/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -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 13:18:02,525 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 13:18:02,529 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 13:18:02,549 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 13:18:02,550 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 13:18:02,552 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 13:18:02,554 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 13:18:02,565 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 13:18:02,570 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 13:18:02,572 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 13:18:02,574 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 13:18:02,576 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 13:18:02,576 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 13:18:02,578 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 13:18:02,580 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 13:18:02,582 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 13:18:02,584 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 13:18:02,585 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 13:18:02,586 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 13:18:02,592 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 13:18:02,597 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 13:18:02,601 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 13:18:02,602 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 13:18:02,603 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 13:18:02,605 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 13:18:02,616 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 13:18:02,617 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 13:18:02,618 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 13:18:02,619 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 13:18:02,651 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 13:18:02,651 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 13:18:02,654 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 13:18:02,654 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 13:18:02,654 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 13:18:02,654 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 13:18:02,654 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 13:18:02,655 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 13:18:02,655 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 13:18:02,655 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 13:18:02,656 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 13:18:02,656 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 13:18:02,657 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 13:18:02,657 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 13:18:02,657 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 13:18:02,657 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 13:18:02,658 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 13:18:02,658 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 13:18:02,658 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 13:18:02,658 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 13:18:02,658 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 13:18:02,658 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:18:02,659 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 13:18:02,659 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 13:18:02,659 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 13:18:02,659 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 13:18:02,659 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:02,660 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 13:18:02,660 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 13:18:02,660 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 13:18:02,941 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 13:18:02,954 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 13:18:02,958 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 13:18:02,959 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 13:18:02,960 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 13:18:02,960 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_6-1.c [2020-07-21 13:18:03,031 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6dd6b53a8/070e409016fe475688efc68d0b60d065/FLAG0245b8253 [2020-07-21 13:18:03,503 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 13:18:03,505 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_6-1.c [2020-07-21 13:18:03,513 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6dd6b53a8/070e409016fe475688efc68d0b60d065/FLAG0245b8253 [2020-07-21 13:18:03,885 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6dd6b53a8/070e409016fe475688efc68d0b60d065 [2020-07-21 13:18:03,894 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 13:18:03,897 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 13:18:03,898 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 13:18:03,898 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 13:18:03,902 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 13:18:03,903 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:18:03" (1/1) ... [2020-07-21 13:18:03,906 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@58a42d11 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:18:03, skipping insertion in model container [2020-07-21 13:18:03,906 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:18:03" (1/1) ... [2020-07-21 13:18:03,914 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 13:18:03,929 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 13:18:04,140 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:18:04,149 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 13:18:04,173 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:18:04,192 INFO L208 MainTranslator]: Completed translation [2020-07-21 13:18:04,194 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:18:04 WrapperNode [2020-07-21 13:18:04,194 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 13:18:04,195 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 13:18:04,195 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 13:18:04,195 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 13:18:04,212 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:18:04" (1/1) ... [2020-07-21 13:18:04,214 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:18:04" (1/1) ... [2020-07-21 13:18:04,220 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:18:04" (1/1) ... [2020-07-21 13:18:04,220 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:18:04" (1/1) ... [2020-07-21 13:18:04,327 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:18:04" (1/1) ... [2020-07-21 13:18:04,330 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:18:04" (1/1) ... [2020-07-21 13:18:04,336 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:18:04" (1/1) ... [2020-07-21 13:18:04,338 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 13:18:04,340 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 13:18:04,340 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 13:18:04,340 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 13:18:04,341 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:18:04" (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 13:18:04,402 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 13:18:04,402 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 13:18:04,402 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 13:18:04,403 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 13:18:04,403 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 13:18:04,403 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 13:18:04,403 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 13:18:04,403 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 13:18:04,403 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 13:18:04,404 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 13:18:04,404 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 13:18:04,404 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 13:18:04,617 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 13:18:04,617 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 13:18:04,623 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:18:04 BoogieIcfgContainer [2020-07-21 13:18:04,623 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 13:18:04,624 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 13:18:04,624 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 13:18:04,628 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 13:18:04,628 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:18:03" (1/3) ... [2020-07-21 13:18:04,629 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67912f23 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:18:04, skipping insertion in model container [2020-07-21 13:18:04,630 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:18:04" (2/3) ... [2020-07-21 13:18:04,631 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67912f23 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:18:04, skipping insertion in model container [2020-07-21 13:18:04,631 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:18:04" (3/3) ... [2020-07-21 13:18:04,633 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_6-1.c [2020-07-21 13:18:04,642 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 13:18:04,651 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 13:18:04,666 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 13:18:04,688 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 13:18:04,689 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 13:18:04,689 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 13:18:04,689 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 13:18:04,689 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 13:18:04,689 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 13:18:04,689 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 13:18:04,690 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 13:18:04,708 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 13:18:04,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 13:18:04,715 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:04,716 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:18:04,716 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:04,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:04,722 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 13:18:04,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:04,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [746823629] [2020-07-21 13:18:04,730 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:04,798 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:04,799 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:04,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 13:18:04,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:04,962 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 13:18:04,962 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:18:04,965 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [746823629] [2020-07-21 13:18:04,965 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:18:04,966 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:18:04,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035568199] [2020-07-21 13:18:04,975 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:18:04,976 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:04,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:18:04,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:18:04,996 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 13:18:05,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:05,123 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 13:18:05,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:18:05,126 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 13:18:05,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:05,139 INFO L225 Difference]: With dead ends: 44 [2020-07-21 13:18:05,139 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 13:18:05,143 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 13:18:05,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 13:18:05,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 13:18:05,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 13:18:05,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 13:18:05,195 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 13:18:05,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:05,196 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 13:18:05,196 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:18:05,196 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 13:18:05,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 13:18:05,199 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:05,199 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:18:05,413 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:05,414 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:05,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:05,415 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 13:18:05,416 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:05,417 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1219900457] [2020-07-21 13:18:05,418 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:05,454 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:05,454 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:05,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 13:18:05,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:05,495 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 13:18:05,496 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:18:05,498 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1219900457] [2020-07-21 13:18:05,498 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:18:05,498 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:18:05,498 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332220828] [2020-07-21 13:18:05,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:18:05,501 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:05,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:18:05,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:18:05,502 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 13:18:05,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:05,593 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 13:18:05,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:18:05,594 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 13:18:05,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:05,597 INFO L225 Difference]: With dead ends: 36 [2020-07-21 13:18:05,597 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 13:18:05,600 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 13:18:05,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 13:18:05,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 13:18:05,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 13:18:05,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 13:18:05,615 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 13:18:05,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:05,617 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 13:18:05,617 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:18:05,617 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 13:18:05,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 13:18:05,620 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:05,621 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 13:18:05,836 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:05,838 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:05,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:05,839 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 13:18:05,840 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:05,840 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [323729505] [2020-07-21 13:18:05,841 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:05,878 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:05,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:05,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 13:18:05,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:05,965 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 13:18:05,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:06,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:06,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:06,218 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 13:18:06,218 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [323729505] [2020-07-21 13:18:06,219 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:06,219 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 13:18:06,219 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639419754] [2020-07-21 13:18:06,220 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 13:18:06,220 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:06,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 13:18:06,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 13:18:06,221 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-21 13:18:06,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:06,328 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 13:18:06,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 13:18:06,329 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-21 13:18:06,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:06,331 INFO L225 Difference]: With dead ends: 41 [2020-07-21 13:18:06,331 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 13:18:06,332 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 13:18:06,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 13:18:06,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 13:18:06,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 13:18:06,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 13:18:06,342 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 13:18:06,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:06,343 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 13:18:06,343 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 13:18:06,343 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 13:18:06,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 13:18:06,345 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:06,345 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 13:18:06,554 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:06,556 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:06,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:06,557 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 13:18:06,557 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:06,558 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [83243224] [2020-07-21 13:18:06,558 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:18:06,589 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:06,589 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:06,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 13:18:06,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:06,639 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 13:18:06,639 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:06,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:06,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:06,871 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 13:18:06,872 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [83243224] [2020-07-21 13:18:06,873 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:06,873 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 13:18:06,873 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510935309] [2020-07-21 13:18:06,874 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 13:18:06,874 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:06,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 13:18:06,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 13:18:06,876 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-21 13:18:07,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:07,010 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-21 13:18:07,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 13:18:07,011 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 13:18:07,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:07,014 INFO L225 Difference]: With dead ends: 46 [2020-07-21 13:18:07,015 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 13:18:07,018 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 13:18:07,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 13:18:07,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-21 13:18:07,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 13:18:07,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 13:18:07,035 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-21 13:18:07,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:07,035 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 13:18:07,038 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 13:18:07,038 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 13:18:07,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 13:18:07,040 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:07,040 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 13:18:07,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:07,257 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:07,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:07,258 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-21 13:18:07,258 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:07,259 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [241159819] [2020-07-21 13:18:07,259 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:07,301 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:07,301 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:07,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:18:07,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:07,386 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 13:18:07,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:07,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:07,716 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:07,717 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:07,766 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 13:18:07,766 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [241159819] [2020-07-21 13:18:07,766 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:07,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 13:18:07,767 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952153123] [2020-07-21 13:18:07,767 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 13:18:07,768 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:07,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 13:18:07,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 13:18:07,768 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-21 13:18:07,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:07,941 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-21 13:18:07,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 13:18:07,942 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-21 13:18:07,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:07,944 INFO L225 Difference]: With dead ends: 51 [2020-07-21 13:18:07,944 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 13:18:07,945 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 13:18:07,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 13:18:07,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-21 13:18:07,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 13:18:07,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 13:18:07,955 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-21 13:18:07,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:07,955 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 13:18:07,956 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 13:18:07,956 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 13:18:07,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 13:18:07,958 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:07,958 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 13:18:08,171 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:08,173 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:08,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:08,174 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-21 13:18:08,175 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:08,175 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1126274469] [2020-07-21 13:18:08,175 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:08,210 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:08,210 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:08,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:18:08,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:08,259 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 13:18:08,259 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:08,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:08,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:08,544 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:08,585 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 13:18:08,586 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1126274469] [2020-07-21 13:18:08,586 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:08,587 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 13:18:08,587 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202458820] [2020-07-21 13:18:08,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 13:18:08,588 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:08,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 13:18:08,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 13:18:08,588 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-21 13:18:08,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:08,759 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-21 13:18:08,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 13:18:08,760 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-21 13:18:08,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:08,762 INFO L225 Difference]: With dead ends: 56 [2020-07-21 13:18:08,762 INFO L226 Difference]: Without dead ends: 52 [2020-07-21 13:18:08,767 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 13:18:08,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-21 13:18:08,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-21 13:18:08,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 13:18:08,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 13:18:08,783 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-21 13:18:08,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:08,787 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 13:18:08,788 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 13:18:08,788 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 13:18:08,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-21 13:18:08,792 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:08,792 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 13:18:09,001 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:09,002 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:09,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:09,002 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-21 13:18:09,003 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:09,003 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [628715925] [2020-07-21 13:18:09,003 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:09,072 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:09,073 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:09,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:18:09,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:09,154 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 13:18:09,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:09,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:09,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:09,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:09,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:09,758 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 13:18:09,758 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [628715925] [2020-07-21 13:18:09,759 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:09,759 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 13:18:09,759 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537130421] [2020-07-21 13:18:09,760 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 13:18:09,760 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:09,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 13:18:09,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:18:09,761 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 14 states. [2020-07-21 13:18:09,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:09,968 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-21 13:18:09,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:18:09,969 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-07-21 13:18:09,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:09,971 INFO L225 Difference]: With dead ends: 61 [2020-07-21 13:18:09,971 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 13:18:09,972 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 13:18:09,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 13:18:09,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-21 13:18:09,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 13:18:09,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-21 13:18:09,983 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-21 13:18:09,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:09,984 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-21 13:18:09,984 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 13:18:09,984 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-21 13:18:09,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-21 13:18:09,986 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:09,986 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 13:18:10,194 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:10,195 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:10,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:10,195 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-21 13:18:10,196 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:10,197 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [839871591] [2020-07-21 13:18:10,197 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:10,237 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:10,237 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:10,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:18:10,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:10,303 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 13:18:10,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:10,644 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:10,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:10,734 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:10,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:10,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:10,835 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 13:18:10,836 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [839871591] [2020-07-21 13:18:10,837 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:10,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 13:18:10,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316992266] [2020-07-21 13:18:10,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 13:18:10,839 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:10,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 13:18:10,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:18:10,840 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 14 states. [2020-07-21 13:18:11,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:11,047 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2020-07-21 13:18:11,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:18:11,048 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 54 [2020-07-21 13:18:11,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:11,051 INFO L225 Difference]: With dead ends: 66 [2020-07-21 13:18:11,051 INFO L226 Difference]: Without dead ends: 62 [2020-07-21 13:18:11,052 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 13:18:11,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-21 13:18:11,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 45. [2020-07-21 13:18:11,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 13:18:11,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-21 13:18:11,065 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 54 [2020-07-21 13:18:11,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:11,066 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-21 13:18:11,066 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 13:18:11,066 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-21 13:18:11,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-21 13:18:11,068 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:11,068 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 13:18:11,282 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:11,283 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:11,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:11,283 INFO L82 PathProgramCache]: Analyzing trace with hash -975547772, now seen corresponding path program 3 times [2020-07-21 13:18:11,284 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:11,285 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1016927713] [2020-07-21 13:18:11,285 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:18:11,343 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:11,343 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:11,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:18:11,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:11,445 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 13:18:11,446 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:12,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:12,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:12,187 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:12,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:12,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:12,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:12,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:12,394 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 13:18:12,395 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1016927713] [2020-07-21 13:18:12,395 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:12,395 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 13:18:12,395 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2100107267] [2020-07-21 13:18:12,396 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 13:18:12,396 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:12,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 13:18:12,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 13:18:12,397 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 16 states. [2020-07-21 13:18:12,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:12,638 INFO L93 Difference]: Finished difference Result 71 states and 124 transitions. [2020-07-21 13:18:12,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:18:12,638 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 78 [2020-07-21 13:18:12,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:12,641 INFO L225 Difference]: With dead ends: 71 [2020-07-21 13:18:12,641 INFO L226 Difference]: Without dead ends: 67 [2020-07-21 13:18:12,643 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 13:18:12,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-21 13:18:12,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 50. [2020-07-21 13:18:12,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-21 13:18:12,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-21 13:18:12,655 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 78 [2020-07-21 13:18:12,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:12,656 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-21 13:18:12,656 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 13:18:12,656 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-21 13:18:12,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-21 13:18:12,658 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:12,658 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 13:18:12,872 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:12,874 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:12,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:12,875 INFO L82 PathProgramCache]: Analyzing trace with hash 1891337214, now seen corresponding path program 2 times [2020-07-21 13:18:12,875 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:12,875 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1811125878] [2020-07-21 13:18:12,876 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:12,952 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:12,953 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:12,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:18:12,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:13,035 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 13:18:13,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:13,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:13,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:13,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:13,884 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:13,931 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 13:18:13,932 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1811125878] [2020-07-21 13:18:13,932 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:13,932 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 13:18:13,932 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18124221] [2020-07-21 13:18:13,935 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:18:13,936 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:13,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:18:13,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:18:13,936 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 15 states. [2020-07-21 13:18:14,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:14,167 INFO L93 Difference]: Finished difference Result 76 states and 140 transitions. [2020-07-21 13:18:14,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:18:14,167 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 108 [2020-07-21 13:18:14,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:14,170 INFO L225 Difference]: With dead ends: 76 [2020-07-21 13:18:14,170 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 13:18:14,171 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 13:18:14,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 13:18:14,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-21 13:18:14,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-21 13:18:14,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-21 13:18:14,182 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 108 [2020-07-21 13:18:14,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:14,183 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-21 13:18:14,183 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:18:14,183 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-21 13:18:14,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2020-07-21 13:18:14,187 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:14,187 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 13:18:14,400 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:14,401 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:14,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:14,402 INFO L82 PathProgramCache]: Analyzing trace with hash -815433282, now seen corresponding path program 4 times [2020-07-21 13:18:14,402 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:14,403 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2086302834] [2020-07-21 13:18:14,403 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:14,505 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:14,505 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:14,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 465 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 13:18:14,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:14,616 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 13:18:14,616 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:15,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:15,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:15,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:16,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:16,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:16,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:16,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:16,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:16,233 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 13:18:16,234 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2086302834] [2020-07-21 13:18:16,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:16,234 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 13:18:16,234 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195375172] [2020-07-21 13:18:16,235 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 13:18:16,235 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:16,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 13:18:16,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:18:16,236 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 17 states. [2020-07-21 13:18:16,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:16,514 INFO L93 Difference]: Finished difference Result 81 states and 156 transitions. [2020-07-21 13:18:16,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:18:16,514 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 208 [2020-07-21 13:18:16,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:16,517 INFO L225 Difference]: With dead ends: 81 [2020-07-21 13:18:16,517 INFO L226 Difference]: Without dead ends: 77 [2020-07-21 13:18:16,518 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 13:18:16,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-07-21 13:18:16,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 55. [2020-07-21 13:18:16,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-21 13:18:16,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-21 13:18:16,537 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 208 [2020-07-21 13:18:16,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:16,538 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-21 13:18:16,538 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 13:18:16,538 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-21 13:18:16,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2020-07-21 13:18:16,540 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:16,545 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 13:18:16,758 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:16,759 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:16,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:16,760 INFO L82 PathProgramCache]: Analyzing trace with hash -1298373331, now seen corresponding path program 2 times [2020-07-21 13:18:16,761 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:16,761 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1802607533] [2020-07-21 13:18:16,762 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:16,866 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:16,866 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:16,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:18:16,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:16,941 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 13:18:16,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:17,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:17,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:17,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:17,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:17,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:17,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:17,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:17,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:18,001 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 13:18:18,002 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1802607533] [2020-07-21 13:18:18,002 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:18,002 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 13:18:18,002 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249645424] [2020-07-21 13:18:18,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:18:18,003 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:18,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:18:18,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:18:18,004 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 15 states. [2020-07-21 13:18:18,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:18,237 INFO L93 Difference]: Finished difference Result 99 states and 221 transitions. [2020-07-21 13:18:18,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:18:18,242 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 148 [2020-07-21 13:18:18,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:18,245 INFO L225 Difference]: With dead ends: 99 [2020-07-21 13:18:18,245 INFO L226 Difference]: Without dead ends: 95 [2020-07-21 13:18:18,246 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 13:18:18,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-07-21 13:18:18,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 57. [2020-07-21 13:18:18,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-21 13:18:18,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 92 transitions. [2020-07-21 13:18:18,259 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 92 transitions. Word has length 148 [2020-07-21 13:18:18,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:18,259 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 92 transitions. [2020-07-21 13:18:18,259 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:18:18,260 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 92 transitions. [2020-07-21 13:18:18,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-07-21 13:18:18,261 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:18,262 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 13:18:18,475 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:18,476 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:18,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:18,477 INFO L82 PathProgramCache]: Analyzing trace with hash 2095197631, now seen corresponding path program 1 times [2020-07-21 13:18:18,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:18,478 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [887690511] [2020-07-21 13:18:18,479 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:18,575 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:18,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:18,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:18:18,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:18,651 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 13:18:18,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:19,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:19,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:19,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:19,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:19,301 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 13:18:19,301 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [887690511] [2020-07-21 13:18:19,301 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:19,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 13:18:19,302 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475267693] [2020-07-21 13:18:19,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 13:18:19,302 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:19,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 13:18:19,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:18:19,303 INFO L87 Difference]: Start difference. First operand 57 states and 92 transitions. Second operand 13 states. [2020-07-21 13:18:19,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:19,489 INFO L93 Difference]: Finished difference Result 99 states and 217 transitions. [2020-07-21 13:18:19,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:18:19,489 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 123 [2020-07-21 13:18:19,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:19,491 INFO L225 Difference]: With dead ends: 99 [2020-07-21 13:18:19,491 INFO L226 Difference]: Without dead ends: 95 [2020-07-21 13:18:19,493 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 13:18:19,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-07-21 13:18:19,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 59. [2020-07-21 13:18:19,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-07-21 13:18:19,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 98 transitions. [2020-07-21 13:18:19,508 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 98 transitions. Word has length 123 [2020-07-21 13:18:19,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:19,508 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 98 transitions. [2020-07-21 13:18:19,508 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 13:18:19,509 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 98 transitions. [2020-07-21 13:18:19,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2020-07-21 13:18:19,513 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:19,513 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 13:18:19,726 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:19,727 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:19,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:19,728 INFO L82 PathProgramCache]: Analyzing trace with hash 1017418174, now seen corresponding path program 1 times [2020-07-21 13:18:19,728 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:19,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2085506028] [2020-07-21 13:18:19,729 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:18:19,845 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:19,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:19,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 481 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 13:18:19,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:19,958 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 114 proven. 290 refuted. 0 times theorem prover too weak. 845 trivial. 0 not checked. [2020-07-21 13:18:19,958 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:21,019 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:21,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:21,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:21,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:21,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:21,452 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:21,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:21,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:21,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:21,595 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 13:18:21,596 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2085506028] [2020-07-21 13:18:21,596 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:21,596 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 13:18:21,596 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66274372] [2020-07-21 13:18:21,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 13:18:21,597 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:21,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 13:18:21,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:18:21,598 INFO L87 Difference]: Start difference. First operand 59 states and 98 transitions. Second operand 17 states. [2020-07-21 13:18:21,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:21,953 INFO L93 Difference]: Finished difference Result 113 states and 271 transitions. [2020-07-21 13:18:21,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:18:21,954 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 216 [2020-07-21 13:18:21,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:21,958 INFO L225 Difference]: With dead ends: 113 [2020-07-21 13:18:21,958 INFO L226 Difference]: Without dead ends: 67 [2020-07-21 13:18:21,960 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 403 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 13:18:21,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-21 13:18:21,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-07-21 13:18:21,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-07-21 13:18:21,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 104 transitions. [2020-07-21 13:18:21,969 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 104 transitions. Word has length 216 [2020-07-21 13:18:21,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:21,970 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 104 transitions. [2020-07-21 13:18:21,970 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 13:18:21,971 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 104 transitions. [2020-07-21 13:18:21,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-07-21 13:18:21,974 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:21,974 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 13:18:22,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:22,188 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:22,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:22,189 INFO L82 PathProgramCache]: Analyzing trace with hash -1521837768, now seen corresponding path program 2 times [2020-07-21 13:18:22,190 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:22,190 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1890316585] [2020-07-21 13:18:22,190 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:22,293 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:22,293 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:22,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:18:22,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:22,357 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 13:18:22,357 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:22,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:22,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:23,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:23,149 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:23,150 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:23,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:23,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:23,246 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:23,301 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 13:18:23,302 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1890316585] [2020-07-21 13:18:23,302 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:23,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 13:18:23,303 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [61879283] [2020-07-21 13:18:23,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:18:23,304 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:23,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:18:23,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:18:23,304 INFO L87 Difference]: Start difference. First operand 67 states and 104 transitions. Second operand 15 states. [2020-07-21 13:18:23,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:23,539 INFO L93 Difference]: Finished difference Result 107 states and 201 transitions. [2020-07-21 13:18:23,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:18:23,539 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 135 [2020-07-21 13:18:23,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:23,545 INFO L225 Difference]: With dead ends: 107 [2020-07-21 13:18:23,545 INFO L226 Difference]: Without dead ends: 100 [2020-07-21 13:18:23,547 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 13:18:23,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-07-21 13:18:23,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 70. [2020-07-21 13:18:23,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-21 13:18:23,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 112 transitions. [2020-07-21 13:18:23,568 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 112 transitions. Word has length 135 [2020-07-21 13:18:23,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:23,569 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 112 transitions. [2020-07-21 13:18:23,569 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:18:23,570 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 112 transitions. [2020-07-21 13:18:23,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2020-07-21 13:18:23,573 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:23,573 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 13:18:23,787 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:23,788 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:23,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:23,788 INFO L82 PathProgramCache]: Analyzing trace with hash 1102424554, now seen corresponding path program 3 times [2020-07-21 13:18:23,789 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:23,789 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [9175888] [2020-07-21 13:18:23,789 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:23,916 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:23,916 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:23,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 13:18:23,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:24,025 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 159 proven. 114 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2020-07-21 13:18:24,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:24,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:25,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:25,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:25,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:25,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:25,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:25,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:25,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:25,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:25,521 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:25,590 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 13:18:25,590 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [9175888] [2020-07-21 13:18:25,590 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:25,591 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 13:18:25,591 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745304617] [2020-07-21 13:18:25,591 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 13:18:25,592 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:25,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 13:18:25,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:18:25,592 INFO L87 Difference]: Start difference. First operand 70 states and 112 transitions. Second operand 17 states. [2020-07-21 13:18:25,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:25,952 INFO L93 Difference]: Finished difference Result 107 states and 197 transitions. [2020-07-21 13:18:25,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:18:25,953 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 163 [2020-07-21 13:18:25,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:25,955 INFO L225 Difference]: With dead ends: 107 [2020-07-21 13:18:25,955 INFO L226 Difference]: Without dead ends: 75 [2020-07-21 13:18:25,957 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 13:18:25,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-07-21 13:18:25,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2020-07-21 13:18:25,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-21 13:18:25,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 115 transitions. [2020-07-21 13:18:25,966 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 115 transitions. Word has length 163 [2020-07-21 13:18:25,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:25,966 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 115 transitions. [2020-07-21 13:18:25,966 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 13:18:25,966 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 115 transitions. [2020-07-21 13:18:25,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-07-21 13:18:25,968 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:25,969 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 13:18:26,181 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:26,182 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:26,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:26,182 INFO L82 PathProgramCache]: Analyzing trace with hash -2102107778, now seen corresponding path program 4 times [2020-07-21 13:18:26,183 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:26,183 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [796812792] [2020-07-21 13:18:26,183 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:26,309 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:26,309 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:26,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:18:26,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:26,377 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 13:18:26,377 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:26,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:26,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:26,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:26,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:26,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:27,051 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 13:18:27,052 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [796812792] [2020-07-21 13:18:27,052 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:27,052 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 13:18:27,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966552958] [2020-07-21 13:18:27,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 13:18:27,053 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:27,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 13:18:27,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:18:27,054 INFO L87 Difference]: Start difference. First operand 75 states and 115 transitions. Second operand 13 states. [2020-07-21 13:18:27,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:27,234 INFO L93 Difference]: Finished difference Result 107 states and 179 transitions. [2020-07-21 13:18:27,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:18:27,235 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 136 [2020-07-21 13:18:27,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:27,237 INFO L225 Difference]: With dead ends: 107 [2020-07-21 13:18:27,237 INFO L226 Difference]: Without dead ends: 100 [2020-07-21 13:18:27,238 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 13:18:27,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-07-21 13:18:27,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 82. [2020-07-21 13:18:27,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-07-21 13:18:27,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 136 transitions. [2020-07-21 13:18:27,249 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 136 transitions. Word has length 136 [2020-07-21 13:18:27,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:27,249 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 136 transitions. [2020-07-21 13:18:27,250 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 13:18:27,250 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 136 transitions. [2020-07-21 13:18:27,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2020-07-21 13:18:27,252 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:27,252 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 13:18:27,465 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:27,466 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:27,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:27,467 INFO L82 PathProgramCache]: Analyzing trace with hash -1316077641, now seen corresponding path program 5 times [2020-07-21 13:18:27,467 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:27,467 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [10695383] [2020-07-21 13:18:27,467 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:27,596 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:27,596 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:27,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:18:27,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:27,675 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 13:18:27,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:28,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:28,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:28,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:28,546 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:28,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:28,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:28,708 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 13:18:28,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [10695383] [2020-07-21 13:18:28,709 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:28,709 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 13:18:28,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32988894] [2020-07-21 13:18:28,710 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:18:28,710 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:28,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:18:28,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:18:28,710 INFO L87 Difference]: Start difference. First operand 82 states and 136 transitions. Second operand 15 states. [2020-07-21 13:18:28,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:28,930 INFO L93 Difference]: Finished difference Result 117 states and 203 transitions. [2020-07-21 13:18:28,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:18:28,930 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 148 [2020-07-21 13:18:28,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:28,933 INFO L225 Difference]: With dead ends: 117 [2020-07-21 13:18:28,933 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 13:18:28,935 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 13:18:28,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 13:18:28,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 80. [2020-07-21 13:18:28,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-21 13:18:28,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 128 transitions. [2020-07-21 13:18:28,943 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 128 transitions. Word has length 148 [2020-07-21 13:18:28,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:28,944 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 128 transitions. [2020-07-21 13:18:28,944 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:18:28,944 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 128 transitions. [2020-07-21 13:18:28,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2020-07-21 13:18:28,946 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:28,946 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 13:18:29,160 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:29,161 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:29,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:29,162 INFO L82 PathProgramCache]: Analyzing trace with hash -872965087, now seen corresponding path program 6 times [2020-07-21 13:18:29,162 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:29,162 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [508006245] [2020-07-21 13:18:29,163 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:29,297 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:29,297 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:29,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:18:29,301 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:29,357 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 13:18:29,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:29,816 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:29,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:29,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:29,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:29,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:29,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:30,011 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:30,092 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 13:18:30,092 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [508006245] [2020-07-21 13:18:30,093 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:30,093 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 13:18:30,093 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736974801] [2020-07-21 13:18:30,095 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 13:18:30,095 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:30,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 13:18:30,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:18:30,096 INFO L87 Difference]: Start difference. First operand 80 states and 128 transitions. Second operand 13 states. [2020-07-21 13:18:30,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:30,280 INFO L93 Difference]: Finished difference Result 114 states and 190 transitions. [2020-07-21 13:18:30,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:18:30,281 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 149 [2020-07-21 13:18:30,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:30,283 INFO L225 Difference]: With dead ends: 114 [2020-07-21 13:18:30,283 INFO L226 Difference]: Without dead ends: 107 [2020-07-21 13:18:30,284 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 13:18:30,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-21 13:18:30,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 80. [2020-07-21 13:18:30,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-21 13:18:30,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 128 transitions. [2020-07-21 13:18:30,294 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 128 transitions. Word has length 149 [2020-07-21 13:18:30,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:30,296 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 128 transitions. [2020-07-21 13:18:30,296 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 13:18:30,296 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 128 transitions. [2020-07-21 13:18:30,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2020-07-21 13:18:30,299 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:30,299 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 13:18:30,512 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:30,513 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:30,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:30,513 INFO L82 PathProgramCache]: Analyzing trace with hash -529934979, now seen corresponding path program 7 times [2020-07-21 13:18:30,514 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:30,514 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1524009498] [2020-07-21 13:18:30,514 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:30,655 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:30,655 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:30,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:18:30,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:30,721 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 13:18:30,721 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:31,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:31,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:31,299 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:31,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:31,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:31,505 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 13:18:31,505 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1524009498] [2020-07-21 13:18:31,505 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:31,505 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 13:18:31,506 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186660887] [2020-07-21 13:18:31,506 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 13:18:31,506 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:31,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 13:18:31,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:18:31,507 INFO L87 Difference]: Start difference. First operand 80 states and 128 transitions. Second operand 13 states. [2020-07-21 13:18:31,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:31,679 INFO L93 Difference]: Finished difference Result 106 states and 183 transitions. [2020-07-21 13:18:31,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:18:31,679 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 150 [2020-07-21 13:18:31,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:31,681 INFO L225 Difference]: With dead ends: 106 [2020-07-21 13:18:31,681 INFO L226 Difference]: Without dead ends: 99 [2020-07-21 13:18:31,682 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 279 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 13:18:31,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-07-21 13:18:31,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 92. [2020-07-21 13:18:31,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-07-21 13:18:31,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 161 transitions. [2020-07-21 13:18:31,694 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 161 transitions. Word has length 150 [2020-07-21 13:18:31,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:31,694 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 161 transitions. [2020-07-21 13:18:31,694 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 13:18:31,694 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 161 transitions. [2020-07-21 13:18:31,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2020-07-21 13:18:31,696 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:31,697 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 13:18:31,906 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:31,907 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:31,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:31,908 INFO L82 PathProgramCache]: Analyzing trace with hash 1102006884, now seen corresponding path program 8 times [2020-07-21 13:18:31,908 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:31,908 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [274203171] [2020-07-21 13:18:31,908 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:32,060 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:32,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:32,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 361 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:18:32,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:32,139 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 13:18:32,140 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:32,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:32,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:32,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:32,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:32,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:32,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:33,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:33,190 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 13:18:33,191 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [274203171] [2020-07-21 13:18:33,191 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:33,191 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 13:18:33,191 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742464497] [2020-07-21 13:18:33,192 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:18:33,192 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:33,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:18:33,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:18:33,192 INFO L87 Difference]: Start difference. First operand 92 states and 161 transitions. Second operand 15 states. [2020-07-21 13:18:33,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:33,394 INFO L93 Difference]: Finished difference Result 117 states and 207 transitions. [2020-07-21 13:18:33,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:18:33,398 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 162 [2020-07-21 13:18:33,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:33,401 INFO L225 Difference]: With dead ends: 117 [2020-07-21 13:18:33,401 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 13:18:33,402 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 13:18:33,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 13:18:33,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 96. [2020-07-21 13:18:33,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-07-21 13:18:33,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 158 transitions. [2020-07-21 13:18:33,411 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 158 transitions. Word has length 162 [2020-07-21 13:18:33,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:33,412 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 158 transitions. [2020-07-21 13:18:33,412 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:18:33,412 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 158 transitions. [2020-07-21 13:18:33,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2020-07-21 13:18:33,414 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:33,415 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 13:18:33,628 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:33,629 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:33,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:33,630 INFO L82 PathProgramCache]: Analyzing trace with hash 1920867700, now seen corresponding path program 9 times [2020-07-21 13:18:33,630 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:33,631 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [643415312] [2020-07-21 13:18:33,631 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:33,784 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:33,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:33,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:18:33,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:33,848 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 13:18:33,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:34,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:34,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:34,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:34,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:34,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:34,380 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:34,446 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:34,575 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 13:18:34,575 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [643415312] [2020-07-21 13:18:34,575 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:34,575 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 13:18:34,576 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80584812] [2020-07-21 13:18:34,576 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 13:18:34,576 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:34,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 13:18:34,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:18:34,577 INFO L87 Difference]: Start difference. First operand 96 states and 158 transitions. Second operand 13 states. [2020-07-21 13:18:34,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:34,751 INFO L93 Difference]: Finished difference Result 129 states and 217 transitions. [2020-07-21 13:18:34,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:18:34,753 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 163 [2020-07-21 13:18:34,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:34,756 INFO L225 Difference]: With dead ends: 129 [2020-07-21 13:18:34,756 INFO L226 Difference]: Without dead ends: 122 [2020-07-21 13:18:34,757 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 13:18:34,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-07-21 13:18:34,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 93. [2020-07-21 13:18:34,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-21 13:18:34,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 149 transitions. [2020-07-21 13:18:34,770 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 149 transitions. Word has length 163 [2020-07-21 13:18:34,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:34,771 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 149 transitions. [2020-07-21 13:18:34,771 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 13:18:34,771 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 149 transitions. [2020-07-21 13:18:34,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2020-07-21 13:18:34,790 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:34,790 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 13:18:35,003 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:35,004 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:35,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:35,004 INFO L82 PathProgramCache]: Analyzing trace with hash -1607241826, now seen corresponding path program 10 times [2020-07-21 13:18:35,005 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:35,005 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1864123503] [2020-07-21 13:18:35,005 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:35,161 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:35,162 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:35,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:18:35,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:35,218 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 13:18:35,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:35,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:35,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:35,545 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:35,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:35,742 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 13:18:35,743 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1864123503] [2020-07-21 13:18:35,743 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:35,743 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 13:18:35,743 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604938115] [2020-07-21 13:18:35,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 13:18:35,744 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:35,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 13:18:35,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-21 13:18:35,745 INFO L87 Difference]: Start difference. First operand 93 states and 149 transitions. Second operand 11 states. [2020-07-21 13:18:35,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:35,871 INFO L93 Difference]: Finished difference Result 131 states and 225 transitions. [2020-07-21 13:18:35,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 13:18:35,872 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 164 [2020-07-21 13:18:35,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:35,874 INFO L225 Difference]: With dead ends: 131 [2020-07-21 13:18:35,874 INFO L226 Difference]: Without dead ends: 124 [2020-07-21 13:18:35,875 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 13:18:35,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-21 13:18:35,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 95. [2020-07-21 13:18:35,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-07-21 13:18:35,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 157 transitions. [2020-07-21 13:18:35,885 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 157 transitions. Word has length 164 [2020-07-21 13:18:35,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:35,885 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 157 transitions. [2020-07-21 13:18:35,885 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 13:18:35,886 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 157 transitions. [2020-07-21 13:18:35,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2020-07-21 13:18:35,888 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:35,888 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 13:18:36,102 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:36,103 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:36,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:36,103 INFO L82 PathProgramCache]: Analyzing trace with hash -315995755, now seen corresponding path program 11 times [2020-07-21 13:18:36,103 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:36,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1654007695] [2020-07-21 13:18:36,104 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:36,264 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:36,265 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:36,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 392 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:18:36,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:36,338 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 13:18:36,339 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:36,761 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:36,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:36,883 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:36,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:36,995 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:37,146 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 13:18:37,147 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1654007695] [2020-07-21 13:18:37,147 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:37,147 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 13:18:37,148 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518853689] [2020-07-21 13:18:37,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 13:18:37,148 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:37,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 13:18:37,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:18:37,150 INFO L87 Difference]: Start difference. First operand 95 states and 157 transitions. Second operand 13 states. [2020-07-21 13:18:37,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:37,303 INFO L93 Difference]: Finished difference Result 110 states and 175 transitions. [2020-07-21 13:18:37,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:18:37,304 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 176 [2020-07-21 13:18:37,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:37,306 INFO L225 Difference]: With dead ends: 110 [2020-07-21 13:18:37,306 INFO L226 Difference]: Without dead ends: 103 [2020-07-21 13:18:37,307 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 13:18:37,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-21 13:18:37,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 93. [2020-07-21 13:18:37,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-21 13:18:37,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 149 transitions. [2020-07-21 13:18:37,315 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 149 transitions. Word has length 176 [2020-07-21 13:18:37,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:37,316 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 149 transitions. [2020-07-21 13:18:37,316 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 13:18:37,316 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 149 transitions. [2020-07-21 13:18:37,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2020-07-21 13:18:37,318 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:37,318 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 13:18:37,532 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:37,533 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:37,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:37,534 INFO L82 PathProgramCache]: Analyzing trace with hash -854759576, now seen corresponding path program 12 times [2020-07-21 13:18:37,534 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:37,534 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [770817861] [2020-07-21 13:18:37,534 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:37,697 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:37,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:37,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 425 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:18:37,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:37,774 INFO L134 CoverageAnalysis]: Checked inductivity of 938 backedges. 251 proven. 45 refuted. 0 times theorem prover too weak. 642 trivial. 0 not checked. [2020-07-21 13:18:37,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:38,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:38,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:38,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:38,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:38,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:38,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:38,874 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 13:18:38,874 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [770817861] [2020-07-21 13:18:38,874 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:38,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 13:18:38,875 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203814459] [2020-07-21 13:18:38,875 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:18:38,875 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:38,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:18:38,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:18:38,876 INFO L87 Difference]: Start difference. First operand 93 states and 149 transitions. Second operand 15 states. [2020-07-21 13:18:39,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:39,103 INFO L93 Difference]: Finished difference Result 123 states and 202 transitions. [2020-07-21 13:18:39,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:18:39,104 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 191 [2020-07-21 13:18:39,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:39,106 INFO L225 Difference]: With dead ends: 123 [2020-07-21 13:18:39,107 INFO L226 Difference]: Without dead ends: 116 [2020-07-21 13:18:39,108 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 13:18:39,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-07-21 13:18:39,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 101. [2020-07-21 13:18:39,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-07-21 13:18:39,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 173 transitions. [2020-07-21 13:18:39,117 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 173 transitions. Word has length 191 [2020-07-21 13:18:39,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:39,118 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 173 transitions. [2020-07-21 13:18:39,118 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:18:39,118 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 173 transitions. [2020-07-21 13:18:39,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2020-07-21 13:18:39,120 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:39,121 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 13:18:39,335 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:39,336 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:39,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:39,336 INFO L82 PathProgramCache]: Analyzing trace with hash -31808317, now seen corresponding path program 13 times [2020-07-21 13:18:39,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:39,337 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1645845324] [2020-07-21 13:18:39,337 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:39,519 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:39,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:39,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 454 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 13:18:39,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:39,602 INFO L134 CoverageAnalysis]: Checked inductivity of 1073 backedges. 270 proven. 100 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2020-07-21 13:18:39,602 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:40,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:40,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:40,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:40,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:40,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:40,863 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:40,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:40,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:40,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:40,995 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:41,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:41,206 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 13:18:41,207 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1645845324] [2020-07-21 13:18:41,207 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:41,207 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 13:18:41,207 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146663885] [2020-07-21 13:18:41,208 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 13:18:41,208 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:41,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 13:18:41,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:18:41,209 INFO L87 Difference]: Start difference. First operand 101 states and 173 transitions. Second operand 17 states. [2020-07-21 13:18:41,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:41,493 INFO L93 Difference]: Finished difference Result 121 states and 205 transitions. [2020-07-21 13:18:41,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:18:41,493 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 204 [2020-07-21 13:18:41,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:41,496 INFO L225 Difference]: With dead ends: 121 [2020-07-21 13:18:41,496 INFO L226 Difference]: Without dead ends: 114 [2020-07-21 13:18:41,497 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 13:18:41,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-07-21 13:18:41,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 93. [2020-07-21 13:18:41,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-21 13:18:41,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 161 transitions. [2020-07-21 13:18:41,506 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 161 transitions. Word has length 204 [2020-07-21 13:18:41,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:41,507 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 161 transitions. [2020-07-21 13:18:41,507 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 13:18:41,507 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 161 transitions. [2020-07-21 13:18:41,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2020-07-21 13:18:41,509 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:41,509 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 13:18:41,722 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:41,723 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:41,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:41,724 INFO L82 PathProgramCache]: Analyzing trace with hash 307857833, now seen corresponding path program 14 times [2020-07-21 13:18:41,724 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:41,724 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [504059891] [2020-07-21 13:18:41,724 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:41,903 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:41,904 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:41,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 103 conjunts are in the unsatisfiable core [2020-07-21 13:18:41,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:42,379 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 13:18:42,379 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:44,162 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 13:18:44,163 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [504059891] [2020-07-21 13:18:44,163 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:44,163 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 36 [2020-07-21 13:18:44,163 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [189318175] [2020-07-21 13:18:44,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 13:18:44,164 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:44,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 13:18:44,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1175, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 13:18:44,165 INFO L87 Difference]: Start difference. First operand 93 states and 161 transitions. Second operand 36 states. [2020-07-21 13:18:45,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:45,008 INFO L93 Difference]: Finished difference Result 226 states and 521 transitions. [2020-07-21 13:18:45,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 13:18:45,008 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 177 [2020-07-21 13:18:45,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:45,019 INFO L225 Difference]: With dead ends: 226 [2020-07-21 13:18:45,019 INFO L226 Difference]: Without dead ends: 219 [2020-07-21 13:18:45,022 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 319 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=109, Invalid=1613, Unknown=0, NotChecked=0, Total=1722 [2020-07-21 13:18:45,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2020-07-21 13:18:45,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 145. [2020-07-21 13:18:45,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 145 states. [2020-07-21 13:18:45,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 323 transitions. [2020-07-21 13:18:45,050 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 323 transitions. Word has length 177 [2020-07-21 13:18:45,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:45,051 INFO L479 AbstractCegarLoop]: Abstraction has 145 states and 323 transitions. [2020-07-21 13:18:45,051 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 13:18:45,051 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 323 transitions. [2020-07-21 13:18:45,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2020-07-21 13:18:45,055 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:45,055 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 13:18:45,268 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:45,269 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:45,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:45,269 INFO L82 PathProgramCache]: Analyzing trace with hash -1104223868, now seen corresponding path program 15 times [2020-07-21 13:18:45,270 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:45,270 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [307553222] [2020-07-21 13:18:45,270 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:45,465 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:45,465 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:45,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 425 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:18:45,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:45,554 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 148 proven. 140 refuted. 0 times theorem prover too weak. 642 trivial. 0 not checked. [2020-07-21 13:18:45,554 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:46,284 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:46,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:46,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:46,531 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:46,531 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:46,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:46,578 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:46,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:46,643 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:46,741 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 148 proven. 152 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2020-07-21 13:18:46,741 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [307553222] [2020-07-21 13:18:46,742 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:46,742 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 13:18:46,742 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149873797] [2020-07-21 13:18:46,742 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:18:46,742 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:46,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:18:46,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:18:46,743 INFO L87 Difference]: Start difference. First operand 145 states and 323 transitions. Second operand 15 states. [2020-07-21 13:18:47,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:47,018 INFO L93 Difference]: Finished difference Result 205 states and 526 transitions. [2020-07-21 13:18:47,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:18:47,018 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 191 [2020-07-21 13:18:47,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:47,022 INFO L225 Difference]: With dead ends: 205 [2020-07-21 13:18:47,022 INFO L226 Difference]: Without dead ends: 173 [2020-07-21 13:18:47,025 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 13:18:47,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2020-07-21 13:18:47,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 154. [2020-07-21 13:18:47,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2020-07-21 13:18:47,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 344 transitions. [2020-07-21 13:18:47,048 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 344 transitions. Word has length 191 [2020-07-21 13:18:47,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:47,049 INFO L479 AbstractCegarLoop]: Abstraction has 154 states and 344 transitions. [2020-07-21 13:18:47,049 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:18:47,049 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 344 transitions. [2020-07-21 13:18:47,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 13:18:47,055 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:47,055 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, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:18:47,268 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:47,269 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:47,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:47,269 INFO L82 PathProgramCache]: Analyzing trace with hash -1441264276, now seen corresponding path program 16 times [2020-07-21 13:18:47,269 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:47,269 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1200692654] [2020-07-21 13:18:47,270 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:47,466 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:47,466 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:47,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:18:47,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:47,539 INFO L134 CoverageAnalysis]: Checked inductivity of 928 backedges. 93 proven. 201 refuted. 0 times theorem prover too weak. 634 trivial. 0 not checked. [2020-07-21 13:18:47,540 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:48,225 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:48,225 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:48,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:48,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:48,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:48,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:48,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:48,615 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:48,633 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:48,678 INFO L134 CoverageAnalysis]: Checked inductivity of 928 backedges. 97 proven. 207 refuted. 0 times theorem prover too weak. 624 trivial. 0 not checked. [2020-07-21 13:18:48,678 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1200692654] [2020-07-21 13:18:48,678 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:48,678 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 13:18:48,678 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311626455] [2020-07-21 13:18:48,679 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:18:48,679 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:48,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:18:48,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:18:48,680 INFO L87 Difference]: Start difference. First operand 154 states and 344 transitions. Second operand 15 states. [2020-07-21 13:18:48,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:48,905 INFO L93 Difference]: Finished difference Result 205 states and 460 transitions. [2020-07-21 13:18:48,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:18:48,906 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 13:18:48,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:48,908 INFO L225 Difference]: With dead ends: 205 [2020-07-21 13:18:48,908 INFO L226 Difference]: Without dead ends: 154 [2020-07-21 13:18:48,911 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 355 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 13:18:48,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2020-07-21 13:18:48,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 148. [2020-07-21 13:18:48,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2020-07-21 13:18:48,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 314 transitions. [2020-07-21 13:18:48,928 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 314 transitions. Word has length 190 [2020-07-21 13:18:48,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:48,929 INFO L479 AbstractCegarLoop]: Abstraction has 148 states and 314 transitions. [2020-07-21 13:18:48,929 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:18:48,929 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 314 transitions. [2020-07-21 13:18:48,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2020-07-21 13:18:48,934 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:48,934 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 12, 11, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:18:49,149 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:49,150 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:49,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:49,150 INFO L82 PathProgramCache]: Analyzing trace with hash 2034664010, now seen corresponding path program 17 times [2020-07-21 13:18:49,150 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:49,150 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [156316306] [2020-07-21 13:18:49,151 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:49,368 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:49,368 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:49,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 481 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:18:49,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:49,446 INFO L134 CoverageAnalysis]: Checked inductivity of 1217 backedges. 190 proven. 171 refuted. 0 times theorem prover too weak. 856 trivial. 0 not checked. [2020-07-21 13:18:49,447 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:50,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:50,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:50,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:50,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:50,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:50,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:50,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:50,823 INFO L134 CoverageAnalysis]: Checked inductivity of 1217 backedges. 192 proven. 177 refuted. 0 times theorem prover too weak. 848 trivial. 0 not checked. [2020-07-21 13:18:50,824 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [156316306] [2020-07-21 13:18:50,825 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:50,825 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 13:18:50,826 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395581561] [2020-07-21 13:18:50,826 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:18:50,826 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:50,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:18:50,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:18:50,827 INFO L87 Difference]: Start difference. First operand 148 states and 314 transitions. Second operand 15 states. [2020-07-21 13:18:51,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:51,102 INFO L93 Difference]: Finished difference Result 203 states and 459 transitions. [2020-07-21 13:18:51,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:18:51,103 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 216 [2020-07-21 13:18:51,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:51,107 INFO L225 Difference]: With dead ends: 203 [2020-07-21 13:18:51,108 INFO L226 Difference]: Without dead ends: 166 [2020-07-21 13:18:51,111 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 436 GetRequests, 407 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 13:18:51,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2020-07-21 13:18:51,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 154. [2020-07-21 13:18:51,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2020-07-21 13:18:51,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 320 transitions. [2020-07-21 13:18:51,134 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 320 transitions. Word has length 216 [2020-07-21 13:18:51,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:51,135 INFO L479 AbstractCegarLoop]: Abstraction has 154 states and 320 transitions. [2020-07-21 13:18:51,135 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:18:51,135 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 320 transitions. [2020-07-21 13:18:51,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2020-07-21 13:18:51,141 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:51,141 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 11, 10, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:18:51,354 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:51,355 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:51,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:51,356 INFO L82 PathProgramCache]: Analyzing trace with hash 519968671, now seen corresponding path program 18 times [2020-07-21 13:18:51,356 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:51,357 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1402010257] [2020-07-21 13:18:51,357 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:51,575 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:51,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:51,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 450 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:18:51,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:51,650 INFO L134 CoverageAnalysis]: Checked inductivity of 1052 backedges. 234 proven. 80 refuted. 0 times theorem prover too weak. 738 trivial. 0 not checked. [2020-07-21 13:18:51,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:52,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:52,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:52,425 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:52,426 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:52,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:52,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:52,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:52,554 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:52,584 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:52,648 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:52,878 INFO L134 CoverageAnalysis]: Checked inductivity of 1052 backedges. 236 proven. 88 refuted. 0 times theorem prover too weak. 728 trivial. 0 not checked. [2020-07-21 13:18:52,879 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1402010257] [2020-07-21 13:18:52,879 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:52,879 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 13:18:52,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955841964] [2020-07-21 13:18:52,880 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:18:52,880 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:52,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:18:52,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:18:52,881 INFO L87 Difference]: Start difference. First operand 154 states and 320 transitions. Second operand 15 states. [2020-07-21 13:18:53,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:53,109 INFO L93 Difference]: Finished difference Result 185 states and 377 transitions. [2020-07-21 13:18:53,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:18:53,109 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 202 [2020-07-21 13:18:53,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:53,113 INFO L225 Difference]: With dead ends: 185 [2020-07-21 13:18:53,113 INFO L226 Difference]: Without dead ends: 178 [2020-07-21 13:18:53,116 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 379 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 13:18:53,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-07-21 13:18:53,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 149. [2020-07-21 13:18:53,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2020-07-21 13:18:53,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 310 transitions. [2020-07-21 13:18:53,139 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 310 transitions. Word has length 202 [2020-07-21 13:18:53,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:53,139 INFO L479 AbstractCegarLoop]: Abstraction has 149 states and 310 transitions. [2020-07-21 13:18:53,139 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:18:53,139 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 310 transitions. [2020-07-21 13:18:53,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-21 13:18:53,144 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:53,144 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 13, 13, 10, 10, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:18:53,357 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:53,358 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:53,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:53,358 INFO L82 PathProgramCache]: Analyzing trace with hash 432264059, now seen corresponding path program 19 times [2020-07-21 13:18:53,358 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:53,359 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1364732233] [2020-07-21 13:18:53,359 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:53,683 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:53,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:53,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 13:18:53,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:53,828 INFO L134 CoverageAnalysis]: Checked inductivity of 1054 backedges. 105 proven. 222 refuted. 0 times theorem prover too weak. 727 trivial. 0 not checked. [2020-07-21 13:18:53,828 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:54,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:54,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:54,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:55,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:55,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:55,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:55,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:55,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:55,283 INFO L134 CoverageAnalysis]: Checked inductivity of 1054 backedges. 105 proven. 230 refuted. 0 times theorem prover too weak. 719 trivial. 0 not checked. [2020-07-21 13:18:55,284 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1364732233] [2020-07-21 13:18:55,284 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:55,284 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 17 [2020-07-21 13:18:55,284 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2061358673] [2020-07-21 13:18:55,285 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 13:18:55,285 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:55,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 13:18:55,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:18:55,286 INFO L87 Difference]: Start difference. First operand 149 states and 310 transitions. Second operand 17 states. [2020-07-21 13:18:55,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:55,596 INFO L93 Difference]: Finished difference Result 200 states and 420 transitions. [2020-07-21 13:18:55,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:18:55,597 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 201 [2020-07-21 13:18:55,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:55,600 INFO L225 Difference]: With dead ends: 200 [2020-07-21 13:18:55,600 INFO L226 Difference]: Without dead ends: 149 [2020-07-21 13:18:55,606 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 375 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 13:18:55,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2020-07-21 13:18:55,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2020-07-21 13:18:55,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2020-07-21 13:18:55,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 299 transitions. [2020-07-21 13:18:55,627 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 299 transitions. Word has length 201 [2020-07-21 13:18:55,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:55,628 INFO L479 AbstractCegarLoop]: Abstraction has 149 states and 299 transitions. [2020-07-21 13:18:55,628 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 13:18:55,628 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 299 transitions. [2020-07-21 13:18:55,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2020-07-21 13:18:55,632 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:55,632 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 13:18:55,847 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:55,848 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:55,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:55,849 INFO L82 PathProgramCache]: Analyzing trace with hash 1843327003, now seen corresponding path program 20 times [2020-07-21 13:18:55,850 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:55,850 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1310586487] [2020-07-21 13:18:55,850 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:56,085 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:56,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:56,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 396 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:18:56,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:56,159 INFO L134 CoverageAnalysis]: Checked inductivity of 796 backedges. 185 proven. 32 refuted. 0 times theorem prover too weak. 579 trivial. 0 not checked. [2020-07-21 13:18:56,160 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:56,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:56,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:56,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:56,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:56,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:56,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:56,826 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:56,981 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 13:18:56,982 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1310586487] [2020-07-21 13:18:56,982 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:56,982 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 13:18:56,983 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818575157] [2020-07-21 13:18:56,983 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 13:18:56,983 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:56,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 13:18:56,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:18:56,984 INFO L87 Difference]: Start difference. First operand 149 states and 299 transitions. Second operand 13 states. [2020-07-21 13:18:57,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:57,159 INFO L93 Difference]: Finished difference Result 175 states and 344 transitions. [2020-07-21 13:18:57,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:18:57,159 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 178 [2020-07-21 13:18:57,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:57,162 INFO L225 Difference]: With dead ends: 175 [2020-07-21 13:18:57,162 INFO L226 Difference]: Without dead ends: 168 [2020-07-21 13:18:57,164 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 13:18:57,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-07-21 13:18:57,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 149. [2020-07-21 13:18:57,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2020-07-21 13:18:57,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 299 transitions. [2020-07-21 13:18:57,181 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 299 transitions. Word has length 178 [2020-07-21 13:18:57,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:57,181 INFO L479 AbstractCegarLoop]: Abstraction has 149 states and 299 transitions. [2020-07-21 13:18:57,181 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 13:18:57,181 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 299 transitions. [2020-07-21 13:18:57,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-21 13:18:57,186 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:57,186 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 13:18:57,399 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:57,400 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:57,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:57,400 INFO L82 PathProgramCache]: Analyzing trace with hash -1156996270, now seen corresponding path program 21 times [2020-07-21 13:18:57,401 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:57,401 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [701625562] [2020-07-21 13:18:57,401 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:57,662 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:57,662 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:57,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 421 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 13:18:57,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:18:57,761 INFO L134 CoverageAnalysis]: Checked inductivity of 910 backedges. 234 proven. 69 refuted. 0 times theorem prover too weak. 607 trivial. 0 not checked. [2020-07-21 13:18:57,761 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:18:58,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:58,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:58,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:58,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:58,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:58,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:58,873 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:58,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:59,141 INFO L134 CoverageAnalysis]: Checked inductivity of 910 backedges. 232 proven. 79 refuted. 0 times theorem prover too weak. 599 trivial. 0 not checked. [2020-07-21 13:18:59,141 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [701625562] [2020-07-21 13:18:59,141 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:59,142 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 17 [2020-07-21 13:18:59,142 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176498908] [2020-07-21 13:18:59,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 13:18:59,142 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:59,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 13:18:59,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:18:59,143 INFO L87 Difference]: Start difference. First operand 149 states and 299 transitions. Second operand 17 states. [2020-07-21 13:18:59,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:59,497 INFO L93 Difference]: Finished difference Result 186 states and 393 transitions. [2020-07-21 13:18:59,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:18:59,497 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 189 [2020-07-21 13:18:59,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:59,501 INFO L225 Difference]: With dead ends: 186 [2020-07-21 13:18:59,502 INFO L226 Difference]: Without dead ends: 179 [2020-07-21 13:18:59,505 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 351 SyntacticMatches, 11 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=105, Invalid=357, Unknown=0, NotChecked=0, Total=462 [2020-07-21 13:18:59,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2020-07-21 13:18:59,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 149. [2020-07-21 13:18:59,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2020-07-21 13:18:59,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 309 transitions. [2020-07-21 13:18:59,540 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 309 transitions. Word has length 189 [2020-07-21 13:18:59,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:59,540 INFO L479 AbstractCegarLoop]: Abstraction has 149 states and 309 transitions. [2020-07-21 13:18:59,540 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 13:18:59,540 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 309 transitions. [2020-07-21 13:18:59,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2020-07-21 13:18:59,545 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:59,545 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 14, 14, 10, 10, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:18:59,758 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:59,759 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:59,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:59,760 INFO L82 PathProgramCache]: Analyzing trace with hash -181322798, now seen corresponding path program 22 times [2020-07-21 13:18:59,760 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:59,761 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1448469105] [2020-07-21 13:18:59,761 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:19:00,010 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:00,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:00,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 475 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 13:19:00,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:00,168 INFO L134 CoverageAnalysis]: Checked inductivity of 1194 backedges. 159 proven. 196 refuted. 0 times theorem prover too weak. 839 trivial. 0 not checked. [2020-07-21 13:19:00,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:01,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:01,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:01,393 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:01,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:01,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:01,576 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:01,666 INFO L134 CoverageAnalysis]: Checked inductivity of 1194 backedges. 157 proven. 206 refuted. 0 times theorem prover too weak. 831 trivial. 0 not checked. [2020-07-21 13:19:01,667 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1448469105] [2020-07-21 13:19:01,667 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:01,667 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 17 [2020-07-21 13:19:01,667 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084600082] [2020-07-21 13:19:01,668 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 13:19:01,668 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:01,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 13:19:01,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:19:01,669 INFO L87 Difference]: Start difference. First operand 149 states and 309 transitions. Second operand 17 states. [2020-07-21 13:19:01,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:01,977 INFO L93 Difference]: Finished difference Result 187 states and 394 transitions. [2020-07-21 13:19:01,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:19:01,978 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 213 [2020-07-21 13:19:01,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:01,981 INFO L225 Difference]: With dead ends: 187 [2020-07-21 13:19:01,981 INFO L226 Difference]: Without dead ends: 155 [2020-07-21 13:19:01,982 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 399 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 13:19:01,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2020-07-21 13:19:01,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 136. [2020-07-21 13:19:01,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-07-21 13:19:01,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 263 transitions. [2020-07-21 13:19:01,999 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 263 transitions. Word has length 213 [2020-07-21 13:19:01,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:01,999 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 263 transitions. [2020-07-21 13:19:01,999 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 13:19:01,999 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 263 transitions. [2020-07-21 13:19:02,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-21 13:19:02,002 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:02,003 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 10, 10, 8, 8, 8, 8, 8, 8, 8, 7, 6, 6, 6, 6, 6, 6, 6, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:19:02,216 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:02,217 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:02,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:02,217 INFO L82 PathProgramCache]: Analyzing trace with hash 1645420489, now seen corresponding path program 23 times [2020-07-21 13:19:02,218 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:02,218 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1841973780] [2020-07-21 13:19:02,218 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:02,464 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:02,464 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:02,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 13:19:02,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:02,639 INFO L134 CoverageAnalysis]: Checked inductivity of 1070 backedges. 128 proven. 146 refuted. 0 times theorem prover too weak. 796 trivial. 0 not checked. [2020-07-21 13:19:02,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:03,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:03,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:03,454 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:03,531 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:03,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:03,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:03,651 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:03,744 INFO L134 CoverageAnalysis]: Checked inductivity of 1070 backedges. 129 proven. 149 refuted. 0 times theorem prover too weak. 792 trivial. 0 not checked. [2020-07-21 13:19:03,744 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1841973780] [2020-07-21 13:19:03,744 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:03,745 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 15 [2020-07-21 13:19:03,745 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954281893] [2020-07-21 13:19:03,745 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:19:03,746 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:03,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:19:03,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:19:03,746 INFO L87 Difference]: Start difference. First operand 136 states and 263 transitions. Second operand 15 states. [2020-07-21 13:19:03,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:03,984 INFO L93 Difference]: Finished difference Result 177 states and 357 transitions. [2020-07-21 13:19:03,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:19:03,985 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 201 [2020-07-21 13:19:03,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:03,988 INFO L225 Difference]: With dead ends: 177 [2020-07-21 13:19:03,988 INFO L226 Difference]: Without dead ends: 145 [2020-07-21 13:19:03,990 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 379 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 13:19:03,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2020-07-21 13:19:04,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 136. [2020-07-21 13:19:04,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-07-21 13:19:04,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 254 transitions. [2020-07-21 13:19:04,007 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 254 transitions. Word has length 201 [2020-07-21 13:19:04,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:04,007 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 254 transitions. [2020-07-21 13:19:04,007 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:19:04,007 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 254 transitions. [2020-07-21 13:19:04,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-21 13:19:04,010 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:04,010 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 13:19:04,224 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:04,225 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:04,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:04,226 INFO L82 PathProgramCache]: Analyzing trace with hash 1838391522, now seen corresponding path program 24 times [2020-07-21 13:19:04,226 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:04,226 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1398057078] [2020-07-21 13:19:04,227 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:04,486 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:04,487 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:04,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 421 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 13:19:04,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:04,584 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 13:19:04,585 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:05,100 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:05,101 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:05,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:05,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:05,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:05,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:05,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:05,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:05,629 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 13:19:05,630 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1398057078] [2020-07-21 13:19:05,630 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:05,630 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 15 [2020-07-21 13:19:05,630 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2086477972] [2020-07-21 13:19:05,631 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:19:05,631 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:05,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:19:05,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:19:05,632 INFO L87 Difference]: Start difference. First operand 136 states and 254 transitions. Second operand 15 states. [2020-07-21 13:19:05,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:05,899 INFO L93 Difference]: Finished difference Result 168 states and 320 transitions. [2020-07-21 13:19:05,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:19:05,899 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 189 [2020-07-21 13:19:05,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:05,902 INFO L225 Difference]: With dead ends: 168 [2020-07-21 13:19:05,902 INFO L226 Difference]: Without dead ends: 161 [2020-07-21 13:19:05,904 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 13:19:05,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2020-07-21 13:19:05,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 128. [2020-07-21 13:19:05,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2020-07-21 13:19:05,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 238 transitions. [2020-07-21 13:19:05,920 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 238 transitions. Word has length 189 [2020-07-21 13:19:05,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:05,920 INFO L479 AbstractCegarLoop]: Abstraction has 128 states and 238 transitions. [2020-07-21 13:19:05,920 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:19:05,921 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 238 transitions. [2020-07-21 13:19:05,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-21 13:19:05,924 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:05,924 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 13:19:06,138 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:06,139 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:06,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:06,140 INFO L82 PathProgramCache]: Analyzing trace with hash -140375518, now seen corresponding path program 25 times [2020-07-21 13:19:06,140 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:06,141 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [661775175] [2020-07-21 13:19:06,141 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:06,393 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:06,393 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:06,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 421 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 13:19:06,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:06,481 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 13:19:06,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:06,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:07,113 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:07,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:07,175 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:07,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:07,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:07,476 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 13:19:07,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [661775175] [2020-07-21 13:19:07,477 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:07,477 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 15 [2020-07-21 13:19:07,477 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778539417] [2020-07-21 13:19:07,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:19:07,478 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:07,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:19:07,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:19:07,479 INFO L87 Difference]: Start difference. First operand 128 states and 238 transitions. Second operand 15 states. [2020-07-21 13:19:07,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:07,693 INFO L93 Difference]: Finished difference Result 147 states and 264 transitions. [2020-07-21 13:19:07,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:19:07,694 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 189 [2020-07-21 13:19:07,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:07,697 INFO L225 Difference]: With dead ends: 147 [2020-07-21 13:19:07,697 INFO L226 Difference]: Without dead ends: 140 [2020-07-21 13:19:07,698 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 13:19:07,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2020-07-21 13:19:07,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 107. [2020-07-21 13:19:07,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-21 13:19:07,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 192 transitions. [2020-07-21 13:19:07,711 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 192 transitions. Word has length 189 [2020-07-21 13:19:07,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:07,711 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 192 transitions. [2020-07-21 13:19:07,711 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:19:07,712 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 192 transitions. [2020-07-21 13:19:07,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2020-07-21 13:19:07,714 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:07,714 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 13:19:07,929 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:07,930 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:07,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:07,931 INFO L82 PathProgramCache]: Analyzing trace with hash -2096855727, now seen corresponding path program 26 times [2020-07-21 13:19:07,931 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:07,932 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1586631559] [2020-07-21 13:19:07,932 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:08,215 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:08,216 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:08,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 396 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 13:19:08,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:08,321 INFO L134 CoverageAnalysis]: Checked inductivity of 796 backedges. 69 proven. 239 refuted. 0 times theorem prover too weak. 488 trivial. 0 not checked. [2020-07-21 13:19:08,321 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:09,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:09,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:09,760 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:09,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:09,905 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:09,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:09,962 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 13:19:09,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1586631559] [2020-07-21 13:19:09,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:09,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 13:19:09,963 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377445066] [2020-07-21 13:19:09,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 13:19:09,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:09,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 13:19:09,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:19:09,964 INFO L87 Difference]: Start difference. First operand 107 states and 192 transitions. Second operand 17 states. [2020-07-21 13:19:10,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:10,284 INFO L93 Difference]: Finished difference Result 168 states and 323 transitions. [2020-07-21 13:19:10,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:19:10,285 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 178 [2020-07-21 13:19:10,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:10,288 INFO L225 Difference]: With dead ends: 168 [2020-07-21 13:19:10,288 INFO L226 Difference]: Without dead ends: 104 [2020-07-21 13:19:10,290 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 327 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 13:19:10,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-07-21 13:19:10,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2020-07-21 13:19:10,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2020-07-21 13:19:10,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 148 transitions. [2020-07-21 13:19:10,300 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 148 transitions. Word has length 178 [2020-07-21 13:19:10,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:10,300 INFO L479 AbstractCegarLoop]: Abstraction has 104 states and 148 transitions. [2020-07-21 13:19:10,300 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 13:19:10,300 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 148 transitions. [2020-07-21 13:19:10,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-21 13:19:10,302 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:10,303 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 13:19:10,516 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:10,517 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:10,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:10,517 INFO L82 PathProgramCache]: Analyzing trace with hash 1148569106, now seen corresponding path program 27 times [2020-07-21 13:19:10,517 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:10,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [559093238] [2020-07-21 13:19:10,518 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:10,816 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:10,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:10,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 421 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 13:19:10,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:10,949 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 13:19:10,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:11,823 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:12,059 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:12,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:12,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:12,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:12,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:12,365 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 13:19:12,366 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [559093238] [2020-07-21 13:19:12,366 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:12,366 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 17 [2020-07-21 13:19:12,367 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240595394] [2020-07-21 13:19:12,367 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 13:19:12,367 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:12,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 13:19:12,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:19:12,368 INFO L87 Difference]: Start difference. First operand 104 states and 148 transitions. Second operand 17 states. [2020-07-21 13:19:12,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:12,642 INFO L93 Difference]: Finished difference Result 152 states and 209 transitions. [2020-07-21 13:19:12,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:19:12,643 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 189 [2020-07-21 13:19:12,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:12,645 INFO L225 Difference]: With dead ends: 152 [2020-07-21 13:19:12,646 INFO L226 Difference]: Without dead ends: 104 [2020-07-21 13:19:12,647 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 13:19:12,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-07-21 13:19:12,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 91. [2020-07-21 13:19:12,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-07-21 13:19:12,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 112 transitions. [2020-07-21 13:19:12,653 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 112 transitions. Word has length 189 [2020-07-21 13:19:12,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:12,653 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 112 transitions. [2020-07-21 13:19:12,653 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 13:19:12,653 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 112 transitions. [2020-07-21 13:19:12,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-21 13:19:12,654 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:12,655 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 13:19:12,855 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:12,856 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:12,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:12,856 INFO L82 PathProgramCache]: Analyzing trace with hash 1803358882, now seen corresponding path program 28 times [2020-07-21 13:19:12,857 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:12,857 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [881752413] [2020-07-21 13:19:12,857 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:13,122 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:13,123 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:13,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 421 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 13:19:13,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:13,231 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 13:19:13,232 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:14,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:14,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:14,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:14,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:15,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:15,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:15,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:15,223 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 13:19:15,223 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [881752413] [2020-07-21 13:19:15,224 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:15,224 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16] total 19 [2020-07-21 13:19:15,224 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775562497] [2020-07-21 13:19:15,224 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 13:19:15,224 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:15,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 13:19:15,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2020-07-21 13:19:15,225 INFO L87 Difference]: Start difference. First operand 91 states and 112 transitions. Second operand 19 states. [2020-07-21 13:19:15,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:15,534 INFO L93 Difference]: Finished difference Result 137 states and 170 transitions. [2020-07-21 13:19:15,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 13:19:15,535 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 189 [2020-07-21 13:19:15,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:15,536 INFO L225 Difference]: With dead ends: 137 [2020-07-21 13:19:15,536 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 13:19:15,541 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 347 SyntacticMatches, 13 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2020-07-21 13:19:15,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 13:19:15,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 13:19:15,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 13:19:15,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 13:19:15,542 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 189 [2020-07-21 13:19:15,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:15,542 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 13:19:15,542 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 13:19:15,542 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 13:19:15,542 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 13:19:15,743 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:15,747 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 13:19:16,476 WARN L193 SmtUtils]: Spent 503.00 ms on a formula simplification. DAG size of input: 175 DAG size of output: 59 [2020-07-21 13:19:16,883 WARN L193 SmtUtils]: Spent 404.00 ms on a formula simplification. DAG size of input: 169 DAG size of output: 59 [2020-07-21 13:19:17,040 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 139 DAG size of output: 67 [2020-07-21 13:19:17,387 WARN L193 SmtUtils]: Spent 331.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 59 [2020-07-21 13:19:17,689 WARN L193 SmtUtils]: Spent 299.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 59 [2020-07-21 13:19:18,255 WARN L193 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 169 DAG size of output: 59 [2020-07-21 13:19:18,483 WARN L193 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 44 [2020-07-21 13:19:18,746 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 44 [2020-07-21 13:19:18,900 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 169 DAG size of output: 59 [2020-07-21 13:19:19,168 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 59 [2020-07-21 13:19:19,375 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 44 [2020-07-21 13:19:19,592 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 59 [2020-07-21 13:19:19,711 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 150 DAG size of output: 38 [2020-07-21 13:19:19,891 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 59 [2020-07-21 13:19:20,033 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 169 DAG size of output: 59 [2020-07-21 13:19:20,183 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 175 DAG size of output: 59 [2020-07-21 13:19:20,329 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 162 DAG size of output: 49 [2020-07-21 13:19:20,594 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 44 [2020-07-21 13:19:20,752 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 59 [2020-07-21 13:19:21,240 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 59 [2020-07-21 13:19:21,538 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 154 DAG size of output: 49 [2020-07-21 13:19:21,689 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 59 [2020-07-21 13:19:21,802 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 49 [2020-07-21 13:19:22,113 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 59 [2020-07-21 13:19:22,313 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 67 [2020-07-21 13:19:22,437 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 45 [2020-07-21 13:19:22,707 WARN L193 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 75 [2020-07-21 13:19:22,893 WARN L193 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 186 DAG size of output: 68 [2020-07-21 13:19:23,055 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 67 [2020-07-21 13:19:23,201 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 67 [2020-07-21 13:19:23,503 WARN L193 SmtUtils]: Spent 288.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 75 [2020-07-21 13:19:23,767 WARN L193 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 75 [2020-07-21 13:19:23,976 WARN L193 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 189 DAG size of output: 72 [2020-07-21 13:19:24,107 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 193 DAG size of output: 75 [2020-07-21 13:19:24,288 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 186 DAG size of output: 68 [2020-07-21 13:19:24,415 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 45 [2020-07-21 13:19:24,683 WARN L193 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 75 [2020-07-21 13:19:24,972 WARN L193 SmtUtils]: Spent 287.00 ms on a formula simplification. DAG size of input: 204 DAG size of output: 71 [2020-07-21 13:19:25,262 WARN L193 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 75 [2020-07-21 13:19:25,511 WARN L193 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 211 DAG size of output: 73 [2020-07-21 13:19:25,635 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 45 [2020-07-21 13:19:25,783 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 67 [2020-07-21 13:19:26,083 WARN L193 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 75 [2020-07-21 13:19:26,203 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 44 [2020-07-21 13:19:26,483 WARN L193 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 75 [2020-07-21 13:19:26,749 WARN L193 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 204 DAG size of output: 71 [2020-07-21 13:19:26,872 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 51 [2020-07-21 13:19:27,152 WARN L193 SmtUtils]: Spent 278.00 ms on a formula simplification. DAG size of input: 204 DAG size of output: 71 [2020-07-21 13:19:27,438 WARN L193 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 204 DAG size of output: 71 [2020-07-21 13:19:27,711 WARN L193 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 75 [2020-07-21 13:19:27,952 WARN L193 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 211 DAG size of output: 73 [2020-07-21 13:19:28,162 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 189 DAG size of output: 72 [2020-07-21 13:19:28,536 WARN L193 SmtUtils]: Spent 372.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 90 [2020-07-21 13:19:28,807 WARN L193 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 75 [2020-07-21 13:19:28,930 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 51 [2020-07-21 13:19:29,055 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 45 [2020-07-21 13:19:29,165 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 44 [2020-07-21 13:19:29,769 WARN L193 SmtUtils]: Spent 569.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 29 [2020-07-21 13:19:30,658 WARN L193 SmtUtils]: Spent 864.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 31 [2020-07-21 13:19:30,664 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 13:19:30,665 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 13:19:30,665 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 13:19:30,665 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 13:19:30,665 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 13:19:30,665 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 13:19:30,665 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 39) no Hoare annotation was computed. [2020-07-21 13:19:30,666 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 35 42) the Hoare annotation is: true [2020-07-21 13:19:30,666 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 35 42) no Hoare annotation was computed. [2020-07-21 13:19:30,666 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 35 42) no Hoare annotation was computed. [2020-07-21 13:19:30,666 INFO L268 CegarLoopResult]: For program point L39(line 39) no Hoare annotation was computed. [2020-07-21 13:19:30,666 INFO L268 CegarLoopResult]: For program point L38(lines 38 40) no Hoare annotation was computed. [2020-07-21 13:19:30,666 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 13:19:30,666 INFO L268 CegarLoopResult]: For program point L37-1(line 37) no Hoare annotation was computed. [2020-07-21 13:19:30,666 INFO L268 CegarLoopResult]: For program point L38-2(lines 38 40) no Hoare annotation was computed. [2020-07-21 13:19:30,666 INFO L271 CegarLoopResult]: At program point fibo2ENTRY(lines 17 25) the Hoare annotation is: true [2020-07-21 13:19:30,667 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 13:19:30,667 INFO L268 CegarLoopResult]: For program point L23-1(line 23) no Hoare annotation was computed. [2020-07-21 13:19:30,667 INFO L264 CegarLoopResult]: At program point L23-2(line 23) the Hoare annotation is: (let ((.cse0 (<= fibo2_~n |fibo2_#in~n|)) (.cse2 (= 1 |fibo2_#t~ret2|)) (.cse1 (<= |fibo2_#in~n| fibo2_~n))) (or (and .cse0 .cse1 (<= 4 |fibo2_#in~n|) (<= |fibo2_#in~n| 4) (= 2 |fibo2_#t~ret2|)) (and .cse0 (= 3 |fibo2_#t~ret2|) (<= 5 |fibo2_#in~n|) .cse1) (and .cse0 (<= 3 |fibo2_#in~n|) .cse2 .cse1 (<= |fibo2_#in~n| 3)) (and .cse0 .cse1 (<= 6 |fibo2_#in~n|)) (and .cse0 (<= |fibo2_#in~n| 2) .cse2 .cse1 (<= 2 |fibo2_#in~n|)))) [2020-07-21 13:19:30,667 INFO L268 CegarLoopResult]: For program point L20(lines 20 24) no Hoare annotation was computed. [2020-07-21 13:19:30,667 INFO L268 CegarLoopResult]: For program point L23-3(line 23) no Hoare annotation was computed. [2020-07-21 13:19:30,667 INFO L268 CegarLoopResult]: For program point L18(lines 18 24) no Hoare annotation was computed. [2020-07-21 13:19:30,667 INFO L268 CegarLoopResult]: For program point fibo2FINAL(lines 17 25) no Hoare annotation was computed. [2020-07-21 13:19:30,668 INFO L268 CegarLoopResult]: For program point fibo2EXIT(lines 17 25) no Hoare annotation was computed. [2020-07-21 13:19:30,668 INFO L271 CegarLoopResult]: At program point fibo1ENTRY(lines 7 15) the Hoare annotation is: true [2020-07-21 13:19:30,668 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 13:19:30,668 INFO L268 CegarLoopResult]: For program point L13-1(line 13) no Hoare annotation was computed. [2020-07-21 13:19:30,668 INFO L264 CegarLoopResult]: At program point L13-2(line 13) the Hoare annotation is: (and (<= fibo1_~n |fibo1_#in~n|) (let ((.cse0 (= 1 |fibo1_#t~ret0|))) (or (<= 5 |fibo1_#in~n|) (and (= 2 |fibo1_#t~ret0|) (<= 4 |fibo1_#in~n|)) (and (<= 2 |fibo1_#in~n|) (<= |fibo1_#in~n| 2) .cse0) (and (<= 3 |fibo1_#in~n|) .cse0 (<= |fibo1_#in~n| 3)))) (let ((.cse1 (<= |fibo1_#in~n| fibo1_~n))) (or (and (<= 7 |fibo1_#in~n|) .cse1) (and (<= |fibo1_#in~n| 5) .cse1) (and (= 5 |fibo1_#t~ret0|) .cse1)))) [2020-07-21 13:19:30,669 INFO L268 CegarLoopResult]: For program point fibo1FINAL(lines 7 15) no Hoare annotation was computed. [2020-07-21 13:19:30,669 INFO L268 CegarLoopResult]: For program point L10(lines 10 14) no Hoare annotation was computed. [2020-07-21 13:19:30,669 INFO L268 CegarLoopResult]: For program point L13-3(line 13) no Hoare annotation was computed. [2020-07-21 13:19:30,669 INFO L268 CegarLoopResult]: For program point L8(lines 8 14) no Hoare annotation was computed. [2020-07-21 13:19:30,669 INFO L268 CegarLoopResult]: For program point fibo1EXIT(lines 7 15) no Hoare annotation was computed. [2020-07-21 13:19:30,675 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 01:19:30 BoogieIcfgContainer [2020-07-21 13:19:30,675 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 13:19:30,676 INFO L168 Benchmark]: Toolchain (without parser) took 86781.44 ms. Allocated memory was 137.9 MB in the beginning and 971.5 MB in the end (delta: 833.6 MB). Free memory was 101.1 MB in the beginning and 724.7 MB in the end (delta: -623.6 MB). Peak memory consumption was 823.3 MB. Max. memory is 7.1 GB. [2020-07-21 13:19:30,677 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 137.9 MB. Free memory was 119.7 MB in the beginning and 119.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 13:19:30,677 INFO L168 Benchmark]: CACSL2BoogieTranslator took 296.48 ms. Allocated memory is still 137.9 MB. Free memory was 100.9 MB in the beginning and 91.2 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. [2020-07-21 13:19:30,678 INFO L168 Benchmark]: Boogie Preprocessor took 143.08 ms. Allocated memory was 137.9 MB in the beginning and 203.4 MB in the end (delta: 65.5 MB). Free memory was 91.2 MB in the beginning and 181.9 MB in the end (delta: -90.7 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. [2020-07-21 13:19:30,678 INFO L168 Benchmark]: RCFGBuilder took 283.32 ms. Allocated memory is still 203.4 MB. Free memory was 181.9 MB in the beginning and 169.3 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 7.1 GB. [2020-07-21 13:19:30,679 INFO L168 Benchmark]: TraceAbstraction took 86050.85 ms. Allocated memory was 203.4 MB in the beginning and 971.5 MB in the end (delta: 768.1 MB). Free memory was 168.6 MB in the beginning and 724.7 MB in the end (delta: -556.1 MB). Peak memory consumption was 825.3 MB. Max. memory is 7.1 GB. [2020-07-21 13:19:30,686 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 137.9 MB. Free memory was 119.7 MB in the beginning and 119.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 296.48 ms. Allocated memory is still 137.9 MB. Free memory was 100.9 MB in the beginning and 91.2 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 143.08 ms. Allocated memory was 137.9 MB in the beginning and 203.4 MB in the end (delta: 65.5 MB). Free memory was 91.2 MB in the beginning and 181.9 MB in the end (delta: -90.7 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 283.32 ms. Allocated memory is still 203.4 MB. Free memory was 181.9 MB in the beginning and 169.3 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 86050.85 ms. Allocated memory was 203.4 MB in the beginning and 971.5 MB in the end (delta: 768.1 MB). Free memory was 168.6 MB in the beginning and 724.7 MB in the end (delta: -556.1 MB). Peak memory consumption was 825.3 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: 71.0s, OverallIterations: 41, TraceHistogramMax: 18, AutomataDifference: 10.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 14.9s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1220 SDtfs, 1493 SDslu, 8510 SDs, 0 SdLazy, 7687 SolverSat, 1105 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 5.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 12090 GetRequests, 11014 SyntacticMatches, 375 SemanticMatches, 701 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2387 ImplicationChecksByTransitivity, 9.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=154occurred in iteration=28, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.5s AutomataMinimizationTime, 41 MinimizatonAttempts, 720 StatesRemovedByMinimization, 35 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 11 LocationsWithAnnotation, 263 PreInvPairs, 6507 NumberOfFragments, 162 HoareAnnotationTreeSize, 263 FomulaSimplifications, 1006006810 FormulaSimplificationTreeSizeReduction, 13.4s HoareSimplificationTime, 11 FomulaSimplificationsInter, 36730 FormulaSimplificationTreeSizeReductionInter, 1.4s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.3s SsaConstructionTime, 1.6s SatisfiabilityAnalysisTime, 44.7s InterpolantComputationTime, 5979 NumberOfCodeBlocks, 5979 NumberOfCodeBlocksAsserted, 82 NumberOfCheckSat, 11851 ConstructedInterpolants, 0 QuantifiedInterpolants, 3320193 SizeOfPredicates, 214 NumberOfNonLiveVariables, 13328 ConjunctsInSsa, 539 ConjunctsInUnsatCore, 80 InterpolantComputations, 2 PerfectInterpolantSequences, 43527/52326 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...