and 167.4 MB in the end (delta: 13.8 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. [2020-07-21 22:20:43,901 INFO L168 Benchmark]: TraceAbstraction took 82483.49 ms. Allocated memory was 202.4 MB in the beginning and 866.1 MB in the end (delta: 663.7 MB). Free memory was 167.4 MB in the beginning and 552.6 MB in the end (delta: -385.2 MB). Peak memory consumption was 717.3 MB. Max. memory is 7.1 GB. [2020-07-21 22:20:43,903 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28 ms. Allocated memory is still 137.4 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 257.20 ms. Allocated memory is still 137.4 MB. Free memory was 101.9 MB in the beginning and 92.3 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 126.49 ms. Allocated memory was 137.4 MB in the beginning and 202.4 MB in the end (delta: 65.0 MB). Free memory was 92.3 MB in the beginning and 181.1 MB in the end (delta: -88.8 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 358.94 ms. Allocated memory is still 202.4 MB. Free memory was 181.1 MB in the beginning and 167.4 MB in the end (delta: 13.8 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 82483.49 ms. Allocated memory was 202.4 MB in the beginning and 866.1 MB in the end (delta: 663.7 MB). Free memory was 167.4 MB in the beginning and 552.6 MB in the end (delta: -385.2 MB). Peak memory consumption was 717.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 39]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 69.5s, OverallIterations: 39, TraceHistogramMax: 18, AutomataDifference: 10.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 12.8s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1150 SDtfs, 1405 SDslu, 8382 SDs, 0 SdLazy, 7499 SolverSat, 1057 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 5.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 11110 GetRequests, 10092 SyntacticMatches, 353 SemanticMatches, 665 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2265 ImplicationChecksByTransitivity, 9.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=148occurred in iteration=29, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.6s AutomataMinimizationTime, 39 MinimizatonAttempts, 708 StatesRemovedByMinimization, 33 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 11 LocationsWithAnnotation, 227 PreInvPairs, 5014 NumberOfFragments, 155 HoareAnnotationTreeSize, 227 FomulaSimplifications, 788375387 FormulaSimplificationTreeSizeReduction, 11.1s HoareSimplificationTime, 11 FomulaSimplificationsInter, 41473 FormulaSimplificationTreeSizeReductionInter, 1.6s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.3s SsaConstructionTime, 1.1s SatisfiabilityAnalysisTime, 43.9s InterpolantComputationTime, 5493 NumberOfCodeBlocks, 3761 NumberOfCodeBlocksAsserted, 102 NumberOfCheckSat, 10883 ConstructedInterpolants, 0 QuantifiedInterpolants, 2979344 SizeOfPredicates, 202 NumberOfNonLiveVariables, 8373 ConjunctsInSsa, 515 ConjunctsInUnsatCore, 76 InterpolantComputations, 2 PerfectInterpolantSequences, 38336/46196 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...