/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 DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_10-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 21:22:45,010 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-20 21:22:45,034 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 21:22:45,035 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 21:22:45,037 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 21:22:45,039 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 21:22:45,041 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 21:22:45,043 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 21:22:45,044 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 21:22:45,045 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 21:22:45,046 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 21:22:45,047 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 21:22:45,049 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 21:22:45,050 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 21:22:45,051 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 21:22:45,053 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 21:22:45,055 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 21:22:45,058 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 21:22:45,060 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 21:22:45,061 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 21:22:45,063 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 21:22:45,064 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 21:22:45,067 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 21:22:45,078 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 21:22:45,079 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 21:22:45,080 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 21:22:45,081 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 21:22:45,098 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 21:22:45,098 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 21:22:45,100 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 21:22:45,100 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 21:22:45,101 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 21:22:45,101 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 21:22:45,101 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 21:22:45,101 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 21:22:45,102 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 21:22:45,102 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 21:22:45,102 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 21:22:45,102 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 21:22:45,102 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 21:22:45,103 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 21:22:45,103 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 21:22:45,103 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 21:22:45,103 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 21:22:45,103 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 21:22:45,104 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 21:22:45,104 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 21:22:45,104 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 21:22:45,104 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:22:45,105 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 21:22:45,105 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 21:22:45,105 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 21:22:45,105 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 21:22:45,105 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:45,105 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 21:22:45,106 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 21:22:45,106 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 -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 21:22:45,428 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 21:22:45,451 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 21:22:45,457 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 21:22:45,459 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 21:22:45,459 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 21:22:45,460 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_10-2.c [2020-07-20 21:22:45,557 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/237cd551d/06d4e1d6ec3741e39924174608ef84c3/FLAGbcd1591c0 [2020-07-20 21:22:46,092 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 21:22:46,093 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_10-2.c [2020-07-20 21:22:46,101 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/237cd551d/06d4e1d6ec3741e39924174608ef84c3/FLAGbcd1591c0 [2020-07-20 21:22:46,477 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/237cd551d/06d4e1d6ec3741e39924174608ef84c3 [2020-07-20 21:22:46,487 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 21:22:46,491 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 21:22:46,492 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 21:22:46,493 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 21:22:46,497 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 21:22:46,499 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:22:46" (1/1) ... [2020-07-20 21:22:46,503 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3038eeeb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:46, skipping insertion in model container [2020-07-20 21:22:46,503 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:22:46" (1/1) ... [2020-07-20 21:22:46,513 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 21:22:46,534 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 21:22:46,741 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:22:46,747 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 21:22:46,767 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:22:46,783 INFO L208 MainTranslator]: Completed translation [2020-07-20 21:22:46,783 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:46 WrapperNode [2020-07-20 21:22:46,783 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 21:22:46,784 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 21:22:46,784 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 21:22:46,784 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 21:22:46,796 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:46" (1/1) ... [2020-07-20 21:22:46,797 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:46" (1/1) ... [2020-07-20 21:22:46,803 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:46" (1/1) ... [2020-07-20 21:22:46,803 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:46" (1/1) ... [2020-07-20 21:22:46,894 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:46" (1/1) ... [2020-07-20 21:22:46,897 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:46" (1/1) ... [2020-07-20 21:22:46,899 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:46" (1/1) ... [2020-07-20 21:22:46,901 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 21:22:46,902 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 21:22:46,902 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 21:22:46,902 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 21:22:46,903 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:46" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:22:46,988 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 21:22:46,989 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 21:22:46,989 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 21:22:46,989 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 21:22:46,990 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 21:22:46,990 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 21:22:46,990 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 21:22:46,991 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 21:22:46,991 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 21:22:46,991 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 21:22:46,991 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 21:22:46,991 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 21:22:47,222 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 21:22:47,223 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 21:22:47,233 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:22:47 BoogieIcfgContainer [2020-07-20 21:22:47,233 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 21:22:47,235 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 21:22:47,236 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 21:22:47,240 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 21:22:47,240 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:22:46" (1/3) ... [2020-07-20 21:22:47,241 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3076ba80 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:22:47, skipping insertion in model container [2020-07-20 21:22:47,241 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:46" (2/3) ... [2020-07-20 21:22:47,242 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3076ba80 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:22:47, skipping insertion in model container [2020-07-20 21:22:47,242 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:22:47" (3/3) ... [2020-07-20 21:22:47,247 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_10-2.c [2020-07-20 21:22:47,268 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 21:22:47,279 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 21:22:47,301 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 21:22:47,338 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 21:22:47,338 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 21:22:47,338 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 21:22:47,339 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 21:22:47,339 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 21:22:47,339 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 21:22:47,339 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 21:22:47,340 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 21:22:47,366 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 21:22:47,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 21:22:47,376 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:47,377 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:47,378 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:47,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:47,386 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 21:22:47,397 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:47,398 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [356797252] [2020-07-20 21:22:47,398 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:47,527 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:22:47,528 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:47,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:22:47,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:47,644 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:22:47,644 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:22:47,648 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [356797252] [2020-07-20 21:22:47,649 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:22:47,649 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:22:47,651 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111154032] [2020-07-20 21:22:47,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:22:47,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:47,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:22:47,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:22:47,676 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 21:22:47,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:47,809 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 21:22:47,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:22:47,811 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 21:22:47,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:47,826 INFO L225 Difference]: With dead ends: 44 [2020-07-20 21:22:47,826 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 21:22:47,831 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 21:22:47,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 21:22:47,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 21:22:47,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 21:22:47,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 21:22:47,891 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 21:22:47,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:47,892 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 21:22:47,892 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:22:47,892 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 21:22:47,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 21:22:47,895 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:47,895 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:48,111 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:48,112 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:48,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:48,113 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 21:22:48,114 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:48,114 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [158428462] [2020-07-20 21:22:48,115 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:48,141 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:22:48,142 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:48,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:22:48,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:48,206 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:22:48,207 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:22:48,207 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [158428462] [2020-07-20 21:22:48,208 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:22:48,208 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:22:48,208 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700648040] [2020-07-20 21:22:48,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:22:48,211 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:48,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:22:48,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:22:48,212 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 21:22:48,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:48,292 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 21:22:48,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:22:48,293 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 21:22:48,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:48,295 INFO L225 Difference]: With dead ends: 36 [2020-07-20 21:22:48,295 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 21:22:48,297 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 21:22:48,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 21:22:48,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 21:22:48,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 21:22:48,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 21:22:48,308 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 21:22:48,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:48,309 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 21:22:48,309 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:22:48,309 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 21:22:48,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 21:22:48,311 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:48,312 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] [2020-07-20 21:22:48,526 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:48,528 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:48,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:48,529 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 21:22:48,530 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:48,531 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2065095007] [2020-07-20 21:22:48,531 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:48,566 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:22:48,567 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:48,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:22:48,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:48,664 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 21:22:48,664 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:48,905 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:48,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:48,989 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 21:22:48,990 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2065095007] [2020-07-20 21:22:48,990 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:48,992 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 21:22:48,993 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238911849] [2020-07-20 21:22:48,994 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 21:22:48,995 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:48,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 21:22:49,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 21:22:49,000 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 21:22:49,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:49,195 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 21:22:49,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:22:49,197 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 21:22:49,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:49,200 INFO L225 Difference]: With dead ends: 41 [2020-07-20 21:22:49,200 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 21:22:49,203 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 [2020-07-20 21:22:49,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 21:22:49,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 21:22:49,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 21:22:49,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 21:22:49,230 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 21:22:49,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:49,231 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 21:22:49,231 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 21:22:49,231 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 21:22:49,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 21:22:49,235 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:49,236 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] [2020-07-20 21:22:49,449 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:49,450 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:49,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:49,451 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 21:22:49,451 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:49,452 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [618060638] [2020-07-20 21:22:49,452 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:49,492 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:22:49,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:49,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:22:49,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:49,557 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 21:22:49,558 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:49,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:49,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:49,777 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 21:22:49,778 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [618060638] [2020-07-20 21:22:49,779 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:49,779 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 21:22:49,779 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437511494] [2020-07-20 21:22:49,780 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 21:22:49,780 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:49,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 21:22:49,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 21:22:49,781 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 21:22:49,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:49,957 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 21:22:49,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:22:49,957 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 21:22:49,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:49,960 INFO L225 Difference]: With dead ends: 46 [2020-07-20 21:22:49,960 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 21:22:49,961 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 [2020-07-20 21:22:49,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 21:22:49,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 21:22:49,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 21:22:49,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 21:22:49,971 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 21:22:49,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:49,972 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 21:22:49,972 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 21:22:49,972 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 21:22:49,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 21:22:49,974 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:49,974 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] [2020-07-20 21:22:50,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:50,188 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:50,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:50,189 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 21:22:50,190 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:50,190 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [781829014] [2020-07-20 21:22:50,191 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:50,228 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:50,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:50,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:22:50,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:50,304 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 21:22:50,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:50,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:50,677 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:50,679 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:50,734 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 21:22:50,735 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [781829014] [2020-07-20 21:22:50,735 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:50,735 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 21:22:50,736 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1792594984] [2020-07-20 21:22:50,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 21:22:50,737 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:50,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 21:22:50,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 21:22:50,738 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 21:22:50,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:50,946 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 21:22:50,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:22:50,946 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 21:22:50,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:50,948 INFO L225 Difference]: With dead ends: 51 [2020-07-20 21:22:50,948 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 21:22:50,949 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:22:50,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 21:22:50,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 21:22:50,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 21:22:50,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 21:22:50,961 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 21:22:50,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:50,962 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 21:22:50,962 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 21:22:50,962 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 21:22:50,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 21:22:50,964 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:50,965 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] [2020-07-20 21:22:51,169 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:51,171 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:51,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:51,172 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 21:22:51,172 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:51,173 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1014774721] [2020-07-20 21:22:51,174 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:51,209 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:51,210 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:51,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:22:51,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:51,269 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 21:22:51,270 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:51,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:51,583 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:51,584 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:51,623 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 21:22:51,624 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1014774721] [2020-07-20 21:22:51,624 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:51,624 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 21:22:51,625 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169387302] [2020-07-20 21:22:51,625 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 21:22:51,626 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:51,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 21:22:51,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 21:22:51,626 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-20 21:22:51,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:51,821 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-20 21:22:51,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:22:51,822 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 21:22:51,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:51,824 INFO L225 Difference]: With dead ends: 56 [2020-07-20 21:22:51,825 INFO L226 Difference]: Without dead ends: 52 [2020-07-20 21:22:51,826 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 [2020-07-20 21:22:51,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-20 21:22:51,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-20 21:22:51,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 21:22:51,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 21:22:51,837 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-20 21:22:51,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:51,838 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 21:22:51,838 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 21:22:51,838 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 21:22:51,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-20 21:22:51,841 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:51,841 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] [2020-07-20 21:22:52,056 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:52,057 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:52,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:52,058 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-20 21:22:52,058 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:52,059 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [255513028] [2020-07-20 21:22:52,059 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:52,113 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:52,113 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:52,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:22:52,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:52,189 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 21:22:52,190 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:52,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,821 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 21:22:52,822 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [255513028] [2020-07-20 21:22:52,822 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:52,823 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 21:22:52,823 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128025824] [2020-07-20 21:22:52,824 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 21:22:52,824 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:52,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 21:22:52,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:22:52,826 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 14 states. [2020-07-20 21:22:53,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:53,081 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-20 21:22:53,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:22:53,082 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-07-20 21:22:53,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:53,084 INFO L225 Difference]: With dead ends: 61 [2020-07-20 21:22:53,084 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 21:22:53,085 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 [2020-07-20 21:22:53,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 21:22:53,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-20 21:22:53,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 21:22:53,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 21:22:53,100 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-20 21:22:53,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:53,101 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 21:22:53,101 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 21:22:53,101 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 21:22:53,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-20 21:22:53,110 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:53,110 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] [2020-07-20 21:22:53,311 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:53,311 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:53,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:53,312 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-20 21:22:53,312 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:53,313 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2132636288] [2020-07-20 21:22:53,313 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:53,356 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:53,357 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:53,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:22:53,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:53,427 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-07-20 21:22:53,428 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:53,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:53,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:53,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:53,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:53,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:54,002 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 21:22:54,003 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2132636288] [2020-07-20 21:22:54,003 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:54,004 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 21:22:54,005 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798081196] [2020-07-20 21:22:54,006 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 21:22:54,007 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:54,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 21:22:54,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:22:54,009 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 14 states. [2020-07-20 21:22:54,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:54,259 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2020-07-20 21:22:54,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:22:54,260 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 54 [2020-07-20 21:22:54,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:54,264 INFO L225 Difference]: With dead ends: 66 [2020-07-20 21:22:54,264 INFO L226 Difference]: Without dead ends: 62 [2020-07-20 21:22:54,265 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 90 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 21:22:54,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-20 21:22:54,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 45. [2020-07-20 21:22:54,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 21:22:54,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 21:22:54,279 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 54 [2020-07-20 21:22:54,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:54,279 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 21:22:54,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 21:22:54,280 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 21:22:54,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 21:22:54,281 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:54,282 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] [2020-07-20 21:22:54,497 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:54,498 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:54,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:54,498 INFO L82 PathProgramCache]: Analyzing trace with hash -975547772, now seen corresponding path program 3 times [2020-07-20 21:22:54,499 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:54,499 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2108577912] [2020-07-20 21:22:54,499 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:54,562 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:54,563 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:54,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:22:54,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:54,670 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 60 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-20 21:22:54,670 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:55,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:55,273 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:55,426 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:55,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:55,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:55,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:55,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:55,628 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 68 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-07-20 21:22:55,629 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2108577912] [2020-07-20 21:22:55,630 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:55,630 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 21:22:55,630 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1240603858] [2020-07-20 21:22:55,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 21:22:55,631 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:55,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 21:22:55,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 21:22:55,632 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 16 states. [2020-07-20 21:22:55,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:55,917 INFO L93 Difference]: Finished difference Result 71 states and 124 transitions. [2020-07-20 21:22:55,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:22:55,917 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 78 [2020-07-20 21:22:55,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:55,920 INFO L225 Difference]: With dead ends: 71 [2020-07-20 21:22:55,920 INFO L226 Difference]: Without dead ends: 67 [2020-07-20 21:22:55,922 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 [2020-07-20 21:22:55,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-20 21:22:55,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 50. [2020-07-20 21:22:55,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 21:22:55,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 21:22:55,935 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 78 [2020-07-20 21:22:55,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:55,936 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 21:22:55,936 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 21:22:55,936 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 21:22:55,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-20 21:22:55,938 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:55,938 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] [2020-07-20 21:22:56,152 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:56,153 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:56,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:56,154 INFO L82 PathProgramCache]: Analyzing trace with hash 1891337214, now seen corresponding path program 2 times [2020-07-20 21:22:56,155 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:56,155 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1488615233] [2020-07-20 21:22:56,156 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:56,226 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:56,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:56,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:22:56,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:56,319 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 115 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-20 21:22:56,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:56,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:57,100 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:57,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:57,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:57,292 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 125 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-20 21:22:57,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1488615233] [2020-07-20 21:22:57,293 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:57,293 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 21:22:57,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444437348] [2020-07-20 21:22:57,296 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 21:22:57,296 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:57,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 21:22:57,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 21:22:57,298 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 16 states. [2020-07-20 21:22:57,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:57,577 INFO L93 Difference]: Finished difference Result 76 states and 140 transitions. [2020-07-20 21:22:57,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:22:57,578 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 108 [2020-07-20 21:22:57,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:57,580 INFO L225 Difference]: With dead ends: 76 [2020-07-20 21:22:57,581 INFO L226 Difference]: Without dead ends: 72 [2020-07-20 21:22:57,583 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 192 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:22:57,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-20 21:22:57,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-20 21:22:57,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 21:22:57,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 21:22:57,611 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 108 [2020-07-20 21:22:57,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:57,612 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 21:22:57,612 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 21:22:57,612 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 21:22:57,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2020-07-20 21:22:57,618 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:57,619 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] [2020-07-20 21:22:57,831 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:57,832 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:57,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:57,833 INFO L82 PathProgramCache]: Analyzing trace with hash -815433282, now seen corresponding path program 4 times [2020-07-20 21:22:57,834 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:57,834 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1892600280] [2020-07-20 21:22:57,834 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:57,929 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:57,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:57,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 21:22:57,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:58,037 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 332 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2020-07-20 21:22:58,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:59,077 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,682 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 346 refuted. 0 times theorem prover too weak. 786 trivial. 0 not checked. [2020-07-20 21:22:59,683 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1892600280] [2020-07-20 21:22:59,683 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:59,683 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 21:22:59,684 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394387619] [2020-07-20 21:22:59,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 21:22:59,685 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:59,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 21:22:59,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 21:22:59,685 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 18 states. [2020-07-20 21:23:00,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:00,024 INFO L93 Difference]: Finished difference Result 81 states and 156 transitions. [2020-07-20 21:23:00,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:23:00,025 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 208 [2020-07-20 21:23:00,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:00,027 INFO L225 Difference]: With dead ends: 81 [2020-07-20 21:23:00,027 INFO L226 Difference]: Without dead ends: 77 [2020-07-20 21:23:00,031 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 389 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 21:23:00,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-07-20 21:23:00,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 55. [2020-07-20 21:23:00,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 21:23:00,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-20 21:23:00,043 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 208 [2020-07-20 21:23:00,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:00,044 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-20 21:23:00,044 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 21:23:00,044 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-20 21:23:00,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 21:23:00,046 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:00,046 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 5, 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] [2020-07-20 21:23:00,253 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:00,254 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:00,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:00,255 INFO L82 PathProgramCache]: Analyzing trace with hash 1180347891, now seen corresponding path program 2 times [2020-07-20 21:23:00,255 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:00,256 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [689732156] [2020-07-20 21:23:00,256 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:00,338 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:00,338 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:00,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 21:23:00,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:00,415 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 149 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2020-07-20 21:23:00,416 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:01,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:01,583 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:01,584 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:01,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:01,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:01,829 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:01,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:01,950 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 165 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2020-07-20 21:23:01,951 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [689732156] [2020-07-20 21:23:01,951 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:01,952 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 21:23:01,952 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753184340] [2020-07-20 21:23:01,953 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 21:23:01,954 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:01,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 21:23:01,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 21:23:01,955 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 18 states. [2020-07-20 21:23:02,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:02,267 INFO L93 Difference]: Finished difference Result 86 states and 174 transitions. [2020-07-20 21:23:02,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:23:02,267 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 121 [2020-07-20 21:23:02,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:02,269 INFO L225 Difference]: With dead ends: 86 [2020-07-20 21:23:02,270 INFO L226 Difference]: Without dead ends: 82 [2020-07-20 21:23:02,271 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 214 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 21:23:02,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-20 21:23:02,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 55. [2020-07-20 21:23:02,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 21:23:02,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-20 21:23:02,282 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 121 [2020-07-20 21:23:02,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:02,282 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-20 21:23:02,282 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 21:23:02,283 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-20 21:23:02,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2020-07-20 21:23:02,285 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:02,286 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 11, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:02,500 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:02,501 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:02,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:02,502 INFO L82 PathProgramCache]: Analyzing trace with hash 2099307065, now seen corresponding path program 5 times [2020-07-20 21:23:02,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:02,503 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [731727359] [2020-07-20 21:23:02,503 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:02,626 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:02,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:02,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 371 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 21:23:02,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:02,772 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 331 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2020-07-20 21:23:02,772 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:04,233 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:04,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:04,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:04,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:04,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:05,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:05,115 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:05,221 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:05,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:05,273 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:05,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:05,337 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 352 refuted. 0 times theorem prover too weak. 609 trivial. 0 not checked. [2020-07-20 21:23:05,337 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [731727359] [2020-07-20 21:23:05,337 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:05,338 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 21:23:05,338 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371809208] [2020-07-20 21:23:05,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 21:23:05,339 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:05,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 21:23:05,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:23:05,340 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 20 states. [2020-07-20 21:23:05,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:05,784 INFO L93 Difference]: Finished difference Result 91 states and 192 transitions. [2020-07-20 21:23:05,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 21:23:05,785 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 195 [2020-07-20 21:23:05,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:05,788 INFO L225 Difference]: With dead ends: 91 [2020-07-20 21:23:05,789 INFO L226 Difference]: Without dead ends: 87 [2020-07-20 21:23:05,790 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 359 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 21:23:05,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-07-20 21:23:05,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 60. [2020-07-20 21:23:05,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 21:23:05,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-20 21:23:05,801 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 195 [2020-07-20 21:23:05,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:05,802 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-20 21:23:05,802 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 21:23:05,802 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-20 21:23:05,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-20 21:23:05,805 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:05,805 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 12, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:06,029 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:06,030 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:06,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:06,031 INFO L82 PathProgramCache]: Analyzing trace with hash 266210309, now seen corresponding path program 3 times [2020-07-20 21:23:06,031 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:06,032 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [123869068] [2020-07-20 21:23:06,032 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:06,166 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:06,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:06,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 21:23:06,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:06,319 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 347 refuted. 0 times theorem prover too weak. 658 trivial. 0 not checked. [2020-07-20 21:23:06,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:07,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:08,299 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:08,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:08,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:08,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:08,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:08,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:08,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:09,014 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 371 refuted. 0 times theorem prover too weak. 634 trivial. 0 not checked. [2020-07-20 21:23:09,015 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [123869068] [2020-07-20 21:23:09,015 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:09,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 21:23:09,015 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873118086] [2020-07-20 21:23:09,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 21:23:09,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:09,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 21:23:09,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:23:09,017 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 20 states. [2020-07-20 21:23:09,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:09,420 INFO L93 Difference]: Finished difference Result 96 states and 212 transitions. [2020-07-20 21:23:09,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 21:23:09,421 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 201 [2020-07-20 21:23:09,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:09,427 INFO L225 Difference]: With dead ends: 96 [2020-07-20 21:23:09,428 INFO L226 Difference]: Without dead ends: 92 [2020-07-20 21:23:09,429 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 370 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 21:23:09,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-07-20 21:23:09,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 60. [2020-07-20 21:23:09,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 21:23:09,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-20 21:23:09,445 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 201 [2020-07-20 21:23:09,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:09,447 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-20 21:23:09,447 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 21:23:09,447 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-20 21:23:09,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 352 [2020-07-20 21:23:09,454 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:09,454 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 22, 21, 21, 16, 16, 16, 16, 16, 16, 16, 16, 10, 10, 10, 10, 10, 10, 10, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:09,669 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:09,670 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:09,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:09,671 INFO L82 PathProgramCache]: Analyzing trace with hash -865443995, now seen corresponding path program 6 times [2020-07-20 21:23:09,671 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:09,672 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [433901295] [2020-07-20 21:23:09,672 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:09,859 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:09,859 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:09,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 665 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:23:09,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:10,053 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 819 refuted. 0 times theorem prover too weak. 2713 trivial. 0 not checked. [2020-07-20 21:23:10,053 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:12,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:12,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:13,029 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:13,030 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:13,448 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:13,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:13,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:13,701 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:13,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:13,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:14,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:14,131 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 849 refuted. 0 times theorem prover too weak. 2683 trivial. 0 not checked. [2020-07-20 21:23:14,132 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [433901295] [2020-07-20 21:23:14,132 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:14,132 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-20 21:23:14,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16109651] [2020-07-20 21:23:14,133 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 21:23:14,133 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:14,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 21:23:14,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-20 21:23:14,134 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 22 states. [2020-07-20 21:23:14,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:14,637 INFO L93 Difference]: Finished difference Result 101 states and 232 transitions. [2020-07-20 21:23:14,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:23:14,639 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 351 [2020-07-20 21:23:14,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:14,644 INFO L225 Difference]: With dead ends: 101 [2020-07-20 21:23:14,645 INFO L226 Difference]: Without dead ends: 97 [2020-07-20 21:23:14,646 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 711 GetRequests, 667 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-20 21:23:14,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-20 21:23:14,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 65. [2020-07-20 21:23:14,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-20 21:23:14,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 114 transitions. [2020-07-20 21:23:14,671 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 114 transitions. Word has length 351 [2020-07-20 21:23:14,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:14,674 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 114 transitions. [2020-07-20 21:23:14,674 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 21:23:14,674 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 114 transitions. [2020-07-20 21:23:14,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 338 [2020-07-20 21:23:14,681 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:14,682 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 22, 21, 21, 14, 14, 14, 14, 14, 14, 14, 14, 12, 10, 10, 10, 10, 10, 10, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:14,896 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:14,897 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:14,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:14,897 INFO L82 PathProgramCache]: Analyzing trace with hash 1413996641, now seen corresponding path program 3 times [2020-07-20 21:23:14,897 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:14,898 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1078705693] [2020-07-20 21:23:14,898 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:15,105 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:15,105 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:15,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 637 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:23:15,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:15,265 INFO L134 CoverageAnalysis]: Checked inductivity of 3218 backedges. 137 proven. 762 refuted. 0 times theorem prover too weak. 2319 trivial. 0 not checked. [2020-07-20 21:23:15,265 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:17,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:17,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:18,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:18,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:18,941 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:19,113 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:19,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:19,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:19,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:19,393 INFO L134 CoverageAnalysis]: Checked inductivity of 3218 backedges. 137 proven. 795 refuted. 0 times theorem prover too weak. 2286 trivial. 0 not checked. [2020-07-20 21:23:19,394 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1078705693] [2020-07-20 21:23:19,395 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:19,395 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-20 21:23:19,395 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453858089] [2020-07-20 21:23:19,398 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 21:23:19,398 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:19,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 21:23:19,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-20 21:23:19,399 INFO L87 Difference]: Start difference. First operand 65 states and 114 transitions. Second operand 22 states. [2020-07-20 21:23:19,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:19,930 INFO L93 Difference]: Finished difference Result 106 states and 254 transitions. [2020-07-20 21:23:19,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:23:19,931 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 337 [2020-07-20 21:23:19,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:19,934 INFO L225 Difference]: With dead ends: 106 [2020-07-20 21:23:19,934 INFO L226 Difference]: Without dead ends: 102 [2020-07-20 21:23:19,937 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 638 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-20 21:23:19,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-07-20 21:23:19,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 65. [2020-07-20 21:23:19,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-20 21:23:19,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 114 transitions. [2020-07-20 21:23:19,956 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 114 transitions. Word has length 337 [2020-07-20 21:23:19,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:19,959 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 114 transitions. [2020-07-20 21:23:19,959 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 21:23:19,959 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 114 transitions. [2020-07-20 21:23:19,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 820 [2020-07-20 21:23:19,967 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:19,968 INFO L422 BasicCegarLoop]: trace histogram [73, 73, 52, 52, 47, 36, 36, 36, 36, 36, 36, 36, 36, 26, 26, 26, 26, 26, 26, 26, 26, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:20,181 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:20,182 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:20,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:20,183 INFO L82 PathProgramCache]: Analyzing trace with hash -1230346157, now seen corresponding path program 7 times [2020-07-20 21:23:20,184 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:20,184 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1692085686] [2020-07-20 21:23:20,184 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:20,569 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:20,570 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:20,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 1547 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:23:20,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:21,053 INFO L134 CoverageAnalysis]: Checked inductivity of 20591 backedges. 373 proven. 2371 refuted. 0 times theorem prover too weak. 17847 trivial. 0 not checked. [2020-07-20 21:23:21,053 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:25,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:26,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:27,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:27,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:27,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:27,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:28,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:28,312 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:28,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:28,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:28,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:28,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:29,010 INFO L134 CoverageAnalysis]: Checked inductivity of 20591 backedges. 373 proven. 2411 refuted. 0 times theorem prover too weak. 17807 trivial. 0 not checked. [2020-07-20 21:23:29,011 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1692085686] [2020-07-20 21:23:29,011 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:29,012 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 24 [2020-07-20 21:23:29,012 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988484710] [2020-07-20 21:23:29,014 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 21:23:29,015 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:29,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 21:23:29,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2020-07-20 21:23:29,016 INFO L87 Difference]: Start difference. First operand 65 states and 114 transitions. Second operand 24 states. [2020-07-20 21:23:29,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:29,683 INFO L93 Difference]: Finished difference Result 111 states and 276 transitions. [2020-07-20 21:23:29,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:23:29,683 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 819 [2020-07-20 21:23:29,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:29,688 INFO L225 Difference]: With dead ends: 111 [2020-07-20 21:23:29,689 INFO L226 Difference]: Without dead ends: 107 [2020-07-20 21:23:29,690 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1648 GetRequests, 1599 SyntacticMatches, 18 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=205, Invalid=851, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 21:23:29,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-20 21:23:29,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 70. [2020-07-20 21:23:29,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-20 21:23:29,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 129 transitions. [2020-07-20 21:23:29,703 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 129 transitions. Word has length 819 [2020-07-20 21:23:29,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:29,704 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 129 transitions. [2020-07-20 21:23:29,704 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 21:23:29,705 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 129 transitions. [2020-07-20 21:23:29,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 419 [2020-07-20 21:23:29,708 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:29,709 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 27, 24, 24, 18, 18, 18, 18, 18, 18, 18, 18, 15, 12, 12, 12, 12, 12, 12, 12, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:29,923 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:29,924 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:29,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:29,925 INFO L82 PathProgramCache]: Analyzing trace with hash 2047786411, now seen corresponding path program 4 times [2020-07-20 21:23:29,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:29,926 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1042354350] [2020-07-20 21:23:29,926 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:30,224 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:30,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:30,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 787 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:23:30,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:30,462 INFO L134 CoverageAnalysis]: Checked inductivity of 5148 backedges. 188 proven. 1118 refuted. 0 times theorem prover too weak. 3842 trivial. 0 not checked. [2020-07-20 21:23:30,462 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:33,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:34,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:34,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:35,296 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:35,741 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:35,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:36,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:36,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:36,239 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:36,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:36,291 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:36,404 INFO L134 CoverageAnalysis]: Checked inductivity of 5148 backedges. 188 proven. 1162 refuted. 0 times theorem prover too weak. 3798 trivial. 0 not checked. [2020-07-20 21:23:36,405 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1042354350] [2020-07-20 21:23:36,405 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:36,405 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 21:23:36,405 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596775010] [2020-07-20 21:23:36,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:23:36,406 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:36,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:23:36,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:23:36,407 INFO L87 Difference]: Start difference. First operand 70 states and 129 transitions. Second operand 23 states. [2020-07-20 21:23:36,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:36,932 INFO L93 Difference]: Finished difference Result 116 states and 300 transitions. [2020-07-20 21:23:36,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:23:36,933 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 418 [2020-07-20 21:23:36,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:36,937 INFO L225 Difference]: With dead ends: 116 [2020-07-20 21:23:36,938 INFO L226 Difference]: Without dead ends: 112 [2020-07-20 21:23:36,939 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 845 GetRequests, 796 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:23:36,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-20 21:23:36,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 70. [2020-07-20 21:23:36,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-20 21:23:36,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 129 transitions. [2020-07-20 21:23:36,951 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 129 transitions. Word has length 418 [2020-07-20 21:23:36,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:36,952 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 129 transitions. [2020-07-20 21:23:36,952 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:23:36,952 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 129 transitions. [2020-07-20 21:23:36,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 677 [2020-07-20 21:23:36,957 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:36,958 INFO L422 BasicCegarLoop]: trace histogram [62, 62, 42, 41, 41, 31, 31, 31, 31, 31, 31, 31, 31, 20, 20, 20, 20, 20, 20, 20, 20, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:37,171 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:37,172 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:37,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:37,173 INFO L82 PathProgramCache]: Analyzing trace with hash -1777656900, now seen corresponding path program 8 times [2020-07-20 21:23:37,173 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:37,173 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1120749327] [2020-07-20 21:23:37,174 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:37,614 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:37,614 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:37,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 1276 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 21:23:37,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:37,933 INFO L134 CoverageAnalysis]: Checked inductivity of 14119 backedges. 349 proven. 2104 refuted. 0 times theorem prover too weak. 11666 trivial. 0 not checked. [2020-07-20 21:23:37,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:42,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:42,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:43,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:43,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:45,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:46,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:46,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:46,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:46,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:46,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:47,100 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:47,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:47,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:47,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:47,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:47,553 INFO L134 CoverageAnalysis]: Checked inductivity of 14119 backedges. 349 proven. 2156 refuted. 0 times theorem prover too weak. 11614 trivial. 0 not checked. [2020-07-20 21:23:47,554 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1120749327] [2020-07-20 21:23:47,554 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:47,554 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 21:23:47,555 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [849335571] [2020-07-20 21:23:47,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 21:23:47,556 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:47,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 21:23:47,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 21:23:47,557 INFO L87 Difference]: Start difference. First operand 70 states and 129 transitions. Second operand 25 states. [2020-07-20 21:23:48,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:48,426 INFO L93 Difference]: Finished difference Result 121 states and 324 transitions. [2020-07-20 21:23:48,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 21:23:48,427 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 676 [2020-07-20 21:23:48,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:48,432 INFO L225 Difference]: With dead ends: 121 [2020-07-20 21:23:48,432 INFO L226 Difference]: Without dead ends: 117 [2020-07-20 21:23:48,434 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1363 GetRequests, 1309 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 279 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 21:23:48,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2020-07-20 21:23:48,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 75. [2020-07-20 21:23:48,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-20 21:23:48,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 145 transitions. [2020-07-20 21:23:48,449 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 145 transitions. Word has length 676 [2020-07-20 21:23:48,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:48,451 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 145 transitions. [2020-07-20 21:23:48,451 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 21:23:48,451 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 145 transitions. [2020-07-20 21:23:48,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 755 [2020-07-20 21:23:48,460 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:48,461 INFO L422 BasicCegarLoop]: trace histogram [64, 64, 49, 47, 47, 32, 32, 32, 32, 32, 32, 32, 32, 26, 23, 23, 23, 23, 23, 23, 23, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:48,675 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:48,676 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:48,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:48,676 INFO L82 PathProgramCache]: Analyzing trace with hash -1813836186, now seen corresponding path program 4 times [2020-07-20 21:23:48,676 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:48,677 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1148829406] [2020-07-20 21:23:48,677 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:49,184 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:49,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:49,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 1416 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:23:49,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:49,611 INFO L134 CoverageAnalysis]: Checked inductivity of 17056 backedges. 414 proven. 2048 refuted. 0 times theorem prover too weak. 14594 trivial. 0 not checked. [2020-07-20 21:23:49,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:53,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:53,675 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:55,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:56,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:56,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:56,692 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:57,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:57,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:57,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:57,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:57,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:57,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:57,887 INFO L134 CoverageAnalysis]: Checked inductivity of 17056 backedges. 414 proven. 2088 refuted. 0 times theorem prover too weak. 14554 trivial. 0 not checked. [2020-07-20 21:23:57,888 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1148829406] [2020-07-20 21:23:57,888 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:57,888 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 21:23:57,888 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887171284] [2020-07-20 21:23:57,889 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:23:57,889 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:57,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:23:57,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:23:57,890 INFO L87 Difference]: Start difference. First operand 75 states and 145 transitions. Second operand 23 states. [2020-07-20 21:23:58,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:58,640 INFO L93 Difference]: Finished difference Result 159 states and 539 transitions. [2020-07-20 21:23:58,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:23:58,642 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 754 [2020-07-20 21:23:58,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:58,647 INFO L225 Difference]: With dead ends: 159 [2020-07-20 21:23:58,648 INFO L226 Difference]: Without dead ends: 155 [2020-07-20 21:23:58,649 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1517 GetRequests, 1468 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:23:58,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2020-07-20 21:23:58,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 77. [2020-07-20 21:23:58,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-07-20 21:23:58,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 152 transitions. [2020-07-20 21:23:58,670 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 152 transitions. Word has length 754 [2020-07-20 21:23:58,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:58,670 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 152 transitions. [2020-07-20 21:23:58,670 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:23:58,671 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 152 transitions. [2020-07-20 21:23:58,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 766 [2020-07-20 21:23:58,678 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:58,678 INFO L422 BasicCegarLoop]: trace histogram [66, 66, 47, 45, 45, 45, 33, 33, 33, 33, 33, 33, 33, 25, 22, 22, 22, 22, 22, 22, 22, 19, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:58,892 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:58,893 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:58,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:58,893 INFO L82 PathProgramCache]: Analyzing trace with hash 848822556, now seen corresponding path program 1 times [2020-07-20 21:23:58,894 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:58,894 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [525318218] [2020-07-20 21:23:58,894 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:59,424 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:59,425 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:59,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 1434 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:23:59,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:59,820 INFO L134 CoverageAnalysis]: Checked inductivity of 17647 backedges. 424 proven. 1891 refuted. 0 times theorem prover too weak. 15332 trivial. 0 not checked. [2020-07-20 21:23:59,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:24:03,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:03,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:04,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:05,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:05,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:06,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:06,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:06,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:06,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:06,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:06,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:06,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:07,209 INFO L134 CoverageAnalysis]: Checked inductivity of 17647 backedges. 424 proven. 1924 refuted. 0 times theorem prover too weak. 15299 trivial. 0 not checked. [2020-07-20 21:24:07,210 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [525318218] [2020-07-20 21:24:07,210 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:24:07,210 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 21:24:07,210 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [897598323] [2020-07-20 21:24:07,211 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:24:07,212 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:24:07,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:24:07,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:24:07,213 INFO L87 Difference]: Start difference. First operand 77 states and 152 transitions. Second operand 21 states. [2020-07-20 21:24:07,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:24:07,885 INFO L93 Difference]: Finished difference Result 179 states and 673 transitions. [2020-07-20 21:24:07,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:24:07,886 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 765 [2020-07-20 21:24:07,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:24:07,890 INFO L225 Difference]: With dead ends: 179 [2020-07-20 21:24:07,890 INFO L226 Difference]: Without dead ends: 175 [2020-07-20 21:24:07,892 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1538 GetRequests, 1494 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:24:07,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2020-07-20 21:24:07,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 79. [2020-07-20 21:24:07,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-07-20 21:24:07,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 160 transitions. [2020-07-20 21:24:07,917 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 160 transitions. Word has length 765 [2020-07-20 21:24:07,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:24:07,918 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 160 transitions. [2020-07-20 21:24:07,918 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:24:07,918 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 160 transitions. [2020-07-20 21:24:07,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1080 [2020-07-20 21:24:07,931 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:24:07,931 INFO L422 BasicCegarLoop]: trace histogram [82, 82, 77, 77, 61, 57, 41, 41, 41, 41, 41, 41, 41, 38, 38, 38, 38, 38, 38, 38, 25, 20, 19, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:24:08,142 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:08,143 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:24:08,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:24:08,144 INFO L82 PathProgramCache]: Analyzing trace with hash 67032718, now seen corresponding path program 1 times [2020-07-20 21:24:08,145 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:24:08,145 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1134449428] [2020-07-20 21:24:08,146 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:08,772 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:24:08,772 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:24:08,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 2022 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:24:08,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:24:09,583 INFO L134 CoverageAnalysis]: Checked inductivity of 34506 backedges. 604 proven. 3056 refuted. 0 times theorem prover too weak. 30846 trivial. 0 not checked. [2020-07-20 21:24:09,584 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:24:14,448 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:17,303 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:17,304 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:18,692 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:18,692 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:19,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:19,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:19,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:19,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:19,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:19,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:19,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:19,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:19,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:19,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:20,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:20,541 INFO L134 CoverageAnalysis]: Checked inductivity of 34506 backedges. 604 proven. 3096 refuted. 0 times theorem prover too weak. 30806 trivial. 0 not checked. [2020-07-20 21:24:20,542 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1134449428] [2020-07-20 21:24:20,542 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:24:20,542 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 21:24:20,543 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715049799] [2020-07-20 21:24:20,544 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:24:20,544 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:24:20,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:24:20,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:24:20,544 INFO L87 Difference]: Start difference. First operand 79 states and 160 transitions. Second operand 23 states. [2020-07-20 21:24:21,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:24:21,374 INFO L93 Difference]: Finished difference Result 156 states and 522 transitions. [2020-07-20 21:24:21,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:24:21,378 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1079 [2020-07-20 21:24:21,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:24:21,385 INFO L225 Difference]: With dead ends: 156 [2020-07-20 21:24:21,385 INFO L226 Difference]: Without dead ends: 152 [2020-07-20 21:24:21,386 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2166 GetRequests, 2117 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:24:21,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2020-07-20 21:24:21,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 82. [2020-07-20 21:24:21,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-07-20 21:24:21,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 170 transitions. [2020-07-20 21:24:21,410 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 170 transitions. Word has length 1079 [2020-07-20 21:24:21,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:24:21,412 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 170 transitions. [2020-07-20 21:24:21,412 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:24:21,412 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 170 transitions. [2020-07-20 21:24:21,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 981 [2020-07-20 21:24:21,427 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:24:21,427 INFO L422 BasicCegarLoop]: trace histogram [73, 73, 70, 70, 62, 53, 36, 36, 36, 36, 36, 36, 36, 35, 35, 35, 35, 35, 35, 35, 27, 17, 17, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:24:21,672 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:21,672 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:24:21,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:24:21,674 INFO L82 PathProgramCache]: Analyzing trace with hash -1973171480, now seen corresponding path program 2 times [2020-07-20 21:24:21,674 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:24:21,675 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1511815015] [2020-07-20 21:24:21,675 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:22,298 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:24:22,298 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:24:22,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 1832 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:24:22,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:24:23,293 INFO L134 CoverageAnalysis]: Checked inductivity of 28341 backedges. 583 proven. 2408 refuted. 0 times theorem prover too weak. 25350 trivial. 0 not checked. [2020-07-20 21:24:23,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:24:27,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:27,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:29,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:29,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:30,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:30,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:31,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:31,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:32,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:32,007 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:32,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:32,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:32,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:32,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:32,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:32,854 INFO L134 CoverageAnalysis]: Checked inductivity of 28341 backedges. 583 proven. 2441 refuted. 0 times theorem prover too weak. 25317 trivial. 0 not checked. [2020-07-20 21:24:32,854 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1511815015] [2020-07-20 21:24:32,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:24:32,855 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 21:24:32,855 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [714647740] [2020-07-20 21:24:32,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:24:32,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:24:32,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:24:32,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:24:32,858 INFO L87 Difference]: Start difference. First operand 82 states and 170 transitions. Second operand 21 states. [2020-07-20 21:24:33,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:24:33,582 INFO L93 Difference]: Finished difference Result 174 states and 639 transitions. [2020-07-20 21:24:33,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:24:33,584 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 980 [2020-07-20 21:24:33,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:24:33,590 INFO L225 Difference]: With dead ends: 174 [2020-07-20 21:24:33,590 INFO L226 Difference]: Without dead ends: 170 [2020-07-20 21:24:33,591 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1967 GetRequests, 1923 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:24:33,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2020-07-20 21:24:33,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 89. [2020-07-20 21:24:33,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-07-20 21:24:33,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 197 transitions. [2020-07-20 21:24:33,616 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 197 transitions. Word has length 980 [2020-07-20 21:24:33,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:24:33,617 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 197 transitions. [2020-07-20 21:24:33,617 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:24:33,617 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 197 transitions. [2020-07-20 21:24:33,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1135 [2020-07-20 21:24:33,632 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:24:33,632 INFO L422 BasicCegarLoop]: trace histogram [88, 88, 79, 79, 65, 60, 44, 44, 44, 44, 44, 44, 44, 39, 39, 39, 39, 39, 39, 39, 28, 21, 21, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:24:33,845 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:33,846 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:24:33,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:24:33,847 INFO L82 PathProgramCache]: Analyzing trace with hash -191683652, now seen corresponding path program 3 times [2020-07-20 21:24:33,848 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:24:33,848 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1113330028] [2020-07-20 21:24:33,848 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:34,549 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:24:34,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:24:34,556 INFO L263 TraceCheckSpWp]: Trace formula consists of 2126 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 21:24:34,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:24:35,402 INFO L134 CoverageAnalysis]: Checked inductivity of 38234 backedges. 764 proven. 3594 refuted. 0 times theorem prover too weak. 33876 trivial. 0 not checked. [2020-07-20 21:24:35,402 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:24:42,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:44,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:46,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:48,309 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:48,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:48,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:49,327 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:49,574 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:49,576 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:49,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:49,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:49,816 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:49,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:49,903 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:50,542 INFO L134 CoverageAnalysis]: Checked inductivity of 38234 backedges. 770 proven. 3644 refuted. 0 times theorem prover too weak. 33820 trivial. 0 not checked. [2020-07-20 21:24:50,542 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1113330028] [2020-07-20 21:24:50,542 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:24:50,543 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 21:24:50,543 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [142016023] [2020-07-20 21:24:50,544 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 21:24:50,544 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:24:50,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 21:24:50,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 21:24:50,545 INFO L87 Difference]: Start difference. First operand 89 states and 197 transitions. Second operand 25 states. [2020-07-20 21:24:51,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:24:51,823 INFO L93 Difference]: Finished difference Result 263 states and 1331 transitions. [2020-07-20 21:24:51,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 21:24:51,825 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1134 [2020-07-20 21:24:51,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:24:51,832 INFO L225 Difference]: With dead ends: 263 [2020-07-20 21:24:51,832 INFO L226 Difference]: Without dead ends: 142 [2020-07-20 21:24:51,839 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2277 GetRequests, 2223 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 21:24:51,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2020-07-20 21:24:51,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2020-07-20 21:24:51,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2020-07-20 21:24:51,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 326 transitions. [2020-07-20 21:24:51,866 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 326 transitions. Word has length 1134 [2020-07-20 21:24:51,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:24:51,867 INFO L479 AbstractCegarLoop]: Abstraction has 142 states and 326 transitions. [2020-07-20 21:24:51,868 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 21:24:51,868 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 326 transitions. [2020-07-20 21:24:51,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1383 [2020-07-20 21:24:51,893 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:24:51,894 INFO L422 BasicCegarLoop]: trace histogram [104, 104, 99, 99, 86, 71, 52, 52, 52, 52, 52, 52, 52, 49, 49, 49, 49, 49, 49, 49, 34, 33, 22, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:24:52,107 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:52,108 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:24:52,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:24:52,109 INFO L82 PathProgramCache]: Analyzing trace with hash 1439131902, now seen corresponding path program 4 times [2020-07-20 21:24:52,110 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:24:52,110 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [680358099] [2020-07-20 21:24:52,110 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:52,991 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:24:52,991 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:24:53,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 2588 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 21:24:53,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:24:53,939 INFO L134 CoverageAnalysis]: Checked inductivity of 56976 backedges. 926 proven. 4452 refuted. 0 times theorem prover too weak. 51598 trivial. 0 not checked. [2020-07-20 21:24:53,939 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:25:03,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:03,278 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:06,523 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:06,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:08,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:09,895 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:09,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:10,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:10,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:11,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:11,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:11,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:11,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:11,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:11,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:11,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:11,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:12,521 INFO L134 CoverageAnalysis]: Checked inductivity of 56976 backedges. 930 proven. 4504 refuted. 0 times theorem prover too weak. 51542 trivial. 0 not checked. [2020-07-20 21:25:12,522 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [680358099] [2020-07-20 21:25:12,522 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:25:12,522 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 21:25:12,523 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64398803] [2020-07-20 21:25:12,524 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 21:25:12,524 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:25:12,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 21:25:12,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 21:25:12,525 INFO L87 Difference]: Start difference. First operand 142 states and 326 transitions. Second operand 25 states. [2020-07-20 21:25:14,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:25:14,005 INFO L93 Difference]: Finished difference Result 385 states and 1941 transitions. [2020-07-20 21:25:14,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 21:25:14,007 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1382 [2020-07-20 21:25:14,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:25:14,017 INFO L225 Difference]: With dead ends: 385 [2020-07-20 21:25:14,017 INFO L226 Difference]: Without dead ends: 198 [2020-07-20 21:25:14,035 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2773 GetRequests, 2719 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 21:25:14,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2020-07-20 21:25:14,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 147. [2020-07-20 21:25:14,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2020-07-20 21:25:14,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 346 transitions. [2020-07-20 21:25:14,076 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 346 transitions. Word has length 1382 [2020-07-20 21:25:14,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:25:14,077 INFO L479 AbstractCegarLoop]: Abstraction has 147 states and 346 transitions. [2020-07-20 21:25:14,077 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 21:25:14,077 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 346 transitions. [2020-07-20 21:25:14,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1018 [2020-07-20 21:25:14,095 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:25:14,096 INFO L422 BasicCegarLoop]: trace histogram [81, 81, 70, 70, 54, 50, 40, 40, 40, 40, 40, 40, 40, 35, 35, 35, 35, 35, 35, 35, 27, 20, 19, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:25:14,308 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:25:14,309 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:25:14,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:25:14,310 INFO L82 PathProgramCache]: Analyzing trace with hash -1546605554, now seen corresponding path program 5 times [2020-07-20 21:25:14,310 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:25:14,311 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [937886579] [2020-07-20 21:25:14,313 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:25:15,091 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:25:15,091 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:25:15,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 1912 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:25:15,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:25:15,869 INFO L134 CoverageAnalysis]: Checked inductivity of 30776 backedges. 615 proven. 2841 refuted. 0 times theorem prover too weak. 27320 trivial. 0 not checked. [2020-07-20 21:25:15,869 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:25:22,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:25,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:25,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:27,301 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:28,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:29,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:29,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:29,333 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:29,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:29,647 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:29,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:30,359 INFO L134 CoverageAnalysis]: Checked inductivity of 30776 backedges. 617 proven. 2879 refuted. 0 times theorem prover too weak. 27280 trivial. 0 not checked. [2020-07-20 21:25:30,360 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [937886579] [2020-07-20 21:25:30,360 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:25:30,360 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 21:25:30,360 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072899844] [2020-07-20 21:25:30,361 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:25:30,361 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:25:30,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:25:30,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:25:30,362 INFO L87 Difference]: Start difference. First operand 147 states and 346 transitions. Second operand 23 states. [2020-07-20 21:25:31,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:25:31,640 INFO L93 Difference]: Finished difference Result 263 states and 940 transitions. [2020-07-20 21:25:31,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:25:31,642 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1017 [2020-07-20 21:25:31,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:25:31,652 INFO L225 Difference]: With dead ends: 263 [2020-07-20 21:25:31,652 INFO L226 Difference]: Without dead ends: 249 [2020-07-20 21:25:31,657 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2042 GetRequests, 1993 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:25:31,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2020-07-20 21:25:31,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 150. [2020-07-20 21:25:31,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2020-07-20 21:25:31,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 358 transitions. [2020-07-20 21:25:31,701 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 358 transitions. Word has length 1017 [2020-07-20 21:25:31,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:25:31,702 INFO L479 AbstractCegarLoop]: Abstraction has 150 states and 358 transitions. [2020-07-20 21:25:31,702 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:25:31,702 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 358 transitions. [2020-07-20 21:25:31,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1177 [2020-07-20 21:25:31,725 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:25:31,726 INFO L422 BasicCegarLoop]: trace histogram [90, 90, 83, 83, 67, 64, 45, 45, 45, 45, 45, 45, 45, 41, 41, 41, 41, 41, 41, 41, 26, 23, 22, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:25:31,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:25:31,942 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:25:31,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:25:31,944 INFO L82 PathProgramCache]: Analyzing trace with hash 770316597, now seen corresponding path program 6 times [2020-07-20 21:25:31,944 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:25:31,944 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1605885921] [2020-07-20 21:25:31,945 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:25:32,893 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:25:32,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:25:32,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 2201 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:25:32,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:25:33,629 INFO L134 CoverageAnalysis]: Checked inductivity of 41099 backedges. 644 proven. 2934 refuted. 0 times theorem prover too weak. 37521 trivial. 0 not checked. [2020-07-20 21:25:33,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:25:41,014 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:42,895 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:42,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:44,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:45,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:45,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:46,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:46,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:46,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:46,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:46,309 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:46,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:47,145 INFO L134 CoverageAnalysis]: Checked inductivity of 41099 backedges. 644 proven. 2964 refuted. 0 times theorem prover too weak. 37491 trivial. 0 not checked. [2020-07-20 21:25:47,146 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1605885921] [2020-07-20 21:25:47,146 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:25:47,147 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 21:25:47,147 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340388152] [2020-07-20 21:25:47,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:25:47,148 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:25:47,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:25:47,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:25:47,149 INFO L87 Difference]: Start difference. First operand 150 states and 358 transitions. Second operand 21 states. [2020-07-20 21:25:48,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:25:48,129 INFO L93 Difference]: Finished difference Result 299 states and 1198 transitions. [2020-07-20 21:25:48,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:25:48,131 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1176 [2020-07-20 21:25:48,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:25:48,140 INFO L225 Difference]: With dead ends: 299 [2020-07-20 21:25:48,141 INFO L226 Difference]: Without dead ends: 285 [2020-07-20 21:25:48,145 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2359 GetRequests, 2315 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:25:48,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2020-07-20 21:25:48,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 150. [2020-07-20 21:25:48,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2020-07-20 21:25:48,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 358 transitions. [2020-07-20 21:25:48,190 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 358 transitions. Word has length 1176 [2020-07-20 21:25:48,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:25:48,191 INFO L479 AbstractCegarLoop]: Abstraction has 150 states and 358 transitions. [2020-07-20 21:25:48,192 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:25:48,192 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 358 transitions. [2020-07-20 21:25:48,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 871 [2020-07-20 21:25:48,207 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:25:48,207 INFO L422 BasicCegarLoop]: trace histogram [64, 64, 63, 63, 52, 49, 32, 32, 32, 32, 32, 32, 32, 31, 31, 31, 31, 31, 31, 31, 20, 18, 15, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:25:48,422 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:25:48,423 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:25:48,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:25:48,423 INFO L82 PathProgramCache]: Analyzing trace with hash 212441570, now seen corresponding path program 7 times [2020-07-20 21:25:48,424 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:25:48,424 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [79501059] [2020-07-20 21:25:48,424 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:25:49,230 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:25:49,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:25:49,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 1630 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:25:49,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:25:49,827 INFO L134 CoverageAnalysis]: Checked inductivity of 22222 backedges. 568 proven. 2067 refuted. 0 times theorem prover too weak. 19587 trivial. 0 not checked. [2020-07-20 21:25:49,828 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:25:52,494 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 21:25:56,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:56,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:58,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:00,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:00,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:01,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:01,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:02,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:02,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:02,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:02,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:02,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:02,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:03,400 INFO L134 CoverageAnalysis]: Checked inductivity of 22222 backedges. 570 proven. 2098 refuted. 0 times theorem prover too weak. 19554 trivial. 0 not checked. [2020-07-20 21:26:03,400 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [79501059] [2020-07-20 21:26:03,400 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:26:03,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 21:26:03,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485074624] [2020-07-20 21:26:03,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:26:03,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:26:03,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:26:03,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:26:03,403 INFO L87 Difference]: Start difference. First operand 150 states and 358 transitions. Second operand 21 states. [2020-07-20 21:26:04,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:26:04,463 INFO L93 Difference]: Finished difference Result 251 states and 812 transitions. [2020-07-20 21:26:04,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:26:04,467 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 870 [2020-07-20 21:26:04,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:26:04,473 INFO L225 Difference]: With dead ends: 251 [2020-07-20 21:26:04,474 INFO L226 Difference]: Without dead ends: 237 [2020-07-20 21:26:04,477 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1747 GetRequests, 1703 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:26:04,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2020-07-20 21:26:04,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 170. [2020-07-20 21:26:04,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2020-07-20 21:26:04,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 456 transitions. [2020-07-20 21:26:04,520 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 456 transitions. Word has length 870 [2020-07-20 21:26:04,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:26:04,521 INFO L479 AbstractCegarLoop]: Abstraction has 170 states and 456 transitions. [2020-07-20 21:26:04,521 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:26:04,521 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 456 transitions. [2020-07-20 21:26:04,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1008 [2020-07-20 21:26:04,543 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:26:04,544 INFO L422 BasicCegarLoop]: trace histogram [79, 79, 70, 70, 54, 52, 39, 39, 39, 39, 39, 39, 39, 35, 35, 35, 35, 35, 35, 35, 25, 19, 18, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:26:04,759 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:26:04,760 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:26:04,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:26:04,761 INFO L82 PathProgramCache]: Analyzing trace with hash -35229403, now seen corresponding path program 8 times [2020-07-20 21:26:04,762 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:26:04,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [98282055] [2020-07-20 21:26:04,763 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:26:05,783 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:26:05,783 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:26:05,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 1889 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:26:05,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:26:06,511 INFO L134 CoverageAnalysis]: Checked inductivity of 30085 backedges. 613 proven. 2805 refuted. 0 times theorem prover too weak. 26667 trivial. 0 not checked. [2020-07-20 21:26:06,512 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:26:15,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:17,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:17,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:19,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:20,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:20,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:21,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:21,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:21,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:22,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:22,825 INFO L134 CoverageAnalysis]: Checked inductivity of 30085 backedges. 615 proven. 2843 refuted. 0 times theorem prover too weak. 26627 trivial. 0 not checked. [2020-07-20 21:26:22,825 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [98282055] [2020-07-20 21:26:22,826 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:26:22,826 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 21:26:22,826 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8192816] [2020-07-20 21:26:22,827 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:26:22,827 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:26:22,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:26:22,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:26:22,828 INFO L87 Difference]: Start difference. First operand 170 states and 456 transitions. Second operand 23 states. [2020-07-20 21:26:24,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:26:24,106 INFO L93 Difference]: Finished difference Result 254 states and 839 transitions. [2020-07-20 21:26:24,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:26:24,109 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1007 [2020-07-20 21:26:24,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:26:24,115 INFO L225 Difference]: With dead ends: 254 [2020-07-20 21:26:24,115 INFO L226 Difference]: Without dead ends: 240 [2020-07-20 21:26:24,119 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2022 GetRequests, 1973 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:26:24,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2020-07-20 21:26:24,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 166. [2020-07-20 21:26:24,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2020-07-20 21:26:24,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 436 transitions. [2020-07-20 21:26:24,154 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 436 transitions. Word has length 1007 [2020-07-20 21:26:24,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:26:24,155 INFO L479 AbstractCegarLoop]: Abstraction has 166 states and 436 transitions. [2020-07-20 21:26:24,155 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:26:24,156 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 436 transitions. [2020-07-20 21:26:24,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1142 [2020-07-20 21:26:24,176 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:26:24,176 INFO L422 BasicCegarLoop]: trace histogram [85, 85, 82, 82, 70, 62, 42, 42, 42, 42, 42, 42, 42, 41, 41, 41, 41, 41, 41, 41, 29, 20, 20, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:26:24,389 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:26:24,390 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:26:24,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:26:24,391 INFO L82 PathProgramCache]: Analyzing trace with hash -1631887240, now seen corresponding path program 9 times [2020-07-20 21:26:24,392 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:26:24,392 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [907859800] [2020-07-20 21:26:24,393 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:26:25,500 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:26:25,501 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:26:25,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 2138 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:26:25,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:26:26,424 INFO L134 CoverageAnalysis]: Checked inductivity of 38594 backedges. 703 proven. 2755 refuted. 0 times theorem prover too weak. 35136 trivial. 0 not checked. [2020-07-20 21:26:26,424 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:26:29,640 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 21:26:32,350 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 21:26:35,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:39,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:39,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:41,278 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:42,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:42,863 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:43,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:43,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:43,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:43,920 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:44,113 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:45,046 INFO L134 CoverageAnalysis]: Checked inductivity of 38594 backedges. 703 proven. 2787 refuted. 0 times theorem prover too weak. 35104 trivial. 0 not checked. [2020-07-20 21:26:45,047 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [907859800] [2020-07-20 21:26:45,047 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:26:45,048 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 21:26:45,048 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956935892] [2020-07-20 21:26:45,049 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:26:45,049 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:26:45,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:26:45,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:26:45,050 INFO L87 Difference]: Start difference. First operand 166 states and 436 transitions. Second operand 21 states. [2020-07-20 21:26:46,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:26:46,405 INFO L93 Difference]: Finished difference Result 269 states and 930 transitions. [2020-07-20 21:26:46,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:26:46,410 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1141 [2020-07-20 21:26:46,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:26:46,419 INFO L225 Difference]: With dead ends: 269 [2020-07-20 21:26:46,420 INFO L226 Difference]: Without dead ends: 255 [2020-07-20 21:26:46,424 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2289 GetRequests, 2245 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:26:46,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2020-07-20 21:26:46,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 160. [2020-07-20 21:26:46,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2020-07-20 21:26:46,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 409 transitions. [2020-07-20 21:26:46,468 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 409 transitions. Word has length 1141 [2020-07-20 21:26:46,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:26:46,469 INFO L479 AbstractCegarLoop]: Abstraction has 160 states and 409 transitions. [2020-07-20 21:26:46,469 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:26:46,469 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 409 transitions. [2020-07-20 21:26:46,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1050 [2020-07-20 21:26:46,489 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:26:46,489 INFO L422 BasicCegarLoop]: trace histogram [83, 83, 70, 70, 64, 60, 41, 41, 41, 41, 41, 41, 41, 35, 35, 35, 35, 35, 35, 35, 29, 19, 19, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:26:46,702 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:26:46,703 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:26:46,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:26:46,704 INFO L82 PathProgramCache]: Analyzing trace with hash -571664055, now seen corresponding path program 10 times [2020-07-20 21:26:46,705 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:26:46,705 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [826357955] [2020-07-20 21:26:46,705 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:26:47,661 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:26:47,662 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:26:47,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 1965 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 21:26:47,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:26:48,368 INFO L134 CoverageAnalysis]: Checked inductivity of 32718 backedges. 851 proven. 3144 refuted. 0 times theorem prover too weak. 28723 trivial. 0 not checked. [2020-07-20 21:26:48,369 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:26:51,555 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 21:26:56,191 WARN L193 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:26:56,930 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:26:57,415 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:26:57,524 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:26:57,644 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 21:26:57,762 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 21:26:57,875 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 21:26:57,983 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 21:26:58,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:58,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:02,172 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:27:02,286 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:27:02,402 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:27:02,509 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 21:27:03,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:06,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:06,307 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:09,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:09,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:10,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:10,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:10,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:11,169 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:11,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:11,287 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:11,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:12,339 INFO L134 CoverageAnalysis]: Checked inductivity of 32718 backedges. 855 proven. 3196 refuted. 0 times theorem prover too weak. 28667 trivial. 0 not checked. [2020-07-20 21:27:12,339 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [826357955] [2020-07-20 21:27:12,340 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:27:12,340 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 21:27:12,340 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108724627] [2020-07-20 21:27:12,341 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 21:27:12,341 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:27:12,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 21:27:12,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 21:27:12,342 INFO L87 Difference]: Start difference. First operand 160 states and 409 transitions. Second operand 25 states. [2020-07-20 21:27:14,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:27:14,913 INFO L93 Difference]: Finished difference Result 258 states and 863 transitions. [2020-07-20 21:27:14,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 21:27:14,917 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1049 [2020-07-20 21:27:14,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:27:14,922 INFO L225 Difference]: With dead ends: 258 [2020-07-20 21:27:14,923 INFO L226 Difference]: Without dead ends: 195 [2020-07-20 21:27:14,927 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2107 GetRequests, 2053 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 21:27:14,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2020-07-20 21:27:14,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 173. [2020-07-20 21:27:14,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-20 21:27:14,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 458 transitions. [2020-07-20 21:27:14,966 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 458 transitions. Word has length 1049 [2020-07-20 21:27:14,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:27:14,967 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 458 transitions. [2020-07-20 21:27:14,967 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 21:27:14,967 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 458 transitions. [2020-07-20 21:27:14,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1006 [2020-07-20 21:27:14,987 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:27:14,987 INFO L422 BasicCegarLoop]: trace histogram [74, 74, 73, 73, 58, 58, 37, 37, 37, 37, 37, 37, 37, 36, 36, 36, 36, 36, 36, 36, 22, 21, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:27:15,202 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:27:15,203 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:27:15,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:27:15,204 INFO L82 PathProgramCache]: Analyzing trace with hash 1385099912, now seen corresponding path program 11 times [2020-07-20 21:27:15,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:27:15,204 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1446936940] [2020-07-20 21:27:15,207 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:27:16,401 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:27:16,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:27:16,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 1884 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 21:27:16,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:27:17,092 INFO L134 CoverageAnalysis]: Checked inductivity of 29806 backedges. 566 proven. 2122 refuted. 0 times theorem prover too weak. 27118 trivial. 0 not checked. [2020-07-20 21:27:17,092 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:27:27,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:27,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:31,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:33,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:33,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:33,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:34,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:34,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:34,233 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:34,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:34,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:34,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:35,533 INFO L134 CoverageAnalysis]: Checked inductivity of 29806 backedges. 566 proven. 2146 refuted. 0 times theorem prover too weak. 27094 trivial. 0 not checked. [2020-07-20 21:27:35,534 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1446936940] [2020-07-20 21:27:35,534 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:27:35,534 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 21:27:35,534 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1619607232] [2020-07-20 21:27:35,535 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 21:27:35,535 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:27:35,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 21:27:35,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:27:35,536 INFO L87 Difference]: Start difference. First operand 173 states and 458 transitions. Second operand 19 states. [2020-07-20 21:27:36,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:27:36,083 INFO L93 Difference]: Finished difference Result 348 states and 1590 transitions. [2020-07-20 21:27:36,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 21:27:36,088 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1005 [2020-07-20 21:27:36,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:27:36,098 INFO L225 Difference]: With dead ends: 348 [2020-07-20 21:27:36,098 INFO L226 Difference]: Without dead ends: 334 [2020-07-20 21:27:36,104 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2016 GetRequests, 1977 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 21:27:36,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2020-07-20 21:27:36,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 175. [2020-07-20 21:27:36,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2020-07-20 21:27:36,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 473 transitions. [2020-07-20 21:27:36,155 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 473 transitions. Word has length 1005 [2020-07-20 21:27:36,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:27:36,156 INFO L479 AbstractCegarLoop]: Abstraction has 175 states and 473 transitions. [2020-07-20 21:27:36,156 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 21:27:36,156 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 473 transitions. [2020-07-20 21:27:36,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1459 [2020-07-20 21:27:36,181 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:27:36,182 INFO L422 BasicCegarLoop]: trace histogram [110, 110, 105, 105, 83, 78, 55, 55, 55, 55, 55, 55, 55, 52, 52, 52, 52, 52, 52, 52, 32, 28, 26, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:27:36,396 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:27:36,397 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:27:36,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:27:36,398 INFO L82 PathProgramCache]: Analyzing trace with hash 658044354, now seen corresponding path program 12 times [2020-07-20 21:27:36,399 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:27:36,399 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1213989470] [2020-07-20 21:27:36,399 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:27:37,464 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:27:37,465 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:27:37,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 2732 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:27:37,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:27:38,820 INFO L134 CoverageAnalysis]: Checked inductivity of 63470 backedges. 737 proven. 3743 refuted. 0 times theorem prover too weak. 58990 trivial. 0 not checked. [2020-07-20 21:27:38,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:27:41,490 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:27:43,099 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:27:43,314 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 21:27:43,430 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 21:27:43,538 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 21:27:56,443 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:27:56,548 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:27:56,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:56,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:59,805 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 21:28:02,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:02,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:04,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:04,807 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:06,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:06,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:06,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:06,861 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:07,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:07,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:07,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:07,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:07,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:09,490 INFO L134 CoverageAnalysis]: Checked inductivity of 63470 backedges. 739 proven. 3771 refuted. 0 times theorem prover too weak. 58960 trivial. 0 not checked. [2020-07-20 21:28:09,491 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1213989470] [2020-07-20 21:28:09,491 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:28:09,492 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 21:28:09,492 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1236648475] [2020-07-20 21:28:09,493 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:28:09,493 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:28:09,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:28:09,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:28:09,494 INFO L87 Difference]: Start difference. First operand 175 states and 473 transitions. Second operand 21 states. [2020-07-20 21:28:10,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:28:10,789 INFO L93 Difference]: Finished difference Result 261 states and 855 transitions. [2020-07-20 21:28:10,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:28:10,797 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1458 [2020-07-20 21:28:10,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:28:10,809 INFO L225 Difference]: With dead ends: 261 [2020-07-20 21:28:10,809 INFO L226 Difference]: Without dead ends: 247 [2020-07-20 21:28:10,815 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2923 GetRequests, 2879 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:28:10,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2020-07-20 21:28:10,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 173. [2020-07-20 21:28:10,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-20 21:28:10,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 458 transitions. [2020-07-20 21:28:10,872 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 458 transitions. Word has length 1458 [2020-07-20 21:28:10,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:28:10,874 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 458 transitions. [2020-07-20 21:28:10,874 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:28:10,874 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 458 transitions. [2020-07-20 21:28:10,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1240 [2020-07-20 21:28:10,911 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:28:10,913 INFO L422 BasicCegarLoop]: trace histogram [93, 93, 88, 88, 74, 72, 46, 46, 46, 46, 46, 46, 46, 44, 44, 44, 44, 44, 44, 44, 28, 28, 21, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:28:11,128 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:28:11,129 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:28:11,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:28:11,130 INFO L82 PathProgramCache]: Analyzing trace with hash 2088891109, now seen corresponding path program 13 times [2020-07-20 21:28:11,131 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:28:11,131 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1858177421] [2020-07-20 21:28:11,132 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:28:12,317 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:28:12,317 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:28:12,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 2317 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 21:28:12,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:28:13,500 INFO L134 CoverageAnalysis]: Checked inductivity of 45605 backedges. 1193 proven. 3592 refuted. 0 times theorem prover too weak. 40820 trivial. 0 not checked. [2020-07-20 21:28:13,501 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:28:15,644 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:28:16,652 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:28:16,757 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:28:16,872 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:28:16,987 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:28:17,476 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:28:17,605 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:28:17,728 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 21:28:17,845 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 21:28:18,682 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 21:28:18,818 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 21:28:18,966 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 21:28:19,126 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 21:28:19,283 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 21:28:19,430 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 21:28:19,572 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 21:28:19,698 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 21:28:19,815 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 21:28:19,922 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 21:28:25,612 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:28:26,529 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:28:26,744 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:28:26,850 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:28:27,874 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:31,028 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:28:31,148 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:28:31,266 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:28:31,376 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:28:31,586 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 21:28:32,053 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:32,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:38,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:38,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:39,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:39,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:41,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:41,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:43,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:43,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:43,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:44,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:44,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:44,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:45,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:47,163 INFO L134 CoverageAnalysis]: Checked inductivity of 45605 backedges. 1195 proven. 3646 refuted. 0 times theorem prover too weak. 40764 trivial. 0 not checked. [2020-07-20 21:28:47,163 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1858177421] [2020-07-20 21:28:47,163 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:28:47,164 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 21:28:47,164 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1687091207] [2020-07-20 21:28:47,165 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 21:28:47,165 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:28:47,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 21:28:47,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 21:28:47,166 INFO L87 Difference]: Start difference. First operand 173 states and 458 transitions. Second operand 25 states. [2020-07-20 21:28:49,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:28:49,832 INFO L93 Difference]: Finished difference Result 244 states and 737 transitions. [2020-07-20 21:28:49,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 21:28:49,839 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1239 [2020-07-20 21:28:49,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:28:49,845 INFO L225 Difference]: With dead ends: 244 [2020-07-20 21:28:49,845 INFO L226 Difference]: Without dead ends: 198 [2020-07-20 21:28:49,849 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2487 GetRequests, 2433 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 21:28:49,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2020-07-20 21:28:49,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 192. [2020-07-20 21:28:49,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2020-07-20 21:28:49,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 495 transitions. [2020-07-20 21:28:49,886 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 495 transitions. Word has length 1239 [2020-07-20 21:28:49,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:28:49,887 INFO L479 AbstractCegarLoop]: Abstraction has 192 states and 495 transitions. [2020-07-20 21:28:49,887 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 21:28:49,887 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 495 transitions. [2020-07-20 21:28:49,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1054 [2020-07-20 21:28:49,907 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:28:49,908 INFO L422 BasicCegarLoop]: trace histogram [80, 80, 75, 75, 58, 58, 40, 40, 40, 40, 40, 40, 40, 37, 37, 37, 37, 37, 37, 37, 22, 21, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:28:50,123 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:28:50,124 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:28:50,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:28:50,126 INFO L82 PathProgramCache]: Analyzing trace with hash -772181704, now seen corresponding path program 14 times [2020-07-20 21:28:50,126 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:28:50,127 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [126501171] [2020-07-20 21:28:50,127 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:28:51,280 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:28:51,281 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:28:51,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 1976 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:28:51,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:28:52,374 INFO L134 CoverageAnalysis]: Checked inductivity of 32830 backedges. 772 proven. 2843 refuted. 0 times theorem prover too weak. 29215 trivial. 0 not checked. [2020-07-20 21:28:52,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:28:54,597 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:28:54,710 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:28:54,831 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:28:54,956 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:28:55,772 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:28:55,895 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:28:56,029 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:28:56,172 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:28:57,423 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:28:57,568 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:28:57,732 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 21:28:57,891 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 21:28:58,049 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 21:28:58,190 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 21:28:58,324 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 21:28:58,445 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 21:28:58,557 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 21:28:58,663 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:29:05,676 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:29:05,781 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:29:06,369 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:29:06,478 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:29:06,588 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:29:06,698 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:29:07,364 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:29:07,474 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:29:07,593 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:29:07,706 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:29:07,823 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 21:29:07,941 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 21:29:08,048 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 21:29:08,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:08,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:13,695 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:29:13,909 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:29:14,029 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:29:14,143 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 21:29:14,251 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 21:29:14,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:18,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:19,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:19,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:20,815 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:21,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:21,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:21,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:21,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:21,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:21,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:21,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:21,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:22,689 INFO L134 CoverageAnalysis]: Checked inductivity of 32830 backedges. 780 proven. 2879 refuted. 0 times theorem prover too weak. 29171 trivial. 0 not checked. [2020-07-20 21:29:22,690 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [126501171] [2020-07-20 21:29:22,690 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:29:22,691 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 21:29:22,691 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422302126] [2020-07-20 21:29:22,692 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:29:22,692 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:29:22,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:29:22,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:29:22,693 INFO L87 Difference]: Start difference. First operand 192 states and 495 transitions. Second operand 23 states. [2020-07-20 21:29:24,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:29:24,009 INFO L93 Difference]: Finished difference Result 321 states and 1080 transitions. [2020-07-20 21:29:24,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:29:24,012 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1053 [2020-07-20 21:29:24,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:29:24,020 INFO L225 Difference]: With dead ends: 321 [2020-07-20 21:29:24,020 INFO L226 Difference]: Without dead ends: 255 [2020-07-20 21:29:24,025 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2114 GetRequests, 2065 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:29:24,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2020-07-20 21:29:24,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 215. [2020-07-20 21:29:24,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 215 states. [2020-07-20 21:29:24,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 579 transitions. [2020-07-20 21:29:24,055 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 579 transitions. Word has length 1053 [2020-07-20 21:29:24,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:29:24,056 INFO L479 AbstractCegarLoop]: Abstraction has 215 states and 579 transitions. [2020-07-20 21:29:24,056 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:29:24,056 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 579 transitions. [2020-07-20 21:29:24,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1013 [2020-07-20 21:29:24,076 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:29:24,077 INFO L422 BasicCegarLoop]: trace histogram [78, 78, 71, 71, 57, 54, 39, 39, 39, 39, 39, 39, 39, 35, 35, 35, 35, 35, 35, 35, 22, 21, 17, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:29:24,291 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:29:24,292 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:29:24,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:29:24,293 INFO L82 PathProgramCache]: Analyzing trace with hash 1756741361, now seen corresponding path program 15 times [2020-07-20 21:29:24,294 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:29:24,294 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [200971617] [2020-07-20 21:29:24,294 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:29:25,407 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:29:25,407 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:29:25,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 1895 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:29:25,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:29:26,042 INFO L134 CoverageAnalysis]: Checked inductivity of 30323 backedges. 746 proven. 2353 refuted. 0 times theorem prover too weak. 27224 trivial. 0 not checked. [2020-07-20 21:29:26,043 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:29:28,218 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:29:29,009 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:29:29,123 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:29:29,239 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:29:29,341 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:29:30,417 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:29:30,549 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:29:30,682 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 21:29:30,823 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 21:29:30,963 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 21:29:31,095 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 21:29:31,216 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 21:29:31,330 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:29:31,436 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:29:32,152 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 21:29:39,288 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 21:29:39,404 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:29:39,517 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:29:40,355 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:29:40,476 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:29:40,609 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:29:40,742 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:29:40,865 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 21:29:40,983 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:29:41,087 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 21:29:41,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:41,373 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:47,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:51,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:51,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:52,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:52,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:52,785 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:53,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:53,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:53,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:53,960 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:56,101 INFO L134 CoverageAnalysis]: Checked inductivity of 30323 backedges. 748 proven. 2384 refuted. 0 times theorem prover too weak. 27191 trivial. 0 not checked. [2020-07-20 21:29:56,102 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [200971617] [2020-07-20 21:29:56,102 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:29:56,103 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 21:29:56,103 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1486133892] [2020-07-20 21:29:56,104 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:29:56,104 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:29:56,104 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:29:56,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:29:56,105 INFO L87 Difference]: Start difference. First operand 215 states and 579 transitions. Second operand 21 states. [2020-07-20 21:29:57,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:29:57,940 INFO L93 Difference]: Finished difference Result 325 states and 1169 transitions. [2020-07-20 21:29:57,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:29:57,942 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1012 [2020-07-20 21:29:57,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:29:57,949 INFO L225 Difference]: With dead ends: 325 [2020-07-20 21:29:57,949 INFO L226 Difference]: Without dead ends: 308 [2020-07-20 21:29:57,952 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2031 GetRequests, 1987 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:29:57,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2020-07-20 21:29:57,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 244. [2020-07-20 21:29:57,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2020-07-20 21:29:57,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 738 transitions. [2020-07-20 21:29:57,998 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 738 transitions. Word has length 1012 [2020-07-20 21:29:57,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:29:57,999 INFO L479 AbstractCegarLoop]: Abstraction has 244 states and 738 transitions. [2020-07-20 21:29:57,999 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:29:57,999 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 738 transitions. [2020-07-20 21:29:58,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1221 [2020-07-20 21:29:58,022 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:29:58,022 INFO L422 BasicCegarLoop]: trace histogram [93, 93, 86, 86, 70, 69, 46, 46, 46, 46, 46, 46, 46, 43, 43, 43, 43, 43, 43, 43, 26, 24, 24, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:29:58,237 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:29:58,238 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:29:58,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:29:58,239 INFO L82 PathProgramCache]: Analyzing trace with hash -2064675234, now seen corresponding path program 16 times [2020-07-20 21:29:58,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:29:58,240 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1429891897] [2020-07-20 21:29:58,240 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:29:59,555 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:29:59,555 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:29:59,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 2282 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:29:59,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:30:00,381 INFO L134 CoverageAnalysis]: Checked inductivity of 44245 backedges. 825 proven. 3367 refuted. 0 times theorem prover too weak. 40053 trivial. 0 not checked. [2020-07-20 21:30:00,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:30:03,752 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 21:30:10,722 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:30:11,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:15,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:15,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:16,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:17,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:18,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:18,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:18,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:18,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:18,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:19,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:20,747 INFO L134 CoverageAnalysis]: Checked inductivity of 44245 backedges. 829 proven. 3403 refuted. 0 times theorem prover too weak. 40013 trivial. 0 not checked. [2020-07-20 21:30:20,748 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1429891897] [2020-07-20 21:30:20,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:30:20,748 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 21:30:20,748 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939271250] [2020-07-20 21:30:20,750 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:30:20,750 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:30:20,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:30:20,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:30:20,751 INFO L87 Difference]: Start difference. First operand 244 states and 738 transitions. Second operand 23 states. [2020-07-20 21:30:21,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:30:21,950 INFO L93 Difference]: Finished difference Result 332 states and 1206 transitions. [2020-07-20 21:30:21,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:30:21,954 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1220 [2020-07-20 21:30:21,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:30:21,961 INFO L225 Difference]: With dead ends: 332 [2020-07-20 21:30:21,962 INFO L226 Difference]: Without dead ends: 315 [2020-07-20 21:30:21,965 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2448 GetRequests, 2399 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:30:21,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2020-07-20 21:30:22,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 248. [2020-07-20 21:30:22,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2020-07-20 21:30:22,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 722 transitions. [2020-07-20 21:30:22,016 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 722 transitions. Word has length 1220 [2020-07-20 21:30:22,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:30:22,018 INFO L479 AbstractCegarLoop]: Abstraction has 248 states and 722 transitions. [2020-07-20 21:30:22,018 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:30:22,018 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 722 transitions. [2020-07-20 21:30:22,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1469 [2020-07-20 21:30:22,040 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:30:22,041 INFO L422 BasicCegarLoop]: trace histogram [117, 117, 98, 98, 89, 82, 58, 58, 58, 58, 58, 58, 58, 49, 49, 49, 49, 49, 49, 49, 40, 28, 24, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:30:22,241 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:30:22,242 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:30:22,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:30:22,243 INFO L82 PathProgramCache]: Analyzing trace with hash 205696894, now seen corresponding path program 17 times [2020-07-20 21:30:22,244 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:30:22,244 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [409072811] [2020-07-20 21:30:22,244 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:30:23,495 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:30:23,495 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:30:23,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 2744 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:30:23,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:30:24,689 INFO L134 CoverageAnalysis]: Checked inductivity of 64709 backedges. 848 proven. 3644 refuted. 0 times theorem prover too weak. 60217 trivial. 0 not checked. [2020-07-20 21:30:24,689 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:30:39,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:43,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:43,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:45,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:45,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:45,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:46,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:46,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:46,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:46,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:46,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:48,860 INFO L134 CoverageAnalysis]: Checked inductivity of 64709 backedges. 850 proven. 3672 refuted. 0 times theorem prover too weak. 60187 trivial. 0 not checked. [2020-07-20 21:30:48,861 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [409072811] [2020-07-20 21:30:48,861 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:30:48,861 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 21:30:48,862 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77681877] [2020-07-20 21:30:48,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:30:48,863 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:30:48,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:30:48,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:30:48,864 INFO L87 Difference]: Start difference. First operand 248 states and 722 transitions. Second operand 21 states. [2020-07-20 21:30:49,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:30:49,903 INFO L93 Difference]: Finished difference Result 400 states and 1594 transitions. [2020-07-20 21:30:49,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:30:49,908 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1468 [2020-07-20 21:30:49,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:30:49,918 INFO L225 Difference]: With dead ends: 400 [2020-07-20 21:30:49,918 INFO L226 Difference]: Without dead ends: 383 [2020-07-20 21:30:49,923 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2943 GetRequests, 2899 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:30:49,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2020-07-20 21:30:49,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 238. [2020-07-20 21:30:49,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2020-07-20 21:30:49,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 653 transitions. [2020-07-20 21:30:49,978 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 653 transitions. Word has length 1468 [2020-07-20 21:30:49,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:30:49,979 INFO L479 AbstractCegarLoop]: Abstraction has 238 states and 653 transitions. [2020-07-20 21:30:49,979 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:30:49,979 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 653 transitions. [2020-07-20 21:30:49,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1048 [2020-07-20 21:30:49,995 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:30:49,996 INFO L422 BasicCegarLoop]: trace histogram [79, 79, 74, 74, 62, 60, 39, 39, 39, 39, 39, 39, 39, 37, 37, 37, 37, 37, 37, 37, 23, 23, 19, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:30:50,196 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:30:50,197 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:30:50,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:30:50,198 INFO L82 PathProgramCache]: Analyzing trace with hash 736508429, now seen corresponding path program 18 times [2020-07-20 21:30:50,198 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:30:50,199 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [366433683] [2020-07-20 21:30:50,199 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:30:51,419 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:30:51,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:30:51,426 INFO L263 TraceCheckSpWp]: Trace formula consists of 1959 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 21:30:51,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:30:52,184 INFO L134 CoverageAnalysis]: Checked inductivity of 32417 backedges. 745 proven. 2069 refuted. 0 times theorem prover too weak. 29603 trivial. 0 not checked. [2020-07-20 21:30:52,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:31:00,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:00,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:05,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:05,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:07,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:07,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:08,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:08,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:08,453 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:08,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:08,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:10,133 INFO L134 CoverageAnalysis]: Checked inductivity of 32417 backedges. 745 proven. 2095 refuted. 0 times theorem prover too weak. 29577 trivial. 0 not checked. [2020-07-20 21:31:10,133 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [366433683] [2020-07-20 21:31:10,133 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:31:10,134 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 21:31:10,134 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2120505886] [2020-07-20 21:31:10,135 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 21:31:10,135 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:31:10,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 21:31:10,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:31:10,135 INFO L87 Difference]: Start difference. First operand 238 states and 653 transitions. Second operand 19 states. [2020-07-20 21:31:11,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:31:11,095 INFO L93 Difference]: Finished difference Result 489 states and 2374 transitions. [2020-07-20 21:31:11,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 21:31:11,100 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1047 [2020-07-20 21:31:11,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:31:11,114 INFO L225 Difference]: With dead ends: 489 [2020-07-20 21:31:11,115 INFO L226 Difference]: Without dead ends: 472 [2020-07-20 21:31:11,122 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2100 GetRequests, 2061 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 21:31:11,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2020-07-20 21:31:11,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 240. [2020-07-20 21:31:11,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2020-07-20 21:31:11,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 667 transitions. [2020-07-20 21:31:11,179 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 667 transitions. Word has length 1047 [2020-07-20 21:31:11,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:31:11,179 INFO L479 AbstractCegarLoop]: Abstraction has 240 states and 667 transitions. [2020-07-20 21:31:11,180 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 21:31:11,180 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 667 transitions. [2020-07-20 21:31:11,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1346 [2020-07-20 21:31:11,197 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:31:11,198 INFO L422 BasicCegarLoop]: trace histogram [102, 102, 95, 95, 81, 75, 51, 51, 51, 51, 51, 51, 51, 47, 47, 47, 47, 47, 47, 47, 34, 24, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:31:11,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:31:11,399 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:31:11,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:31:11,400 INFO L82 PathProgramCache]: Analyzing trace with hash 898832187, now seen corresponding path program 19 times [2020-07-20 21:31:11,400 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:31:11,400 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1137993268] [2020-07-20 21:31:11,401 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 21:31:12,698 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:31:12,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:31:12,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 2519 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 21:31:12,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:31:13,707 INFO L134 CoverageAnalysis]: Checked inductivity of 53903 backedges. 907 proven. 2734 refuted. 0 times theorem prover too weak. 50262 trivial. 0 not checked. [2020-07-20 21:31:13,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:31:25,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:25,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:31,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:35,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:35,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:36,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:36,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:36,327 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:36,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:36,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:36,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:36,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:37,340 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:39,274 INFO L134 CoverageAnalysis]: Checked inductivity of 53903 backedges. 909 proven. 2756 refuted. 0 times theorem prover too weak. 50238 trivial. 0 not checked. [2020-07-20 21:31:39,275 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1137993268] [2020-07-20 21:31:39,275 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:31:39,276 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 21:31:39,276 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014142597] [2020-07-20 21:31:39,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 21:31:39,277 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:31:39,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 21:31:39,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:31:39,278 INFO L87 Difference]: Start difference. First operand 240 states and 667 transitions. Second operand 19 states. [2020-07-20 21:31:40,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:31:40,402 INFO L93 Difference]: Finished difference Result 413 states and 1707 transitions. [2020-07-20 21:31:40,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 21:31:40,407 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1345 [2020-07-20 21:31:40,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:31:40,417 INFO L225 Difference]: With dead ends: 413 [2020-07-20 21:31:40,418 INFO L226 Difference]: Without dead ends: 395 [2020-07-20 21:31:40,421 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2696 GetRequests, 2657 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 21:31:40,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 395 states. [2020-07-20 21:31:40,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 395 to 251. [2020-07-20 21:31:40,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 251 states. [2020-07-20 21:31:40,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 710 transitions. [2020-07-20 21:31:40,476 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 710 transitions. Word has length 1345 [2020-07-20 21:31:40,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:31:40,477 INFO L479 AbstractCegarLoop]: Abstraction has 251 states and 710 transitions. [2020-07-20 21:31:40,478 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 21:31:40,478 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 710 transitions. [2020-07-20 21:31:40,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1480 [2020-07-20 21:31:40,509 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:31:40,509 INFO L422 BasicCegarLoop]: trace histogram [110, 110, 107, 107, 86, 84, 55, 55, 55, 55, 55, 55, 55, 53, 53, 53, 53, 53, 53, 53, 33, 29, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:31:40,723 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:31:40,724 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:31:40,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:31:40,725 INFO L82 PathProgramCache]: Analyzing trace with hash -1567338189, now seen corresponding path program 20 times [2020-07-20 21:31:40,725 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:31:40,725 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1950718420] [2020-07-20 21:31:40,725 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 21:31:42,195 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:31:42,195 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:31:42,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 2767 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:31:42,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:31:43,406 INFO L134 CoverageAnalysis]: Checked inductivity of 65257 backedges. 1066 proven. 3476 refuted. 0 times theorem prover too weak. 60715 trivial. 0 not checked. [2020-07-20 21:31:43,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:31:48,180 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:31:48,284 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 21:31:48,389 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 21:31:56,823 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:04,961 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:10,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:11,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:12,246 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:12,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:12,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:12,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:12,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:12,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:13,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:15,781 INFO L134 CoverageAnalysis]: Checked inductivity of 65257 backedges. 1066 proven. 3508 refuted. 0 times theorem prover too weak. 60683 trivial. 0 not checked. [2020-07-20 21:32:15,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1950718420] [2020-07-20 21:32:15,782 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:32:15,783 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 21:32:15,783 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1014821937] [2020-07-20 21:32:15,784 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:32:15,784 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:32:15,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:32:15,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:32:15,785 INFO L87 Difference]: Start difference. First operand 251 states and 710 transitions. Second operand 21 states. [2020-07-20 21:32:17,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:32:17,078 INFO L93 Difference]: Finished difference Result 368 states and 1310 transitions. [2020-07-20 21:32:17,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:32:17,082 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1479 [2020-07-20 21:32:17,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:32:17,094 INFO L225 Difference]: With dead ends: 368 [2020-07-20 21:32:17,095 INFO L226 Difference]: Without dead ends: 351 [2020-07-20 21:32:17,099 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2965 GetRequests, 2921 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:32:17,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 351 states. [2020-07-20 21:32:17,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 351 to 239. [2020-07-20 21:32:17,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 239 states. [2020-07-20 21:32:17,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 665 transitions. [2020-07-20 21:32:17,159 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 665 transitions. Word has length 1479 [2020-07-20 21:32:17,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:32:17,160 INFO L479 AbstractCegarLoop]: Abstraction has 239 states and 665 transitions. [2020-07-20 21:32:17,160 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:32:17,161 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 665 transitions. [2020-07-20 21:32:17,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 995 [2020-07-20 21:32:17,182 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:32:17,183 INFO L422 BasicCegarLoop]: trace histogram [73, 73, 72, 72, 59, 58, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 23, 22, 15, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:32:17,396 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:32:17,397 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:32:17,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:32:17,398 INFO L82 PathProgramCache]: Analyzing trace with hash 702148689, now seen corresponding path program 21 times [2020-07-20 21:32:17,399 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:32:17,399 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [944158142] [2020-07-20 21:32:17,399 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:32:18,958 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:32:18,959 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:32:18,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 1861 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:32:18,988 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:32:19,874 INFO L134 CoverageAnalysis]: Checked inductivity of 29140 backedges. 953 proven. 2458 refuted. 0 times theorem prover too weak. 25729 trivial. 0 not checked. [2020-07-20 21:32:19,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:32:22,372 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:32:22,476 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:32:23,212 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:32:23,323 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:32:24,153 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:32:24,259 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:32:24,373 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 21:32:24,497 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 21:32:24,616 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 21:32:24,733 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 21:32:24,843 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 21:32:24,947 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 21:32:32,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:32,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:37,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:37,109 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:40,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:40,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:42,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:42,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:43,541 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:43,541 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:44,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:44,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:44,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:44,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:44,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:44,686 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:44,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:45,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:48,082 INFO L134 CoverageAnalysis]: Checked inductivity of 29140 backedges. 957 proven. 2500 refuted. 0 times theorem prover too weak. 25683 trivial. 0 not checked. [2020-07-20 21:32:48,083 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [944158142] [2020-07-20 21:32:48,083 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:32:48,083 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 21:32:48,083 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1289171438] [2020-07-20 21:32:48,084 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:32:48,085 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:32:48,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:32:48,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:32:48,085 INFO L87 Difference]: Start difference. First operand 239 states and 665 transitions. Second operand 23 states. [2020-07-20 21:32:49,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:32:49,989 INFO L93 Difference]: Finished difference Result 379 states and 1361 transitions. [2020-07-20 21:32:49,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:32:49,995 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 994 [2020-07-20 21:32:49,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:32:50,005 INFO L225 Difference]: With dead ends: 379 [2020-07-20 21:32:50,006 INFO L226 Difference]: Without dead ends: 336 [2020-07-20 21:32:50,009 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1996 GetRequests, 1947 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:32:50,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 336 states. [2020-07-20 21:32:50,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 336 to 235. [2020-07-20 21:32:50,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 235 states. [2020-07-20 21:32:50,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 653 transitions. [2020-07-20 21:32:50,041 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 653 transitions. Word has length 994 [2020-07-20 21:32:50,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:32:50,041 INFO L479 AbstractCegarLoop]: Abstraction has 235 states and 653 transitions. [2020-07-20 21:32:50,041 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:32:50,041 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 653 transitions. [2020-07-20 21:32:50,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1106 [2020-07-20 21:32:50,057 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:32:50,058 INFO L422 BasicCegarLoop]: trace histogram [86, 86, 77, 77, 61, 59, 43, 43, 43, 43, 43, 43, 43, 38, 38, 38, 38, 38, 38, 38, 25, 23, 18, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:32:50,258 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:32:50,259 INFO L427 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:32:50,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:32:50,260 INFO L82 PathProgramCache]: Analyzing trace with hash -189265502, now seen corresponding path program 22 times [2020-07-20 21:32:50,261 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:32:50,261 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [419059948] [2020-07-20 21:32:50,262 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:32:51,569 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:32:51,569 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:32:51,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 2074 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:32:51,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:32:52,521 INFO L134 CoverageAnalysis]: Checked inductivity of 36289 backedges. 886 proven. 2463 refuted. 0 times theorem prover too weak. 32940 trivial. 0 not checked. [2020-07-20 21:32:52,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:32:55,963 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:32:56,066 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:32:57,369 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:32:57,482 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:32:57,603 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 21:32:57,724 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 21:32:57,842 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 21:32:57,951 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 21:33:07,911 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:33:08,122 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:33:08,227 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:33:08,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:08,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:14,128 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:16,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:17,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:17,763 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:18,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:18,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:18,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:19,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:21,311 INFO L134 CoverageAnalysis]: Checked inductivity of 36289 backedges. 890 proven. 2489 refuted. 0 times theorem prover too weak. 32910 trivial. 0 not checked. [2020-07-20 21:33:21,311 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [419059948] [2020-07-20 21:33:21,312 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:33:21,312 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 21:33:21,312 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236456190] [2020-07-20 21:33:21,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:33:21,314 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:33:21,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:33:21,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:33:21,315 INFO L87 Difference]: Start difference. First operand 235 states and 653 transitions. Second operand 21 states. [2020-07-20 21:33:22,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:33:22,831 INFO L93 Difference]: Finished difference Result 321 states and 1004 transitions. [2020-07-20 21:33:22,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:33:22,837 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1105 [2020-07-20 21:33:22,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:33:22,844 INFO L225 Difference]: With dead ends: 321 [2020-07-20 21:33:22,844 INFO L226 Difference]: Without dead ends: 301 [2020-07-20 21:33:22,847 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2217 GetRequests, 2173 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:33:22,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2020-07-20 21:33:22,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 222. [2020-07-20 21:33:22,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2020-07-20 21:33:22,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 571 transitions. [2020-07-20 21:33:22,876 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 571 transitions. Word has length 1105 [2020-07-20 21:33:22,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:33:22,878 INFO L479 AbstractCegarLoop]: Abstraction has 222 states and 571 transitions. [2020-07-20 21:33:22,878 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:33:22,878 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 571 transitions. [2020-07-20 21:33:22,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1343 [2020-07-20 21:33:22,898 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:33:22,898 INFO L422 BasicCegarLoop]: trace histogram [102, 102, 95, 95, 80, 73, 51, 51, 51, 51, 51, 51, 51, 47, 47, 47, 47, 47, 47, 47, 33, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:33:23,099 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:33:23,100 INFO L427 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:33:23,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:33:23,101 INFO L82 PathProgramCache]: Analyzing trace with hash 1116801941, now seen corresponding path program 23 times [2020-07-20 21:33:23,102 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:33:23,102 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1377296166] [2020-07-20 21:33:23,102 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:33:24,486 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:33:24,486 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:33:24,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 2513 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 21:33:24,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:33:25,414 INFO L134 CoverageAnalysis]: Checked inductivity of 53676 backedges. 803 proven. 2759 refuted. 0 times theorem prover too weak. 50114 trivial. 0 not checked. [2020-07-20 21:33:25,415 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:33:29,666 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:33:29,874 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 21:33:29,984 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 21:33:47,113 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:52,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:56,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:56,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:57,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:57,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:57,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:57,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:58,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:59,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:01,561 INFO L134 CoverageAnalysis]: Checked inductivity of 53676 backedges. 803 proven. 2782 refuted. 0 times theorem prover too weak. 50091 trivial. 0 not checked. [2020-07-20 21:34:01,562 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1377296166] [2020-07-20 21:34:01,562 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:34:01,562 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 21:34:01,563 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599626827] [2020-07-20 21:34:01,564 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 21:34:01,565 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:34:01,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 21:34:01,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:34:01,566 INFO L87 Difference]: Start difference. First operand 222 states and 571 transitions. Second operand 19 states. [2020-07-20 21:34:03,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:34:03,070 INFO L93 Difference]: Finished difference Result 378 states and 1331 transitions. [2020-07-20 21:34:03,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 21:34:03,078 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1342 [2020-07-20 21:34:03,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:34:03,087 INFO L225 Difference]: With dead ends: 378 [2020-07-20 21:34:03,088 INFO L226 Difference]: Without dead ends: 360 [2020-07-20 21:34:03,090 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2690 GetRequests, 2651 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 21:34:03,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2020-07-20 21:34:03,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 216. [2020-07-20 21:34:03,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2020-07-20 21:34:03,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 539 transitions. [2020-07-20 21:34:03,140 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 539 transitions. Word has length 1342 [2020-07-20 21:34:03,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:34:03,140 INFO L479 AbstractCegarLoop]: Abstraction has 216 states and 539 transitions. [2020-07-20 21:34:03,141 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 21:34:03,141 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 539 transitions. [2020-07-20 21:34:03,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1357 [2020-07-20 21:34:03,159 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:34:03,160 INFO L422 BasicCegarLoop]: trace histogram [102, 102, 97, 97, 80, 75, 51, 51, 51, 51, 51, 51, 51, 48, 48, 48, 48, 48, 48, 48, 32, 24, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:34:03,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:34:03,361 INFO L427 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:34:03,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:34:03,362 INFO L82 PathProgramCache]: Analyzing trace with hash 6886512, now seen corresponding path program 24 times [2020-07-20 21:34:03,363 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:34:03,363 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1831251962] [2020-07-20 21:34:03,364 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:34:04,789 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:34:04,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:34:04,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 2536 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:34:04,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:34:06,064 INFO L134 CoverageAnalysis]: Checked inductivity of 54775 backedges. 1087 proven. 3647 refuted. 0 times theorem prover too weak. 50041 trivial. 0 not checked. [2020-07-20 21:34:06,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:34:09,799 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:34:09,925 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:34:10,062 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:34:10,199 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:34:12,236 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:34:12,365 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:34:12,480 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 21:34:23,630 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:34:23,740 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:34:24,204 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:34:24,315 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:34:24,427 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:34:24,546 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:34:25,780 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:34:25,905 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:34:26,033 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:34:26,156 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:34:26,278 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 21:34:26,386 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 21:34:26,492 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 21:34:26,932 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:34,484 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:34:34,591 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:34:35,051 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:34:35,165 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:34:35,287 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:34:35,409 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:34:35,641 WARN L193 SmtUtils]: Spent 226.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 21:34:35,751 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 21:34:36,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:39,824 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:34:39,932 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:34:40,304 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:42,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:43,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:43,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:44,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:44,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:44,696 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:44,697 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:45,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:46,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:48,635 INFO L134 CoverageAnalysis]: Checked inductivity of 54775 backedges. 1093 proven. 3685 refuted. 0 times theorem prover too weak. 49997 trivial. 0 not checked. [2020-07-20 21:34:48,635 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1831251962] [2020-07-20 21:34:48,635 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:34:48,636 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 21:34:48,636 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529419858] [2020-07-20 21:34:48,637 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:34:48,638 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:34:48,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:34:48,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:34:48,639 INFO L87 Difference]: Start difference. First operand 216 states and 539 transitions. Second operand 23 states. [2020-07-20 21:34:50,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:34:50,828 INFO L93 Difference]: Finished difference Result 305 states and 840 transitions. [2020-07-20 21:34:50,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:34:50,836 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1356 [2020-07-20 21:34:50,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:34:50,843 INFO L225 Difference]: With dead ends: 305 [2020-07-20 21:34:50,843 INFO L226 Difference]: Without dead ends: 259 [2020-07-20 21:34:50,846 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2720 GetRequests, 2671 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:34:50,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2020-07-20 21:34:50,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 226. [2020-07-20 21:34:50,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 226 states. [2020-07-20 21:34:50,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 597 transitions. [2020-07-20 21:34:50,884 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 597 transitions. Word has length 1356 [2020-07-20 21:34:50,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:34:50,885 INFO L479 AbstractCegarLoop]: Abstraction has 226 states and 597 transitions. [2020-07-20 21:34:50,885 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:34:50,885 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 597 transitions. [2020-07-20 21:34:50,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1411 [2020-07-20 21:34:50,917 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:34:50,918 INFO L422 BasicCegarLoop]: trace histogram [106, 106, 101, 101, 81, 80, 53, 53, 53, 53, 53, 53, 53, 50, 50, 50, 50, 50, 50, 50, 30, 28, 26, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:34:51,132 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:34:51,133 INFO L427 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:34:51,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:34:51,134 INFO L82 PathProgramCache]: Analyzing trace with hash -1461063614, now seen corresponding path program 25 times [2020-07-20 21:34:51,135 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:34:51,135 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [69229099] [2020-07-20 21:34:51,136 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:34:52,639 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:34:52,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:34:52,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 2640 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:34:52,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:34:53,795 INFO L134 CoverageAnalysis]: Checked inductivity of 59272 backedges. 1105 proven. 3294 refuted. 0 times theorem prover too weak. 54873 trivial. 0 not checked. [2020-07-20 21:34:53,796 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:34:56,635 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:34:56,748 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:34:57,804 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:34:57,920 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:34:58,047 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:34:58,173 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:35:00,829 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:35:00,958 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:35:01,099 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 21:35:01,239 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 21:35:01,379 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 21:35:01,509 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 21:35:01,625 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 21:35:01,758 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:35:01,861 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 21:35:21,132 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:35:21,248 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:35:21,374 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:35:21,502 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:35:21,623 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 21:35:21,729 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 21:35:22,099 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:22,100 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:29,680 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 21:35:29,794 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:35:29,908 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:35:30,017 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 21:35:30,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:30,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:32,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:34,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:34,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:34,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:35,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:35,469 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:35,764 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:36,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:41,742 INFO L134 CoverageAnalysis]: Checked inductivity of 59272 backedges. 1109 proven. 3323 refuted. 0 times theorem prover too weak. 54840 trivial. 0 not checked. [2020-07-20 21:35:41,742 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [69229099] [2020-07-20 21:35:41,743 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:35:41,743 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 21:35:41,743 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898292411] [2020-07-20 21:35:41,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:35:41,744 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:41,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:35:41,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:35:41,745 INFO L87 Difference]: Start difference. First operand 226 states and 597 transitions. Second operand 21 states. [2020-07-20 21:35:43,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:43,619 INFO L93 Difference]: Finished difference Result 357 states and 1259 transitions. [2020-07-20 21:35:43,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:35:43,628 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1410 [2020-07-20 21:35:43,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:43,638 INFO L225 Difference]: With dead ends: 357 [2020-07-20 21:35:43,638 INFO L226 Difference]: Without dead ends: 348 [2020-07-20 21:35:43,641 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2827 GetRequests, 2783 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:35:43,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2020-07-20 21:35:43,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 275. [2020-07-20 21:35:43,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 275 states. [2020-07-20 21:35:43,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 870 transitions. [2020-07-20 21:35:43,685 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 870 transitions. Word has length 1410 [2020-07-20 21:35:43,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:43,686 INFO L479 AbstractCegarLoop]: Abstraction has 275 states and 870 transitions. [2020-07-20 21:35:43,686 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:35:43,686 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 870 transitions. [2020-07-20 21:35:43,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1342 [2020-07-20 21:35:43,706 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:43,707 INFO L422 BasicCegarLoop]: trace histogram [107, 107, 92, 92, 72, 68, 53, 53, 53, 53, 53, 53, 53, 46, 46, 46, 46, 46, 46, 46, 39, 22, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:43,907 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:43,908 INFO L427 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:43,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:43,909 INFO L82 PathProgramCache]: Analyzing trace with hash 248907734, now seen corresponding path program 26 times [2020-07-20 21:35:43,910 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:43,910 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1604842879] [2020-07-20 21:35:43,910 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:45,439 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:35:45,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:45,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 2518 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 21:35:45,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:46,915 INFO L134 CoverageAnalysis]: Checked inductivity of 53914 backedges. 1639 proven. 3538 refuted. 0 times theorem prover too weak. 48737 trivial. 0 not checked. [2020-07-20 21:35:46,915 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:35:49,824 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 21:35:49,929 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 21:35:50,043 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 21:35:50,159 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 21:35:50,746 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 21:35:50,878 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 21:35:51,015 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:35:51,155 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:35:51,300 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:35:51,447 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:35:51,604 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:35:51,768 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:35:52,984 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:35:53,151 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:35:53,328 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 21:35:53,502 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 21:35:55,470 WARN L193 SmtUtils]: Spent 179.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 21:35:55,653 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 21:35:55,845 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 21:35:56,037 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 21:35:56,227 WARN L193 SmtUtils]: Spent 183.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 21:35:56,402 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 21:35:56,559 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 21:35:56,708 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 21:35:56,858 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 21:35:56,999 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 21:35:57,126 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 21:35:57,241 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 21:35:57,349 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:35:57,455 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-07-20 21:36:06,916 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 21:36:10,586 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 21:36:10,697 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 21:36:11,300 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 21:36:11,405 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 21:36:11,517 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:36:11,628 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:36:11,748 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:36:11,867 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:36:11,998 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:36:12,124 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:36:12,973 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:36:13,111 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:36:13,260 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 50