/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/loop-invgen/fragtest_simple.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 22:28:39,218 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-20 22:28:39,237 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 22:28:39,238 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 22:28:39,239 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 22:28:39,243 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 22:28:39,253 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 22:28:39,255 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 22:28:39,258 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 22:28:39,260 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 22:28:39,260 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 22:28:39,261 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 22:28:39,265 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 22:28:39,267 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 22:28:39,268 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 22:28:39,269 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 22:28:39,271 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 22:28:39,274 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 22:28:39,276 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 22:28:39,277 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 22:28:39,278 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 22:28:39,279 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 22:28:39,282 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 22:28:39,290 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 22:28:39,291 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 22:28:39,292 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 22:28:39,295 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 22:28:39,311 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 22:28:39,312 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 22:28:39,313 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 22:28:39,313 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 22:28:39,314 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 22:28:39,314 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 22:28:39,314 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 22:28:39,314 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 22:28:39,314 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 22:28:39,315 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 22:28:39,315 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 22:28:39,315 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 22:28:39,315 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 22:28:39,315 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 22:28:39,316 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 22:28:39,316 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 22:28:39,316 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 22:28:39,316 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 22:28:39,316 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 22:28:39,317 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 22:28:39,317 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 22:28:39,317 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 22:28:39,317 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 22:28:39,318 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 22:28:39,318 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 22:28:39,318 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 22:28:39,318 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:39,318 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 22:28:39,319 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 22:28:39,319 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 22:28:39,611 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 22:28:39,628 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 22:28:39,634 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 22:28:39,636 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 22:28:39,636 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 22:28:39,637 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/fragtest_simple.i [2020-07-20 22:28:39,737 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/152b95d36/29ca37ef00414e9bbaa1499103ce35ba/FLAGe082d71f1 [2020-07-20 22:28:40,265 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 22:28:40,266 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/fragtest_simple.i [2020-07-20 22:28:40,273 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/152b95d36/29ca37ef00414e9bbaa1499103ce35ba/FLAGe082d71f1 [2020-07-20 22:28:40,635 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/152b95d36/29ca37ef00414e9bbaa1499103ce35ba [2020-07-20 22:28:40,645 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 22:28:40,648 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 22:28:40,649 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 22:28:40,650 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 22:28:40,655 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 22:28:40,656 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:28:40" (1/1) ... [2020-07-20 22:28:40,660 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@53b756ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:28:40, skipping insertion in model container [2020-07-20 22:28:40,660 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:28:40" (1/1) ... [2020-07-20 22:28:40,669 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 22:28:40,690 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 22:28:40,885 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:28:40,891 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 22:28:40,913 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:28:40,930 INFO L208 MainTranslator]: Completed translation [2020-07-20 22:28:40,930 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:28:40 WrapperNode [2020-07-20 22:28:40,930 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 22:28:40,931 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 22:28:40,931 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 22:28:40,931 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 22:28:40,944 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:28:40" (1/1) ... [2020-07-20 22:28:40,945 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:28:40" (1/1) ... [2020-07-20 22:28:40,950 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:28:40" (1/1) ... [2020-07-20 22:28:40,951 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:28:40" (1/1) ... [2020-07-20 22:28:41,027 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:28:40" (1/1) ... [2020-07-20 22:28:41,033 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:28:40" (1/1) ... [2020-07-20 22:28:41,039 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:28:40" (1/1) ... [2020-07-20 22:28:41,041 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 22:28:41,042 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 22:28:41,042 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 22:28:41,042 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 22:28:41,043 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:28:40" (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 22:28:41,112 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 22:28:41,113 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 22:28:41,113 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 22:28:41,113 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 22:28:41,113 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 22:28:41,114 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 22:28:41,114 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 22:28:41,115 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 22:28:41,115 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 22:28:41,115 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 22:28:41,116 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 22:28:41,116 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 22:28:41,117 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 22:28:41,339 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 22:28:41,340 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-20 22:28:41,344 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:28:41 BoogieIcfgContainer [2020-07-20 22:28:41,345 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 22:28:41,346 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 22:28:41,347 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 22:28:41,351 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 22:28:41,351 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 10:28:40" (1/3) ... [2020-07-20 22:28:41,352 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@517ff61b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:28:41, skipping insertion in model container [2020-07-20 22:28:41,352 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:28:40" (2/3) ... [2020-07-20 22:28:41,353 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@517ff61b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:28:41, skipping insertion in model container [2020-07-20 22:28:41,353 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:28:41" (3/3) ... [2020-07-20 22:28:41,355 INFO L109 eAbstractionObserver]: Analyzing ICFG fragtest_simple.i [2020-07-20 22:28:41,369 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 22:28:41,384 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 22:28:41,439 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 22:28:41,492 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 22:28:41,492 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 22:28:41,493 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 22:28:41,493 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 22:28:41,493 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 22:28:41,493 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 22:28:41,493 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 22:28:41,494 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 22:28:41,523 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-07-20 22:28:41,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-20 22:28:41,531 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:41,532 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:41,532 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:41,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:41,538 INFO L82 PathProgramCache]: Analyzing trace with hash 317368997, now seen corresponding path program 1 times [2020-07-20 22:28:41,549 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:41,549 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1304461315] [2020-07-20 22:28:41,550 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 22:28:41,626 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:28:41,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:41,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 22:28:41,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:41,696 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:28:41,736 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 22:28:41,736 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:28:41,737 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1304461315] [2020-07-20 22:28:41,738 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:28:41,738 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 22:28:41,739 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479363756] [2020-07-20 22:28:41,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 22:28:41,745 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:41,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 22:28:41,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 22:28:41,764 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 5 states. [2020-07-20 22:28:41,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:41,863 INFO L93 Difference]: Finished difference Result 54 states and 73 transitions. [2020-07-20 22:28:41,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 22:28:41,865 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-07-20 22:28:41,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:41,876 INFO L225 Difference]: With dead ends: 54 [2020-07-20 22:28:41,876 INFO L226 Difference]: Without dead ends: 29 [2020-07-20 22:28:41,883 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 11 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 22:28:41,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-20 22:28:41,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2020-07-20 22:28:41,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 22:28:41,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2020-07-20 22:28:41,926 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 15 [2020-07-20 22:28:41,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:41,926 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2020-07-20 22:28:41,927 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 22:28:41,927 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2020-07-20 22:28:41,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 22:28:41,928 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:41,928 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] [2020-07-20 22:28:42,143 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:42,143 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:42,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:42,144 INFO L82 PathProgramCache]: Analyzing trace with hash -1401298672, now seen corresponding path program 1 times [2020-07-20 22:28:42,144 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:42,144 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [635186099] [2020-07-20 22:28:42,144 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 22:28:42,189 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:28:42,189 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:42,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 22:28:42,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:42,240 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:28:42,240 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:28:42,241 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [635186099] [2020-07-20 22:28:42,241 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:28:42,241 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 22:28:42,242 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128621603] [2020-07-20 22:28:42,243 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 22:28:42,244 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:42,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 22:28:42,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-07-20 22:28:42,245 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 5 states. [2020-07-20 22:28:42,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:42,348 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2020-07-20 22:28:42,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 22:28:42,349 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 25 [2020-07-20 22:28:42,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:42,353 INFO L225 Difference]: With dead ends: 49 [2020-07-20 22:28:42,354 INFO L226 Difference]: Without dead ends: 34 [2020-07-20 22:28:42,355 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-07-20 22:28:42,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-20 22:28:42,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2020-07-20 22:28:42,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 22:28:42,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2020-07-20 22:28:42,368 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 25 [2020-07-20 22:28:42,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:42,369 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2020-07-20 22:28:42,369 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 22:28:42,369 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2020-07-20 22:28:42,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 22:28:42,370 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:42,370 INFO L422 BasicCegarLoop]: trace histogram [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 22:28:42,584 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:42,584 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:42,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:42,585 INFO L82 PathProgramCache]: Analyzing trace with hash 1107622837, now seen corresponding path program 1 times [2020-07-20 22:28:42,585 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:42,585 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [238559339] [2020-07-20 22:28:42,586 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 22:28:42,625 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:42,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:42,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 22:28:42,630 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:42,705 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:28:42,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:42,790 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:28:42,791 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [238559339] [2020-07-20 22:28:42,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:28:42,793 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-07-20 22:28:42,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426503748] [2020-07-20 22:28:42,794 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 22:28:42,795 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:42,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 22:28:42,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-20 22:28:42,797 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand 8 states. [2020-07-20 22:28:42,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:42,957 INFO L93 Difference]: Finished difference Result 55 states and 64 transitions. [2020-07-20 22:28:42,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 22:28:42,958 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-07-20 22:28:42,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:42,960 INFO L225 Difference]: With dead ends: 55 [2020-07-20 22:28:42,960 INFO L226 Difference]: Without dead ends: 40 [2020-07-20 22:28:42,962 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2020-07-20 22:28:42,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-07-20 22:28:42,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 32. [2020-07-20 22:28:42,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-20 22:28:42,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-07-20 22:28:42,974 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 27 [2020-07-20 22:28:42,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:42,975 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-07-20 22:28:42,975 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 22:28:42,975 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-07-20 22:28:42,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 22:28:42,976 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:42,988 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:43,198 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:43,200 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:43,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:43,200 INFO L82 PathProgramCache]: Analyzing trace with hash -1590427366, now seen corresponding path program 2 times [2020-07-20 22:28:43,201 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:43,201 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [880974575] [2020-07-20 22:28:43,202 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 22:28:43,240 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:43,240 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:43,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 22:28:43,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:43,272 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:28:43,293 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:28:43,293 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:43,315 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:28:43,365 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:28:43,366 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [880974575] [2020-07-20 22:28:43,366 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:28:43,366 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-07-20 22:28:43,367 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688240167] [2020-07-20 22:28:43,367 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 22:28:43,367 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:43,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 22:28:43,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-20 22:28:43,368 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 8 states. [2020-07-20 22:28:43,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:43,437 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2020-07-20 22:28:43,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 22:28:43,438 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-07-20 22:28:43,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:43,439 INFO L225 Difference]: With dead ends: 51 [2020-07-20 22:28:43,440 INFO L226 Difference]: Without dead ends: 49 [2020-07-20 22:28:43,440 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 47 SyntacticMatches, 4 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-20 22:28:43,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-20 22:28:43,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 44. [2020-07-20 22:28:43,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-20 22:28:43,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2020-07-20 22:28:43,449 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 29 [2020-07-20 22:28:43,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:43,450 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2020-07-20 22:28:43,450 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 22:28:43,450 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2020-07-20 22:28:43,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-20 22:28:43,452 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:43,453 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:43,666 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:43,666 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:43,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:43,667 INFO L82 PathProgramCache]: Analyzing trace with hash -30298372, now seen corresponding path program 3 times [2020-07-20 22:28:43,668 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:43,668 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1686325212] [2020-07-20 22:28:43,669 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 22:28:43,705 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:43,705 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:43,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 22:28:43,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:43,791 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 28 proven. 6 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-07-20 22:28:43,791 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:43,882 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 22 proven. 6 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-07-20 22:28:43,882 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1686325212] [2020-07-20 22:28:43,883 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:28:43,883 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2020-07-20 22:28:43,885 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118203447] [2020-07-20 22:28:43,885 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 22:28:43,886 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:43,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 22:28:43,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-07-20 22:28:43,890 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 11 states. [2020-07-20 22:28:44,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:44,022 INFO L93 Difference]: Finished difference Result 83 states and 96 transitions. [2020-07-20 22:28:44,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 22:28:44,025 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 45 [2020-07-20 22:28:44,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:44,027 INFO L225 Difference]: With dead ends: 83 [2020-07-20 22:28:44,027 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 22:28:44,029 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 77 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-07-20 22:28:44,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 22:28:44,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 46. [2020-07-20 22:28:44,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 22:28:44,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-07-20 22:28:44,053 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 45 [2020-07-20 22:28:44,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:44,053 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-07-20 22:28:44,053 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 22:28:44,054 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-07-20 22:28:44,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-07-20 22:28:44,057 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:44,059 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:44,260 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:44,260 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:44,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:44,261 INFO L82 PathProgramCache]: Analyzing trace with hash 130155809, now seen corresponding path program 4 times [2020-07-20 22:28:44,261 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:44,261 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1104248107] [2020-07-20 22:28:44,262 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 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 22:28:44,318 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:44,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:44,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 22:28:44,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:44,423 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 22:28:44,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:44,521 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 22:28:44,521 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1104248107] [2020-07-20 22:28:44,522 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:28:44,522 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2020-07-20 22:28:44,523 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78221511] [2020-07-20 22:28:44,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 22:28:44,524 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:44,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 22:28:44,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2020-07-20 22:28:44,524 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 14 states. [2020-07-20 22:28:44,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:44,732 INFO L93 Difference]: Finished difference Result 87 states and 103 transitions. [2020-07-20 22:28:44,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 22:28:44,733 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 47 [2020-07-20 22:28:44,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:44,738 INFO L225 Difference]: With dead ends: 87 [2020-07-20 22:28:44,738 INFO L226 Difference]: Without dead ends: 64 [2020-07-20 22:28:44,739 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 77 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2020-07-20 22:28:44,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-20 22:28:44,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 48. [2020-07-20 22:28:44,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-20 22:28:44,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2020-07-20 22:28:44,758 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 47 [2020-07-20 22:28:44,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:44,759 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2020-07-20 22:28:44,759 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 22:28:44,759 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2020-07-20 22:28:44,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-20 22:28:44,762 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:44,762 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:44,979 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:44,980 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:44,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:44,981 INFO L82 PathProgramCache]: Analyzing trace with hash -292198906, now seen corresponding path program 5 times [2020-07-20 22:28:44,981 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:44,982 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1472848481] [2020-07-20 22:28:44,983 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 22:28:45,030 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:45,030 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:45,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 22:28:45,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:45,085 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:28:45,114 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 26 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 22:28:45,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:45,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:28:45,194 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 26 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 22:28:45,195 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1472848481] [2020-07-20 22:28:45,195 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:28:45,195 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-07-20 22:28:45,195 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543349660] [2020-07-20 22:28:45,196 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 22:28:45,196 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:45,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 22:28:45,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-07-20 22:28:45,197 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand 10 states. [2020-07-20 22:28:45,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:45,299 INFO L93 Difference]: Finished difference Result 67 states and 73 transitions. [2020-07-20 22:28:45,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 22:28:45,300 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 49 [2020-07-20 22:28:45,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:45,301 INFO L225 Difference]: With dead ends: 67 [2020-07-20 22:28:45,302 INFO L226 Difference]: Without dead ends: 65 [2020-07-20 22:28:45,303 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 81 SyntacticMatches, 8 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 22:28:45,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-07-20 22:28:45,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 60. [2020-07-20 22:28:45,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 22:28:45,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 65 transitions. [2020-07-20 22:28:45,313 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 65 transitions. Word has length 49 [2020-07-20 22:28:45,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:45,313 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 65 transitions. [2020-07-20 22:28:45,313 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 22:28:45,314 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 65 transitions. [2020-07-20 22:28:45,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 22:28:45,315 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:45,315 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:45,518 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:45,519 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:45,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:45,520 INFO L82 PathProgramCache]: Analyzing trace with hash 551795688, now seen corresponding path program 6 times [2020-07-20 22:28:45,520 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:45,521 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [506101420] [2020-07-20 22:28:45,522 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 22:28:45,569 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:45,569 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:45,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 22:28:45,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:45,729 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 72 proven. 20 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-20 22:28:45,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:45,845 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 58 proven. 20 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2020-07-20 22:28:45,846 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [506101420] [2020-07-20 22:28:45,846 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:28:45,846 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 17 [2020-07-20 22:28:45,847 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712293125] [2020-07-20 22:28:45,848 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 22:28:45,848 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:45,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 22:28:45,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2020-07-20 22:28:45,849 INFO L87 Difference]: Start difference. First operand 60 states and 65 transitions. Second operand 17 states. [2020-07-20 22:28:46,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:46,081 INFO L93 Difference]: Finished difference Result 115 states and 135 transitions. [2020-07-20 22:28:46,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 22:28:46,081 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 65 [2020-07-20 22:28:46,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:46,083 INFO L225 Difference]: With dead ends: 115 [2020-07-20 22:28:46,083 INFO L226 Difference]: Without dead ends: 82 [2020-07-20 22:28:46,084 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 109 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2020-07-20 22:28:46,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-20 22:28:46,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 62. [2020-07-20 22:28:46,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-07-20 22:28:46,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2020-07-20 22:28:46,101 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 65 [2020-07-20 22:28:46,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:46,102 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2020-07-20 22:28:46,102 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 22:28:46,102 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2020-07-20 22:28:46,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 22:28:46,104 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:46,104 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:46,309 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:46,310 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:46,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:46,310 INFO L82 PathProgramCache]: Analyzing trace with hash -150434419, now seen corresponding path program 7 times [2020-07-20 22:28:46,311 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:46,311 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [686028867] [2020-07-20 22:28:46,312 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 22:28:46,353 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:46,353 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:46,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 22:28:46,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:46,511 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 60 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 22:28:46,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:46,674 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 60 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 22:28:46,675 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [686028867] [2020-07-20 22:28:46,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:28:46,675 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 20 [2020-07-20 22:28:46,675 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1341763657] [2020-07-20 22:28:46,677 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 22:28:46,678 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:46,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 22:28:46,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2020-07-20 22:28:46,679 INFO L87 Difference]: Start difference. First operand 62 states and 67 transitions. Second operand 20 states. [2020-07-20 22:28:46,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:46,949 INFO L93 Difference]: Finished difference Result 119 states and 142 transitions. [2020-07-20 22:28:46,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 22:28:46,950 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 67 [2020-07-20 22:28:46,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:46,951 INFO L225 Difference]: With dead ends: 119 [2020-07-20 22:28:46,951 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 22:28:46,952 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 109 SyntacticMatches, 6 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2020-07-20 22:28:46,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 22:28:46,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 64. [2020-07-20 22:28:46,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-20 22:28:46,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 69 transitions. [2020-07-20 22:28:46,960 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 69 transitions. Word has length 67 [2020-07-20 22:28:46,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:46,961 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 69 transitions. [2020-07-20 22:28:46,961 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 22:28:46,961 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 69 transitions. [2020-07-20 22:28:46,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-20 22:28:46,962 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:46,962 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:47,178 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:47,179 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:47,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:47,179 INFO L82 PathProgramCache]: Analyzing trace with hash -683701774, now seen corresponding path program 8 times [2020-07-20 22:28:47,180 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:47,181 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [366256508] [2020-07-20 22:28:47,181 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 22:28:47,242 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:47,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:47,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 22:28:47,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:47,320 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:28:47,341 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 52 proven. 50 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 22:28:47,341 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:47,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:28:47,454 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 52 proven. 50 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 22:28:47,454 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [366256508] [2020-07-20 22:28:47,455 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:28:47,455 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-07-20 22:28:47,455 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1457207328] [2020-07-20 22:28:47,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 22:28:47,456 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:47,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 22:28:47,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2020-07-20 22:28:47,457 INFO L87 Difference]: Start difference. First operand 64 states and 69 transitions. Second operand 12 states. [2020-07-20 22:28:47,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:47,562 INFO L93 Difference]: Finished difference Result 83 states and 90 transitions. [2020-07-20 22:28:47,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 22:28:47,562 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 69 [2020-07-20 22:28:47,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:47,564 INFO L225 Difference]: With dead ends: 83 [2020-07-20 22:28:47,564 INFO L226 Difference]: Without dead ends: 81 [2020-07-20 22:28:47,565 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 115 SyntacticMatches, 12 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=53, Invalid=103, Unknown=0, NotChecked=0, Total=156 [2020-07-20 22:28:47,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-20 22:28:47,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 76. [2020-07-20 22:28:47,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 22:28:47,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2020-07-20 22:28:47,575 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 69 [2020-07-20 22:28:47,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:47,575 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2020-07-20 22:28:47,576 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 22:28:47,576 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2020-07-20 22:28:47,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-07-20 22:28:47,577 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:47,578 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:47,791 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:47,792 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:47,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:47,792 INFO L82 PathProgramCache]: Analyzing trace with hash 192972756, now seen corresponding path program 9 times [2020-07-20 22:28:47,792 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:47,793 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1474165849] [2020-07-20 22:28:47,793 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 22:28:47,841 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:47,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:47,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 22:28:47,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:48,028 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 132 proven. 42 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-07-20 22:28:48,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:48,204 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 110 proven. 42 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2020-07-20 22:28:48,205 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1474165849] [2020-07-20 22:28:48,205 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:28:48,205 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 23 [2020-07-20 22:28:48,205 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782607292] [2020-07-20 22:28:48,206 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 22:28:48,206 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:48,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 22:28:48,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 22:28:48,207 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand 23 states. [2020-07-20 22:28:48,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:48,520 INFO L93 Difference]: Finished difference Result 147 states and 174 transitions. [2020-07-20 22:28:48,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 22:28:48,520 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 85 [2020-07-20 22:28:48,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:48,522 INFO L225 Difference]: With dead ends: 147 [2020-07-20 22:28:48,522 INFO L226 Difference]: Without dead ends: 106 [2020-07-20 22:28:48,523 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 141 SyntacticMatches, 7 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2020-07-20 22:28:48,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-07-20 22:28:48,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 78. [2020-07-20 22:28:48,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-07-20 22:28:48,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 84 transitions. [2020-07-20 22:28:48,531 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 84 transitions. Word has length 85 [2020-07-20 22:28:48,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:48,532 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 84 transitions. [2020-07-20 22:28:48,532 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 22:28:48,532 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 84 transitions. [2020-07-20 22:28:48,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-07-20 22:28:48,533 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:48,534 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:48,746 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:48,747 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:48,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:48,748 INFO L82 PathProgramCache]: Analyzing trace with hash 1722356985, now seen corresponding path program 10 times [2020-07-20 22:28:48,748 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:48,749 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1421607447] [2020-07-20 22:28:48,749 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:48,796 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:48,797 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:48,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 22:28:48,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:49,024 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 112 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-20 22:28:49,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:49,226 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 112 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-20 22:28:49,227 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1421607447] [2020-07-20 22:28:49,227 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:28:49,227 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 26 [2020-07-20 22:28:49,228 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [6181285] [2020-07-20 22:28:49,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 22:28:49,231 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:49,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 22:28:49,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=481, Unknown=0, NotChecked=0, Total=650 [2020-07-20 22:28:49,234 INFO L87 Difference]: Start difference. First operand 78 states and 84 transitions. Second operand 26 states. [2020-07-20 22:28:49,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:49,627 INFO L93 Difference]: Finished difference Result 151 states and 181 transitions. [2020-07-20 22:28:49,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 22:28:49,628 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 87 [2020-07-20 22:28:49,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:49,629 INFO L225 Difference]: With dead ends: 151 [2020-07-20 22:28:49,629 INFO L226 Difference]: Without dead ends: 112 [2020-07-20 22:28:49,630 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 141 SyntacticMatches, 8 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 22:28:49,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-20 22:28:49,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 80. [2020-07-20 22:28:49,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-20 22:28:49,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 86 transitions. [2020-07-20 22:28:49,639 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 86 transitions. Word has length 87 [2020-07-20 22:28:49,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:49,640 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 86 transitions. [2020-07-20 22:28:49,640 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 22:28:49,640 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 86 transitions. [2020-07-20 22:28:49,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-07-20 22:28:49,641 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:49,642 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:49,856 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:49,856 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:49,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:49,857 INFO L82 PathProgramCache]: Analyzing trace with hash -1713181474, now seen corresponding path program 11 times [2020-07-20 22:28:49,857 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:49,858 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2019953024] [2020-07-20 22:28:49,858 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 22:28:49,912 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:49,913 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:49,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 22:28:49,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:50,001 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:28:50,029 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 86 proven. 98 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-20 22:28:50,029 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:50,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:28:50,207 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 86 proven. 98 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-20 22:28:50,208 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2019953024] [2020-07-20 22:28:50,208 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:28:50,208 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-07-20 22:28:50,208 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580040629] [2020-07-20 22:28:50,211 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 22:28:50,212 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:50,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 22:28:50,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2020-07-20 22:28:50,213 INFO L87 Difference]: Start difference. First operand 80 states and 86 transitions. Second operand 14 states. [2020-07-20 22:28:50,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:50,356 INFO L93 Difference]: Finished difference Result 99 states and 107 transitions. [2020-07-20 22:28:50,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 22:28:50,356 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 89 [2020-07-20 22:28:50,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:50,357 INFO L225 Difference]: With dead ends: 99 [2020-07-20 22:28:50,358 INFO L226 Difference]: Without dead ends: 97 [2020-07-20 22:28:50,358 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 149 SyntacticMatches, 16 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=74, Invalid=136, Unknown=0, NotChecked=0, Total=210 [2020-07-20 22:28:50,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-20 22:28:50,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 92. [2020-07-20 22:28:50,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-07-20 22:28:50,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 99 transitions. [2020-07-20 22:28:50,367 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 99 transitions. Word has length 89 [2020-07-20 22:28:50,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:50,368 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 99 transitions. [2020-07-20 22:28:50,368 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 22:28:50,368 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 99 transitions. [2020-07-20 22:28:50,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-07-20 22:28:50,369 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:50,369 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:50,570 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:50,571 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:50,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:50,571 INFO L82 PathProgramCache]: Analyzing trace with hash -1950838080, now seen corresponding path program 12 times [2020-07-20 22:28:50,572 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:50,572 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [646603580] [2020-07-20 22:28:50,573 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 22:28:50,626 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:50,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:50,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 22:28:50,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:50,845 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 208 proven. 72 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2020-07-20 22:28:50,846 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:51,170 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 178 proven. 72 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2020-07-20 22:28:51,171 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [646603580] [2020-07-20 22:28:51,171 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:28:51,171 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 29 [2020-07-20 22:28:51,171 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2147220397] [2020-07-20 22:28:51,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 22:28:51,172 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:51,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 22:28:51,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=604, Unknown=0, NotChecked=0, Total=812 [2020-07-20 22:28:51,173 INFO L87 Difference]: Start difference. First operand 92 states and 99 transitions. Second operand 29 states. [2020-07-20 22:28:51,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:51,626 INFO L93 Difference]: Finished difference Result 179 states and 213 transitions. [2020-07-20 22:28:51,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 22:28:51,626 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 105 [2020-07-20 22:28:51,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:51,627 INFO L225 Difference]: With dead ends: 179 [2020-07-20 22:28:51,627 INFO L226 Difference]: Without dead ends: 130 [2020-07-20 22:28:51,629 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 173 SyntacticMatches, 9 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 316 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 22:28:51,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-07-20 22:28:51,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 94. [2020-07-20 22:28:51,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-07-20 22:28:51,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 101 transitions. [2020-07-20 22:28:51,638 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 101 transitions. Word has length 105 [2020-07-20 22:28:51,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:51,638 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 101 transitions. [2020-07-20 22:28:51,639 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 22:28:51,639 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 101 transitions. [2020-07-20 22:28:51,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-07-20 22:28:51,640 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:51,640 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:51,849 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:51,849 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:51,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:51,850 INFO L82 PathProgramCache]: Analyzing trace with hash -734782619, now seen corresponding path program 13 times [2020-07-20 22:28:51,850 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:51,851 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1925805197] [2020-07-20 22:28:51,851 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 22:28:51,910 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:51,910 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:51,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 22:28:51,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:52,175 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 180 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-20 22:28:52,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:52,477 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 180 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-20 22:28:52,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1925805197] [2020-07-20 22:28:52,478 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:28:52,478 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 32 [2020-07-20 22:28:52,478 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [459629251] [2020-07-20 22:28:52,479 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-20 22:28:52,479 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:52,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-20 22:28:52,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=741, Unknown=0, NotChecked=0, Total=992 [2020-07-20 22:28:52,480 INFO L87 Difference]: Start difference. First operand 94 states and 101 transitions. Second operand 32 states. [2020-07-20 22:28:52,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:52,980 INFO L93 Difference]: Finished difference Result 183 states and 220 transitions. [2020-07-20 22:28:52,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 22:28:52,980 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 107 [2020-07-20 22:28:52,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:52,982 INFO L225 Difference]: With dead ends: 183 [2020-07-20 22:28:52,982 INFO L226 Difference]: Without dead ends: 136 [2020-07-20 22:28:52,984 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 173 SyntacticMatches, 10 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 396 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2020-07-20 22:28:52,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2020-07-20 22:28:52,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 96. [2020-07-20 22:28:52,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-07-20 22:28:52,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 103 transitions. [2020-07-20 22:28:52,992 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 103 transitions. Word has length 107 [2020-07-20 22:28:52,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:52,992 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 103 transitions. [2020-07-20 22:28:52,992 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-20 22:28:52,992 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 103 transitions. [2020-07-20 22:28:52,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 22:28:52,993 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:52,994 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:53,207 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:53,208 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:53,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:53,209 INFO L82 PathProgramCache]: Analyzing trace with hash -336589110, now seen corresponding path program 14 times [2020-07-20 22:28:53,209 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:53,210 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1933586] [2020-07-20 22:28:53,210 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 22:28:53,266 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:53,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:53,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 22:28:53,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:53,356 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:28:53,388 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 128 proven. 162 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-20 22:28:53,388 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:53,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:28:53,606 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 128 proven. 162 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-20 22:28:53,607 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1933586] [2020-07-20 22:28:53,607 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:28:53,607 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-07-20 22:28:53,608 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865226046] [2020-07-20 22:28:53,608 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 22:28:53,608 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:53,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 22:28:53,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=145, Unknown=0, NotChecked=0, Total=240 [2020-07-20 22:28:53,609 INFO L87 Difference]: Start difference. First operand 96 states and 103 transitions. Second operand 16 states. [2020-07-20 22:28:53,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:53,774 INFO L93 Difference]: Finished difference Result 115 states and 124 transitions. [2020-07-20 22:28:53,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 22:28:53,775 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 109 [2020-07-20 22:28:53,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:53,776 INFO L225 Difference]: With dead ends: 115 [2020-07-20 22:28:53,776 INFO L226 Difference]: Without dead ends: 113 [2020-07-20 22:28:53,779 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 183 SyntacticMatches, 20 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=99, Invalid=173, Unknown=0, NotChecked=0, Total=272 [2020-07-20 22:28:53,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-20 22:28:53,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 108. [2020-07-20 22:28:53,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-20 22:28:53,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 116 transitions. [2020-07-20 22:28:53,787 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 116 transitions. Word has length 109 [2020-07-20 22:28:53,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:53,788 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 116 transitions. [2020-07-20 22:28:53,788 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 22:28:53,788 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 116 transitions. [2020-07-20 22:28:53,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2020-07-20 22:28:53,789 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:53,789 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:53,996 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:53,996 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:53,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:53,997 INFO L82 PathProgramCache]: Analyzing trace with hash 1711037612, now seen corresponding path program 15 times [2020-07-20 22:28:53,997 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:53,997 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [555387920] [2020-07-20 22:28:53,998 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 22:28:54,062 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:54,063 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:54,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 22:28:54,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:54,356 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 300 proven. 110 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2020-07-20 22:28:54,356 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:54,735 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 262 proven. 110 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-07-20 22:28:54,735 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [555387920] [2020-07-20 22:28:54,735 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:28:54,736 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 35 [2020-07-20 22:28:54,736 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070842931] [2020-07-20 22:28:54,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-20 22:28:54,737 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:54,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-20 22:28:54,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=892, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 22:28:54,738 INFO L87 Difference]: Start difference. First operand 108 states and 116 transitions. Second operand 35 states. [2020-07-20 22:28:55,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:55,278 INFO L93 Difference]: Finished difference Result 211 states and 252 transitions. [2020-07-20 22:28:55,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 22:28:55,278 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 125 [2020-07-20 22:28:55,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:55,280 INFO L225 Difference]: With dead ends: 211 [2020-07-20 22:28:55,280 INFO L226 Difference]: Without dead ends: 154 [2020-07-20 22:28:55,281 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 205 SyntacticMatches, 11 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 485 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 22:28:55,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2020-07-20 22:28:55,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 110. [2020-07-20 22:28:55,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-20 22:28:55,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 118 transitions. [2020-07-20 22:28:55,288 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 118 transitions. Word has length 125 [2020-07-20 22:28:55,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:55,288 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 118 transitions. [2020-07-20 22:28:55,289 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-20 22:28:55,289 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 118 transitions. [2020-07-20 22:28:55,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-07-20 22:28:55,290 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:55,290 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:55,491 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:55,492 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:55,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:55,493 INFO L82 PathProgramCache]: Analyzing trace with hash 66724049, now seen corresponding path program 16 times [2020-07-20 22:28:55,493 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:55,493 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1648911317] [2020-07-20 22:28:55,494 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 22:28:55,549 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:55,549 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:55,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 22:28:55,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:55,900 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 264 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-20 22:28:55,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:56,414 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 264 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-20 22:28:56,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1648911317] [2020-07-20 22:28:56,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:28:56,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 38 [2020-07-20 22:28:56,418 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2106913508] [2020-07-20 22:28:56,423 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-20 22:28:56,423 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:56,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-20 22:28:56,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=1057, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 22:28:56,425 INFO L87 Difference]: Start difference. First operand 110 states and 118 transitions. Second operand 38 states. [2020-07-20 22:28:57,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:57,043 INFO L93 Difference]: Finished difference Result 215 states and 259 transitions. [2020-07-20 22:28:57,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 22:28:57,044 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 127 [2020-07-20 22:28:57,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:57,046 INFO L225 Difference]: With dead ends: 215 [2020-07-20 22:28:57,046 INFO L226 Difference]: Without dead ends: 160 [2020-07-20 22:28:57,048 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 205 SyntacticMatches, 12 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 583 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=673, Invalid=1777, Unknown=0, NotChecked=0, Total=2450 [2020-07-20 22:28:57,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2020-07-20 22:28:57,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 112. [2020-07-20 22:28:57,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-07-20 22:28:57,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 120 transitions. [2020-07-20 22:28:57,056 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 120 transitions. Word has length 127 [2020-07-20 22:28:57,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:57,056 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 120 transitions. [2020-07-20 22:28:57,056 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-20 22:28:57,056 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 120 transitions. [2020-07-20 22:28:57,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-07-20 22:28:57,058 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:57,058 INFO L422 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:57,272 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:57,273 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:57,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:57,273 INFO L82 PathProgramCache]: Analyzing trace with hash 429354934, now seen corresponding path program 17 times [2020-07-20 22:28:57,273 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:57,273 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2087353629] [2020-07-20 22:28:57,273 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 22:28:57,333 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:57,333 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:57,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-20 22:28:57,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:57,459 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:28:57,490 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 178 proven. 242 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-20 22:28:57,490 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:57,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:28:57,797 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 178 proven. 242 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-20 22:28:57,797 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2087353629] [2020-07-20 22:28:57,797 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:28:57,798 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-07-20 22:28:57,798 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256810600] [2020-07-20 22:28:57,799 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 22:28:57,799 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:57,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 22:28:57,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=182, Unknown=0, NotChecked=0, Total=306 [2020-07-20 22:28:57,800 INFO L87 Difference]: Start difference. First operand 112 states and 120 transitions. Second operand 18 states. [2020-07-20 22:28:57,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:57,963 INFO L93 Difference]: Finished difference Result 131 states and 141 transitions. [2020-07-20 22:28:57,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 22:28:57,963 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 129 [2020-07-20 22:28:57,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:57,965 INFO L225 Difference]: With dead ends: 131 [2020-07-20 22:28:57,965 INFO L226 Difference]: Without dead ends: 129 [2020-07-20 22:28:57,966 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 217 SyntacticMatches, 24 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=128, Invalid=214, Unknown=0, NotChecked=0, Total=342 [2020-07-20 22:28:57,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2020-07-20 22:28:57,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 124. [2020-07-20 22:28:57,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-07-20 22:28:57,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 133 transitions. [2020-07-20 22:28:57,976 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 133 transitions. Word has length 129 [2020-07-20 22:28:57,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:57,977 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 133 transitions. [2020-07-20 22:28:57,977 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 22:28:57,977 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 133 transitions. [2020-07-20 22:28:57,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-20 22:28:57,979 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:57,979 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:28:58,192 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:28:58,193 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:28:58,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:28:58,193 INFO L82 PathProgramCache]: Analyzing trace with hash 1971086744, now seen corresponding path program 18 times [2020-07-20 22:28:58,193 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:28:58,194 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [311501410] [2020-07-20 22:28:58,194 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 22:28:58,293 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:28:58,294 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:28:58,296 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 22:28:58,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:28:58,705 INFO L134 CoverageAnalysis]: Checked inductivity of 832 backedges. 408 proven. 156 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2020-07-20 22:28:58,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:28:59,269 INFO L134 CoverageAnalysis]: Checked inductivity of 832 backedges. 362 proven. 156 refuted. 0 times theorem prover too weak. 314 trivial. 0 not checked. [2020-07-20 22:28:59,269 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [311501410] [2020-07-20 22:28:59,269 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:28:59,270 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 41 [2020-07-20 22:28:59,270 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1639759567] [2020-07-20 22:28:59,271 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-07-20 22:28:59,271 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:28:59,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-07-20 22:28:59,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=1236, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 22:28:59,273 INFO L87 Difference]: Start difference. First operand 124 states and 133 transitions. Second operand 41 states. [2020-07-20 22:28:59,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:28:59,951 INFO L93 Difference]: Finished difference Result 243 states and 291 transitions. [2020-07-20 22:28:59,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-20 22:28:59,952 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 145 [2020-07-20 22:28:59,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:28:59,954 INFO L225 Difference]: With dead ends: 243 [2020-07-20 22:28:59,954 INFO L226 Difference]: Without dead ends: 178 [2020-07-20 22:28:59,956 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 237 SyntacticMatches, 13 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 690 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=781, Invalid=2081, Unknown=0, NotChecked=0, Total=2862 [2020-07-20 22:28:59,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-07-20 22:28:59,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 126. [2020-07-20 22:28:59,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2020-07-20 22:28:59,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 135 transitions. [2020-07-20 22:28:59,965 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 135 transitions. Word has length 145 [2020-07-20 22:28:59,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:28:59,965 INFO L479 AbstractCegarLoop]: Abstraction has 126 states and 135 transitions. [2020-07-20 22:28:59,965 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-07-20 22:28:59,965 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 135 transitions. [2020-07-20 22:28:59,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2020-07-20 22:28:59,967 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:28:59,967 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:00,174 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:00,175 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:00,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:00,176 INFO L82 PathProgramCache]: Analyzing trace with hash 554411325, now seen corresponding path program 19 times [2020-07-20 22:29:00,176 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:00,176 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1582689807] [2020-07-20 22:29:00,177 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 22:29:00,245 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:00,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:00,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-20 22:29:00,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:29:00,699 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 364 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-20 22:29:00,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:29:01,249 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 364 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-20 22:29:01,250 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1582689807] [2020-07-20 22:29:01,250 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:29:01,250 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 44 [2020-07-20 22:29:01,250 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1863181801] [2020-07-20 22:29:01,251 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-20 22:29:01,251 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:29:01,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-20 22:29:01,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1429, Unknown=0, NotChecked=0, Total=1892 [2020-07-20 22:29:01,252 INFO L87 Difference]: Start difference. First operand 126 states and 135 transitions. Second operand 44 states. [2020-07-20 22:29:02,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:29:02,039 INFO L93 Difference]: Finished difference Result 247 states and 298 transitions. [2020-07-20 22:29:02,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-20 22:29:02,039 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 147 [2020-07-20 22:29:02,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:29:02,040 INFO L225 Difference]: With dead ends: 247 [2020-07-20 22:29:02,041 INFO L226 Difference]: Without dead ends: 184 [2020-07-20 22:29:02,043 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 237 SyntacticMatches, 14 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 806 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=897, Invalid=2409, Unknown=0, NotChecked=0, Total=3306 [2020-07-20 22:29:02,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2020-07-20 22:29:02,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 128. [2020-07-20 22:29:02,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2020-07-20 22:29:02,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 137 transitions. [2020-07-20 22:29:02,052 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 137 transitions. Word has length 147 [2020-07-20 22:29:02,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:29:02,052 INFO L479 AbstractCegarLoop]: Abstraction has 128 states and 137 transitions. [2020-07-20 22:29:02,052 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-20 22:29:02,053 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 137 transitions. [2020-07-20 22:29:02,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2020-07-20 22:29:02,054 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:29:02,054 INFO L422 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:02,262 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:02,263 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:02,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:02,264 INFO L82 PathProgramCache]: Analyzing trace with hash 633966498, now seen corresponding path program 20 times [2020-07-20 22:29:02,264 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:02,264 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [298404245] [2020-07-20 22:29:02,265 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 22:29:02,329 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:02,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:02,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 31 conjunts are in the unsatisfiable core [2020-07-20 22:29:02,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:29:02,497 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:29:02,540 INFO L134 CoverageAnalysis]: Checked inductivity of 886 backedges. 236 proven. 338 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-20 22:29:02,540 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:29:02,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:29:02,858 INFO L134 CoverageAnalysis]: Checked inductivity of 886 backedges. 236 proven. 338 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-20 22:29:02,859 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [298404245] [2020-07-20 22:29:02,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:29:02,859 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-07-20 22:29:02,859 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146323073] [2020-07-20 22:29:02,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 22:29:02,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:29:02,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 22:29:02,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=223, Unknown=0, NotChecked=0, Total=380 [2020-07-20 22:29:02,860 INFO L87 Difference]: Start difference. First operand 128 states and 137 transitions. Second operand 20 states. [2020-07-20 22:29:03,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:29:03,091 INFO L93 Difference]: Finished difference Result 147 states and 158 transitions. [2020-07-20 22:29:03,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 22:29:03,094 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 149 [2020-07-20 22:29:03,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:29:03,095 INFO L225 Difference]: With dead ends: 147 [2020-07-20 22:29:03,095 INFO L226 Difference]: Without dead ends: 145 [2020-07-20 22:29:03,096 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 251 SyntacticMatches, 28 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 293 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=161, Invalid=259, Unknown=0, NotChecked=0, Total=420 [2020-07-20 22:29:03,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2020-07-20 22:29:03,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 140. [2020-07-20 22:29:03,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-07-20 22:29:03,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 150 transitions. [2020-07-20 22:29:03,103 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 150 transitions. Word has length 149 [2020-07-20 22:29:03,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:29:03,104 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 150 transitions. [2020-07-20 22:29:03,104 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 22:29:03,104 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 150 transitions. [2020-07-20 22:29:03,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2020-07-20 22:29:03,105 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:29:03,105 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 15, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:03,319 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:03,320 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:03,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:03,320 INFO L82 PathProgramCache]: Analyzing trace with hash -869716604, now seen corresponding path program 21 times [2020-07-20 22:29:03,321 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:03,321 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1205802426] [2020-07-20 22:29:03,321 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 22:29:03,402 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:03,403 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:03,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 399 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-20 22:29:03,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:29:03,927 INFO L134 CoverageAnalysis]: Checked inductivity of 1110 backedges. 532 proven. 210 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-20 22:29:03,927 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:29:04,637 INFO L134 CoverageAnalysis]: Checked inductivity of 1110 backedges. 478 proven. 210 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-20 22:29:04,638 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1205802426] [2020-07-20 22:29:04,638 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:29:04,638 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32] total 47 [2020-07-20 22:29:04,638 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400032227] [2020-07-20 22:29:04,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-07-20 22:29:04,639 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:29:04,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-07-20 22:29:04,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1636, Unknown=0, NotChecked=0, Total=2162 [2020-07-20 22:29:04,641 INFO L87 Difference]: Start difference. First operand 140 states and 150 transitions. Second operand 47 states. [2020-07-20 22:29:05,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:29:05,439 INFO L93 Difference]: Finished difference Result 275 states and 330 transitions. [2020-07-20 22:29:05,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-20 22:29:05,439 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 165 [2020-07-20 22:29:05,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:29:05,442 INFO L225 Difference]: With dead ends: 275 [2020-07-20 22:29:05,442 INFO L226 Difference]: Without dead ends: 202 [2020-07-20 22:29:05,444 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 269 SyntacticMatches, 15 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 931 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1021, Invalid=2761, Unknown=0, NotChecked=0, Total=3782 [2020-07-20 22:29:05,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-20 22:29:05,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 142. [2020-07-20 22:29:05,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2020-07-20 22:29:05,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 152 transitions. [2020-07-20 22:29:05,453 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 152 transitions. Word has length 165 [2020-07-20 22:29:05,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:29:05,454 INFO L479 AbstractCegarLoop]: Abstraction has 142 states and 152 transitions. [2020-07-20 22:29:05,454 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-07-20 22:29:05,454 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 152 transitions. [2020-07-20 22:29:05,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2020-07-20 22:29:05,455 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:29:05,455 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:05,658 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:05,658 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:05,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:05,659 INFO L82 PathProgramCache]: Analyzing trace with hash -583456599, now seen corresponding path program 22 times [2020-07-20 22:29:05,660 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:05,660 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1307181784] [2020-07-20 22:29:05,660 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 22:29:05,734 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:05,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:05,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 407 conjuncts, 34 conjunts are in the unsatisfiable core [2020-07-20 22:29:05,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:29:06,336 INFO L134 CoverageAnalysis]: Checked inductivity of 1140 backedges. 480 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-20 22:29:06,337 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:29:07,034 INFO L134 CoverageAnalysis]: Checked inductivity of 1140 backedges. 480 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-20 22:29:07,035 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1307181784] [2020-07-20 22:29:07,035 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:29:07,035 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34] total 50 [2020-07-20 22:29:07,035 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1274673245] [2020-07-20 22:29:07,036 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-20 22:29:07,036 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:29:07,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-20 22:29:07,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=593, Invalid=1857, Unknown=0, NotChecked=0, Total=2450 [2020-07-20 22:29:07,037 INFO L87 Difference]: Start difference. First operand 142 states and 152 transitions. Second operand 50 states. [2020-07-20 22:29:08,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:29:08,128 INFO L93 Difference]: Finished difference Result 279 states and 337 transitions. [2020-07-20 22:29:08,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 22:29:08,129 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 167 [2020-07-20 22:29:08,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:29:08,131 INFO L225 Difference]: With dead ends: 279 [2020-07-20 22:29:08,132 INFO L226 Difference]: Without dead ends: 208 [2020-07-20 22:29:08,135 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 269 SyntacticMatches, 16 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1065 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1153, Invalid=3137, Unknown=0, NotChecked=0, Total=4290 [2020-07-20 22:29:08,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2020-07-20 22:29:08,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 144. [2020-07-20 22:29:08,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-20 22:29:08,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 154 transitions. [2020-07-20 22:29:08,150 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 154 transitions. Word has length 167 [2020-07-20 22:29:08,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:29:08,150 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 154 transitions. [2020-07-20 22:29:08,151 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-20 22:29:08,151 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 154 transitions. [2020-07-20 22:29:08,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2020-07-20 22:29:08,153 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:29:08,153 INFO L422 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:08,368 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:08,369 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:08,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:08,370 INFO L82 PathProgramCache]: Analyzing trace with hash -365498738, now seen corresponding path program 23 times [2020-07-20 22:29:08,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:08,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [78327669] [2020-07-20 22:29:08,370 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 22:29:08,467 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:08,468 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:08,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-20 22:29:08,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:29:08,676 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:29:08,722 INFO L134 CoverageAnalysis]: Checked inductivity of 1172 backedges. 302 proven. 450 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-20 22:29:08,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:29:08,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:29:09,123 INFO L134 CoverageAnalysis]: Checked inductivity of 1172 backedges. 302 proven. 450 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-20 22:29:09,123 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [78327669] [2020-07-20 22:29:09,123 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:29:09,124 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2020-07-20 22:29:09,124 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919587249] [2020-07-20 22:29:09,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 22:29:09,124 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:29:09,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 22:29:09,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=268, Unknown=0, NotChecked=0, Total=462 [2020-07-20 22:29:09,125 INFO L87 Difference]: Start difference. First operand 144 states and 154 transitions. Second operand 22 states. [2020-07-20 22:29:09,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:29:09,345 INFO L93 Difference]: Finished difference Result 163 states and 175 transitions. [2020-07-20 22:29:09,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 22:29:09,345 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 169 [2020-07-20 22:29:09,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:29:09,347 INFO L225 Difference]: With dead ends: 163 [2020-07-20 22:29:09,347 INFO L226 Difference]: Without dead ends: 161 [2020-07-20 22:29:09,347 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 285 SyntacticMatches, 32 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 367 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=198, Invalid=308, Unknown=0, NotChecked=0, Total=506 [2020-07-20 22:29:09,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2020-07-20 22:29:09,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 156. [2020-07-20 22:29:09,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2020-07-20 22:29:09,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 167 transitions. [2020-07-20 22:29:09,357 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 167 transitions. Word has length 169 [2020-07-20 22:29:09,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:29:09,358 INFO L479 AbstractCegarLoop]: Abstraction has 156 states and 167 transitions. [2020-07-20 22:29:09,358 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 22:29:09,359 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 167 transitions. [2020-07-20 22:29:09,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2020-07-20 22:29:09,361 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:29:09,361 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 17, 17, 17, 17, 17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:09,574 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:09,575 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:09,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:09,576 INFO L82 PathProgramCache]: Analyzing trace with hash -760007568, now seen corresponding path program 24 times [2020-07-20 22:29:09,576 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:09,576 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [627789481] [2020-07-20 22:29:09,576 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 22:29:09,706 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:09,706 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:09,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-20 22:29:09,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:29:10,435 INFO L134 CoverageAnalysis]: Checked inductivity of 1428 backedges. 672 proven. 272 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2020-07-20 22:29:10,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:29:11,218 INFO L134 CoverageAnalysis]: Checked inductivity of 1428 backedges. 610 proven. 272 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2020-07-20 22:29:11,219 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [627789481] [2020-07-20 22:29:11,219 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:29:11,219 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36] total 53 [2020-07-20 22:29:11,219 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733243626] [2020-07-20 22:29:11,220 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-07-20 22:29:11,220 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:29:11,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-07-20 22:29:11,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=664, Invalid=2092, Unknown=0, NotChecked=0, Total=2756 [2020-07-20 22:29:11,221 INFO L87 Difference]: Start difference. First operand 156 states and 167 transitions. Second operand 53 states. [2020-07-20 22:29:12,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:29:12,424 INFO L93 Difference]: Finished difference Result 307 states and 369 transitions. [2020-07-20 22:29:12,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-20 22:29:12,424 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 185 [2020-07-20 22:29:12,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:29:12,427 INFO L225 Difference]: With dead ends: 307 [2020-07-20 22:29:12,427 INFO L226 Difference]: Without dead ends: 226 [2020-07-20 22:29:12,430 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 301 SyntacticMatches, 17 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1208 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1293, Invalid=3537, Unknown=0, NotChecked=0, Total=4830 [2020-07-20 22:29:12,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2020-07-20 22:29:12,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 158. [2020-07-20 22:29:12,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2020-07-20 22:29:12,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 169 transitions. [2020-07-20 22:29:12,447 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 169 transitions. Word has length 185 [2020-07-20 22:29:12,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:29:12,448 INFO L479 AbstractCegarLoop]: Abstraction has 158 states and 169 transitions. [2020-07-20 22:29:12,448 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-07-20 22:29:12,448 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 169 transitions. [2020-07-20 22:29:12,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2020-07-20 22:29:12,450 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:29:12,451 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:12,666 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:12,667 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:12,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:12,668 INFO L82 PathProgramCache]: Analyzing trace with hash -1861014763, now seen corresponding path program 25 times [2020-07-20 22:29:12,668 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:12,668 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [92161891] [2020-07-20 22:29:12,668 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 22:29:12,785 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:12,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:12,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 456 conjuncts, 38 conjunts are in the unsatisfiable core [2020-07-20 22:29:12,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:29:13,548 INFO L134 CoverageAnalysis]: Checked inductivity of 1462 backedges. 612 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-20 22:29:13,548 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:29:14,444 INFO L134 CoverageAnalysis]: Checked inductivity of 1462 backedges. 612 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-20 22:29:14,445 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [92161891] [2020-07-20 22:29:14,445 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:29:14,445 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38] total 56 [2020-07-20 22:29:14,446 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646841382] [2020-07-20 22:29:14,446 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-07-20 22:29:14,446 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:29:14,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-07-20 22:29:14,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=739, Invalid=2341, Unknown=0, NotChecked=0, Total=3080 [2020-07-20 22:29:14,448 INFO L87 Difference]: Start difference. First operand 158 states and 169 transitions. Second operand 56 states. [2020-07-20 22:29:15,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:29:15,649 INFO L93 Difference]: Finished difference Result 311 states and 376 transitions. [2020-07-20 22:29:15,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-20 22:29:15,650 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 187 [2020-07-20 22:29:15,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:29:15,652 INFO L225 Difference]: With dead ends: 311 [2020-07-20 22:29:15,653 INFO L226 Difference]: Without dead ends: 232 [2020-07-20 22:29:15,655 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 301 SyntacticMatches, 18 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1360 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1441, Invalid=3961, Unknown=0, NotChecked=0, Total=5402 [2020-07-20 22:29:15,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2020-07-20 22:29:15,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 160. [2020-07-20 22:29:15,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2020-07-20 22:29:15,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 171 transitions. [2020-07-20 22:29:15,667 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 171 transitions. Word has length 187 [2020-07-20 22:29:15,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:29:15,668 INFO L479 AbstractCegarLoop]: Abstraction has 160 states and 171 transitions. [2020-07-20 22:29:15,668 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-07-20 22:29:15,668 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 171 transitions. [2020-07-20 22:29:15,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-20 22:29:15,670 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:29:15,670 INFO L422 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:15,884 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:15,885 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:15,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:15,885 INFO L82 PathProgramCache]: Analyzing trace with hash 927992954, now seen corresponding path program 26 times [2020-07-20 22:29:15,886 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:15,886 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [126202095] [2020-07-20 22:29:15,886 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 22:29:15,969 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:15,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:15,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 467 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-20 22:29:15,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:29:16,233 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:29:16,314 INFO L134 CoverageAnalysis]: Checked inductivity of 1498 backedges. 376 proven. 578 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-20 22:29:16,315 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:29:16,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:29:16,855 INFO L134 CoverageAnalysis]: Checked inductivity of 1498 backedges. 376 proven. 578 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-20 22:29:16,855 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [126202095] [2020-07-20 22:29:16,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:29:16,855 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2020-07-20 22:29:16,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196007093] [2020-07-20 22:29:16,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 22:29:16,856 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:29:16,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 22:29:16,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=317, Unknown=0, NotChecked=0, Total=552 [2020-07-20 22:29:16,857 INFO L87 Difference]: Start difference. First operand 160 states and 171 transitions. Second operand 24 states. [2020-07-20 22:29:17,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:29:17,129 INFO L93 Difference]: Finished difference Result 179 states and 192 transitions. [2020-07-20 22:29:17,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 22:29:17,130 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 189 [2020-07-20 22:29:17,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:29:17,133 INFO L225 Difference]: With dead ends: 179 [2020-07-20 22:29:17,133 INFO L226 Difference]: Without dead ends: 177 [2020-07-20 22:29:17,134 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 319 SyntacticMatches, 36 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 449 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=239, Invalid=361, Unknown=0, NotChecked=0, Total=600 [2020-07-20 22:29:17,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2020-07-20 22:29:17,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 172. [2020-07-20 22:29:17,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2020-07-20 22:29:17,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 184 transitions. [2020-07-20 22:29:17,144 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 184 transitions. Word has length 189 [2020-07-20 22:29:17,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:29:17,145 INFO L479 AbstractCegarLoop]: Abstraction has 172 states and 184 transitions. [2020-07-20 22:29:17,145 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 22:29:17,146 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 184 transitions. [2020-07-20 22:29:17,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2020-07-20 22:29:17,147 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:29:17,148 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 19, 19, 19, 19, 19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:17,361 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:17,362 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:17,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:17,362 INFO L82 PathProgramCache]: Analyzing trace with hash 1753938524, now seen corresponding path program 27 times [2020-07-20 22:29:17,363 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:17,363 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [935425656] [2020-07-20 22:29:17,363 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 22:29:17,491 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:17,492 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:17,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 497 conjuncts, 40 conjunts are in the unsatisfiable core [2020-07-20 22:29:17,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:29:18,344 INFO L134 CoverageAnalysis]: Checked inductivity of 1786 backedges. 828 proven. 342 refuted. 0 times theorem prover too weak. 616 trivial. 0 not checked. [2020-07-20 22:29:18,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:29:19,289 INFO L134 CoverageAnalysis]: Checked inductivity of 1786 backedges. 758 proven. 342 refuted. 0 times theorem prover too weak. 686 trivial. 0 not checked. [2020-07-20 22:29:19,290 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [935425656] [2020-07-20 22:29:19,290 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:29:19,290 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40] total 59 [2020-07-20 22:29:19,290 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [925767147] [2020-07-20 22:29:19,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-07-20 22:29:19,291 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:29:19,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-07-20 22:29:19,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=818, Invalid=2604, Unknown=0, NotChecked=0, Total=3422 [2020-07-20 22:29:19,292 INFO L87 Difference]: Start difference. First operand 172 states and 184 transitions. Second operand 59 states. [2020-07-20 22:29:20,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:29:20,552 INFO L93 Difference]: Finished difference Result 339 states and 408 transitions. [2020-07-20 22:29:20,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-20 22:29:20,552 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 205 [2020-07-20 22:29:20,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:29:20,554 INFO L225 Difference]: With dead ends: 339 [2020-07-20 22:29:20,554 INFO L226 Difference]: Without dead ends: 250 [2020-07-20 22:29:20,556 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 428 GetRequests, 333 SyntacticMatches, 19 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1521 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1597, Invalid=4409, Unknown=0, NotChecked=0, Total=6006 [2020-07-20 22:29:20,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-07-20 22:29:20,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 174. [2020-07-20 22:29:20,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2020-07-20 22:29:20,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 186 transitions. [2020-07-20 22:29:20,565 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 186 transitions. Word has length 205 [2020-07-20 22:29:20,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:29:20,566 INFO L479 AbstractCegarLoop]: Abstraction has 174 states and 186 transitions. [2020-07-20 22:29:20,566 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-07-20 22:29:20,566 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 186 transitions. [2020-07-20 22:29:20,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2020-07-20 22:29:20,567 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:29:20,567 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 19, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:20,780 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:20,781 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:20,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:20,782 INFO L82 PathProgramCache]: Analyzing trace with hash 1542073473, now seen corresponding path program 28 times [2020-07-20 22:29:20,782 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:20,782 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [674033746] [2020-07-20 22:29:20,782 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 22:29:20,870 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:20,871 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:20,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 505 conjuncts, 42 conjunts are in the unsatisfiable core [2020-07-20 22:29:20,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:29:21,817 INFO L134 CoverageAnalysis]: Checked inductivity of 1824 backedges. 760 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-20 22:29:21,818 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:29:22,904 INFO L134 CoverageAnalysis]: Checked inductivity of 1824 backedges. 760 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-20 22:29:22,904 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [674033746] [2020-07-20 22:29:22,904 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:29:22,904 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42] total 62 [2020-07-20 22:29:22,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178013191] [2020-07-20 22:29:22,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-07-20 22:29:22,905 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:29:22,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-07-20 22:29:22,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=901, Invalid=2881, Unknown=0, NotChecked=0, Total=3782 [2020-07-20 22:29:22,906 INFO L87 Difference]: Start difference. First operand 174 states and 186 transitions. Second operand 62 states. [2020-07-20 22:29:24,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:29:24,282 INFO L93 Difference]: Finished difference Result 343 states and 415 transitions. [2020-07-20 22:29:24,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-20 22:29:24,282 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 207 [2020-07-20 22:29:24,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:29:24,284 INFO L225 Difference]: With dead ends: 343 [2020-07-20 22:29:24,284 INFO L226 Difference]: Without dead ends: 256 [2020-07-20 22:29:24,286 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 333 SyntacticMatches, 20 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1691 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1761, Invalid=4881, Unknown=0, NotChecked=0, Total=6642 [2020-07-20 22:29:24,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2020-07-20 22:29:24,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 176. [2020-07-20 22:29:24,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-20 22:29:24,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 188 transitions. [2020-07-20 22:29:24,296 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 188 transitions. Word has length 207 [2020-07-20 22:29:24,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:29:24,296 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 188 transitions. [2020-07-20 22:29:24,297 INFO L480 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-07-20 22:29:24,297 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 188 transitions. [2020-07-20 22:29:24,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2020-07-20 22:29:24,298 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:29:24,298 INFO L422 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:24,511 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:24,512 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:24,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:24,513 INFO L82 PathProgramCache]: Analyzing trace with hash -196777626, now seen corresponding path program 29 times [2020-07-20 22:29:24,513 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:24,513 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [293842532] [2020-07-20 22:29:24,514 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 22:29:24,607 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:24,607 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:24,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 516 conjuncts, 43 conjunts are in the unsatisfiable core [2020-07-20 22:29:24,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:29:24,907 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:29:24,966 INFO L134 CoverageAnalysis]: Checked inductivity of 1864 backedges. 458 proven. 722 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-20 22:29:24,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:29:24,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:29:25,593 INFO L134 CoverageAnalysis]: Checked inductivity of 1864 backedges. 458 proven. 722 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-20 22:29:25,593 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [293842532] [2020-07-20 22:29:25,593 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:29:25,593 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2020-07-20 22:29:25,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596789772] [2020-07-20 22:29:25,594 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 22:29:25,594 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:29:25,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 22:29:25,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=370, Unknown=0, NotChecked=0, Total=650 [2020-07-20 22:29:25,594 INFO L87 Difference]: Start difference. First operand 176 states and 188 transitions. Second operand 26 states. [2020-07-20 22:29:25,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:29:25,872 INFO L93 Difference]: Finished difference Result 195 states and 209 transitions. [2020-07-20 22:29:25,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 22:29:25,873 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 209 [2020-07-20 22:29:25,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:29:25,875 INFO L225 Difference]: With dead ends: 195 [2020-07-20 22:29:25,875 INFO L226 Difference]: Without dead ends: 193 [2020-07-20 22:29:25,876 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 353 SyntacticMatches, 40 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=284, Invalid=418, Unknown=0, NotChecked=0, Total=702 [2020-07-20 22:29:25,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2020-07-20 22:29:25,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 188. [2020-07-20 22:29:25,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2020-07-20 22:29:25,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 201 transitions. [2020-07-20 22:29:25,888 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 201 transitions. Word has length 209 [2020-07-20 22:29:25,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:29:25,889 INFO L479 AbstractCegarLoop]: Abstraction has 188 states and 201 transitions. [2020-07-20 22:29:25,889 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 22:29:25,889 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 201 transitions. [2020-07-20 22:29:25,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2020-07-20 22:29:25,891 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:29:25,891 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 21, 21, 21, 21, 21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:26,104 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:26,105 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:26,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:26,105 INFO L82 PathProgramCache]: Analyzing trace with hash 65077064, now seen corresponding path program 30 times [2020-07-20 22:29:26,106 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:26,106 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [28503996] [2020-07-20 22:29:26,106 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 22:29:26,205 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:26,205 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:26,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 546 conjuncts, 44 conjunts are in the unsatisfiable core [2020-07-20 22:29:26,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:29:27,238 INFO L134 CoverageAnalysis]: Checked inductivity of 2184 backedges. 1000 proven. 420 refuted. 0 times theorem prover too weak. 764 trivial. 0 not checked. [2020-07-20 22:29:27,238 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:29:28,400 INFO L134 CoverageAnalysis]: Checked inductivity of 2184 backedges. 922 proven. 420 refuted. 0 times theorem prover too weak. 842 trivial. 0 not checked. [2020-07-20 22:29:28,401 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [28503996] [2020-07-20 22:29:28,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:29:28,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44] total 65 [2020-07-20 22:29:28,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148836894] [2020-07-20 22:29:28,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2020-07-20 22:29:28,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:29:28,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2020-07-20 22:29:28,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=988, Invalid=3172, Unknown=0, NotChecked=0, Total=4160 [2020-07-20 22:29:28,403 INFO L87 Difference]: Start difference. First operand 188 states and 201 transitions. Second operand 65 states. [2020-07-20 22:29:30,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:29:30,016 INFO L93 Difference]: Finished difference Result 371 states and 447 transitions. [2020-07-20 22:29:30,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-20 22:29:30,016 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 225 [2020-07-20 22:29:30,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:29:30,018 INFO L225 Difference]: With dead ends: 371 [2020-07-20 22:29:30,018 INFO L226 Difference]: Without dead ends: 274 [2020-07-20 22:29:30,020 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 365 SyntacticMatches, 21 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1870 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1933, Invalid=5377, Unknown=0, NotChecked=0, Total=7310 [2020-07-20 22:29:30,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-07-20 22:29:30,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 190. [2020-07-20 22:29:30,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-20 22:29:30,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 203 transitions. [2020-07-20 22:29:30,031 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 203 transitions. Word has length 225 [2020-07-20 22:29:30,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:29:30,032 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 203 transitions. [2020-07-20 22:29:30,032 INFO L480 AbstractCegarLoop]: Interpolant automaton has 65 states. [2020-07-20 22:29:30,032 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 203 transitions. [2020-07-20 22:29:30,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2020-07-20 22:29:30,034 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:29:30,034 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:30,247 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:30,248 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:30,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:30,249 INFO L82 PathProgramCache]: Analyzing trace with hash 1137618157, now seen corresponding path program 31 times [2020-07-20 22:29:30,249 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:30,249 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [692150751] [2020-07-20 22:29:30,249 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 22:29:30,347 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:30,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:30,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 554 conjuncts, 46 conjunts are in the unsatisfiable core [2020-07-20 22:29:30,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:29:31,457 INFO L134 CoverageAnalysis]: Checked inductivity of 2226 backedges. 924 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-20 22:29:31,458 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:29:32,761 INFO L134 CoverageAnalysis]: Checked inductivity of 2226 backedges. 924 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-20 22:29:32,761 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [692150751] [2020-07-20 22:29:32,761 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:29:32,762 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46] total 68 [2020-07-20 22:29:32,762 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [147198340] [2020-07-20 22:29:32,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-20 22:29:32,762 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:29:32,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-20 22:29:32,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1079, Invalid=3477, Unknown=0, NotChecked=0, Total=4556 [2020-07-20 22:29:32,763 INFO L87 Difference]: Start difference. First operand 190 states and 203 transitions. Second operand 68 states. [2020-07-20 22:29:34,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:29:34,359 INFO L93 Difference]: Finished difference Result 375 states and 454 transitions. [2020-07-20 22:29:34,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-20 22:29:34,359 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 227 [2020-07-20 22:29:34,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:29:34,361 INFO L225 Difference]: With dead ends: 375 [2020-07-20 22:29:34,361 INFO L226 Difference]: Without dead ends: 280 [2020-07-20 22:29:34,362 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 365 SyntacticMatches, 22 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2058 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2113, Invalid=5897, Unknown=0, NotChecked=0, Total=8010 [2020-07-20 22:29:34,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2020-07-20 22:29:34,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 192. [2020-07-20 22:29:34,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2020-07-20 22:29:34,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 205 transitions. [2020-07-20 22:29:34,372 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 205 transitions. Word has length 227 [2020-07-20 22:29:34,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:29:34,372 INFO L479 AbstractCegarLoop]: Abstraction has 192 states and 205 transitions. [2020-07-20 22:29:34,372 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-20 22:29:34,372 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 205 transitions. [2020-07-20 22:29:34,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2020-07-20 22:29:34,374 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:29:34,374 INFO L422 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:34,587 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:34,588 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:34,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:34,589 INFO L82 PathProgramCache]: Analyzing trace with hash 1057457490, now seen corresponding path program 32 times [2020-07-20 22:29:34,589 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:34,589 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1357055726] [2020-07-20 22:29:34,590 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 22:29:34,691 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:34,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:34,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 565 conjuncts, 47 conjunts are in the unsatisfiable core [2020-07-20 22:29:34,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:29:35,073 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:29:35,135 INFO L134 CoverageAnalysis]: Checked inductivity of 2270 backedges. 548 proven. 882 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-20 22:29:35,135 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:29:35,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:29:35,940 INFO L134 CoverageAnalysis]: Checked inductivity of 2270 backedges. 548 proven. 882 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-20 22:29:35,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1357055726] [2020-07-20 22:29:35,941 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:29:35,941 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 28 [2020-07-20 22:29:35,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [419435894] [2020-07-20 22:29:35,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-20 22:29:35,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:29:35,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-20 22:29:35,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=427, Unknown=0, NotChecked=0, Total=756 [2020-07-20 22:29:35,943 INFO L87 Difference]: Start difference. First operand 192 states and 205 transitions. Second operand 28 states. [2020-07-20 22:29:36,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:29:36,247 INFO L93 Difference]: Finished difference Result 211 states and 226 transitions. [2020-07-20 22:29:36,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-20 22:29:36,248 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 229 [2020-07-20 22:29:36,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:29:36,250 INFO L225 Difference]: With dead ends: 211 [2020-07-20 22:29:36,250 INFO L226 Difference]: Without dead ends: 209 [2020-07-20 22:29:36,250 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 387 SyntacticMatches, 44 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 637 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=333, Invalid=479, Unknown=0, NotChecked=0, Total=812 [2020-07-20 22:29:36,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-07-20 22:29:36,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 204. [2020-07-20 22:29:36,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-07-20 22:29:36,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 218 transitions. [2020-07-20 22:29:36,261 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 218 transitions. Word has length 229 [2020-07-20 22:29:36,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:29:36,262 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 218 transitions. [2020-07-20 22:29:36,262 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-20 22:29:36,262 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 218 transitions. [2020-07-20 22:29:36,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2020-07-20 22:29:36,264 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:29:36,264 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 23, 23, 23, 23, 23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:36,477 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:36,478 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:36,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:36,479 INFO L82 PathProgramCache]: Analyzing trace with hash -777665740, now seen corresponding path program 33 times [2020-07-20 22:29:36,479 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:36,479 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [871674862] [2020-07-20 22:29:36,479 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 22:29:36,582 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:36,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:36,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 595 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-20 22:29:36,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:29:37,799 INFO L134 CoverageAnalysis]: Checked inductivity of 2622 backedges. 1188 proven. 506 refuted. 0 times theorem prover too weak. 928 trivial. 0 not checked. [2020-07-20 22:29:37,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:29:39,237 INFO L134 CoverageAnalysis]: Checked inductivity of 2622 backedges. 1102 proven. 506 refuted. 0 times theorem prover too weak. 1014 trivial. 0 not checked. [2020-07-20 22:29:39,237 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [871674862] [2020-07-20 22:29:39,237 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:29:39,238 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48] total 71 [2020-07-20 22:29:39,238 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264594820] [2020-07-20 22:29:39,238 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2020-07-20 22:29:39,238 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:29:39,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2020-07-20 22:29:39,239 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1174, Invalid=3796, Unknown=0, NotChecked=0, Total=4970 [2020-07-20 22:29:39,240 INFO L87 Difference]: Start difference. First operand 204 states and 218 transitions. Second operand 71 states. [2020-07-20 22:29:41,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:29:41,110 INFO L93 Difference]: Finished difference Result 403 states and 486 transitions. [2020-07-20 22:29:41,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-20 22:29:41,111 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 245 [2020-07-20 22:29:41,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:29:41,112 INFO L225 Difference]: With dead ends: 403 [2020-07-20 22:29:41,113 INFO L226 Difference]: Without dead ends: 298 [2020-07-20 22:29:41,115 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 397 SyntacticMatches, 23 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2255 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=2301, Invalid=6441, Unknown=0, NotChecked=0, Total=8742 [2020-07-20 22:29:41,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2020-07-20 22:29:41,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 206. [2020-07-20 22:29:41,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2020-07-20 22:29:41,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 220 transitions. [2020-07-20 22:29:41,127 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 220 transitions. Word has length 245 [2020-07-20 22:29:41,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:29:41,127 INFO L479 AbstractCegarLoop]: Abstraction has 206 states and 220 transitions. [2020-07-20 22:29:41,127 INFO L480 AbstractCegarLoop]: Interpolant automaton has 71 states. [2020-07-20 22:29:41,127 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 220 transitions. [2020-07-20 22:29:41,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2020-07-20 22:29:41,129 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:29:41,129 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 23, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:41,342 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:41,343 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:41,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:41,343 INFO L82 PathProgramCache]: Analyzing trace with hash 1435577433, now seen corresponding path program 34 times [2020-07-20 22:29:41,343 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:41,344 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [328694042] [2020-07-20 22:29:41,344 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 22:29:41,450 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:41,451 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:41,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 603 conjuncts, 50 conjunts are in the unsatisfiable core [2020-07-20 22:29:41,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:29:42,780 INFO L134 CoverageAnalysis]: Checked inductivity of 2668 backedges. 1104 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-20 22:29:42,781 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:29:44,359 INFO L134 CoverageAnalysis]: Checked inductivity of 2668 backedges. 1104 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-20 22:29:44,360 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [328694042] [2020-07-20 22:29:44,360 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:29:44,360 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50] total 74 [2020-07-20 22:29:44,360 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1941704534] [2020-07-20 22:29:44,361 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2020-07-20 22:29:44,361 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:29:44,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2020-07-20 22:29:44,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1273, Invalid=4129, Unknown=0, NotChecked=0, Total=5402 [2020-07-20 22:29:44,363 INFO L87 Difference]: Start difference. First operand 206 states and 220 transitions. Second operand 74 states. [2020-07-20 22:29:46,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:29:46,454 INFO L93 Difference]: Finished difference Result 407 states and 493 transitions. [2020-07-20 22:29:46,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-20 22:29:46,455 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 247 [2020-07-20 22:29:46,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:29:46,456 INFO L225 Difference]: With dead ends: 407 [2020-07-20 22:29:46,456 INFO L226 Difference]: Without dead ends: 304 [2020-07-20 22:29:46,458 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 397 SyntacticMatches, 24 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2461 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=2497, Invalid=7009, Unknown=0, NotChecked=0, Total=9506 [2020-07-20 22:29:46,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2020-07-20 22:29:46,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 208. [2020-07-20 22:29:46,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2020-07-20 22:29:46,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 222 transitions. [2020-07-20 22:29:46,471 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 222 transitions. Word has length 247 [2020-07-20 22:29:46,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:29:46,471 INFO L479 AbstractCegarLoop]: Abstraction has 208 states and 222 transitions. [2020-07-20 22:29:46,471 INFO L480 AbstractCegarLoop]: Interpolant automaton has 74 states. [2020-07-20 22:29:46,471 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 222 transitions. [2020-07-20 22:29:46,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2020-07-20 22:29:46,473 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:29:46,473 INFO L422 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:46,685 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:46,686 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:46,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:46,687 INFO L82 PathProgramCache]: Analyzing trace with hash -1941512130, now seen corresponding path program 35 times [2020-07-20 22:29:46,687 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:46,687 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1035347938] [2020-07-20 22:29:46,688 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 22:29:46,797 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:46,797 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:46,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 614 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-20 22:29:46,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:29:47,255 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:29:47,325 INFO L134 CoverageAnalysis]: Checked inductivity of 2716 backedges. 646 proven. 1058 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-20 22:29:47,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:29:47,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:29:48,260 INFO L134 CoverageAnalysis]: Checked inductivity of 2716 backedges. 646 proven. 1058 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-20 22:29:48,260 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1035347938] [2020-07-20 22:29:48,261 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:29:48,261 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 30 [2020-07-20 22:29:48,261 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1742438171] [2020-07-20 22:29:48,262 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-20 22:29:48,262 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:29:48,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-20 22:29:48,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=488, Unknown=0, NotChecked=0, Total=870 [2020-07-20 22:29:48,263 INFO L87 Difference]: Start difference. First operand 208 states and 222 transitions. Second operand 30 states. [2020-07-20 22:29:48,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:29:48,627 INFO L93 Difference]: Finished difference Result 227 states and 243 transitions. [2020-07-20 22:29:48,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-20 22:29:48,628 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 249 [2020-07-20 22:29:48,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:29:48,630 INFO L225 Difference]: With dead ends: 227 [2020-07-20 22:29:48,630 INFO L226 Difference]: Without dead ends: 225 [2020-07-20 22:29:48,631 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 421 SyntacticMatches, 48 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 743 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=386, Invalid=544, Unknown=0, NotChecked=0, Total=930 [2020-07-20 22:29:48,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2020-07-20 22:29:48,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 220. [2020-07-20 22:29:48,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2020-07-20 22:29:48,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 235 transitions. [2020-07-20 22:29:48,643 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 235 transitions. Word has length 249 [2020-07-20 22:29:48,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:29:48,643 INFO L479 AbstractCegarLoop]: Abstraction has 220 states and 235 transitions. [2020-07-20 22:29:48,644 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-20 22:29:48,644 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 235 transitions. [2020-07-20 22:29:48,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2020-07-20 22:29:48,646 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:29:48,646 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 26, 25, 25, 25, 25, 25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:48,859 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:48,860 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:48,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:48,860 INFO L82 PathProgramCache]: Analyzing trace with hash -712391136, now seen corresponding path program 36 times [2020-07-20 22:29:48,860 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:48,860 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1812596676] [2020-07-20 22:29:48,861 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 22:29:48,985 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:48,986 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:48,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 644 conjuncts, 52 conjunts are in the unsatisfiable core [2020-07-20 22:29:48,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:29:50,454 INFO L134 CoverageAnalysis]: Checked inductivity of 3100 backedges. 1392 proven. 600 refuted. 0 times theorem prover too weak. 1108 trivial. 0 not checked. [2020-07-20 22:29:50,454 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:29:52,211 INFO L134 CoverageAnalysis]: Checked inductivity of 3100 backedges. 1298 proven. 600 refuted. 0 times theorem prover too weak. 1202 trivial. 0 not checked. [2020-07-20 22:29:52,212 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1812596676] [2020-07-20 22:29:52,212 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:29:52,212 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52] total 77 [2020-07-20 22:29:52,212 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687606827] [2020-07-20 22:29:52,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2020-07-20 22:29:52,213 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:29:52,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2020-07-20 22:29:52,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1376, Invalid=4476, Unknown=0, NotChecked=0, Total=5852 [2020-07-20 22:29:52,214 INFO L87 Difference]: Start difference. First operand 220 states and 235 transitions. Second operand 77 states. [2020-07-20 22:29:54,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:29:54,329 INFO L93 Difference]: Finished difference Result 435 states and 525 transitions. [2020-07-20 22:29:54,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-20 22:29:54,330 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 265 [2020-07-20 22:29:54,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:29:54,332 INFO L225 Difference]: With dead ends: 435 [2020-07-20 22:29:54,332 INFO L226 Difference]: Without dead ends: 322 [2020-07-20 22:29:54,334 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 554 GetRequests, 429 SyntacticMatches, 25 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2676 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=2701, Invalid=7601, Unknown=0, NotChecked=0, Total=10302 [2020-07-20 22:29:54,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2020-07-20 22:29:54,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 222. [2020-07-20 22:29:54,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2020-07-20 22:29:54,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 237 transitions. [2020-07-20 22:29:54,348 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 237 transitions. Word has length 265 [2020-07-20 22:29:54,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:29:54,349 INFO L479 AbstractCegarLoop]: Abstraction has 222 states and 237 transitions. [2020-07-20 22:29:54,349 INFO L480 AbstractCegarLoop]: Interpolant automaton has 77 states. [2020-07-20 22:29:54,349 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 237 transitions. [2020-07-20 22:29:54,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 268 [2020-07-20 22:29:54,351 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:29:54,351 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 25, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:29:54,564 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:29:54,565 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:29:54,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:29:54,566 INFO L82 PathProgramCache]: Analyzing trace with hash -993908027, now seen corresponding path program 37 times [2020-07-20 22:29:54,566 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:29:54,566 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1915643075] [2020-07-20 22:29:54,567 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 22:29:54,682 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:29:54,682 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:29:54,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 652 conjuncts, 54 conjunts are in the unsatisfiable core [2020-07-20 22:29:54,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:29:56,383 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 1300 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-20 22:29:56,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:29:58,304 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 1300 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-20 22:29:58,305 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1915643075] [2020-07-20 22:29:58,305 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:29:58,305 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54] total 80 [2020-07-20 22:29:58,305 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1408472690] [2020-07-20 22:29:58,306 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2020-07-20 22:29:58,306 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:29:58,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2020-07-20 22:29:58,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1483, Invalid=4837, Unknown=0, NotChecked=0, Total=6320 [2020-07-20 22:29:58,307 INFO L87 Difference]: Start difference. First operand 222 states and 237 transitions. Second operand 80 states. [2020-07-20 22:30:00,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:30:00,571 INFO L93 Difference]: Finished difference Result 439 states and 532 transitions. [2020-07-20 22:30:00,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-20 22:30:00,572 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 267 [2020-07-20 22:30:00,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:30:00,574 INFO L225 Difference]: With dead ends: 439 [2020-07-20 22:30:00,575 INFO L226 Difference]: Without dead ends: 328 [2020-07-20 22:30:00,576 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 559 GetRequests, 429 SyntacticMatches, 26 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2900 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=2913, Invalid=8217, Unknown=0, NotChecked=0, Total=11130 [2020-07-20 22:30:00,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2020-07-20 22:30:00,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 224. [2020-07-20 22:30:00,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2020-07-20 22:30:00,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 239 transitions. [2020-07-20 22:30:00,589 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 239 transitions. Word has length 267 [2020-07-20 22:30:00,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:30:00,590 INFO L479 AbstractCegarLoop]: Abstraction has 224 states and 239 transitions. [2020-07-20 22:30:00,590 INFO L480 AbstractCegarLoop]: Interpolant automaton has 80 states. [2020-07-20 22:30:00,590 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 239 transitions. [2020-07-20 22:30:00,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2020-07-20 22:30:00,592 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:30:00,592 INFO L422 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:30:00,805 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:30:00,806 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:30:00,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:30:00,807 INFO L82 PathProgramCache]: Analyzing trace with hash -948700630, now seen corresponding path program 38 times [2020-07-20 22:30:00,807 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:30:00,807 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [871826330] [2020-07-20 22:30:00,807 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 22:30:00,914 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:30:00,914 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:30:00,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 55 conjunts are in the unsatisfiable core [2020-07-20 22:30:00,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:30:01,529 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:30:01,630 INFO L134 CoverageAnalysis]: Checked inductivity of 3202 backedges. 752 proven. 1250 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-20 22:30:01,631 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:30:01,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:30:02,779 INFO L134 CoverageAnalysis]: Checked inductivity of 3202 backedges. 752 proven. 1250 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-20 22:30:02,780 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [871826330] [2020-07-20 22:30:02,780 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:30:02,780 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 32 [2020-07-20 22:30:02,780 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [319698850] [2020-07-20 22:30:02,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-20 22:30:02,781 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:30:02,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-20 22:30:02,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=439, Invalid=553, Unknown=0, NotChecked=0, Total=992 [2020-07-20 22:30:02,782 INFO L87 Difference]: Start difference. First operand 224 states and 239 transitions. Second operand 32 states. [2020-07-20 22:30:03,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:30:03,200 INFO L93 Difference]: Finished difference Result 243 states and 260 transitions. [2020-07-20 22:30:03,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-20 22:30:03,208 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 269 [2020-07-20 22:30:03,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:30:03,210 INFO L225 Difference]: With dead ends: 243 [2020-07-20 22:30:03,210 INFO L226 Difference]: Without dead ends: 241 [2020-07-20 22:30:03,210 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 538 GetRequests, 455 SyntacticMatches, 52 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 857 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=443, Invalid=613, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 22:30:03,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2020-07-20 22:30:03,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 236. [2020-07-20 22:30:03,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 236 states. [2020-07-20 22:30:03,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 252 transitions. [2020-07-20 22:30:03,221 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 252 transitions. Word has length 269 [2020-07-20 22:30:03,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:30:03,223 INFO L479 AbstractCegarLoop]: Abstraction has 236 states and 252 transitions. [2020-07-20 22:30:03,223 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-20 22:30:03,223 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 252 transitions. [2020-07-20 22:30:03,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2020-07-20 22:30:03,225 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:30:03,225 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 27, 27, 27, 27, 27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:30:03,438 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:30:03,439 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:30:03,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:30:03,439 INFO L82 PathProgramCache]: Analyzing trace with hash 167610380, now seen corresponding path program 39 times [2020-07-20 22:30:03,440 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:30:03,440 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [281769518] [2020-07-20 22:30:03,440 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 22:30:03,559 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:30:03,560 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:30:03,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 693 conjuncts, 56 conjunts are in the unsatisfiable core [2020-07-20 22:30:03,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:30:05,503 INFO L134 CoverageAnalysis]: Checked inductivity of 3618 backedges. 1612 proven. 702 refuted. 0 times theorem prover too weak. 1304 trivial. 0 not checked. [2020-07-20 22:30:05,504 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:30:07,807 INFO L134 CoverageAnalysis]: Checked inductivity of 3618 backedges. 1510 proven. 702 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2020-07-20 22:30:07,808 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [281769518] [2020-07-20 22:30:07,808 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:30:07,808 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56] total 83 [2020-07-20 22:30:07,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248373199] [2020-07-20 22:30:07,809 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2020-07-20 22:30:07,809 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:30:07,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2020-07-20 22:30:07,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1594, Invalid=5212, Unknown=0, NotChecked=0, Total=6806 [2020-07-20 22:30:07,810 INFO L87 Difference]: Start difference. First operand 236 states and 252 transitions. Second operand 83 states. [2020-07-20 22:30:10,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:30:10,034 INFO L93 Difference]: Finished difference Result 467 states and 564 transitions. [2020-07-20 22:30:10,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-07-20 22:30:10,034 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 285 [2020-07-20 22:30:10,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:30:10,036 INFO L225 Difference]: With dead ends: 467 [2020-07-20 22:30:10,037 INFO L226 Difference]: Without dead ends: 346 [2020-07-20 22:30:10,038 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 596 GetRequests, 461 SyntacticMatches, 27 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3133 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=3133, Invalid=8857, Unknown=0, NotChecked=0, Total=11990 [2020-07-20 22:30:10,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2020-07-20 22:30:10,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 238. [2020-07-20 22:30:10,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2020-07-20 22:30:10,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 254 transitions. [2020-07-20 22:30:10,050 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 254 transitions. Word has length 285 [2020-07-20 22:30:10,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:30:10,050 INFO L479 AbstractCegarLoop]: Abstraction has 238 states and 254 transitions. [2020-07-20 22:30:10,050 INFO L480 AbstractCegarLoop]: Interpolant automaton has 83 states. [2020-07-20 22:30:10,050 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 254 transitions. [2020-07-20 22:30:10,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2020-07-20 22:30:10,052 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:30:10,052 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 27, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:30:10,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:30:10,267 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:30:10,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:30:10,267 INFO L82 PathProgramCache]: Analyzing trace with hash 196225073, now seen corresponding path program 40 times [2020-07-20 22:30:10,267 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:30:10,268 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [350349513] [2020-07-20 22:30:10,268 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 22:30:10,400 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:30:10,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:30:10,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 701 conjuncts, 58 conjunts are in the unsatisfiable core [2020-07-20 22:30:10,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:30:12,157 INFO L134 CoverageAnalysis]: Checked inductivity of 3672 backedges. 1512 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-20 22:30:12,158 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:30:14,257 INFO L134 CoverageAnalysis]: Checked inductivity of 3672 backedges. 1512 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-20 22:30:14,258 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [350349513] [2020-07-20 22:30:14,258 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:30:14,258 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58] total 86 [2020-07-20 22:30:14,259 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [323373537] [2020-07-20 22:30:14,259 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2020-07-20 22:30:14,259 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:30:14,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2020-07-20 22:30:14,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1709, Invalid=5601, Unknown=0, NotChecked=0, Total=7310 [2020-07-20 22:30:14,261 INFO L87 Difference]: Start difference. First operand 238 states and 254 transitions. Second operand 86 states. [2020-07-20 22:30:16,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:30:16,540 INFO L93 Difference]: Finished difference Result 471 states and 571 transitions. [2020-07-20 22:30:16,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-07-20 22:30:16,540 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 287 [2020-07-20 22:30:16,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:30:16,542 INFO L225 Difference]: With dead ends: 471 [2020-07-20 22:30:16,542 INFO L226 Difference]: Without dead ends: 352 [2020-07-20 22:30:16,544 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 461 SyntacticMatches, 28 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3375 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3361, Invalid=9521, Unknown=0, NotChecked=0, Total=12882 [2020-07-20 22:30:16,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2020-07-20 22:30:16,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 240. [2020-07-20 22:30:16,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2020-07-20 22:30:16,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 256 transitions. [2020-07-20 22:30:16,555 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 256 transitions. Word has length 287 [2020-07-20 22:30:16,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:30:16,556 INFO L479 AbstractCegarLoop]: Abstraction has 240 states and 256 transitions. [2020-07-20 22:30:16,556 INFO L480 AbstractCegarLoop]: Interpolant automaton has 86 states. [2020-07-20 22:30:16,556 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 256 transitions. [2020-07-20 22:30:16,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 290 [2020-07-20 22:30:16,558 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:30:16,558 INFO L422 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:30:16,772 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:30:16,773 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:30:16,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:30:16,773 INFO L82 PathProgramCache]: Analyzing trace with hash 1925141270, now seen corresponding path program 41 times [2020-07-20 22:30:16,774 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:30:16,774 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1301396415] [2020-07-20 22:30:16,774 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 22:30:16,891 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:30:16,892 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:30:16,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 712 conjuncts, 59 conjunts are in the unsatisfiable core [2020-07-20 22:30:16,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:30:17,542 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:30:17,625 INFO L134 CoverageAnalysis]: Checked inductivity of 3728 backedges. 866 proven. 1458 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-20 22:30:17,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:30:17,669 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:30:18,908 INFO L134 CoverageAnalysis]: Checked inductivity of 3728 backedges. 866 proven. 1458 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-20 22:30:18,909 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1301396415] [2020-07-20 22:30:18,909 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:30:18,909 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 34 [2020-07-20 22:30:18,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [887891656] [2020-07-20 22:30:18,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-20 22:30:18,910 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:30:18,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-20 22:30:18,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=500, Invalid=622, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 22:30:18,911 INFO L87 Difference]: Start difference. First operand 240 states and 256 transitions. Second operand 34 states. [2020-07-20 22:30:19,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:30:19,447 INFO L93 Difference]: Finished difference Result 259 states and 277 transitions. [2020-07-20 22:30:19,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 22:30:19,448 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 289 [2020-07-20 22:30:19,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:30:19,450 INFO L225 Difference]: With dead ends: 259 [2020-07-20 22:30:19,450 INFO L226 Difference]: Without dead ends: 257 [2020-07-20 22:30:19,450 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 489 SyntacticMatches, 56 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 979 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=504, Invalid=686, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 22:30:19,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2020-07-20 22:30:19,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 252. [2020-07-20 22:30:19,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 252 states. [2020-07-20 22:30:19,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 269 transitions. [2020-07-20 22:30:19,465 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 269 transitions. Word has length 289 [2020-07-20 22:30:19,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:30:19,467 INFO L479 AbstractCegarLoop]: Abstraction has 252 states and 269 transitions. [2020-07-20 22:30:19,467 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-20 22:30:19,467 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 269 transitions. [2020-07-20 22:30:19,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2020-07-20 22:30:19,469 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:30:19,469 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 29, 29, 29, 29, 29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:30:19,684 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:30:19,685 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:30:19,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:30:19,685 INFO L82 PathProgramCache]: Analyzing trace with hash -2144237320, now seen corresponding path program 42 times [2020-07-20 22:30:19,686 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:30:19,686 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1548789361] [2020-07-20 22:30:19,686 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 22:30:19,807 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:30:19,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:30:19,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 742 conjuncts, 60 conjunts are in the unsatisfiable core [2020-07-20 22:30:19,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:30:21,726 INFO L134 CoverageAnalysis]: Checked inductivity of 4176 backedges. 1848 proven. 812 refuted. 0 times theorem prover too weak. 1516 trivial. 0 not checked. [2020-07-20 22:30:21,726 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:30:24,005 INFO L134 CoverageAnalysis]: Checked inductivity of 4176 backedges. 1738 proven. 812 refuted. 0 times theorem prover too weak. 1626 trivial. 0 not checked. [2020-07-20 22:30:24,005 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1548789361] [2020-07-20 22:30:24,005 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:30:24,006 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60] total 89 [2020-07-20 22:30:24,006 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645483350] [2020-07-20 22:30:24,006 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2020-07-20 22:30:24,007 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:30:24,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2020-07-20 22:30:24,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1828, Invalid=6004, Unknown=0, NotChecked=0, Total=7832 [2020-07-20 22:30:24,008 INFO L87 Difference]: Start difference. First operand 252 states and 269 transitions. Second operand 89 states. [2020-07-20 22:30:26,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:30:26,448 INFO L93 Difference]: Finished difference Result 499 states and 603 transitions. [2020-07-20 22:30:26,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-07-20 22:30:26,448 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 305 [2020-07-20 22:30:26,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:30:26,450 INFO L225 Difference]: With dead ends: 499 [2020-07-20 22:30:26,450 INFO L226 Difference]: Without dead ends: 370 [2020-07-20 22:30:26,452 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 638 GetRequests, 493 SyntacticMatches, 29 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3626 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=3597, Invalid=10209, Unknown=0, NotChecked=0, Total=13806 [2020-07-20 22:30:26,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2020-07-20 22:30:26,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 254. [2020-07-20 22:30:26,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2020-07-20 22:30:26,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 271 transitions. [2020-07-20 22:30:26,464 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 271 transitions. Word has length 305 [2020-07-20 22:30:26,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:30:26,465 INFO L479 AbstractCegarLoop]: Abstraction has 254 states and 271 transitions. [2020-07-20 22:30:26,465 INFO L480 AbstractCegarLoop]: Interpolant automaton has 89 states. [2020-07-20 22:30:26,465 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 271 transitions. [2020-07-20 22:30:26,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 308 [2020-07-20 22:30:26,467 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:30:26,467 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 29, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:30:26,680 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:30:26,681 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:30:26,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:30:26,682 INFO L82 PathProgramCache]: Analyzing trace with hash 191997085, now seen corresponding path program 43 times [2020-07-20 22:30:26,682 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:30:26,683 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1732109977] [2020-07-20 22:30:26,683 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 22:30:26,801 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:30:26,801 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:30:26,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 750 conjuncts, 62 conjunts are in the unsatisfiable core [2020-07-20 22:30:26,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:30:28,798 INFO L134 CoverageAnalysis]: Checked inductivity of 4234 backedges. 1740 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-20 22:30:28,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:30:31,196 INFO L134 CoverageAnalysis]: Checked inductivity of 4234 backedges. 1740 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-20 22:30:31,196 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1732109977] [2020-07-20 22:30:31,196 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:30:31,197 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62] total 92 [2020-07-20 22:30:31,197 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962177048] [2020-07-20 22:30:31,197 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2020-07-20 22:30:31,197 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:30:31,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2020-07-20 22:30:31,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1951, Invalid=6421, Unknown=0, NotChecked=0, Total=8372 [2020-07-20 22:30:31,198 INFO L87 Difference]: Start difference. First operand 254 states and 271 transitions. Second operand 92 states. [2020-07-20 22:30:33,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:30:33,740 INFO L93 Difference]: Finished difference Result 503 states and 610 transitions. [2020-07-20 22:30:33,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2020-07-20 22:30:33,741 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 307 [2020-07-20 22:30:33,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:30:33,743 INFO L225 Difference]: With dead ends: 503 [2020-07-20 22:30:33,743 INFO L226 Difference]: Without dead ends: 376 [2020-07-20 22:30:33,744 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 643 GetRequests, 493 SyntacticMatches, 30 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3886 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=3841, Invalid=10921, Unknown=0, NotChecked=0, Total=14762 [2020-07-20 22:30:33,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2020-07-20 22:30:33,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 256. [2020-07-20 22:30:33,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2020-07-20 22:30:33,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 273 transitions. [2020-07-20 22:30:33,756 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 273 transitions. Word has length 307 [2020-07-20 22:30:33,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:30:33,757 INFO L479 AbstractCegarLoop]: Abstraction has 256 states and 273 transitions. [2020-07-20 22:30:33,757 INFO L480 AbstractCegarLoop]: Interpolant automaton has 92 states. [2020-07-20 22:30:33,757 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 273 transitions. [2020-07-20 22:30:33,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2020-07-20 22:30:33,759 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:30:33,759 INFO L422 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:30:33,973 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:30:33,974 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:30:33,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:30:33,974 INFO L82 PathProgramCache]: Analyzing trace with hash -954635518, now seen corresponding path program 44 times [2020-07-20 22:30:33,974 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:30:33,974 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1468869102] [2020-07-20 22:30:33,974 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 22:30:34,089 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:30:34,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:30:34,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 761 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-20 22:30:34,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:30:34,747 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:30:34,841 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 988 proven. 1682 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-20 22:30:34,841 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:30:34,884 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:30:36,229 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 988 proven. 1682 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-20 22:30:36,229 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1468869102] [2020-07-20 22:30:36,229 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:30:36,229 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 36 [2020-07-20 22:30:36,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526468692] [2020-07-20 22:30:36,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-20 22:30:36,230 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:30:36,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-20 22:30:36,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=565, Invalid=695, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 22:30:36,231 INFO L87 Difference]: Start difference. First operand 256 states and 273 transitions. Second operand 36 states. [2020-07-20 22:30:36,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:30:36,634 INFO L93 Difference]: Finished difference Result 275 states and 294 transitions. [2020-07-20 22:30:36,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-20 22:30:36,635 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 309 [2020-07-20 22:30:36,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:30:36,637 INFO L225 Difference]: With dead ends: 275 [2020-07-20 22:30:36,637 INFO L226 Difference]: Without dead ends: 273 [2020-07-20 22:30:36,637 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 618 GetRequests, 523 SyntacticMatches, 60 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1109 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=569, Invalid=763, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 22:30:36,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2020-07-20 22:30:36,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 268. [2020-07-20 22:30:36,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 268 states. [2020-07-20 22:30:36,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 286 transitions. [2020-07-20 22:30:36,650 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 286 transitions. Word has length 309 [2020-07-20 22:30:36,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:30:36,651 INFO L479 AbstractCegarLoop]: Abstraction has 268 states and 286 transitions. [2020-07-20 22:30:36,651 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-20 22:30:36,651 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 286 transitions. [2020-07-20 22:30:36,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2020-07-20 22:30:36,653 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:30:36,653 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 31, 31, 31, 31, 31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:30:36,869 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:30:36,870 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:30:36,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:30:36,870 INFO L82 PathProgramCache]: Analyzing trace with hash -2146023196, now seen corresponding path program 45 times [2020-07-20 22:30:36,870 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:30:36,870 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [612300176] [2020-07-20 22:30:36,870 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 22:30:36,988 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:30:36,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:30:36,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 791 conjuncts, 64 conjunts are in the unsatisfiable core [2020-07-20 22:30:36,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:30:39,160 INFO L134 CoverageAnalysis]: Checked inductivity of 4774 backedges. 2100 proven. 930 refuted. 0 times theorem prover too weak. 1744 trivial. 0 not checked. [2020-07-20 22:30:39,160 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:30:41,695 INFO L134 CoverageAnalysis]: Checked inductivity of 4774 backedges. 1982 proven. 930 refuted. 0 times theorem prover too weak. 1862 trivial. 0 not checked. [2020-07-20 22:30:41,696 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [612300176] [2020-07-20 22:30:41,696 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:30:41,696 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64] total 95 [2020-07-20 22:30:41,696 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574890379] [2020-07-20 22:30:41,697 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2020-07-20 22:30:41,697 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:30:41,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2020-07-20 22:30:41,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2078, Invalid=6852, Unknown=0, NotChecked=0, Total=8930 [2020-07-20 22:30:41,698 INFO L87 Difference]: Start difference. First operand 268 states and 286 transitions. Second operand 95 states. [2020-07-20 22:30:45,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:30:45,534 INFO L93 Difference]: Finished difference Result 531 states and 642 transitions. [2020-07-20 22:30:45,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-20 22:30:45,535 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 325 [2020-07-20 22:30:45,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:30:45,538 INFO L225 Difference]: With dead ends: 531 [2020-07-20 22:30:45,538 INFO L226 Difference]: Without dead ends: 394 [2020-07-20 22:30:45,541 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 680 GetRequests, 525 SyntacticMatches, 31 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4155 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=4093, Invalid=11657, Unknown=0, NotChecked=0, Total=15750 [2020-07-20 22:30:45,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2020-07-20 22:30:45,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 270. [2020-07-20 22:30:45,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 270 states. [2020-07-20 22:30:45,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 288 transitions. [2020-07-20 22:30:45,564 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 288 transitions. Word has length 325 [2020-07-20 22:30:45,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:30:45,564 INFO L479 AbstractCegarLoop]: Abstraction has 270 states and 288 transitions. [2020-07-20 22:30:45,564 INFO L480 AbstractCegarLoop]: Interpolant automaton has 95 states. [2020-07-20 22:30:45,564 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 288 transitions. [2020-07-20 22:30:45,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2020-07-20 22:30:45,568 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:30:45,569 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 31, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:30:45,782 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:30:45,783 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:30:45,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:30:45,783 INFO L82 PathProgramCache]: Analyzing trace with hash 735125513, now seen corresponding path program 46 times [2020-07-20 22:30:45,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:30:45,784 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [638459022] [2020-07-20 22:30:45,784 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 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:30:45,990 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:30:45,990 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:30:45,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 799 conjuncts, 66 conjunts are in the unsatisfiable core [2020-07-20 22:30:46,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:30:49,193 INFO L134 CoverageAnalysis]: Checked inductivity of 4836 backedges. 1984 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-20 22:30:49,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:30:51,951 INFO L134 CoverageAnalysis]: Checked inductivity of 4836 backedges. 1984 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-20 22:30:51,952 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [638459022] [2020-07-20 22:30:51,952 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:30:51,952 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66] total 98 [2020-07-20 22:30:51,952 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324118125] [2020-07-20 22:30:51,953 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2020-07-20 22:30:51,953 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:30:51,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2020-07-20 22:30:51,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2209, Invalid=7297, Unknown=0, NotChecked=0, Total=9506 [2020-07-20 22:30:51,955 INFO L87 Difference]: Start difference. First operand 270 states and 288 transitions. Second operand 98 states. [2020-07-20 22:30:54,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:30:54,961 INFO L93 Difference]: Finished difference Result 535 states and 649 transitions. [2020-07-20 22:30:54,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2020-07-20 22:30:54,961 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 327 [2020-07-20 22:30:54,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:30:54,964 INFO L225 Difference]: With dead ends: 535 [2020-07-20 22:30:54,964 INFO L226 Difference]: Without dead ends: 400 [2020-07-20 22:30:54,966 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 685 GetRequests, 525 SyntacticMatches, 32 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4433 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=4353, Invalid=12417, Unknown=0, NotChecked=0, Total=16770 [2020-07-20 22:30:54,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400 states. [2020-07-20 22:30:54,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400 to 272. [2020-07-20 22:30:54,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 272 states. [2020-07-20 22:30:54,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 290 transitions. [2020-07-20 22:30:54,979 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 290 transitions. Word has length 327 [2020-07-20 22:30:54,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:30:54,979 INFO L479 AbstractCegarLoop]: Abstraction has 272 states and 290 transitions. [2020-07-20 22:30:54,979 INFO L480 AbstractCegarLoop]: Interpolant automaton has 98 states. [2020-07-20 22:30:54,979 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 290 transitions. [2020-07-20 22:30:54,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 330 [2020-07-20 22:30:54,981 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:30:54,981 INFO L422 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:30:55,195 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:30:55,196 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:30:55,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:30:55,197 INFO L82 PathProgramCache]: Analyzing trace with hash -734871058, now seen corresponding path program 47 times [2020-07-20 22:30:55,197 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:30:55,197 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [132186322] [2020-07-20 22:30:55,198 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 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:30:55,323 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:30:55,323 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:30:55,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 810 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-20 22:30:55,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:30:56,103 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:30:56,205 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1118 proven. 1922 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-20 22:30:56,205 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:30:56,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:30:57,828 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1118 proven. 1922 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-20 22:30:57,829 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [132186322] [2020-07-20 22:30:57,829 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:30:57,829 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37] total 38 [2020-07-20 22:30:57,829 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872405136] [2020-07-20 22:30:57,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-20 22:30:57,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:30:57,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-20 22:30:57,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=634, Invalid=772, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 22:30:57,830 INFO L87 Difference]: Start difference. First operand 272 states and 290 transitions. Second operand 38 states. [2020-07-20 22:30:58,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:30:58,356 INFO L93 Difference]: Finished difference Result 291 states and 311 transitions. [2020-07-20 22:30:58,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-20 22:30:58,357 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 329 [2020-07-20 22:30:58,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:30:58,359 INFO L225 Difference]: With dead ends: 291 [2020-07-20 22:30:58,359 INFO L226 Difference]: Without dead ends: 289 [2020-07-20 22:30:58,360 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 658 GetRequests, 557 SyntacticMatches, 64 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1247 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=638, Invalid=844, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 22:30:58,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2020-07-20 22:30:58,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 284. [2020-07-20 22:30:58,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 284 states. [2020-07-20 22:30:58,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 303 transitions. [2020-07-20 22:30:58,374 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 303 transitions. Word has length 329 [2020-07-20 22:30:58,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:30:58,375 INFO L479 AbstractCegarLoop]: Abstraction has 284 states and 303 transitions. [2020-07-20 22:30:58,375 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-20 22:30:58,375 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 303 transitions. [2020-07-20 22:30:58,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 346 [2020-07-20 22:30:58,377 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:30:58,378 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 34, 33, 33, 33, 33, 33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:30:58,592 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:30:58,593 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:30:58,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:30:58,593 INFO L82 PathProgramCache]: Analyzing trace with hash -1470347312, now seen corresponding path program 48 times [2020-07-20 22:30:58,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:30:58,593 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2121344331] [2020-07-20 22:30:58,593 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 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:30:58,721 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:30:58,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:30:58,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 840 conjuncts, 68 conjunts are in the unsatisfiable core [2020-07-20 22:30:58,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:31:01,325 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 2368 proven. 1056 refuted. 0 times theorem prover too weak. 1988 trivial. 0 not checked. [2020-07-20 22:31:01,326 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:31:04,391 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 2242 proven. 1056 refuted. 0 times theorem prover too weak. 2114 trivial. 0 not checked. [2020-07-20 22:31:04,391 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2121344331] [2020-07-20 22:31:04,391 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:31:04,391 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68] total 101 [2020-07-20 22:31:04,391 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087382739] [2020-07-20 22:31:04,392 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2020-07-20 22:31:04,392 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:31:04,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2020-07-20 22:31:04,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2344, Invalid=7756, Unknown=0, NotChecked=0, Total=10100 [2020-07-20 22:31:04,394 INFO L87 Difference]: Start difference. First operand 284 states and 303 transitions. Second operand 101 states. [2020-07-20 22:31:07,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:31:07,868 INFO L93 Difference]: Finished difference Result 563 states and 681 transitions. [2020-07-20 22:31:07,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2020-07-20 22:31:07,869 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 345 [2020-07-20 22:31:07,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:31:07,871 INFO L225 Difference]: With dead ends: 563 [2020-07-20 22:31:07,871 INFO L226 Difference]: Without dead ends: 418 [2020-07-20 22:31:07,872 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 722 GetRequests, 557 SyntacticMatches, 33 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4720 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=4621, Invalid=13201, Unknown=0, NotChecked=0, Total=17822 [2020-07-20 22:31:07,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2020-07-20 22:31:07,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 286. [2020-07-20 22:31:07,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 286 states. [2020-07-20 22:31:07,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 305 transitions. [2020-07-20 22:31:07,888 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 305 transitions. Word has length 345 [2020-07-20 22:31:07,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:31:07,888 INFO L479 AbstractCegarLoop]: Abstraction has 286 states and 305 transitions. [2020-07-20 22:31:07,888 INFO L480 AbstractCegarLoop]: Interpolant automaton has 101 states. [2020-07-20 22:31:07,889 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 305 transitions. [2020-07-20 22:31:07,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 348 [2020-07-20 22:31:07,891 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:31:07,891 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 33, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:31:08,099 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:31:08,100 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:31:08,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:31:08,101 INFO L82 PathProgramCache]: Analyzing trace with hash 2069961333, now seen corresponding path program 49 times [2020-07-20 22:31:08,102 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:31:08,102 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [306974810] [2020-07-20 22:31:08,103 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 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:31:08,235 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:31:08,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:31:08,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 848 conjuncts, 70 conjunts are in the unsatisfiable core [2020-07-20 22:31:08,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:31:11,048 INFO L134 CoverageAnalysis]: Checked inductivity of 5478 backedges. 2244 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-20 22:31:11,048 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:31:14,427 INFO L134 CoverageAnalysis]: Checked inductivity of 5478 backedges. 2244 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-20 22:31:14,428 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [306974810] [2020-07-20 22:31:14,428 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:31:14,428 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70] total 104 [2020-07-20 22:31:14,428 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985679927] [2020-07-20 22:31:14,429 INFO L459 AbstractCegarLoop]: Interpolant automaton has 104 states [2020-07-20 22:31:14,429 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:31:14,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2020-07-20 22:31:14,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2483, Invalid=8229, Unknown=0, NotChecked=0, Total=10712 [2020-07-20 22:31:14,430 INFO L87 Difference]: Start difference. First operand 286 states and 305 transitions. Second operand 104 states. [2020-07-20 22:31:18,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:31:18,648 INFO L93 Difference]: Finished difference Result 567 states and 688 transitions. [2020-07-20 22:31:18,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2020-07-20 22:31:18,649 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 347 [2020-07-20 22:31:18,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:31:18,651 INFO L225 Difference]: With dead ends: 567 [2020-07-20 22:31:18,652 INFO L226 Difference]: Without dead ends: 424 [2020-07-20 22:31:18,654 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 727 GetRequests, 557 SyntacticMatches, 34 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5016 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=4897, Invalid=14009, Unknown=0, NotChecked=0, Total=18906 [2020-07-20 22:31:18,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2020-07-20 22:31:18,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 288. [2020-07-20 22:31:18,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-07-20 22:31:18,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 307 transitions. [2020-07-20 22:31:18,665 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 307 transitions. Word has length 347 [2020-07-20 22:31:18,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:31:18,665 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 307 transitions. [2020-07-20 22:31:18,665 INFO L480 AbstractCegarLoop]: Interpolant automaton has 104 states. [2020-07-20 22:31:18,665 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 307 transitions. [2020-07-20 22:31:18,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 350 [2020-07-20 22:31:18,668 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:31:18,668 INFO L422 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:31:18,883 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:31:18,883 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:31:18,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:31:18,884 INFO L82 PathProgramCache]: Analyzing trace with hash -1602496550, now seen corresponding path program 50 times [2020-07-20 22:31:18,884 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:31:18,884 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1226048134] [2020-07-20 22:31:18,885 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 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:31:19,041 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:31:19,041 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:31:19,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 859 conjuncts, 71 conjunts are in the unsatisfiable core [2020-07-20 22:31:19,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:31:20,017 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:31:20,139 INFO L134 CoverageAnalysis]: Checked inductivity of 5546 backedges. 1256 proven. 2178 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-20 22:31:20,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:31:20,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:31:22,207 INFO L134 CoverageAnalysis]: Checked inductivity of 5546 backedges. 1256 proven. 2178 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-20 22:31:22,208 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1226048134] [2020-07-20 22:31:22,208 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:31:22,208 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39] total 40 [2020-07-20 22:31:22,208 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485847979] [2020-07-20 22:31:22,209 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-20 22:31:22,209 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:31:22,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-20 22:31:22,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=707, Invalid=853, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 22:31:22,209 INFO L87 Difference]: Start difference. First operand 288 states and 307 transitions. Second operand 40 states. [2020-07-20 22:31:22,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:31:22,825 INFO L93 Difference]: Finished difference Result 307 states and 328 transitions. [2020-07-20 22:31:22,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-20 22:31:22,826 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 349 [2020-07-20 22:31:22,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:31:22,829 INFO L225 Difference]: With dead ends: 307 [2020-07-20 22:31:22,829 INFO L226 Difference]: Without dead ends: 305 [2020-07-20 22:31:22,829 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 698 GetRequests, 591 SyntacticMatches, 68 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1393 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=711, Invalid=929, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 22:31:22,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2020-07-20 22:31:22,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 300. [2020-07-20 22:31:22,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 300 states. [2020-07-20 22:31:22,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 320 transitions. [2020-07-20 22:31:22,841 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 320 transitions. Word has length 349 [2020-07-20 22:31:22,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:31:22,842 INFO L479 AbstractCegarLoop]: Abstraction has 300 states and 320 transitions. [2020-07-20 22:31:22,842 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-20 22:31:22,842 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 320 transitions. [2020-07-20 22:31:22,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 366 [2020-07-20 22:31:22,845 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:31:22,845 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 35, 35, 35, 35, 35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:31:23,060 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:31:23,061 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:31:23,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:31:23,061 INFO L82 PathProgramCache]: Analyzing trace with hash 242484668, now seen corresponding path program 51 times [2020-07-20 22:31:23,061 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:31:23,061 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1586412433] [2020-07-20 22:31:23,062 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 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:31:23,198 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:31:23,198 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:31:23,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 889 conjuncts, 72 conjunts are in the unsatisfiable core [2020-07-20 22:31:23,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:31:26,539 INFO L134 CoverageAnalysis]: Checked inductivity of 6090 backedges. 2652 proven. 1190 refuted. 0 times theorem prover too weak. 2248 trivial. 0 not checked. [2020-07-20 22:31:26,539 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:31:30,642 INFO L134 CoverageAnalysis]: Checked inductivity of 6090 backedges. 2518 proven. 1190 refuted. 0 times theorem prover too weak. 2382 trivial. 0 not checked. [2020-07-20 22:31:30,643 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1586412433] [2020-07-20 22:31:30,643 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:31:30,643 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72] total 107 [2020-07-20 22:31:30,643 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932803775] [2020-07-20 22:31:30,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2020-07-20 22:31:30,644 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:31:30,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2020-07-20 22:31:30,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2626, Invalid=8716, Unknown=0, NotChecked=0, Total=11342 [2020-07-20 22:31:30,645 INFO L87 Difference]: Start difference. First operand 300 states and 320 transitions. Second operand 107 states. [2020-07-20 22:31:35,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:31:35,479 INFO L93 Difference]: Finished difference Result 595 states and 720 transitions. [2020-07-20 22:31:35,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2020-07-20 22:31:35,479 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 365 [2020-07-20 22:31:35,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:31:35,481 INFO L225 Difference]: With dead ends: 595 [2020-07-20 22:31:35,481 INFO L226 Difference]: Without dead ends: 442 [2020-07-20 22:31:35,483 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 764 GetRequests, 589 SyntacticMatches, 35 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5321 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=5181, Invalid=14841, Unknown=0, NotChecked=0, Total=20022 [2020-07-20 22:31:35,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2020-07-20 22:31:35,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 302. [2020-07-20 22:31:35,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 302 states. [2020-07-20 22:31:35,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 322 transitions. [2020-07-20 22:31:35,498 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 322 transitions. Word has length 365 [2020-07-20 22:31:35,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:31:35,498 INFO L479 AbstractCegarLoop]: Abstraction has 302 states and 322 transitions. [2020-07-20 22:31:35,498 INFO L480 AbstractCegarLoop]: Interpolant automaton has 107 states. [2020-07-20 22:31:35,498 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 322 transitions. [2020-07-20 22:31:35,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 368 [2020-07-20 22:31:35,501 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:31:35,501 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:31:35,716 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:31:35,717 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:31:35,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:31:35,718 INFO L82 PathProgramCache]: Analyzing trace with hash -814607391, now seen corresponding path program 52 times [2020-07-20 22:31:35,718 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:31:35,718 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1486090548] [2020-07-20 22:31:35,718 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 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:31:35,855 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:31:35,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:31:35,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 897 conjuncts, 74 conjunts are in the unsatisfiable core [2020-07-20 22:31:35,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:31:39,642 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 2520 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-20 22:31:39,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:31:44,215 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 2520 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-20 22:31:44,216 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1486090548] [2020-07-20 22:31:44,216 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:31:44,216 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74] total 110 [2020-07-20 22:31:44,216 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967268446] [2020-07-20 22:31:44,217 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2020-07-20 22:31:44,217 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:31:44,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2020-07-20 22:31:44,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2773, Invalid=9217, Unknown=0, NotChecked=0, Total=11990 [2020-07-20 22:31:44,218 INFO L87 Difference]: Start difference. First operand 302 states and 322 transitions. Second operand 110 states. [2020-07-20 22:31:49,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:31:49,424 INFO L93 Difference]: Finished difference Result 599 states and 727 transitions. [2020-07-20 22:31:49,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2020-07-20 22:31:49,425 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 367 [2020-07-20 22:31:49,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:31:49,427 INFO L225 Difference]: With dead ends: 599 [2020-07-20 22:31:49,427 INFO L226 Difference]: Without dead ends: 448 [2020-07-20 22:31:49,430 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 769 GetRequests, 589 SyntacticMatches, 36 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5635 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=5473, Invalid=15697, Unknown=0, NotChecked=0, Total=21170 [2020-07-20 22:31:49,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 448 states. [2020-07-20 22:31:49,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 448 to 304. [2020-07-20 22:31:49,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 304 states. [2020-07-20 22:31:49,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 324 transitions. [2020-07-20 22:31:49,447 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 324 transitions. Word has length 367 [2020-07-20 22:31:49,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:31:49,448 INFO L479 AbstractCegarLoop]: Abstraction has 304 states and 324 transitions. [2020-07-20 22:31:49,448 INFO L480 AbstractCegarLoop]: Interpolant automaton has 110 states. [2020-07-20 22:31:49,448 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 324 transitions. [2020-07-20 22:31:49,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 370 [2020-07-20 22:31:49,450 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:31:49,451 INFO L422 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 36, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:31:49,664 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:31:49,665 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:31:49,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:31:49,666 INFO L82 PathProgramCache]: Analyzing trace with hash 1227173062, now seen corresponding path program 53 times [2020-07-20 22:31:49,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:31:49,666 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [416540483] [2020-07-20 22:31:49,667 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 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:31:49,810 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:31:49,810 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:31:49,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 908 conjuncts, 75 conjunts are in the unsatisfiable core [2020-07-20 22:31:49,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:31:51,120 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:31:51,249 INFO L134 CoverageAnalysis]: Checked inductivity of 6232 backedges. 1402 proven. 2450 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-20 22:31:51,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:31:51,315 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:31:53,839 INFO L134 CoverageAnalysis]: Checked inductivity of 6232 backedges. 1402 proven. 2450 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-20 22:31:53,840 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [416540483] [2020-07-20 22:31:53,840 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:31:53,840 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41] total 42 [2020-07-20 22:31:53,840 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092546483] [2020-07-20 22:31:53,841 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-07-20 22:31:53,841 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:31:53,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-07-20 22:31:53,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=784, Invalid=938, Unknown=0, NotChecked=0, Total=1722 [2020-07-20 22:31:53,842 INFO L87 Difference]: Start difference. First operand 304 states and 324 transitions. Second operand 42 states. [2020-07-20 22:31:54,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:31:54,603 INFO L93 Difference]: Finished difference Result 323 states and 345 transitions. [2020-07-20 22:31:54,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-20 22:31:54,605 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 369 [2020-07-20 22:31:54,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:31:54,607 INFO L225 Difference]: With dead ends: 323 [2020-07-20 22:31:54,607 INFO L226 Difference]: Without dead ends: 321 [2020-07-20 22:31:54,608 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 738 GetRequests, 625 SyntacticMatches, 72 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1547 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=788, Invalid=1018, Unknown=0, NotChecked=0, Total=1806 [2020-07-20 22:31:54,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2020-07-20 22:31:54,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 316. [2020-07-20 22:31:54,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 316 states. [2020-07-20 22:31:54,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 337 transitions. [2020-07-20 22:31:54,620 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 337 transitions. Word has length 369 [2020-07-20 22:31:54,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:31:54,620 INFO L479 AbstractCegarLoop]: Abstraction has 316 states and 337 transitions. [2020-07-20 22:31:54,620 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-07-20 22:31:54,620 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 337 transitions. [2020-07-20 22:31:54,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 386 [2020-07-20 22:31:54,623 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:31:54,623 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 38, 37, 37, 37, 37, 37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:31:54,836 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:31:54,837 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:31:54,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:31:54,837 INFO L82 PathProgramCache]: Analyzing trace with hash 1586365096, now seen corresponding path program 54 times [2020-07-20 22:31:54,837 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:31:54,837 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [14963665] [2020-07-20 22:31:54,838 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 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:31:54,987 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:31:54,987 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:31:54,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 938 conjuncts, 76 conjunts are in the unsatisfiable core [2020-07-20 22:31:54,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:31:59,457 INFO L134 CoverageAnalysis]: Checked inductivity of 6808 backedges. 2952 proven. 1332 refuted. 0 times theorem prover too weak. 2524 trivial. 0 not checked. [2020-07-20 22:31:59,457 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:32:04,700 INFO L134 CoverageAnalysis]: Checked inductivity of 6808 backedges. 2810 proven. 1332 refuted. 0 times theorem prover too weak. 2666 trivial. 0 not checked. [2020-07-20 22:32:04,700 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [14963665] [2020-07-20 22:32:04,700 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:32:04,701 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76] total 113 [2020-07-20 22:32:04,701 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048174118] [2020-07-20 22:32:04,701 INFO L459 AbstractCegarLoop]: Interpolant automaton has 113 states [2020-07-20 22:32:04,702 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:32:04,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2020-07-20 22:32:04,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2924, Invalid=9732, Unknown=0, NotChecked=0, Total=12656 [2020-07-20 22:32:04,703 INFO L87 Difference]: Start difference. First operand 316 states and 337 transitions. Second operand 113 states. [2020-07-20 22:32:10,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:32:10,764 INFO L93 Difference]: Finished difference Result 627 states and 759 transitions. [2020-07-20 22:32:10,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2020-07-20 22:32:10,764 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 385 [2020-07-20 22:32:10,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:32:10,766 INFO L225 Difference]: With dead ends: 627 [2020-07-20 22:32:10,767 INFO L226 Difference]: Without dead ends: 466 [2020-07-20 22:32:10,768 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 806 GetRequests, 621 SyntacticMatches, 37 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5958 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=5773, Invalid=16577, Unknown=0, NotChecked=0, Total=22350 [2020-07-20 22:32:10,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2020-07-20 22:32:10,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 318. [2020-07-20 22:32:10,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 318 states. [2020-07-20 22:32:10,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 339 transitions. [2020-07-20 22:32:10,780 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 339 transitions. Word has length 385 [2020-07-20 22:32:10,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:32:10,780 INFO L479 AbstractCegarLoop]: Abstraction has 318 states and 339 transitions. [2020-07-20 22:32:10,780 INFO L480 AbstractCegarLoop]: Interpolant automaton has 113 states. [2020-07-20 22:32:10,780 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 339 transitions. [2020-07-20 22:32:10,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 388 [2020-07-20 22:32:10,782 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:32:10,782 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 37, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:32:10,982 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:32:10,983 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:32:10,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:32:10,988 INFO L82 PathProgramCache]: Analyzing trace with hash -468415411, now seen corresponding path program 55 times [2020-07-20 22:32:10,988 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:32:10,988 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [378619433] [2020-07-20 22:32:10,988 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 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:32:11,136 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:32:11,137 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:32:11,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 946 conjuncts, 78 conjunts are in the unsatisfiable core [2020-07-20 22:32:11,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:32:15,868 INFO L134 CoverageAnalysis]: Checked inductivity of 6882 backedges. 2812 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-20 22:32:15,868 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:32:20,652 INFO L134 CoverageAnalysis]: Checked inductivity of 6882 backedges. 2812 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-20 22:32:20,652 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [378619433] [2020-07-20 22:32:20,652 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:32:20,652 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 78] total 116 [2020-07-20 22:32:20,652 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040852433] [2020-07-20 22:32:20,653 INFO L459 AbstractCegarLoop]: Interpolant automaton has 116 states [2020-07-20 22:32:20,653 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:32:20,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2020-07-20 22:32:20,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3079, Invalid=10261, Unknown=0, NotChecked=0, Total=13340 [2020-07-20 22:32:20,654 INFO L87 Difference]: Start difference. First operand 318 states and 339 transitions. Second operand 116 states. [2020-07-20 22:32:26,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:32:26,038 INFO L93 Difference]: Finished difference Result 631 states and 766 transitions. [2020-07-20 22:32:26,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2020-07-20 22:32:26,038 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 387 [2020-07-20 22:32:26,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:32:26,041 INFO L225 Difference]: With dead ends: 631 [2020-07-20 22:32:26,041 INFO L226 Difference]: Without dead ends: 472 [2020-07-20 22:32:26,042 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 811 GetRequests, 621 SyntacticMatches, 38 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6290 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=6081, Invalid=17481, Unknown=0, NotChecked=0, Total=23562 [2020-07-20 22:32:26,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2020-07-20 22:32:26,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 320. [2020-07-20 22:32:26,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 320 states. [2020-07-20 22:32:26,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 320 states to 320 states and 341 transitions. [2020-07-20 22:32:26,055 INFO L78 Accepts]: Start accepts. Automaton has 320 states and 341 transitions. Word has length 387 [2020-07-20 22:32:26,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:32:26,056 INFO L479 AbstractCegarLoop]: Abstraction has 320 states and 341 transitions. [2020-07-20 22:32:26,056 INFO L480 AbstractCegarLoop]: Interpolant automaton has 116 states. [2020-07-20 22:32:26,056 INFO L276 IsEmpty]: Start isEmpty. Operand 320 states and 341 transitions. [2020-07-20 22:32:26,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2020-07-20 22:32:26,058 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:32:26,058 INFO L422 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 38, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:32:26,268 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:32:26,269 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:32:26,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:32:26,270 INFO L82 PathProgramCache]: Analyzing trace with hash 572473522, now seen corresponding path program 56 times [2020-07-20 22:32:26,270 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:32:26,270 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [94043253] [2020-07-20 22:32:26,270 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 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:32:26,423 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:32:26,423 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:32:26,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 957 conjuncts, 79 conjunts are in the unsatisfiable core [2020-07-20 22:32:26,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:32:27,807 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:32:27,967 INFO L134 CoverageAnalysis]: Checked inductivity of 6958 backedges. 1556 proven. 2738 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-20 22:32:27,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:32:28,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:32:30,751 INFO L134 CoverageAnalysis]: Checked inductivity of 6958 backedges. 1556 proven. 2738 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-20 22:32:30,751 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [94043253] [2020-07-20 22:32:30,751 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:32:30,752 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43] total 44 [2020-07-20 22:32:30,752 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522443214] [2020-07-20 22:32:30,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-20 22:32:30,752 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:32:30,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-20 22:32:30,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=865, Invalid=1027, Unknown=0, NotChecked=0, Total=1892 [2020-07-20 22:32:30,753 INFO L87 Difference]: Start difference. First operand 320 states and 341 transitions. Second operand 44 states. [2020-07-20 22:32:31,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:32:31,470 INFO L93 Difference]: Finished difference Result 339 states and 362 transitions. [2020-07-20 22:32:31,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-20 22:32:31,471 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 389 [2020-07-20 22:32:31,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:32:31,474 INFO L225 Difference]: With dead ends: 339 [2020-07-20 22:32:31,474 INFO L226 Difference]: Without dead ends: 337 [2020-07-20 22:32:31,475 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 778 GetRequests, 659 SyntacticMatches, 76 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1709 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=869, Invalid=1111, Unknown=0, NotChecked=0, Total=1980 [2020-07-20 22:32:31,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2020-07-20 22:32:31,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 332. [2020-07-20 22:32:31,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 332 states. [2020-07-20 22:32:31,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 354 transitions. [2020-07-20 22:32:31,487 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 354 transitions. Word has length 389 [2020-07-20 22:32:31,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:32:31,488 INFO L479 AbstractCegarLoop]: Abstraction has 332 states and 354 transitions. [2020-07-20 22:32:31,488 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-20 22:32:31,488 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 354 transitions. [2020-07-20 22:32:31,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 406 [2020-07-20 22:32:31,490 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:32:31,490 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 40, 39, 39, 39, 39, 39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:32:31,691 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:32:31,691 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:32:31,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:32:31,692 INFO L82 PathProgramCache]: Analyzing trace with hash -73744748, now seen corresponding path program 57 times [2020-07-20 22:32:31,692 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:32:31,692 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1814387123] [2020-07-20 22:32:31,693 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 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:32:31,847 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:32:31,847 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:32:31,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 987 conjuncts, 80 conjunts are in the unsatisfiable core [2020-07-20 22:32:31,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:32:36,203 INFO L134 CoverageAnalysis]: Checked inductivity of 7566 backedges. 3268 proven. 1482 refuted. 0 times theorem prover too weak. 2816 trivial. 0 not checked. [2020-07-20 22:32:36,203 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:32:41,382 INFO L134 CoverageAnalysis]: Checked inductivity of 7566 backedges. 3118 proven. 1482 refuted. 0 times theorem prover too weak. 2966 trivial. 0 not checked. [2020-07-20 22:32:41,382 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1814387123] [2020-07-20 22:32:41,382 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:32:41,383 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80] total 119 [2020-07-20 22:32:41,383 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [531554395] [2020-07-20 22:32:41,383 INFO L459 AbstractCegarLoop]: Interpolant automaton has 119 states [2020-07-20 22:32:41,383 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:32:41,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2020-07-20 22:32:41,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3238, Invalid=10804, Unknown=0, NotChecked=0, Total=14042 [2020-07-20 22:32:41,385 INFO L87 Difference]: Start difference. First operand 332 states and 354 transitions. Second operand 119 states. [2020-07-20 22:32:46,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:32:46,825 INFO L93 Difference]: Finished difference Result 659 states and 798 transitions. [2020-07-20 22:32:46,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2020-07-20 22:32:46,825 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 405 [2020-07-20 22:32:46,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:32:46,828 INFO L225 Difference]: With dead ends: 659 [2020-07-20 22:32:46,828 INFO L226 Difference]: Without dead ends: 490 [2020-07-20 22:32:46,830 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 653 SyntacticMatches, 39 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6631 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=6397, Invalid=18409, Unknown=0, NotChecked=0, Total=24806 [2020-07-20 22:32:46,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2020-07-20 22:32:46,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 334. [2020-07-20 22:32:46,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 334 states. [2020-07-20 22:32:46,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 356 transitions. [2020-07-20 22:32:46,847 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 356 transitions. Word has length 405 [2020-07-20 22:32:46,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:32:46,847 INFO L479 AbstractCegarLoop]: Abstraction has 334 states and 356 transitions. [2020-07-20 22:32:46,847 INFO L480 AbstractCegarLoop]: Interpolant automaton has 119 states. [2020-07-20 22:32:46,847 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 356 transitions. [2020-07-20 22:32:46,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 408 [2020-07-20 22:32:46,850 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:32:46,850 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 40, 40, 39, 39, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:32:47,064 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:32:47,065 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:32:47,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:32:47,065 INFO L82 PathProgramCache]: Analyzing trace with hash 2082014137, now seen corresponding path program 58 times [2020-07-20 22:32:47,066 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:32:47,066 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [75647760] [2020-07-20 22:32:47,066 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 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:32:47,217 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:32:47,217 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:32:47,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 995 conjuncts, 82 conjunts are in the unsatisfiable core [2020-07-20 22:32:47,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:32:51,810 INFO L134 CoverageAnalysis]: Checked inductivity of 7644 backedges. 3120 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-20 22:32:51,810 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:32:57,462 INFO L134 CoverageAnalysis]: Checked inductivity of 7644 backedges. 3120 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-20 22:32:57,462 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [75647760] [2020-07-20 22:32:57,462 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:32:57,462 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [82, 82] total 122 [2020-07-20 22:32:57,462 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092014605] [2020-07-20 22:32:57,463 INFO L459 AbstractCegarLoop]: Interpolant automaton has 122 states [2020-07-20 22:32:57,463 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:32:57,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2020-07-20 22:32:57,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3401, Invalid=11361, Unknown=0, NotChecked=0, Total=14762 [2020-07-20 22:32:57,464 INFO L87 Difference]: Start difference. First operand 334 states and 356 transitions. Second operand 122 states. [2020-07-20 22:33:03,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:33:03,787 INFO L93 Difference]: Finished difference Result 663 states and 805 transitions. [2020-07-20 22:33:03,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2020-07-20 22:33:03,787 INFO L78 Accepts]: Start accepts. Automaton has 122 states. Word has length 407 [2020-07-20 22:33:03,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:33:03,790 INFO L225 Difference]: With dead ends: 663 [2020-07-20 22:33:03,790 INFO L226 Difference]: Without dead ends: 496 [2020-07-20 22:33:03,792 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 853 GetRequests, 653 SyntacticMatches, 40 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6981 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=6721, Invalid=19361, Unknown=0, NotChecked=0, Total=26082 [2020-07-20 22:33:03,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496 states. [2020-07-20 22:33:03,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496 to 336. [2020-07-20 22:33:03,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 336 states. [2020-07-20 22:33:03,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 358 transitions. [2020-07-20 22:33:03,809 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 358 transitions. Word has length 407 [2020-07-20 22:33:03,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:33:03,809 INFO L479 AbstractCegarLoop]: Abstraction has 336 states and 358 transitions. [2020-07-20 22:33:03,809 INFO L480 AbstractCegarLoop]: Interpolant automaton has 122 states. [2020-07-20 22:33:03,809 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 358 transitions. [2020-07-20 22:33:03,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 410 [2020-07-20 22:33:03,812 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:33:03,812 INFO L422 BasicCegarLoop]: trace histogram [41, 40, 40, 40, 40, 39, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:33:04,026 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:33:04,027 INFO L427 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:33:04,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:33:04,027 INFO L82 PathProgramCache]: Analyzing trace with hash -702901346, now seen corresponding path program 59 times [2020-07-20 22:33:04,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:33:04,028 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1658496491] [2020-07-20 22:33:04,028 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 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:33:04,184 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:33:04,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:33:04,189 INFO L263 TraceCheckSpWp]: Trace formula consists of 1006 conjuncts, 83 conjunts are in the unsatisfiable core [2020-07-20 22:33:04,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:33:05,848 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:33:06,030 INFO L134 CoverageAnalysis]: Checked inductivity of 7724 backedges. 1718 proven. 3042 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-20 22:33:06,030 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:33:06,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:33:09,381 INFO L134 CoverageAnalysis]: Checked inductivity of 7724 backedges. 1718 proven. 3042 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-20 22:33:09,382 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1658496491] [2020-07-20 22:33:09,382 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:33:09,382 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45] total 46 [2020-07-20 22:33:09,382 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921301803] [2020-07-20 22:33:09,383 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-07-20 22:33:09,383 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:33:09,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-07-20 22:33:09,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=950, Invalid=1120, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 22:33:09,383 INFO L87 Difference]: Start difference. First operand 336 states and 358 transitions. Second operand 46 states. [2020-07-20 22:33:10,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:33:10,185 INFO L93 Difference]: Finished difference Result 355 states and 379 transitions. [2020-07-20 22:33:10,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-20 22:33:10,186 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 409 [2020-07-20 22:33:10,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:33:10,189 INFO L225 Difference]: With dead ends: 355 [2020-07-20 22:33:10,189 INFO L226 Difference]: Without dead ends: 353 [2020-07-20 22:33:10,190 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 818 GetRequests, 693 SyntacticMatches, 80 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1879 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=954, Invalid=1208, Unknown=0, NotChecked=0, Total=2162 [2020-07-20 22:33:10,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2020-07-20 22:33:10,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 348. [2020-07-20 22:33:10,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-20 22:33:10,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 371 transitions. [2020-07-20 22:33:10,207 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 371 transitions. Word has length 409 [2020-07-20 22:33:10,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:33:10,208 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 371 transitions. [2020-07-20 22:33:10,208 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-07-20 22:33:10,208 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 371 transitions. [2020-07-20 22:33:10,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 426 [2020-07-20 22:33:10,210 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:33:10,211 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 41, 41, 41, 41, 41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:33:10,421 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:33:10,421 INFO L427 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:33:10,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:33:10,422 INFO L82 PathProgramCache]: Analyzing trace with hash 524990848, now seen corresponding path program 60 times [2020-07-20 22:33:10,422 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:33:10,422 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1350859112] [2020-07-20 22:33:10,423 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 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:33:10,585 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:33:10,585 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:33:10,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 1036 conjuncts, 84 conjunts are in the unsatisfiable core [2020-07-20 22:33:10,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:33:15,559 INFO L134 CoverageAnalysis]: Checked inductivity of 8364 backedges. 3600 proven. 1640 refuted. 0 times theorem prover too weak. 3124 trivial. 0 not checked. [2020-07-20 22:33:15,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:33:21,284 INFO L134 CoverageAnalysis]: Checked inductivity of 8364 backedges. 3442 proven. 1640 refuted. 0 times theorem prover too weak. 3282 trivial. 0 not checked. [2020-07-20 22:33:21,285 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1350859112] [2020-07-20 22:33:21,285 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:33:21,285 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84] total 125 [2020-07-20 22:33:21,285 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321016529] [2020-07-20 22:33:21,286 INFO L459 AbstractCegarLoop]: Interpolant automaton has 125 states [2020-07-20 22:33:21,286 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:33:21,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2020-07-20 22:33:21,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3568, Invalid=11932, Unknown=0, NotChecked=0, Total=15500 [2020-07-20 22:33:21,287 INFO L87 Difference]: Start difference. First operand 348 states and 371 transitions. Second operand 125 states. [2020-07-20 22:33:27,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:33:27,452 INFO L93 Difference]: Finished difference Result 691 states and 837 transitions. [2020-07-20 22:33:27,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2020-07-20 22:33:27,453 INFO L78 Accepts]: Start accepts. Automaton has 125 states. Word has length 425 [2020-07-20 22:33:27,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:33:27,455 INFO L225 Difference]: With dead ends: 691 [2020-07-20 22:33:27,455 INFO L226 Difference]: Without dead ends: 514 [2020-07-20 22:33:27,457 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 890 GetRequests, 685 SyntacticMatches, 41 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7340 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=7053, Invalid=20337, Unknown=0, NotChecked=0, Total=27390 [2020-07-20 22:33:27,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2020-07-20 22:33:27,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 350. [2020-07-20 22:33:27,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 350 states. [2020-07-20 22:33:27,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 373 transitions. [2020-07-20 22:33:27,469 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 373 transitions. Word has length 425 [2020-07-20 22:33:27,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:33:27,469 INFO L479 AbstractCegarLoop]: Abstraction has 350 states and 373 transitions. [2020-07-20 22:33:27,469 INFO L480 AbstractCegarLoop]: Interpolant automaton has 125 states. [2020-07-20 22:33:27,469 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 373 transitions. [2020-07-20 22:33:27,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 428 [2020-07-20 22:33:27,471 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:33:27,471 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 42, 41, 41, 41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:33:27,671 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:33:27,672 INFO L427 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:33:27,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:33:27,672 INFO L82 PathProgramCache]: Analyzing trace with hash -2129659355, now seen corresponding path program 61 times [2020-07-20 22:33:27,673 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:33:27,673 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1769484044] [2020-07-20 22:33:27,673 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 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:33:27,837 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:33:27,837 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:33:27,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 1044 conjuncts, 86 conjunts are in the unsatisfiable core [2020-07-20 22:33:27,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:33:32,976 INFO L134 CoverageAnalysis]: Checked inductivity of 8446 backedges. 3444 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-20 22:33:32,976 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:33:39,029 INFO L134 CoverageAnalysis]: Checked inductivity of 8446 backedges. 3444 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-20 22:33:39,030 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1769484044] [2020-07-20 22:33:39,030 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:33:39,042 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [86, 86] total 128 [2020-07-20 22:33:39,042 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697809896] [2020-07-20 22:33:39,042 INFO L459 AbstractCegarLoop]: Interpolant automaton has 128 states [2020-07-20 22:33:39,043 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:33:39,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2020-07-20 22:33:39,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3739, Invalid=12517, Unknown=0, NotChecked=0, Total=16256 [2020-07-20 22:33:39,045 INFO L87 Difference]: Start difference. First operand 350 states and 373 transitions. Second operand 128 states. [2020-07-20 22:33:45,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:33:45,572 INFO L93 Difference]: Finished difference Result 695 states and 844 transitions. [2020-07-20 22:33:45,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2020-07-20 22:33:45,573 INFO L78 Accepts]: Start accepts. Automaton has 128 states. Word has length 427 [2020-07-20 22:33:45,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:33:45,575 INFO L225 Difference]: With dead ends: 695 [2020-07-20 22:33:45,575 INFO L226 Difference]: Without dead ends: 520 [2020-07-20 22:33:45,576 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 895 GetRequests, 685 SyntacticMatches, 42 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7708 ImplicationChecksByTransitivity, 13.5s TimeCoverageRelationStatistics Valid=7393, Invalid=21337, Unknown=0, NotChecked=0, Total=28730 [2020-07-20 22:33:45,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2020-07-20 22:33:45,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 352. [2020-07-20 22:33:45,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 352 states. [2020-07-20 22:33:45,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 375 transitions. [2020-07-20 22:33:45,590 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 375 transitions. Word has length 427 [2020-07-20 22:33:45,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:33:45,590 INFO L479 AbstractCegarLoop]: Abstraction has 352 states and 375 transitions. [2020-07-20 22:33:45,590 INFO L480 AbstractCegarLoop]: Interpolant automaton has 128 states. [2020-07-20 22:33:45,590 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 375 transitions. [2020-07-20 22:33:45,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 430 [2020-07-20 22:33:45,593 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:33:45,593 INFO L422 BasicCegarLoop]: trace histogram [43, 42, 42, 42, 42, 41, 41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:33:45,805 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:33:45,805 INFO L427 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:33:45,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:33:45,806 INFO L82 PathProgramCache]: Analyzing trace with hash -2037930614, now seen corresponding path program 62 times [2020-07-20 22:33:45,807 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:33:45,807 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1646160637] [2020-07-20 22:33:45,807 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 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:33:45,974 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:33:45,975 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:33:45,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 1055 conjuncts, 87 conjunts are in the unsatisfiable core [2020-07-20 22:33:45,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:33:47,694 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:33:47,882 INFO L134 CoverageAnalysis]: Checked inductivity of 8530 backedges. 1888 proven. 3362 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-20 22:33:47,882 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:33:47,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:33:51,497 INFO L134 CoverageAnalysis]: Checked inductivity of 8530 backedges. 1888 proven. 3362 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-20 22:33:51,498 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1646160637] [2020-07-20 22:33:51,498 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:33:51,498 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47] total 48 [2020-07-20 22:33:51,498 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618217399] [2020-07-20 22:33:51,499 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-20 22:33:51,499 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:33:51,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-20 22:33:51,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1039, Invalid=1217, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 22:33:51,500 INFO L87 Difference]: Start difference. First operand 352 states and 375 transitions. Second operand 48 states. [2020-07-20 22:33:52,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:33:52,321 INFO L93 Difference]: Finished difference Result 371 states and 396 transitions. [2020-07-20 22:33:52,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-20 22:33:52,323 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 429 [2020-07-20 22:33:52,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:33:52,325 INFO L225 Difference]: With dead ends: 371 [2020-07-20 22:33:52,325 INFO L226 Difference]: Without dead ends: 369 [2020-07-20 22:33:52,326 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 858 GetRequests, 727 SyntacticMatches, 84 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2057 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=1043, Invalid=1309, Unknown=0, NotChecked=0, Total=2352 [2020-07-20 22:33:52,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2020-07-20 22:33:52,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 364. [2020-07-20 22:33:52,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 364 states. [2020-07-20 22:33:52,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 388 transitions. [2020-07-20 22:33:52,338 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 388 transitions. Word has length 429 [2020-07-20 22:33:52,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:33:52,339 INFO L479 AbstractCegarLoop]: Abstraction has 364 states and 388 transitions. [2020-07-20 22:33:52,339 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-20 22:33:52,339 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 388 transitions. [2020-07-20 22:33:52,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 446 [2020-07-20 22:33:52,341 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:33:52,341 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 44, 43, 43, 43, 43, 43, 43, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:33:52,542 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:33:52,542 INFO L427 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:33:52,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:33:52,543 INFO L82 PathProgramCache]: Analyzing trace with hash -99716244, now seen corresponding path program 63 times [2020-07-20 22:33:52,543 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:33:52,544 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [436295676] [2020-07-20 22:33:52,544 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 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:33:52,713 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:33:52,713 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:33:52,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 1085 conjuncts, 88 conjunts are in the unsatisfiable core [2020-07-20 22:33:52,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:33:58,283 INFO L134 CoverageAnalysis]: Checked inductivity of 9202 backedges. 3948 proven. 1806 refuted. 0 times theorem prover too weak. 3448 trivial. 0 not checked. [2020-07-20 22:33:58,283 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:34:04,832 INFO L134 CoverageAnalysis]: Checked inductivity of 9202 backedges. 3782 proven. 1806 refuted. 0 times theorem prover too weak. 3614 trivial. 0 not checked. [2020-07-20 22:34:04,832 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [436295676] [2020-07-20 22:34:04,833 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:34:04,833 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88] total 131 [2020-07-20 22:34:04,833 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1187718932] [2020-07-20 22:34:04,834 INFO L459 AbstractCegarLoop]: Interpolant automaton has 131 states [2020-07-20 22:34:04,834 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:34:04,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2020-07-20 22:34:04,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3914, Invalid=13116, Unknown=0, NotChecked=0, Total=17030 [2020-07-20 22:34:04,836 INFO L87 Difference]: Start difference. First operand 364 states and 388 transitions. Second operand 131 states. [2020-07-20 22:34:12,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:34:12,190 INFO L93 Difference]: Finished difference Result 723 states and 876 transitions. [2020-07-20 22:34:12,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2020-07-20 22:34:12,190 INFO L78 Accepts]: Start accepts. Automaton has 131 states. Word has length 445 [2020-07-20 22:34:12,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:34:12,192 INFO L225 Difference]: With dead ends: 723 [2020-07-20 22:34:12,193 INFO L226 Difference]: Without dead ends: 538 [2020-07-20 22:34:12,195 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 932 GetRequests, 717 SyntacticMatches, 43 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8085 ImplicationChecksByTransitivity, 14.7s TimeCoverageRelationStatistics Valid=7741, Invalid=22361, Unknown=0, NotChecked=0, Total=30102 [2020-07-20 22:34:12,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 538 states. [2020-07-20 22:34:12,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 538 to 366. [2020-07-20 22:34:12,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 366 states. [2020-07-20 22:34:12,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 366 states to 366 states and 390 transitions. [2020-07-20 22:34:12,207 INFO L78 Accepts]: Start accepts. Automaton has 366 states and 390 transitions. Word has length 445 [2020-07-20 22:34:12,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:34:12,207 INFO L479 AbstractCegarLoop]: Abstraction has 366 states and 390 transitions. [2020-07-20 22:34:12,207 INFO L480 AbstractCegarLoop]: Interpolant automaton has 131 states. [2020-07-20 22:34:12,207 INFO L276 IsEmpty]: Start isEmpty. Operand 366 states and 390 transitions. [2020-07-20 22:34:12,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 448 [2020-07-20 22:34:12,210 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:34:12,210 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 44, 44, 43, 43, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:34:12,418 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:34:12,418 INFO L427 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:34:12,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:34:12,419 INFO L82 PathProgramCache]: Analyzing trace with hash 592048017, now seen corresponding path program 64 times [2020-07-20 22:34:12,419 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:34:12,419 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1960642904] [2020-07-20 22:34:12,421 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:34:12,582 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:34:12,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:34:12,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 1093 conjuncts, 90 conjunts are in the unsatisfiable core [2020-07-20 22:34:12,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:34:18,738 INFO L134 CoverageAnalysis]: Checked inductivity of 9288 backedges. 3784 proven. 1892 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-20 22:34:18,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:34:25,957 INFO L134 CoverageAnalysis]: Checked inductivity of 9288 backedges. 3784 proven. 1892 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-20 22:34:25,957 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1960642904] [2020-07-20 22:34:25,958 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:34:25,958 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 90] total 134 [2020-07-20 22:34:25,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091019129] [2020-07-20 22:34:25,958 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2020-07-20 22:34:25,959 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:34:25,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2020-07-20 22:34:25,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4093, Invalid=13729, Unknown=0, NotChecked=0, Total=17822 [2020-07-20 22:34:25,960 INFO L87 Difference]: Start difference. First operand 366 states and 390 transitions. Second operand 134 states. [2020-07-20 22:34:33,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:34:33,517 INFO L93 Difference]: Finished difference Result 727 states and 883 transitions. [2020-07-20 22:34:33,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2020-07-20 22:34:33,517 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 447 [2020-07-20 22:34:33,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:34:33,519 INFO L225 Difference]: With dead ends: 727 [2020-07-20 22:34:33,519 INFO L226 Difference]: Without dead ends: 544 [2020-07-20 22:34:33,521 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 937 GetRequests, 717 SyntacticMatches, 44 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8471 ImplicationChecksByTransitivity, 16.1s TimeCoverageRelationStatistics Valid=8097, Invalid=23409, Unknown=0, NotChecked=0, Total=31506 [2020-07-20 22:34:33,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 544 states. [2020-07-20 22:34:33,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 544 to 368. [2020-07-20 22:34:33,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2020-07-20 22:34:33,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 392 transitions. [2020-07-20 22:34:33,538 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 392 transitions. Word has length 447 [2020-07-20 22:34:33,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:34:33,538 INFO L479 AbstractCegarLoop]: Abstraction has 368 states and 392 transitions. [2020-07-20 22:34:33,538 INFO L480 AbstractCegarLoop]: Interpolant automaton has 134 states. [2020-07-20 22:34:33,538 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 392 transitions. [2020-07-20 22:34:33,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 450 [2020-07-20 22:34:33,540 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:34:33,540 INFO L422 BasicCegarLoop]: trace histogram [45, 44, 44, 44, 44, 43, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:34:33,740 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:34:33,741 INFO L427 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:34:33,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:34:33,742 INFO L82 PathProgramCache]: Analyzing trace with hash -342428042, now seen corresponding path program 65 times [2020-07-20 22:34:33,742 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:34:33,742 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1547361323] [2020-07-20 22:34:33,742 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 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:34:33,926 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:34:33,926 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:34:33,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 1104 conjuncts, 91 conjunts are in the unsatisfiable core [2020-07-20 22:34:33,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:34:35,952 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:34:36,148 INFO L134 CoverageAnalysis]: Checked inductivity of 9376 backedges. 2066 proven. 3698 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-20 22:34:36,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:34:36,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:34:40,400 INFO L134 CoverageAnalysis]: Checked inductivity of 9376 backedges. 2066 proven. 3698 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-20 22:34:40,401 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1547361323] [2020-07-20 22:34:40,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:34:40,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 50 [2020-07-20 22:34:40,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799427702] [2020-07-20 22:34:40,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-20 22:34:40,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:34:40,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-20 22:34:40,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1132, Invalid=1318, Unknown=0, NotChecked=0, Total=2450 [2020-07-20 22:34:40,403 INFO L87 Difference]: Start difference. First operand 368 states and 392 transitions. Second operand 50 states. [2020-07-20 22:34:41,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:34:41,409 INFO L93 Difference]: Finished difference Result 387 states and 413 transitions. [2020-07-20 22:34:41,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-20 22:34:41,411 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 449 [2020-07-20 22:34:41,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:34:41,413 INFO L225 Difference]: With dead ends: 387 [2020-07-20 22:34:41,414 INFO L226 Difference]: Without dead ends: 385 [2020-07-20 22:34:41,414 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 898 GetRequests, 761 SyntacticMatches, 88 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2243 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=1136, Invalid=1414, Unknown=0, NotChecked=0, Total=2550 [2020-07-20 22:34:41,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2020-07-20 22:34:41,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 380. [2020-07-20 22:34:41,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 380 states. [2020-07-20 22:34:41,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 380 states to 380 states and 405 transitions. [2020-07-20 22:34:41,428 INFO L78 Accepts]: Start accepts. Automaton has 380 states and 405 transitions. Word has length 449 [2020-07-20 22:34:41,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:34:41,428 INFO L479 AbstractCegarLoop]: Abstraction has 380 states and 405 transitions. [2020-07-20 22:34:41,428 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-20 22:34:41,428 INFO L276 IsEmpty]: Start isEmpty. Operand 380 states and 405 transitions. [2020-07-20 22:34:41,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 466 [2020-07-20 22:34:41,430 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:34:41,430 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 46, 45, 45, 45, 45, 45, 45, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:34:41,630 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:34:41,631 INFO L427 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:34:41,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:34:41,631 INFO L82 PathProgramCache]: Analyzing trace with hash -753505192, now seen corresponding path program 66 times [2020-07-20 22:34:41,632 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:34:41,632 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [770928331] [2020-07-20 22:34:41,632 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 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:34:41,818 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:34:41,818 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:34:41,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 1134 conjuncts, 92 conjunts are in the unsatisfiable core [2020-07-20 22:34:41,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:34:48,691 INFO L134 CoverageAnalysis]: Checked inductivity of 10080 backedges. 4312 proven. 1980 refuted. 0 times theorem prover too weak. 3788 trivial. 0 not checked. [2020-07-20 22:34:48,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:34:57,934 INFO L134 CoverageAnalysis]: Checked inductivity of 10080 backedges. 4138 proven. 1980 refuted. 0 times theorem prover too weak. 3962 trivial. 0 not checked. [2020-07-20 22:34:57,935 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [770928331] [2020-07-20 22:34:57,935 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:34:57,935 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92] total 137 [2020-07-20 22:34:57,935 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060915530] [2020-07-20 22:34:57,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 137 states [2020-07-20 22:34:57,936 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:34:57,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2020-07-20 22:34:57,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4276, Invalid=14356, Unknown=0, NotChecked=0, Total=18632 [2020-07-20 22:34:57,938 INFO L87 Difference]: Start difference. First operand 380 states and 405 transitions. Second operand 137 states. [2020-07-20 22:35:07,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:35:07,383 INFO L93 Difference]: Finished difference Result 755 states and 915 transitions. [2020-07-20 22:35:07,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2020-07-20 22:35:07,383 INFO L78 Accepts]: Start accepts. Automaton has 137 states. Word has length 465 [2020-07-20 22:35:07,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:35:07,385 INFO L225 Difference]: With dead ends: 755 [2020-07-20 22:35:07,385 INFO L226 Difference]: Without dead ends: 562 [2020-07-20 22:35:07,387 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 974 GetRequests, 749 SyntacticMatches, 45 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8866 ImplicationChecksByTransitivity, 19.3s TimeCoverageRelationStatistics Valid=8461, Invalid=24481, Unknown=0, NotChecked=0, Total=32942 [2020-07-20 22:35:07,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 562 states. [2020-07-20 22:35:07,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 562 to 382. [2020-07-20 22:35:07,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 382 states. [2020-07-20 22:35:07,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 407 transitions. [2020-07-20 22:35:07,400 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 407 transitions. Word has length 465 [2020-07-20 22:35:07,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:35:07,400 INFO L479 AbstractCegarLoop]: Abstraction has 382 states and 407 transitions. [2020-07-20 22:35:07,400 INFO L480 AbstractCegarLoop]: Interpolant automaton has 137 states. [2020-07-20 22:35:07,400 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 407 transitions. [2020-07-20 22:35:07,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-07-20 22:35:07,402 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:35:07,402 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 46, 46, 45, 45, 45, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:35:07,603 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:35:07,603 INFO L427 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:35:07,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:35:07,604 INFO L82 PathProgramCache]: Analyzing trace with hash -103324675, now seen corresponding path program 67 times [2020-07-20 22:35:07,604 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:35:07,605 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1299580570] [2020-07-20 22:35:07,605 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 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:35:07,780 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:35:07,780 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:35:07,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 1142 conjuncts, 94 conjunts are in the unsatisfiable core [2020-07-20 22:35:07,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:35:15,434 INFO L134 CoverageAnalysis]: Checked inductivity of 10170 backedges. 4140 proven. 2070 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-20 22:35:15,434 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:35:25,140 INFO L134 CoverageAnalysis]: Checked inductivity of 10170 backedges. 4140 proven. 2070 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-20 22:35:25,141 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1299580570] [2020-07-20 22:35:25,141 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:35:25,141 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [94, 94] total 140 [2020-07-20 22:35:25,141 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500789438] [2020-07-20 22:35:25,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 140 states [2020-07-20 22:35:25,142 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:35:25,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2020-07-20 22:35:25,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4463, Invalid=14997, Unknown=0, NotChecked=0, Total=19460 [2020-07-20 22:35:25,143 INFO L87 Difference]: Start difference. First operand 382 states and 407 transitions. Second operand 140 states. [2020-07-20 22:35:35,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:35:35,191 INFO L93 Difference]: Finished difference Result 759 states and 922 transitions. [2020-07-20 22:35:35,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2020-07-20 22:35:35,191 INFO L78 Accepts]: Start accepts. Automaton has 140 states. Word has length 467 [2020-07-20 22:35:35,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:35:35,194 INFO L225 Difference]: With dead ends: 759 [2020-07-20 22:35:35,194 INFO L226 Difference]: Without dead ends: 568 [2020-07-20 22:35:35,196 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 979 GetRequests, 749 SyntacticMatches, 46 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9270 ImplicationChecksByTransitivity, 20.8s TimeCoverageRelationStatistics Valid=8833, Invalid=25577, Unknown=0, NotChecked=0, Total=34410 [2020-07-20 22:35:35,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 568 states. [2020-07-20 22:35:35,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 568 to 384. [2020-07-20 22:35:35,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 384 states. [2020-07-20 22:35:35,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 384 states to 384 states and 409 transitions. [2020-07-20 22:35:35,210 INFO L78 Accepts]: Start accepts. Automaton has 384 states and 409 transitions. Word has length 467 [2020-07-20 22:35:35,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:35:35,210 INFO L479 AbstractCegarLoop]: Abstraction has 384 states and 409 transitions. [2020-07-20 22:35:35,210 INFO L480 AbstractCegarLoop]: Interpolant automaton has 140 states. [2020-07-20 22:35:35,210 INFO L276 IsEmpty]: Start isEmpty. Operand 384 states and 409 transitions. [2020-07-20 22:35:35,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 470 [2020-07-20 22:35:35,212 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:35:35,212 INFO L422 BasicCegarLoop]: trace histogram [47, 46, 46, 46, 46, 45, 45, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:35:35,413 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:35:35,413 INFO L427 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:35:35,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:35:35,414 INFO L82 PathProgramCache]: Analyzing trace with hash 1949894242, now seen corresponding path program 68 times [2020-07-20 22:35:35,414 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:35:35,414 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1342183288] [2020-07-20 22:35:35,415 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 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:35:35,583 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:35:35,584 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:35:35,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 1153 conjuncts, 95 conjunts are in the unsatisfiable core [2020-07-20 22:35:35,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:35:38,189 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:35:38,435 INFO L134 CoverageAnalysis]: Checked inductivity of 10262 backedges. 2252 proven. 4050 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-20 22:35:38,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:35:38,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:35:44,240 INFO L134 CoverageAnalysis]: Checked inductivity of 10262 backedges. 2252 proven. 4050 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-20 22:35:44,241 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1342183288] [2020-07-20 22:35:44,241 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:35:44,241 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51] total 52 [2020-07-20 22:35:44,241 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304380596] [2020-07-20 22:35:44,242 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-07-20 22:35:44,242 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:35:44,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-07-20 22:35:44,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1229, Invalid=1423, Unknown=0, NotChecked=0, Total=2652 [2020-07-20 22:35:44,242 INFO L87 Difference]: Start difference. First operand 384 states and 409 transitions. Second operand 52 states. [2020-07-20 22:35:45,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:35:45,543 INFO L93 Difference]: Finished difference Result 403 states and 430 transitions. [2020-07-20 22:35:45,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-20 22:35:45,545 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 469 [2020-07-20 22:35:45,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:35:45,549 INFO L225 Difference]: With dead ends: 403 [2020-07-20 22:35:45,549 INFO L226 Difference]: Without dead ends: 401 [2020-07-20 22:35:45,550 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 938 GetRequests, 795 SyntacticMatches, 92 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2437 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=1233, Invalid=1523, Unknown=0, NotChecked=0, Total=2756 [2020-07-20 22:35:45,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2020-07-20 22:35:45,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 396. [2020-07-20 22:35:45,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 396 states. [2020-07-20 22:35:45,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 422 transitions. [2020-07-20 22:35:45,567 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 422 transitions. Word has length 469 [2020-07-20 22:35:45,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:35:45,567 INFO L479 AbstractCegarLoop]: Abstraction has 396 states and 422 transitions. [2020-07-20 22:35:45,567 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-07-20 22:35:45,567 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 422 transitions. [2020-07-20 22:35:45,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 486 [2020-07-20 22:35:45,569 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:35:45,570 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 48, 47, 47, 47, 47, 47, 47, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:35:45,770 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:35:45,771 INFO L427 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:35:45,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:35:45,772 INFO L82 PathProgramCache]: Analyzing trace with hash 676537412, now seen corresponding path program 69 times [2020-07-20 22:35:45,772 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:35:45,772 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1640372010] [2020-07-20 22:35:45,773 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 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:35:45,954 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:35:45,954 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:35:45,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 1183 conjuncts, 96 conjunts are in the unsatisfiable core [2020-07-20 22:35:45,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:35:55,181 INFO L134 CoverageAnalysis]: Checked inductivity of 10998 backedges. 4692 proven. 2162 refuted. 0 times theorem prover too weak. 4144 trivial. 0 not checked. [2020-07-20 22:35:55,181 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:36:05,904 INFO L134 CoverageAnalysis]: Checked inductivity of 10998 backedges. 4510 proven. 2162 refuted. 0 times theorem prover too weak. 4326 trivial. 0 not checked. [2020-07-20 22:36:05,904 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1640372010] [2020-07-20 22:36:05,904 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:36:05,904 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96] total 143 [2020-07-20 22:36:05,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460583692] [2020-07-20 22:36:05,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 143 states [2020-07-20 22:36:05,905 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:36:05,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2020-07-20 22:36:05,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4654, Invalid=15652, Unknown=0, NotChecked=0, Total=20306 [2020-07-20 22:36:05,908 INFO L87 Difference]: Start difference. First operand 396 states and 422 transitions. Second operand 143 states. [2020-07-20 22:36:18,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:36:18,059 INFO L93 Difference]: Finished difference Result 787 states and 954 transitions. [2020-07-20 22:36:18,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-20 22:36:18,059 INFO L78 Accepts]: Start accepts. Automaton has 143 states. Word has length 485 [2020-07-20 22:36:18,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:36:18,062 INFO L225 Difference]: With dead ends: 787 [2020-07-20 22:36:18,062 INFO L226 Difference]: Without dead ends: 586 [2020-07-20 22:36:18,064 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1016 GetRequests, 781 SyntacticMatches, 47 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9683 ImplicationChecksByTransitivity, 24.3s TimeCoverageRelationStatistics Valid=9213, Invalid=26697, Unknown=0, NotChecked=0, Total=35910 [2020-07-20 22:36:18,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2020-07-20 22:36:18,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 398. [2020-07-20 22:36:18,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 398 states. [2020-07-20 22:36:18,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 398 states to 398 states and 424 transitions. [2020-07-20 22:36:18,080 INFO L78 Accepts]: Start accepts. Automaton has 398 states and 424 transitions. Word has length 485 [2020-07-20 22:36:18,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:36:18,080 INFO L479 AbstractCegarLoop]: Abstraction has 398 states and 424 transitions. [2020-07-20 22:36:18,080 INFO L480 AbstractCegarLoop]: Interpolant automaton has 143 states. [2020-07-20 22:36:18,080 INFO L276 IsEmpty]: Start isEmpty. Operand 398 states and 424 transitions. [2020-07-20 22:36:18,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-20 22:36:18,082 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:36:18,082 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 48, 48, 47, 47, 47, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:36:18,283 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:36:18,283 INFO L427 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:36:18,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:36:18,284 INFO L82 PathProgramCache]: Analyzing trace with hash 579393385, now seen corresponding path program 70 times [2020-07-20 22:36:18,284 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:36:18,285 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [47531784] [2020-07-20 22:36:18,285 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 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:36:18,468 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:36:18,469 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:36:18,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 1191 conjuncts, 98 conjunts are in the unsatisfiable core [2020-07-20 22:36:18,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:36:28,903 INFO L134 CoverageAnalysis]: Checked inductivity of 11092 backedges. 4512 proven. 2256 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-20 22:36:28,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:36:40,836 INFO L134 CoverageAnalysis]: Checked inductivity of 11092 backedges. 4512 proven. 2256 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-20 22:36:40,836 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [47531784] [2020-07-20 22:36:40,837 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:36:40,837 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98] total 146 [2020-07-20 22:36:40,837 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642914149] [2020-07-20 22:36:40,838 INFO L459 AbstractCegarLoop]: Interpolant automaton has 146 states [2020-07-20 22:36:40,838 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:36:40,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2020-07-20 22:36:40,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4849, Invalid=16321, Unknown=0, NotChecked=0, Total=21170 [2020-07-20 22:36:40,839 INFO L87 Difference]: Start difference. First operand 398 states and 424 transitions. Second operand 146 states. [2020-07-20 22:36:54,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:36:54,282 INFO L93 Difference]: Finished difference Result 791 states and 961 transitions. [2020-07-20 22:36:54,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2020-07-20 22:36:54,282 INFO L78 Accepts]: Start accepts. Automaton has 146 states. Word has length 487 [2020-07-20 22:36:54,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:36:54,285 INFO L225 Difference]: With dead ends: 791 [2020-07-20 22:36:54,285 INFO L226 Difference]: Without dead ends: 592 [2020-07-20 22:36:54,287 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 781 SyntacticMatches, 48 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10105 ImplicationChecksByTransitivity, 27.3s TimeCoverageRelationStatistics Valid=9601, Invalid=27841, Unknown=0, NotChecked=0, Total=37442 [2020-07-20 22:36:54,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2020-07-20 22:36:54,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 400. [2020-07-20 22:36:54,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 400 states. [2020-07-20 22:36:54,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 426 transitions. [2020-07-20 22:36:54,302 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 426 transitions. Word has length 487 [2020-07-20 22:36:54,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:36:54,302 INFO L479 AbstractCegarLoop]: Abstraction has 400 states and 426 transitions. [2020-07-20 22:36:54,303 INFO L480 AbstractCegarLoop]: Interpolant automaton has 146 states. [2020-07-20 22:36:54,303 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 426 transitions. [2020-07-20 22:36:54,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-20 22:36:54,305 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:36:54,306 INFO L422 BasicCegarLoop]: trace histogram [49, 48, 48, 48, 48, 47, 47, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:36:54,508 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:36:54,509 INFO L427 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:36:54,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:36:54,509 INFO L82 PathProgramCache]: Analyzing trace with hash 1713263950, now seen corresponding path program 71 times [2020-07-20 22:36:54,510 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:36:54,510 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [958773531] [2020-07-20 22:36:54,510 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 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:36:54,701 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:36:54,701 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:36:54,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 1202 conjuncts, 99 conjunts are in the unsatisfiable core [2020-07-20 22:36:54,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:36:58,476 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:36:58,736 INFO L134 CoverageAnalysis]: Checked inductivity of 11188 backedges. 2446 proven. 4418 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-20 22:36:58,737 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:36:58,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:37:05,925 INFO L134 CoverageAnalysis]: Checked inductivity of 11188 backedges. 2446 proven. 4418 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-20 22:37:05,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [958773531] [2020-07-20 22:37:05,926 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:37:05,926 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53] total 54 [2020-07-20 22:37:05,926 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299964935] [2020-07-20 22:37:05,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-07-20 22:37:05,927 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:37:05,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-07-20 22:37:05,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1330, Invalid=1532, Unknown=0, NotChecked=0, Total=2862 [2020-07-20 22:37:05,927 INFO L87 Difference]: Start difference. First operand 400 states and 426 transitions. Second operand 54 states. [2020-07-20 22:37:07,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:37:07,470 INFO L93 Difference]: Finished difference Result 419 states and 447 transitions. [2020-07-20 22:37:07,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-20 22:37:07,472 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 489 [2020-07-20 22:37:07,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:37:07,475 INFO L225 Difference]: With dead ends: 419 [2020-07-20 22:37:07,475 INFO L226 Difference]: Without dead ends: 417 [2020-07-20 22:37:07,476 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 978 GetRequests, 829 SyntacticMatches, 96 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2639 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=1334, Invalid=1636, Unknown=0, NotChecked=0, Total=2970 [2020-07-20 22:37:07,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2020-07-20 22:37:07,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 412. [2020-07-20 22:37:07,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 412 states. [2020-07-20 22:37:07,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 412 states to 412 states and 439 transitions. [2020-07-20 22:37:07,492 INFO L78 Accepts]: Start accepts. Automaton has 412 states and 439 transitions. Word has length 489 [2020-07-20 22:37:07,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:37:07,492 INFO L479 AbstractCegarLoop]: Abstraction has 412 states and 439 transitions. [2020-07-20 22:37:07,492 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-07-20 22:37:07,492 INFO L276 IsEmpty]: Start isEmpty. Operand 412 states and 439 transitions. [2020-07-20 22:37:07,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2020-07-20 22:37:07,494 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:37:07,495 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 49, 49, 49, 49, 49, 49, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:37:07,695 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:37:07,695 INFO L427 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:37:07,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:37:07,696 INFO L82 PathProgramCache]: Analyzing trace with hash -831186128, now seen corresponding path program 72 times [2020-07-20 22:37:07,696 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:37:07,697 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [753136993] [2020-07-20 22:37:07,697 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 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:37:07,886 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:37:07,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:37:07,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 1232 conjuncts, 100 conjunts are in the unsatisfiable core [2020-07-20 22:37:07,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:37:20,540 INFO L134 CoverageAnalysis]: Checked inductivity of 11956 backedges. 5088 proven. 2352 refuted. 0 times theorem prover too weak. 4516 trivial. 0 not checked. [2020-07-20 22:37:20,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:37:35,619 INFO L134 CoverageAnalysis]: Checked inductivity of 11956 backedges. 4898 proven. 2352 refuted. 0 times theorem prover too weak. 4706 trivial. 0 not checked. [2020-07-20 22:37:35,619 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [753136993] [2020-07-20 22:37:35,619 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:37:35,620 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 100] total 149 [2020-07-20 22:37:35,620 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249597189] [2020-07-20 22:37:35,620 INFO L459 AbstractCegarLoop]: Interpolant automaton has 149 states [2020-07-20 22:37:35,621 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:37:35,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 149 interpolants. [2020-07-20 22:37:35,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5048, Invalid=17004, Unknown=0, NotChecked=0, Total=22052 [2020-07-20 22:37:35,634 INFO L87 Difference]: Start difference. First operand 412 states and 439 transitions. Second operand 149 states. [2020-07-20 22:37:52,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:37:52,930 INFO L93 Difference]: Finished difference Result 819 states and 993 transitions. [2020-07-20 22:37:52,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2020-07-20 22:37:52,931 INFO L78 Accepts]: Start accepts. Automaton has 149 states. Word has length 505 [2020-07-20 22:37:52,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:37:52,933 INFO L225 Difference]: With dead ends: 819 [2020-07-20 22:37:52,933 INFO L226 Difference]: Without dead ends: 610 [2020-07-20 22:37:52,935 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1058 GetRequests, 813 SyntacticMatches, 49 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10536 ImplicationChecksByTransitivity, 33.8s TimeCoverageRelationStatistics Valid=9997, Invalid=29009, Unknown=0, NotChecked=0, Total=39006 [2020-07-20 22:37:52,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2020-07-20 22:37:52,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 414. [2020-07-20 22:37:52,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 414 states. [2020-07-20 22:37:52,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 441 transitions. [2020-07-20 22:37:52,951 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 441 transitions. Word has length 505 [2020-07-20 22:37:52,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:37:52,951 INFO L479 AbstractCegarLoop]: Abstraction has 414 states and 441 transitions. [2020-07-20 22:37:52,951 INFO L480 AbstractCegarLoop]: Interpolant automaton has 149 states. [2020-07-20 22:37:52,951 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 441 transitions. [2020-07-20 22:37:52,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-20 22:37:52,954 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:37:52,954 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 50, 49, 49, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:37:53,154 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:37:53,155 INFO L427 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:37:53,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:37:53,156 INFO L82 PathProgramCache]: Analyzing trace with hash 1643039189, now seen corresponding path program 73 times [2020-07-20 22:37:53,156 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:37:53,156 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [19940636] [2020-07-20 22:37:53,157 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 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:37:53,348 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:37:53,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:37:53,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 1240 conjuncts, 102 conjunts are in the unsatisfiable core [2020-07-20 22:37:53,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:38:05,954 INFO L134 CoverageAnalysis]: Checked inductivity of 12054 backedges. 4900 proven. 2450 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-20 22:38:05,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:38:21,206 INFO L134 CoverageAnalysis]: Checked inductivity of 12054 backedges. 4900 proven. 2450 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-20 22:38:21,206 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [19940636] [2020-07-20 22:38:21,206 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:38:21,206 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 102] total 152 [2020-07-20 22:38:21,207 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2141912802] [2020-07-20 22:38:21,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 152 states [2020-07-20 22:38:21,207 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:38:21,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2020-07-20 22:38:21,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5251, Invalid=17701, Unknown=0, NotChecked=0, Total=22952 [2020-07-20 22:38:21,209 INFO L87 Difference]: Start difference. First operand 414 states and 441 transitions. Second operand 152 states. [2020-07-20 22:38:38,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:38:38,750 INFO L93 Difference]: Finished difference Result 823 states and 1000 transitions. [2020-07-20 22:38:38,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2020-07-20 22:38:38,750 INFO L78 Accepts]: Start accepts. Automaton has 152 states. Word has length 507 [2020-07-20 22:38:38,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:38:38,753 INFO L225 Difference]: With dead ends: 823 [2020-07-20 22:38:38,753 INFO L226 Difference]: Without dead ends: 616 [2020-07-20 22:38:38,757 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1063 GetRequests, 813 SyntacticMatches, 50 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10976 ImplicationChecksByTransitivity, 34.2s TimeCoverageRelationStatistics Valid=10401, Invalid=30201, Unknown=0, NotChecked=0, Total=40602 [2020-07-20 22:38:38,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 616 states. [2020-07-20 22:38:38,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 616 to 416. [2020-07-20 22:38:38,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 416 states. [2020-07-20 22:38:38,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 416 states to 416 states and 443 transitions. [2020-07-20 22:38:38,780 INFO L78 Accepts]: Start accepts. Automaton has 416 states and 443 transitions. Word has length 507 [2020-07-20 22:38:38,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:38:38,780 INFO L479 AbstractCegarLoop]: Abstraction has 416 states and 443 transitions. [2020-07-20 22:38:38,781 INFO L480 AbstractCegarLoop]: Interpolant automaton has 152 states. [2020-07-20 22:38:38,781 INFO L276 IsEmpty]: Start isEmpty. Operand 416 states and 443 transitions. [2020-07-20 22:38:38,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 510 [2020-07-20 22:38:38,783 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:38:38,783 INFO L422 BasicCegarLoop]: trace histogram [51, 50, 50, 50, 50, 49, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:38:38,984 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:38:38,984 INFO L427 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:38:38,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:38:38,985 INFO L82 PathProgramCache]: Analyzing trace with hash -38313158, now seen corresponding path program 74 times [2020-07-20 22:38:38,985 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:38:38,985 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [568517888] [2020-07-20 22:38:38,986 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:38:39,188 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:38:39,188 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:38:39,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 1251 conjuncts, 103 conjunts are in the unsatisfiable core [2020-07-20 22:38:39,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:38:43,740 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:38:44,045 INFO L134 CoverageAnalysis]: Checked inductivity of 12154 backedges. 2648 proven. 4802 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-20 22:38:44,046 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:38:44,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:38:53,406 INFO L134 CoverageAnalysis]: Checked inductivity of 12154 backedges. 2648 proven. 4802 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-20 22:38:53,406 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [568517888] [2020-07-20 22:38:53,406 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:38:53,406 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55] total 56 [2020-07-20 22:38:53,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1227235386] [2020-07-20 22:38:53,407 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-07-20 22:38:53,407 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:38:53,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-07-20 22:38:53,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1435, Invalid=1645, Unknown=0, NotChecked=0, Total=3080 [2020-07-20 22:38:53,408 INFO L87 Difference]: Start difference. First operand 416 states and 443 transitions. Second operand 56 states. [2020-07-20 22:38:55,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:38:55,488 INFO L93 Difference]: Finished difference Result 435 states and 464 transitions. [2020-07-20 22:38:55,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-07-20 22:38:55,492 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 509 [2020-07-20 22:38:55,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:38:55,496 INFO L225 Difference]: With dead ends: 435 [2020-07-20 22:38:55,496 INFO L226 Difference]: Without dead ends: 433 [2020-07-20 22:38:55,497 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1018 GetRequests, 863 SyntacticMatches, 100 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2849 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=1439, Invalid=1753, Unknown=0, NotChecked=0, Total=3192 [2020-07-20 22:38:55,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 433 states. [2020-07-20 22:38:55,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 433 to 428. [2020-07-20 22:38:55,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 428 states. [2020-07-20 22:38:55,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 428 states to 428 states and 456 transitions. [2020-07-20 22:38:55,519 INFO L78 Accepts]: Start accepts. Automaton has 428 states and 456 transitions. Word has length 509 [2020-07-20 22:38:55,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:38:55,519 INFO L479 AbstractCegarLoop]: Abstraction has 428 states and 456 transitions. [2020-07-20 22:38:55,519 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-07-20 22:38:55,520 INFO L276 IsEmpty]: Start isEmpty. Operand 428 states and 456 transitions. [2020-07-20 22:38:55,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 526 [2020-07-20 22:38:55,522 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:38:55,522 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 52, 51, 51, 51, 51, 51, 51, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:38:55,725 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:38:55,726 INFO L427 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:38:55,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:38:55,726 INFO L82 PathProgramCache]: Analyzing trace with hash 283955484, now seen corresponding path program 75 times [2020-07-20 22:38:55,727 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:38:55,727 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [517887246] [2020-07-20 22:38:55,727 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 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:38:55,929 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:38:55,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:38:55,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 1281 conjuncts, 104 conjunts are in the unsatisfiable core [2020-07-20 22:38:55,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:39:10,566 INFO L134 CoverageAnalysis]: Checked inductivity of 12954 backedges. 5500 proven. 2550 refuted. 0 times theorem prover too weak. 4904 trivial. 0 not checked. [2020-07-20 22:39:10,566 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:39:28,086 INFO L134 CoverageAnalysis]: Checked inductivity of 12954 backedges. 5302 proven. 2550 refuted. 0 times theorem prover too weak. 5102 trivial. 0 not checked. [2020-07-20 22:39:28,086 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [517887246] [2020-07-20 22:39:28,086 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:39:28,087 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [104, 104] total 155 [2020-07-20 22:39:28,087 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029998535] [2020-07-20 22:39:28,088 INFO L459 AbstractCegarLoop]: Interpolant automaton has 155 states [2020-07-20 22:39:28,088 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:39:28,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2020-07-20 22:39:28,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5458, Invalid=18412, Unknown=0, NotChecked=0, Total=23870 [2020-07-20 22:39:28,089 INFO L87 Difference]: Start difference. First operand 428 states and 456 transitions. Second operand 155 states. [2020-07-20 22:39:48,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:39:48,386 INFO L93 Difference]: Finished difference Result 851 states and 1032 transitions. [2020-07-20 22:39:48,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2020-07-20 22:39:48,386 INFO L78 Accepts]: Start accepts. Automaton has 155 states. Word has length 525 [2020-07-20 22:39:48,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:39:48,389 INFO L225 Difference]: With dead ends: 851 [2020-07-20 22:39:48,389 INFO L226 Difference]: Without dead ends: 634 [2020-07-20 22:39:48,393 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1100 GetRequests, 845 SyntacticMatches, 51 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11425 ImplicationChecksByTransitivity, 39.4s TimeCoverageRelationStatistics Valid=10813, Invalid=31417, Unknown=0, NotChecked=0, Total=42230 [2020-07-20 22:39:48,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 634 states. [2020-07-20 22:39:48,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 634 to 430. [2020-07-20 22:39:48,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 430 states. [2020-07-20 22:39:48,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 458 transitions. [2020-07-20 22:39:48,421 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 458 transitions. Word has length 525 [2020-07-20 22:39:48,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:39:48,421 INFO L479 AbstractCegarLoop]: Abstraction has 430 states and 458 transitions. [2020-07-20 22:39:48,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 155 states. [2020-07-20 22:39:48,421 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 458 transitions. [2020-07-20 22:39:48,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 528 [2020-07-20 22:39:48,425 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:39:48,426 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 52, 52, 51, 51, 51, 51, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:39:48,639 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:39:48,640 INFO L427 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:39:48,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:39:48,640 INFO L82 PathProgramCache]: Analyzing trace with hash 1129954113, now seen corresponding path program 76 times [2020-07-20 22:39:48,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:39:48,641 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1741766480] [2020-07-20 22:39:48,641 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 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:39:48,845 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:39:48,846 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:39:48,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 1289 conjuncts, 106 conjunts are in the unsatisfiable core [2020-07-20 22:39:48,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:40:05,556 INFO L134 CoverageAnalysis]: Checked inductivity of 13056 backedges. 5304 proven. 2652 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-20 22:40:05,556 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:40:25,732 INFO L134 CoverageAnalysis]: Checked inductivity of 13056 backedges. 5304 proven. 2652 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-20 22:40:25,733 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1741766480] [2020-07-20 22:40:25,733 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:40:25,733 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [106, 106] total 158 [2020-07-20 22:40:25,733 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [610390949] [2020-07-20 22:40:25,734 INFO L459 AbstractCegarLoop]: Interpolant automaton has 158 states [2020-07-20 22:40:25,734 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:40:25,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2020-07-20 22:40:25,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5669, Invalid=19137, Unknown=0, NotChecked=0, Total=24806 [2020-07-20 22:40:25,736 INFO L87 Difference]: Start difference. First operand 430 states and 458 transitions. Second operand 158 states. [2020-07-20 22:40:48,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:40:48,339 INFO L93 Difference]: Finished difference Result 855 states and 1039 transitions. [2020-07-20 22:40:48,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2020-07-20 22:40:48,339 INFO L78 Accepts]: Start accepts. Automaton has 158 states. Word has length 527 [2020-07-20 22:40:48,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:40:48,343 INFO L225 Difference]: With dead ends: 855 [2020-07-20 22:40:48,343 INFO L226 Difference]: Without dead ends: 640 [2020-07-20 22:40:48,347 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1105 GetRequests, 845 SyntacticMatches, 52 SemanticMatches, 208 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11883 ImplicationChecksByTransitivity, 45.1s TimeCoverageRelationStatistics Valid=11233, Invalid=32657, Unknown=0, NotChecked=0, Total=43890 [2020-07-20 22:40:48,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 640 states. [2020-07-20 22:40:48,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 640 to 432. [2020-07-20 22:40:48,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 432 states. [2020-07-20 22:40:48,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 432 states to 432 states and 460 transitions. [2020-07-20 22:40:48,374 INFO L78 Accepts]: Start accepts. Automaton has 432 states and 460 transitions. Word has length 527 [2020-07-20 22:40:48,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:40:48,374 INFO L479 AbstractCegarLoop]: Abstraction has 432 states and 460 transitions. [2020-07-20 22:40:48,374 INFO L480 AbstractCegarLoop]: Interpolant automaton has 158 states. [2020-07-20 22:40:48,374 INFO L276 IsEmpty]: Start isEmpty. Operand 432 states and 460 transitions. [2020-07-20 22:40:48,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 530 [2020-07-20 22:40:48,378 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:40:48,379 INFO L422 BasicCegarLoop]: trace histogram [53, 52, 52, 52, 52, 51, 51, 51, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:40:48,591 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:40:48,592 INFO L427 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:40:48,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:40:48,593 INFO L82 PathProgramCache]: Analyzing trace with hash -1909149658, now seen corresponding path program 77 times [2020-07-20 22:40:48,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:40:48,594 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [801829875] [2020-07-20 22:40:48,594 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 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:40:48,890 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:40:48,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:40:48,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 1300 conjuncts, 107 conjunts are in the unsatisfiable core [2020-07-20 22:40:48,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:40:54,775 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:40:55,182 INFO L134 CoverageAnalysis]: Checked inductivity of 13160 backedges. 2858 proven. 5202 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-20 22:40:55,182 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:40:55,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:41:07,516 INFO L134 CoverageAnalysis]: Checked inductivity of 13160 backedges. 2858 proven. 5202 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-20 22:41:07,517 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [801829875] [2020-07-20 22:41:07,517 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:41:07,517 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57] total 58 [2020-07-20 22:41:07,517 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2007193260] [2020-07-20 22:41:07,518 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-07-20 22:41:07,518 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:41:07,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-07-20 22:41:07,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1544, Invalid=1762, Unknown=0, NotChecked=0, Total=3306 [2020-07-20 22:41:07,519 INFO L87 Difference]: Start difference. First operand 432 states and 460 transitions. Second operand 58 states. [2020-07-20 22:41:10,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:41:10,292 INFO L93 Difference]: Finished difference Result 451 states and 481 transitions. [2020-07-20 22:41:10,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-07-20 22:41:10,296 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 529 [2020-07-20 22:41:10,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:41:10,300 INFO L225 Difference]: With dead ends: 451 [2020-07-20 22:41:10,300 INFO L226 Difference]: Without dead ends: 449 [2020-07-20 22:41:10,300 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1058 GetRequests, 897 SyntacticMatches, 104 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3067 ImplicationChecksByTransitivity, 17.2s TimeCoverageRelationStatistics Valid=1548, Invalid=1874, Unknown=0, NotChecked=0, Total=3422 [2020-07-20 22:41:10,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 449 states. [2020-07-20 22:41:10,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 449 to 444. [2020-07-20 22:41:10,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 444 states. [2020-07-20 22:41:10,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 444 states to 444 states and 473 transitions. [2020-07-20 22:41:10,323 INFO L78 Accepts]: Start accepts. Automaton has 444 states and 473 transitions. Word has length 529 [2020-07-20 22:41:10,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:41:10,323 INFO L479 AbstractCegarLoop]: Abstraction has 444 states and 473 transitions. [2020-07-20 22:41:10,323 INFO L480 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-07-20 22:41:10,323 INFO L276 IsEmpty]: Start isEmpty. Operand 444 states and 473 transitions. [2020-07-20 22:41:10,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 546 [2020-07-20 22:41:10,326 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:41:10,326 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 54, 53, 53, 53, 53, 53, 53, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:41:10,527 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:41:10,527 INFO L427 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:41:10,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:41:10,528 INFO L82 PathProgramCache]: Analyzing trace with hash -773143032, now seen corresponding path program 78 times [2020-07-20 22:41:10,529 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:41:10,529 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1717391538] [2020-07-20 22:41:10,529 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 81 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:41:10,744 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:41:10,744 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:41:10,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 1330 conjuncts, 108 conjunts are in the unsatisfiable core [2020-07-20 22:41:10,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:41:29,851 INFO L134 CoverageAnalysis]: Checked inductivity of 13992 backedges. 5928 proven. 2756 refuted. 0 times theorem prover too weak. 5308 trivial. 0 not checked. [2020-07-20 22:41:29,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:41:52,773 INFO L134 CoverageAnalysis]: Checked inductivity of 13992 backedges. 5722 proven. 2756 refuted. 0 times theorem prover too weak. 5514 trivial. 0 not checked. [2020-07-20 22:41:52,773 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1717391538] [2020-07-20 22:41:52,773 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:41:52,774 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [108, 108] total 161 [2020-07-20 22:41:52,774 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [238669225] [2020-07-20 22:41:52,775 INFO L459 AbstractCegarLoop]: Interpolant automaton has 161 states [2020-07-20 22:41:52,775 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:41:52,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 161 interpolants. [2020-07-20 22:41:52,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5884, Invalid=19876, Unknown=0, NotChecked=0, Total=25760 [2020-07-20 22:41:52,777 INFO L87 Difference]: Start difference. First operand 444 states and 473 transitions. Second operand 161 states.