/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/nested9.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 01:47:54,348 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 01:47:54,351 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 01:47:54,362 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 01:47:54,362 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 01:47:54,363 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 01:47:54,365 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 01:47:54,366 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 01:47:54,368 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 01:47:54,369 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 01:47:54,370 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 01:47:54,371 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 01:47:54,371 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 01:47:54,372 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 01:47:54,373 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 01:47:54,374 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 01:47:54,375 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 01:47:54,376 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 01:47:54,377 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 01:47:54,379 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 01:47:54,380 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 01:47:54,381 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 01:47:54,383 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 01:47:54,383 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 01:47:54,386 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 01:47:54,393 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 01:47:54,394 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 01:47:54,394 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 01:47:54,395 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 01:47:54,409 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 01:47:54,409 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 01:47:54,410 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 01:47:54,411 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 01:47:54,411 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 01:47:54,411 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 01:47:54,411 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 01:47:54,411 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 01:47:54,412 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 01:47:54,412 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 01:47:54,412 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 01:47:54,412 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 01:47:54,412 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 01:47:54,413 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 01:47:54,413 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 01:47:54,413 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 01:47:54,413 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 01:47:54,413 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 01:47:54,414 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 01:47:54,414 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 01:47:54,414 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 01:47:54,414 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 01:47:54,414 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 01:47:54,415 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 01:47:54,415 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 01:47:54,415 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 01:47:54,415 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:54,415 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 01:47:54,416 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 01:47:54,416 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 01:47:54,701 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 01:47:54,715 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 01:47:54,718 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 01:47:54,719 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 01:47:54,720 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 01:47:54,720 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/nested9.i [2020-07-21 01:47:54,778 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1fd9f40be/5cfd1080bd964deea12ee4893e753c06/FLAG73ffcadf6 [2020-07-21 01:47:55,183 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 01:47:55,183 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/nested9.i [2020-07-21 01:47:55,188 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1fd9f40be/5cfd1080bd964deea12ee4893e753c06/FLAG73ffcadf6 [2020-07-21 01:47:55,608 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1fd9f40be/5cfd1080bd964deea12ee4893e753c06 [2020-07-21 01:47:55,620 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 01:47:55,623 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 01:47:55,626 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 01:47:55,626 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 01:47:55,629 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 01:47:55,630 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:47:55" (1/1) ... [2020-07-21 01:47:55,633 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7686a361 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:55, skipping insertion in model container [2020-07-21 01:47:55,633 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:47:55" (1/1) ... [2020-07-21 01:47:55,641 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 01:47:55,662 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 01:47:55,879 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:47:55,883 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 01:47:55,899 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:47:55,912 INFO L208 MainTranslator]: Completed translation [2020-07-21 01:47:55,913 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:55 WrapperNode [2020-07-21 01:47:55,913 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 01:47:55,913 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 01:47:55,914 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 01:47:55,914 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 01:47:55,925 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:55" (1/1) ... [2020-07-21 01:47:55,925 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:55" (1/1) ... [2020-07-21 01:47:55,930 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:55" (1/1) ... [2020-07-21 01:47:55,931 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:55" (1/1) ... [2020-07-21 01:47:55,935 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:55" (1/1) ... [2020-07-21 01:47:55,940 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:55" (1/1) ... [2020-07-21 01:47:55,941 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:55" (1/1) ... [2020-07-21 01:47:56,016 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 01:47:56,016 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 01:47:56,017 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 01:47:56,017 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 01:47:56,018 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:55" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 01:47:56,080 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 01:47:56,080 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 01:47:56,080 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 01:47:56,080 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 01:47:56,080 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 01:47:56,080 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 01:47:56,081 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 01:47:56,081 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 01:47:56,081 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 01:47:56,081 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 01:47:56,081 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 01:47:56,081 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 01:47:56,081 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 01:47:56,310 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 01:47:56,311 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-21 01:47:56,316 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:47:56 BoogieIcfgContainer [2020-07-21 01:47:56,316 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 01:47:56,318 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 01:47:56,318 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 01:47:56,321 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 01:47:56,321 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:47:55" (1/3) ... [2020-07-21 01:47:56,322 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34baccb8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:47:56, skipping insertion in model container [2020-07-21 01:47:56,322 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:55" (2/3) ... [2020-07-21 01:47:56,322 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34baccb8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:47:56, skipping insertion in model container [2020-07-21 01:47:56,323 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:47:56" (3/3) ... [2020-07-21 01:47:56,324 INFO L109 eAbstractionObserver]: Analyzing ICFG nested9.i [2020-07-21 01:47:56,335 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 01:47:56,344 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 01:47:56,360 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 01:47:56,386 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 01:47:56,386 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 01:47:56,386 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 01:47:56,387 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 01:47:56,387 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 01:47:56,387 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 01:47:56,387 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 01:47:56,387 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 01:47:56,408 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-07-21 01:47:56,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 01:47:56,418 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:56,419 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:56,419 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:56,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:56,430 INFO L82 PathProgramCache]: Analyzing trace with hash 1671060194, now seen corresponding path program 1 times [2020-07-21 01:47:56,438 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:56,439 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [470446237] [2020-07-21 01:47:56,439 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:56,530 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:47:56,531 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:56,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:47:56,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:56,597 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:47:56,597 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:47:56,598 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [470446237] [2020-07-21 01:47:56,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:47:56,599 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 01:47:56,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851009732] [2020-07-21 01:47:56,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 01:47:56,605 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:56,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 01:47:56,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 01:47:56,616 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 4 states. [2020-07-21 01:47:56,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:56,685 INFO L93 Difference]: Finished difference Result 53 states and 74 transitions. [2020-07-21 01:47:56,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 01:47:56,687 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-07-21 01:47:56,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:56,696 INFO L225 Difference]: With dead ends: 53 [2020-07-21 01:47:56,696 INFO L226 Difference]: Without dead ends: 27 [2020-07-21 01:47:56,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 01:47:56,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-21 01:47:56,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2020-07-21 01:47:56,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 01:47:56,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-07-21 01:47:56,741 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 18 [2020-07-21 01:47:56,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:56,741 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-07-21 01:47:56,741 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 01:47:56,742 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-07-21 01:47:56,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 01:47:56,743 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:56,743 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:56,958 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:56,958 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:56,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:56,960 INFO L82 PathProgramCache]: Analyzing trace with hash 514965223, now seen corresponding path program 1 times [2020-07-21 01:47:56,960 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:56,961 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [42527906] [2020-07-21 01:47:56,961 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:57,004 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:57,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:57,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 01:47:57,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:57,097 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:47:57,106 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:47:57,144 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:47:57,144 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:47:57,145 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [42527906] [2020-07-21 01:47:57,145 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:47:57,145 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 01:47:57,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560327438] [2020-07-21 01:47:57,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 01:47:57,151 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:57,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 01:47:57,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-21 01:47:57,153 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 8 states. [2020-07-21 01:47:57,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:57,251 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2020-07-21 01:47:57,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 01:47:57,252 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-07-21 01:47:57,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:57,253 INFO L225 Difference]: With dead ends: 39 [2020-07-21 01:47:57,254 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 01:47:57,255 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-21 01:47:57,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 01:47:57,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 32. [2020-07-21 01:47:57,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-21 01:47:57,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-07-21 01:47:57,264 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 21 [2020-07-21 01:47:57,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:57,265 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-07-21 01:47:57,265 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 01:47:57,265 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-07-21 01:47:57,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 01:47:57,266 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:57,267 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, 1] [2020-07-21 01:47:57,481 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:57,481 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:57,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:57,483 INFO L82 PathProgramCache]: Analyzing trace with hash -1134636734, now seen corresponding path program 1 times [2020-07-21 01:47:57,484 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:57,484 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1696612971] [2020-07-21 01:47:57,484 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:57,523 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:57,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:57,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 01:47:57,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:57,604 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:47:57,605 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:57,674 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:47:57,675 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1696612971] [2020-07-21 01:47:57,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:57,675 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 01:47:57,675 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998656746] [2020-07-21 01:47:57,676 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 01:47:57,676 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:57,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 01:47:57,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-07-21 01:47:57,677 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 10 states. [2020-07-21 01:47:57,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:57,906 INFO L93 Difference]: Finished difference Result 65 states and 77 transitions. [2020-07-21 01:47:57,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 01:47:57,907 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-07-21 01:47:57,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:57,910 INFO L225 Difference]: With dead ends: 65 [2020-07-21 01:47:57,911 INFO L226 Difference]: Without dead ends: 46 [2020-07-21 01:47:57,912 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=65, Invalid=145, Unknown=0, NotChecked=0, Total=210 [2020-07-21 01:47:57,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-07-21 01:47:57,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 41. [2020-07-21 01:47:57,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 01:47:57,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 48 transitions. [2020-07-21 01:47:57,924 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 48 transitions. Word has length 28 [2020-07-21 01:47:57,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:57,926 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 48 transitions. [2020-07-21 01:47:57,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 01:47:57,926 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 48 transitions. [2020-07-21 01:47:57,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-21 01:47:57,928 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:57,928 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:58,138 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:58,139 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:58,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:58,140 INFO L82 PathProgramCache]: Analyzing trace with hash 848296232, now seen corresponding path program 1 times [2020-07-21 01:47:58,141 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:58,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [562243325] [2020-07-21 01:47:58,142 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:58,172 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 01:47:58,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:58,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 01:47:58,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:58,231 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 01:47:58,231 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:47:58,231 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [562243325] [2020-07-21 01:47:58,232 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:47:58,232 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 01:47:58,232 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434949601] [2020-07-21 01:47:58,233 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 01:47:58,233 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:58,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 01:47:58,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-07-21 01:47:58,234 INFO L87 Difference]: Start difference. First operand 41 states and 48 transitions. Second operand 6 states. [2020-07-21 01:47:58,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:58,297 INFO L93 Difference]: Finished difference Result 68 states and 81 transitions. [2020-07-21 01:47:58,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 01:47:58,297 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 34 [2020-07-21 01:47:58,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:58,299 INFO L225 Difference]: With dead ends: 68 [2020-07-21 01:47:58,299 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 01:47:58,299 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-07-21 01:47:58,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 01:47:58,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 41. [2020-07-21 01:47:58,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 01:47:58,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 46 transitions. [2020-07-21 01:47:58,308 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 46 transitions. Word has length 34 [2020-07-21 01:47:58,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:58,309 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 46 transitions. [2020-07-21 01:47:58,309 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 01:47:58,309 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 46 transitions. [2020-07-21 01:47:58,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 01:47:58,310 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:58,311 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:58,525 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:58,526 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:58,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:58,527 INFO L82 PathProgramCache]: Analyzing trace with hash -670641491, now seen corresponding path program 2 times [2020-07-21 01:47:58,528 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:58,528 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [297004340] [2020-07-21 01:47:58,529 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 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:58,571 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:58,571 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:58,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 01:47:58,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:58,647 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:47:58,649 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:47:58,670 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 20 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 01:47:58,671 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:58,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:47:58,757 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 10 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 01:47:58,757 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [297004340] [2020-07-21 01:47:58,758 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:58,758 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 15 [2020-07-21 01:47:58,758 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715844834] [2020-07-21 01:47:58,759 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 01:47:58,759 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:58,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 01:47:58,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=147, Unknown=0, NotChecked=0, Total=210 [2020-07-21 01:47:58,760 INFO L87 Difference]: Start difference. First operand 41 states and 46 transitions. Second operand 15 states. [2020-07-21 01:47:59,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:59,105 INFO L93 Difference]: Finished difference Result 78 states and 94 transitions. [2020-07-21 01:47:59,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 01:47:59,106 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 41 [2020-07-21 01:47:59,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:59,110 INFO L225 Difference]: With dead ends: 78 [2020-07-21 01:47:59,111 INFO L226 Difference]: Without dead ends: 76 [2020-07-21 01:47:59,112 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 65 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=179, Invalid=373, Unknown=0, NotChecked=0, Total=552 [2020-07-21 01:47:59,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-21 01:47:59,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 54. [2020-07-21 01:47:59,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-21 01:47:59,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 64 transitions. [2020-07-21 01:47:59,135 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 64 transitions. Word has length 41 [2020-07-21 01:47:59,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:59,136 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 64 transitions. [2020-07-21 01:47:59,136 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 01:47:59,136 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 64 transitions. [2020-07-21 01:47:59,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-07-21 01:47:59,139 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:59,139 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:59,340 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:59,341 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:59,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:59,342 INFO L82 PathProgramCache]: Analyzing trace with hash 1941695900, now seen corresponding path program 3 times [2020-07-21 01:47:59,343 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:59,343 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [169659482] [2020-07-21 01:47:59,344 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 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:59,379 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:47:59,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:59,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 01:47:59,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:59,473 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 60 proven. 19 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2020-07-21 01:47:59,473 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:47:59,559 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 40 proven. 19 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2020-07-21 01:47:59,560 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [169659482] [2020-07-21 01:47:59,561 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:47:59,561 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 13 [2020-07-21 01:47:59,561 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [207913340] [2020-07-21 01:47:59,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 01:47:59,562 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:59,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 01:47:59,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2020-07-21 01:47:59,568 INFO L87 Difference]: Start difference. First operand 54 states and 64 transitions. Second operand 13 states. [2020-07-21 01:47:59,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:59,973 INFO L93 Difference]: Finished difference Result 127 states and 164 transitions. [2020-07-21 01:47:59,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 01:47:59,974 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 62 [2020-07-21 01:47:59,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:59,976 INFO L225 Difference]: With dead ends: 127 [2020-07-21 01:47:59,976 INFO L226 Difference]: Without dead ends: 95 [2020-07-21 01:47:59,979 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 109 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=169, Invalid=431, Unknown=0, NotChecked=0, Total=600 [2020-07-21 01:47:59,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-07-21 01:48:00,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 64. [2020-07-21 01:48:00,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-21 01:48:00,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 78 transitions. [2020-07-21 01:48:00,004 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 78 transitions. Word has length 62 [2020-07-21 01:48:00,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:00,005 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 78 transitions. [2020-07-21 01:48:00,005 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 01:48:00,005 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 78 transitions. [2020-07-21 01:48:00,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-07-21 01:48:00,010 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:00,010 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 6, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:00,225 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:00,226 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:00,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:00,227 INFO L82 PathProgramCache]: Analyzing trace with hash 1583260034, now seen corresponding path program 4 times [2020-07-21 01:48:00,228 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:00,228 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [704344018] [2020-07-21 01:48:00,228 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:00,267 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:48:00,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:00,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 01:48:00,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:00,361 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 88 proven. 7 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-07-21 01:48:00,361 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:00,430 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 61 proven. 10 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-21 01:48:00,431 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [704344018] [2020-07-21 01:48:00,431 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:00,431 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2020-07-21 01:48:00,431 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [223073606] [2020-07-21 01:48:00,432 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 01:48:00,432 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:00,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 01:48:00,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2020-07-21 01:48:00,433 INFO L87 Difference]: Start difference. First operand 64 states and 78 transitions. Second operand 11 states. [2020-07-21 01:48:00,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:00,603 INFO L93 Difference]: Finished difference Result 123 states and 153 transitions. [2020-07-21 01:48:00,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 01:48:00,604 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 72 [2020-07-21 01:48:00,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:00,608 INFO L225 Difference]: With dead ends: 123 [2020-07-21 01:48:00,608 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 01:48:00,610 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 131 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2020-07-21 01:48:00,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 01:48:00,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-07-21 01:48:00,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-21 01:48:00,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 74 transitions. [2020-07-21 01:48:00,633 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 74 transitions. Word has length 72 [2020-07-21 01:48:00,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:00,634 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 74 transitions. [2020-07-21 01:48:00,634 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 01:48:00,634 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 74 transitions. [2020-07-21 01:48:00,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-07-21 01:48:00,635 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:00,635 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:00,836 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:00,836 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:00,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:00,837 INFO L82 PathProgramCache]: Analyzing trace with hash 1833574291, now seen corresponding path program 5 times [2020-07-21 01:48:00,837 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:00,837 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [854786468] [2020-07-21 01:48:00,837 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:00,885 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:00,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:00,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 01:48:00,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:01,023 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 75 proven. 62 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2020-07-21 01:48:01,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:01,144 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 53 proven. 62 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2020-07-21 01:48:01,145 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [854786468] [2020-07-21 01:48:01,146 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:01,146 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2020-07-21 01:48:01,146 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [301380122] [2020-07-21 01:48:01,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 01:48:01,147 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:01,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 01:48:01,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 01:48:01,149 INFO L87 Difference]: Start difference. First operand 64 states and 74 transitions. Second operand 17 states. [2020-07-21 01:48:01,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:01,783 INFO L93 Difference]: Finished difference Result 132 states and 162 transitions. [2020-07-21 01:48:01,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-21 01:48:01,783 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 79 [2020-07-21 01:48:01,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:01,785 INFO L225 Difference]: With dead ends: 132 [2020-07-21 01:48:01,785 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 01:48:01,786 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 139 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=307, Invalid=815, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 01:48:01,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 01:48:01,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 78. [2020-07-21 01:48:01,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-07-21 01:48:01,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 94 transitions. [2020-07-21 01:48:01,800 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 94 transitions. Word has length 79 [2020-07-21 01:48:01,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:01,801 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 94 transitions. [2020-07-21 01:48:01,801 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 01:48:01,801 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 94 transitions. [2020-07-21 01:48:01,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-07-21 01:48:01,802 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:01,803 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:02,015 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:02,016 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:02,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:02,017 INFO L82 PathProgramCache]: Analyzing trace with hash -832577267, now seen corresponding path program 6 times [2020-07-21 01:48:02,017 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:02,018 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1123312471] [2020-07-21 01:48:02,018 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:02,059 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:48:02,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:02,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 01:48:02,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:02,170 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 216 proven. 32 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2020-07-21 01:48:02,171 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:02,291 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 127 proven. 49 refuted. 0 times theorem prover too weak. 178 trivial. 0 not checked. [2020-07-21 01:48:02,292 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1123312471] [2020-07-21 01:48:02,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:02,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 15 [2020-07-21 01:48:02,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667854753] [2020-07-21 01:48:02,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 01:48:02,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:02,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 01:48:02,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2020-07-21 01:48:02,294 INFO L87 Difference]: Start difference. First operand 78 states and 94 transitions. Second operand 15 states. [2020-07-21 01:48:02,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:02,658 INFO L93 Difference]: Finished difference Result 140 states and 176 transitions. [2020-07-21 01:48:02,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 01:48:02,659 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 99 [2020-07-21 01:48:02,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:02,660 INFO L225 Difference]: With dead ends: 140 [2020-07-21 01:48:02,660 INFO L226 Difference]: Without dead ends: 96 [2020-07-21 01:48:02,661 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 181 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=171, Invalid=381, Unknown=0, NotChecked=0, Total=552 [2020-07-21 01:48:02,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-07-21 01:48:02,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 86. [2020-07-21 01:48:02,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-07-21 01:48:02,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 104 transitions. [2020-07-21 01:48:02,676 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 104 transitions. Word has length 99 [2020-07-21 01:48:02,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:02,677 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 104 transitions. [2020-07-21 01:48:02,677 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 01:48:02,677 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 104 transitions. [2020-07-21 01:48:02,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-21 01:48:02,678 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:02,679 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 10, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:02,891 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:02,892 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:02,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:02,892 INFO L82 PathProgramCache]: Analyzing trace with hash -1419871984, now seen corresponding path program 7 times [2020-07-21 01:48:02,892 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:02,893 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1160585141] [2020-07-21 01:48:02,893 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:02,952 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:02,952 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:02,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 01:48:02,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:03,056 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 106 proven. 124 refuted. 0 times theorem prover too weak. 194 trivial. 0 not checked. [2020-07-21 01:48:03,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:03,170 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 72 proven. 124 refuted. 0 times theorem prover too weak. 228 trivial. 0 not checked. [2020-07-21 01:48:03,170 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1160585141] [2020-07-21 01:48:03,170 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:03,170 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2020-07-21 01:48:03,171 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214257513] [2020-07-21 01:48:03,171 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 01:48:03,171 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:03,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 01:48:03,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2020-07-21 01:48:03,172 INFO L87 Difference]: Start difference. First operand 86 states and 104 transitions. Second operand 16 states. [2020-07-21 01:48:03,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:03,985 INFO L93 Difference]: Finished difference Result 169 states and 212 transitions. [2020-07-21 01:48:03,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-21 01:48:03,988 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 106 [2020-07-21 01:48:03,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:03,990 INFO L225 Difference]: With dead ends: 169 [2020-07-21 01:48:03,990 INFO L226 Difference]: Without dead ends: 122 [2020-07-21 01:48:03,993 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 193 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 395 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=395, Invalid=1165, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 01:48:03,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-07-21 01:48:04,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 99. [2020-07-21 01:48:04,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-07-21 01:48:04,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 121 transitions. [2020-07-21 01:48:04,025 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 121 transitions. Word has length 106 [2020-07-21 01:48:04,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:04,026 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 121 transitions. [2020-07-21 01:48:04,026 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 01:48:04,026 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 121 transitions. [2020-07-21 01:48:04,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-07-21 01:48:04,028 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:04,028 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 12, 12, 12, 12, 5, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:04,241 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:04,241 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:04,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:04,242 INFO L82 PathProgramCache]: Analyzing trace with hash 1976134303, now seen corresponding path program 8 times [2020-07-21 01:48:04,242 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:04,243 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1038493719] [2020-07-21 01:48:04,243 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:04,298 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:48:04,298 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:04,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 01:48:04,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:04,414 INFO L134 CoverageAnalysis]: Checked inductivity of 611 backedges. 338 proven. 56 refuted. 0 times theorem prover too weak. 217 trivial. 0 not checked. [2020-07-21 01:48:04,414 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:04,542 INFO L134 CoverageAnalysis]: Checked inductivity of 611 backedges. 212 proven. 62 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2020-07-21 01:48:04,542 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1038493719] [2020-07-21 01:48:04,542 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:04,543 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2020-07-21 01:48:04,543 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947713996] [2020-07-21 01:48:04,543 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 01:48:04,544 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:04,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 01:48:04,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2020-07-21 01:48:04,544 INFO L87 Difference]: Start difference. First operand 99 states and 121 transitions. Second operand 14 states. [2020-07-21 01:48:04,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:04,835 INFO L93 Difference]: Finished difference Result 186 states and 230 transitions. [2020-07-21 01:48:04,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 01:48:04,838 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 123 [2020-07-21 01:48:04,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:04,839 INFO L225 Difference]: With dead ends: 186 [2020-07-21 01:48:04,839 INFO L226 Difference]: Without dead ends: 99 [2020-07-21 01:48:04,840 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 229 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=130, Invalid=290, Unknown=0, NotChecked=0, Total=420 [2020-07-21 01:48:04,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-07-21 01:48:04,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 91. [2020-07-21 01:48:04,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-07-21 01:48:04,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 107 transitions. [2020-07-21 01:48:04,852 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 107 transitions. Word has length 123 [2020-07-21 01:48:04,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:04,853 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 107 transitions. [2020-07-21 01:48:04,853 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 01:48:04,853 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 107 transitions. [2020-07-21 01:48:04,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2020-07-21 01:48:04,854 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:04,855 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 5, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:05,068 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:05,069 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:05,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:05,069 INFO L82 PathProgramCache]: Analyzing trace with hash -1688384554, now seen corresponding path program 9 times [2020-07-21 01:48:05,069 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:05,070 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [889020835] [2020-07-21 01:48:05,070 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:05,120 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:05,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:05,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 01:48:05,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:05,299 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 61 proven. 271 refuted. 0 times theorem prover too weak. 371 trivial. 0 not checked. [2020-07-21 01:48:05,299 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:05,467 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 61 proven. 271 refuted. 0 times theorem prover too weak. 371 trivial. 0 not checked. [2020-07-21 01:48:05,467 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [889020835] [2020-07-21 01:48:05,468 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:05,468 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 20 [2020-07-21 01:48:05,468 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244435806] [2020-07-21 01:48:05,469 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 01:48:05,469 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:05,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 01:48:05,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=295, Unknown=0, NotChecked=0, Total=380 [2020-07-21 01:48:05,469 INFO L87 Difference]: Start difference. First operand 91 states and 107 transitions. Second operand 20 states. [2020-07-21 01:48:06,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:06,649 INFO L93 Difference]: Finished difference Result 177 states and 219 transitions. [2020-07-21 01:48:06,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 01:48:06,649 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 130 [2020-07-21 01:48:06,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:06,651 INFO L225 Difference]: With dead ends: 177 [2020-07-21 01:48:06,651 INFO L226 Difference]: Without dead ends: 128 [2020-07-21 01:48:06,653 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 237 SyntacticMatches, 4 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 676 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=634, Invalid=1916, Unknown=0, NotChecked=0, Total=2550 [2020-07-21 01:48:06,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-21 01:48:06,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 106. [2020-07-21 01:48:06,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-07-21 01:48:06,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 127 transitions. [2020-07-21 01:48:06,673 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 127 transitions. Word has length 130 [2020-07-21 01:48:06,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:06,674 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 127 transitions. [2020-07-21 01:48:06,674 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 01:48:06,674 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 127 transitions. [2020-07-21 01:48:06,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2020-07-21 01:48:06,675 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:06,676 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 17, 16, 16, 16, 16, 6, 5, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:06,878 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:06,879 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:06,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:06,880 INFO L82 PathProgramCache]: Analyzing trace with hash -840848228, now seen corresponding path program 10 times [2020-07-21 01:48:06,880 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:06,881 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [600322979] [2020-07-21 01:48:06,881 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:06,938 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:06,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:06,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 01:48:06,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:07,098 INFO L134 CoverageAnalysis]: Checked inductivity of 1054 backedges. 555 proven. 118 refuted. 0 times theorem prover too weak. 381 trivial. 0 not checked. [2020-07-21 01:48:07,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:07,299 INFO L134 CoverageAnalysis]: Checked inductivity of 1054 backedges. 284 proven. 205 refuted. 0 times theorem prover too weak. 565 trivial. 0 not checked. [2020-07-21 01:48:07,301 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [600322979] [2020-07-21 01:48:07,301 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:07,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 18 [2020-07-21 01:48:07,302 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438741596] [2020-07-21 01:48:07,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 01:48:07,303 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:07,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 01:48:07,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=232, Unknown=0, NotChecked=0, Total=306 [2020-07-21 01:48:07,303 INFO L87 Difference]: Start difference. First operand 106 states and 127 transitions. Second operand 18 states. [2020-07-21 01:48:07,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:07,751 INFO L93 Difference]: Finished difference Result 155 states and 189 transitions. [2020-07-21 01:48:07,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 01:48:07,752 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 154 [2020-07-21 01:48:07,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:07,753 INFO L225 Difference]: With dead ends: 155 [2020-07-21 01:48:07,754 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 01:48:07,756 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 287 SyntacticMatches, 4 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=256, Invalid=614, Unknown=0, NotChecked=0, Total=870 [2020-07-21 01:48:07,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 01:48:07,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 117. [2020-07-21 01:48:07,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-07-21 01:48:07,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 141 transitions. [2020-07-21 01:48:07,773 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 141 transitions. Word has length 154 [2020-07-21 01:48:07,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:07,774 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 141 transitions. [2020-07-21 01:48:07,774 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 01:48:07,774 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 141 transitions. [2020-07-21 01:48:07,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2020-07-21 01:48:07,776 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:07,776 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 17, 17, 17, 17, 6, 5, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:07,988 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:07,989 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:07,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:07,990 INFO L82 PathProgramCache]: Analyzing trace with hash 1311982393, now seen corresponding path program 11 times [2020-07-21 01:48:07,990 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:07,990 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1773117713] [2020-07-21 01:48:07,991 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:08,048 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:08,048 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:08,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 01:48:08,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:08,165 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:48:08,166 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:48:08,208 INFO L134 CoverageAnalysis]: Checked inductivity of 1175 backedges. 476 proven. 26 refuted. 0 times theorem prover too weak. 673 trivial. 0 not checked. [2020-07-21 01:48:08,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:08,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:48:08,411 INFO L134 CoverageAnalysis]: Checked inductivity of 1175 backedges. 80 proven. 422 refuted. 0 times theorem prover too weak. 673 trivial. 0 not checked. [2020-07-21 01:48:08,411 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1773117713] [2020-07-21 01:48:08,411 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:08,411 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 22 [2020-07-21 01:48:08,412 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451457310] [2020-07-21 01:48:08,412 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 01:48:08,412 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:08,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 01:48:08,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=314, Unknown=0, NotChecked=0, Total=462 [2020-07-21 01:48:08,413 INFO L87 Difference]: Start difference. First operand 117 states and 141 transitions. Second operand 22 states. [2020-07-21 01:48:09,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:09,001 INFO L93 Difference]: Finished difference Result 166 states and 209 transitions. [2020-07-21 01:48:09,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-21 01:48:09,002 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 161 [2020-07-21 01:48:09,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:09,004 INFO L225 Difference]: With dead ends: 166 [2020-07-21 01:48:09,004 INFO L226 Difference]: Without dead ends: 164 [2020-07-21 01:48:09,005 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 297 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 421 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=526, Invalid=1034, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 01:48:09,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2020-07-21 01:48:09,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 136. [2020-07-21 01:48:09,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-07-21 01:48:09,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 169 transitions. [2020-07-21 01:48:09,024 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 169 transitions. Word has length 161 [2020-07-21 01:48:09,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:09,025 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 169 transitions. [2020-07-21 01:48:09,025 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 01:48:09,025 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 169 transitions. [2020-07-21 01:48:09,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2020-07-21 01:48:09,027 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:09,028 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 23, 22, 22, 22, 22, 6, 5, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:09,241 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:09,242 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:09,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:09,243 INFO L82 PathProgramCache]: Analyzing trace with hash -90659728, now seen corresponding path program 12 times [2020-07-21 01:48:09,243 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:09,244 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1275330864] [2020-07-21 01:48:09,244 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:09,307 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:09,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:09,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 01:48:09,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:09,533 INFO L134 CoverageAnalysis]: Checked inductivity of 1885 backedges. 617 proven. 521 refuted. 0 times theorem prover too weak. 747 trivial. 0 not checked. [2020-07-21 01:48:09,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:09,767 INFO L134 CoverageAnalysis]: Checked inductivity of 1885 backedges. 337 proven. 521 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2020-07-21 01:48:09,767 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1275330864] [2020-07-21 01:48:09,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:09,768 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 24 [2020-07-21 01:48:09,768 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644724032] [2020-07-21 01:48:09,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 01:48:09,769 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:09,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 01:48:09,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=435, Unknown=0, NotChecked=0, Total=552 [2020-07-21 01:48:09,769 INFO L87 Difference]: Start difference. First operand 136 states and 169 transitions. Second operand 24 states. [2020-07-21 01:48:11,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:11,228 INFO L93 Difference]: Finished difference Result 267 states and 343 transitions. [2020-07-21 01:48:11,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-21 01:48:11,229 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 196 [2020-07-21 01:48:11,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:11,231 INFO L225 Difference]: With dead ends: 267 [2020-07-21 01:48:11,231 INFO L226 Difference]: Without dead ends: 188 [2020-07-21 01:48:11,232 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 427 GetRequests, 365 SyntacticMatches, 4 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 982 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=931, Invalid=2609, Unknown=0, NotChecked=0, Total=3540 [2020-07-21 01:48:11,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2020-07-21 01:48:11,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 156. [2020-07-21 01:48:11,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2020-07-21 01:48:11,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 197 transitions. [2020-07-21 01:48:11,252 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 197 transitions. Word has length 196 [2020-07-21 01:48:11,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:11,253 INFO L479 AbstractCegarLoop]: Abstraction has 156 states and 197 transitions. [2020-07-21 01:48:11,253 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 01:48:11,253 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 197 transitions. [2020-07-21 01:48:11,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2020-07-21 01:48:11,255 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:11,255 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 27, 26, 26, 26, 26, 7, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:11,462 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:11,463 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:11,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:11,464 INFO L82 PathProgramCache]: Analyzing trace with hash -1782452330, now seen corresponding path program 13 times [2020-07-21 01:48:11,464 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:11,465 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [831613177] [2020-07-21 01:48:11,465 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:11,526 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:48:11,527 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:11,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 326 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 01:48:11,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:11,730 INFO L134 CoverageAnalysis]: Checked inductivity of 2642 backedges. 1512 proven. 216 refuted. 0 times theorem prover too weak. 914 trivial. 0 not checked. [2020-07-21 01:48:11,731 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:11,967 INFO L134 CoverageAnalysis]: Checked inductivity of 2642 backedges. 729 proven. 405 refuted. 0 times theorem prover too weak. 1508 trivial. 0 not checked. [2020-07-21 01:48:11,967 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [831613177] [2020-07-21 01:48:11,968 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:11,968 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 22 [2020-07-21 01:48:11,968 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727272480] [2020-07-21 01:48:11,969 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 01:48:11,969 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:11,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 01:48:11,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=356, Unknown=0, NotChecked=0, Total=462 [2020-07-21 01:48:11,970 INFO L87 Difference]: Start difference. First operand 156 states and 197 transitions. Second operand 22 states. [2020-07-21 01:48:12,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:12,680 INFO L93 Difference]: Finished difference Result 289 states and 385 transitions. [2020-07-21 01:48:12,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 01:48:12,681 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 230 [2020-07-21 01:48:12,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:12,683 INFO L225 Difference]: With dead ends: 289 [2020-07-21 01:48:12,683 INFO L226 Difference]: Without dead ends: 209 [2020-07-21 01:48:12,685 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 477 GetRequests, 435 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 298 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=453, Invalid=1107, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 01:48:12,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-07-21 01:48:12,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 190. [2020-07-21 01:48:12,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-21 01:48:12,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 248 transitions. [2020-07-21 01:48:12,711 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 248 transitions. Word has length 230 [2020-07-21 01:48:12,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:12,712 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 248 transitions. [2020-07-21 01:48:12,712 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 01:48:12,712 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 248 transitions. [2020-07-21 01:48:12,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2020-07-21 01:48:12,714 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:12,714 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 27, 27, 27, 27, 7, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:12,928 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:12,929 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:12,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:12,930 INFO L82 PathProgramCache]: Analyzing trace with hash -1051553665, now seen corresponding path program 14 times [2020-07-21 01:48:12,930 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:12,931 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1706602826] [2020-07-21 01:48:12,931 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:13,015 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:13,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:13,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 435 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 01:48:13,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:13,170 INFO L134 CoverageAnalysis]: Checked inductivity of 2834 backedges. 893 proven. 639 refuted. 0 times theorem prover too weak. 1302 trivial. 0 not checked. [2020-07-21 01:48:13,171 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:13,385 INFO L134 CoverageAnalysis]: Checked inductivity of 2834 backedges. 463 proven. 639 refuted. 0 times theorem prover too weak. 1732 trivial. 0 not checked. [2020-07-21 01:48:13,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1706602826] [2020-07-21 01:48:13,386 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:13,386 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 19 [2020-07-21 01:48:13,386 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006876870] [2020-07-21 01:48:13,387 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 01:48:13,387 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:13,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 01:48:13,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=260, Unknown=0, NotChecked=0, Total=342 [2020-07-21 01:48:13,388 INFO L87 Difference]: Start difference. First operand 190 states and 248 transitions. Second operand 19 states. [2020-07-21 01:48:14,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:14,587 INFO L93 Difference]: Finished difference Result 456 states and 609 transitions. [2020-07-21 01:48:14,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-07-21 01:48:14,595 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 237 [2020-07-21 01:48:14,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:14,599 INFO L225 Difference]: With dead ends: 456 [2020-07-21 01:48:14,600 INFO L226 Difference]: Without dead ends: 353 [2020-07-21 01:48:14,602 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 510 GetRequests, 451 SyntacticMatches, 5 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 908 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=720, Invalid=2360, Unknown=0, NotChecked=0, Total=3080 [2020-07-21 01:48:14,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2020-07-21 01:48:14,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 254. [2020-07-21 01:48:14,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2020-07-21 01:48:14,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 331 transitions. [2020-07-21 01:48:14,647 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 331 transitions. Word has length 237 [2020-07-21 01:48:14,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:14,648 INFO L479 AbstractCegarLoop]: Abstraction has 254 states and 331 transitions. [2020-07-21 01:48:14,648 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 01:48:14,648 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 331 transitions. [2020-07-21 01:48:14,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2020-07-21 01:48:14,654 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:14,654 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 31, 30, 30, 30, 30, 8, 7, 7, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:14,863 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:14,864 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:14,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:14,865 INFO L82 PathProgramCache]: Analyzing trace with hash 1090659833, now seen corresponding path program 15 times [2020-07-21 01:48:14,865 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:14,866 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [388145446] [2020-07-21 01:48:14,866 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:14,935 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:48:14,935 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:14,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 01:48:14,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:15,096 INFO L134 CoverageAnalysis]: Checked inductivity of 3506 backedges. 1869 proven. 216 refuted. 0 times theorem prover too weak. 1421 trivial. 0 not checked. [2020-07-21 01:48:15,097 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:15,293 INFO L134 CoverageAnalysis]: Checked inductivity of 3506 backedges. 1121 proven. 226 refuted. 0 times theorem prover too weak. 2159 trivial. 0 not checked. [2020-07-21 01:48:15,294 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [388145446] [2020-07-21 01:48:15,294 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:15,294 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 17 [2020-07-21 01:48:15,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1938160904] [2020-07-21 01:48:15,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 01:48:15,295 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:15,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 01:48:15,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=203, Unknown=0, NotChecked=0, Total=272 [2020-07-21 01:48:15,296 INFO L87 Difference]: Start difference. First operand 254 states and 331 transitions. Second operand 17 states. [2020-07-21 01:48:15,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:15,706 INFO L93 Difference]: Finished difference Result 363 states and 479 transitions. [2020-07-21 01:48:15,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 01:48:15,707 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 261 [2020-07-21 01:48:15,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:15,709 INFO L225 Difference]: With dead ends: 363 [2020-07-21 01:48:15,709 INFO L226 Difference]: Without dead ends: 206 [2020-07-21 01:48:15,710 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 531 GetRequests, 501 SyntacticMatches, 5 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=207, Invalid=495, Unknown=0, NotChecked=0, Total=702 [2020-07-21 01:48:15,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2020-07-21 01:48:15,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 206. [2020-07-21 01:48:15,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2020-07-21 01:48:15,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 266 transitions. [2020-07-21 01:48:15,743 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 266 transitions. Word has length 261 [2020-07-21 01:48:15,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:15,744 INFO L479 AbstractCegarLoop]: Abstraction has 206 states and 266 transitions. [2020-07-21 01:48:15,744 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 01:48:15,744 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 266 transitions. [2020-07-21 01:48:15,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2020-07-21 01:48:15,747 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:15,748 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 31, 31, 31, 31, 8, 7, 7, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:15,961 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:15,961 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:15,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:15,961 INFO L82 PathProgramCache]: Analyzing trace with hash -431748828, now seen corresponding path program 16 times [2020-07-21 01:48:15,961 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:15,962 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [182391168] [2020-07-21 01:48:15,962 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:16,040 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:16,041 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:16,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 489 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 01:48:16,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:16,280 INFO L134 CoverageAnalysis]: Checked inductivity of 3727 backedges. 904 proven. 1050 refuted. 0 times theorem prover too weak. 1773 trivial. 0 not checked. [2020-07-21 01:48:16,280 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:16,542 INFO L134 CoverageAnalysis]: Checked inductivity of 3727 backedges. 480 proven. 1050 refuted. 0 times theorem prover too weak. 2197 trivial. 0 not checked. [2020-07-21 01:48:16,542 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [182391168] [2020-07-21 01:48:16,542 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:16,542 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 23 [2020-07-21 01:48:16,543 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930534846] [2020-07-21 01:48:16,543 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 01:48:16,543 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:16,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 01:48:16,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=395, Unknown=0, NotChecked=0, Total=506 [2020-07-21 01:48:16,544 INFO L87 Difference]: Start difference. First operand 206 states and 266 transitions. Second operand 23 states. [2020-07-21 01:48:18,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:18,726 INFO L93 Difference]: Finished difference Result 373 states and 497 transitions. [2020-07-21 01:48:18,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-07-21 01:48:18,726 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 268 [2020-07-21 01:48:18,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:18,730 INFO L225 Difference]: With dead ends: 373 [2020-07-21 01:48:18,730 INFO L226 Difference]: Without dead ends: 260 [2020-07-21 01:48:18,733 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 588 GetRequests, 509 SyntacticMatches, 5 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1812 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1346, Invalid=4354, Unknown=0, NotChecked=0, Total=5700 [2020-07-21 01:48:18,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2020-07-21 01:48:18,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 224. [2020-07-21 01:48:18,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2020-07-21 01:48:18,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 290 transitions. [2020-07-21 01:48:18,772 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 290 transitions. Word has length 268 [2020-07-21 01:48:18,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:18,773 INFO L479 AbstractCegarLoop]: Abstraction has 224 states and 290 transitions. [2020-07-21 01:48:18,773 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 01:48:18,773 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 290 transitions. [2020-07-21 01:48:18,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-21 01:48:18,776 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:18,777 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 35, 35, 35, 35, 9, 8, 8, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:18,990 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:18,991 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:18,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:18,992 INFO L82 PathProgramCache]: Analyzing trace with hash -935543841, now seen corresponding path program 17 times [2020-07-21 01:48:18,992 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:18,993 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [413971553] [2020-07-21 01:48:18,993 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:19,094 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:19,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:19,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 543 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 01:48:19,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:19,328 INFO L134 CoverageAnalysis]: Checked inductivity of 4743 backedges. 2497 proven. 343 refuted. 0 times theorem prover too weak. 1903 trivial. 0 not checked. [2020-07-21 01:48:19,329 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:19,832 INFO L134 CoverageAnalysis]: Checked inductivity of 4743 backedges. 1289 proven. 633 refuted. 0 times theorem prover too weak. 2821 trivial. 0 not checked. [2020-07-21 01:48:19,832 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [413971553] [2020-07-21 01:48:19,833 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:19,833 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 21 [2020-07-21 01:48:19,833 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129537939] [2020-07-21 01:48:19,835 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 01:48:19,835 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:19,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 01:48:19,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=321, Unknown=0, NotChecked=0, Total=420 [2020-07-21 01:48:19,836 INFO L87 Difference]: Start difference. First operand 224 states and 290 transitions. Second operand 21 states. [2020-07-21 01:48:20,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:20,515 INFO L93 Difference]: Finished difference Result 320 states and 421 transitions. [2020-07-21 01:48:20,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 01:48:20,516 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 299 [2020-07-21 01:48:20,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:20,521 INFO L225 Difference]: With dead ends: 320 [2020-07-21 01:48:20,521 INFO L226 Difference]: Without dead ends: 224 [2020-07-21 01:48:20,522 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 613 GetRequests, 573 SyntacticMatches, 5 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=384, Invalid=948, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 01:48:20,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2020-07-21 01:48:20,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 193. [2020-07-21 01:48:20,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 193 states. [2020-07-21 01:48:20,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 241 transitions. [2020-07-21 01:48:20,551 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 241 transitions. Word has length 299 [2020-07-21 01:48:20,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:20,552 INFO L479 AbstractCegarLoop]: Abstraction has 193 states and 241 transitions. [2020-07-21 01:48:20,552 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 01:48:20,552 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 241 transitions. [2020-07-21 01:48:20,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2020-07-21 01:48:20,554 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:20,554 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 37, 36, 36, 36, 36, 9, 8, 8, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:20,768 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:20,769 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:20,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:20,770 INFO L82 PathProgramCache]: Analyzing trace with hash 221652094, now seen corresponding path program 18 times [2020-07-21 01:48:20,770 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:20,770 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [606621766] [2020-07-21 01:48:20,771 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:20,928 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:20,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:20,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 555 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 01:48:20,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:21,294 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 870 proven. 1638 refuted. 0 times theorem prover too weak. 2492 trivial. 0 not checked. [2020-07-21 01:48:21,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:21,704 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 480 proven. 1638 refuted. 0 times theorem prover too weak. 2882 trivial. 0 not checked. [2020-07-21 01:48:21,704 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [606621766] [2020-07-21 01:48:21,704 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:21,705 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 27 [2020-07-21 01:48:21,705 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722675090] [2020-07-21 01:48:21,706 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 01:48:21,706 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:21,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 01:48:21,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=556, Unknown=0, NotChecked=0, Total=702 [2020-07-21 01:48:21,707 INFO L87 Difference]: Start difference. First operand 193 states and 241 transitions. Second operand 27 states. [2020-07-21 01:48:24,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:24,383 INFO L93 Difference]: Finished difference Result 335 states and 432 transitions. [2020-07-21 01:48:24,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2020-07-21 01:48:24,384 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 306 [2020-07-21 01:48:24,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:24,386 INFO L225 Difference]: With dead ends: 335 [2020-07-21 01:48:24,386 INFO L226 Difference]: Without dead ends: 250 [2020-07-21 01:48:24,388 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 669 GetRequests, 581 SyntacticMatches, 5 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2259 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1692, Invalid=5448, Unknown=0, NotChecked=0, Total=7140 [2020-07-21 01:48:24,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-07-21 01:48:24,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 214. [2020-07-21 01:48:24,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2020-07-21 01:48:24,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 269 transitions. [2020-07-21 01:48:24,420 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 269 transitions. Word has length 306 [2020-07-21 01:48:24,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:24,421 INFO L479 AbstractCegarLoop]: Abstraction has 214 states and 269 transitions. [2020-07-21 01:48:24,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 01:48:24,421 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 269 transitions. [2020-07-21 01:48:24,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2020-07-21 01:48:24,423 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:24,423 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 41, 41, 41, 41, 10, 9, 9, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:24,636 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:24,637 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:24,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:24,638 INFO L82 PathProgramCache]: Analyzing trace with hash 856878168, now seen corresponding path program 19 times [2020-07-21 01:48:24,638 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:24,639 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [991943955] [2020-07-21 01:48:24,639 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:24,739 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:24,739 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:24,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 621 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 01:48:24,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:25,024 INFO L134 CoverageAnalysis]: Checked inductivity of 6461 backedges. 3324 proven. 515 refuted. 0 times theorem prover too weak. 2622 trivial. 0 not checked. [2020-07-21 01:48:25,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:25,430 INFO L134 CoverageAnalysis]: Checked inductivity of 6461 backedges. 1560 proven. 1145 refuted. 0 times theorem prover too weak. 3756 trivial. 0 not checked. [2020-07-21 01:48:25,430 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [991943955] [2020-07-21 01:48:25,430 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:25,430 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 25 [2020-07-21 01:48:25,430 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230607149] [2020-07-21 01:48:25,431 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 01:48:25,431 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:25,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 01:48:25,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=465, Unknown=0, NotChecked=0, Total=600 [2020-07-21 01:48:25,432 INFO L87 Difference]: Start difference. First operand 214 states and 269 transitions. Second operand 25 states. [2020-07-21 01:48:26,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:26,496 INFO L93 Difference]: Finished difference Result 327 states and 427 transitions. [2020-07-21 01:48:26,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 01:48:26,497 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 344 [2020-07-21 01:48:26,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:26,499 INFO L225 Difference]: With dead ends: 327 [2020-07-21 01:48:26,500 INFO L226 Difference]: Without dead ends: 262 [2020-07-21 01:48:26,502 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 710 GetRequests, 659 SyntacticMatches, 5 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 456 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=638, Invalid=1618, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 01:48:26,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2020-07-21 01:48:26,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 248. [2020-07-21 01:48:26,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2020-07-21 01:48:26,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 319 transitions. [2020-07-21 01:48:26,539 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 319 transitions. Word has length 344 [2020-07-21 01:48:26,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:26,540 INFO L479 AbstractCegarLoop]: Abstraction has 248 states and 319 transitions. [2020-07-21 01:48:26,540 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 01:48:26,540 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 319 transitions. [2020-07-21 01:48:26,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 352 [2020-07-21 01:48:26,543 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:26,543 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 43, 42, 42, 42, 42, 10, 9, 9, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:26,756 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:26,757 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:26,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:26,757 INFO L82 PathProgramCache]: Analyzing trace with hash 930621925, now seen corresponding path program 20 times [2020-07-21 01:48:26,757 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:26,757 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [253284957] [2020-07-21 01:48:26,758 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:26,863 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:26,863 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:26,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 633 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 01:48:26,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:27,226 INFO L134 CoverageAnalysis]: Checked inductivity of 6761 backedges. 770 proven. 2457 refuted. 0 times theorem prover too weak. 3534 trivial. 0 not checked. [2020-07-21 01:48:27,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:27,738 INFO L134 CoverageAnalysis]: Checked inductivity of 6761 backedges. 454 proven. 2457 refuted. 0 times theorem prover too weak. 3850 trivial. 0 not checked. [2020-07-21 01:48:27,739 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [253284957] [2020-07-21 01:48:27,739 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:27,739 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 31 [2020-07-21 01:48:27,739 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370487782] [2020-07-21 01:48:27,740 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 01:48:27,741 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:27,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 01:48:27,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=743, Unknown=0, NotChecked=0, Total=930 [2020-07-21 01:48:27,742 INFO L87 Difference]: Start difference. First operand 248 states and 319 transitions. Second operand 31 states. [2020-07-21 01:48:31,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:31,089 INFO L93 Difference]: Finished difference Result 462 states and 609 transitions. [2020-07-21 01:48:31,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2020-07-21 01:48:31,089 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 351 [2020-07-21 01:48:31,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:31,092 INFO L225 Difference]: With dead ends: 462 [2020-07-21 01:48:31,092 INFO L226 Difference]: Without dead ends: 333 [2020-07-21 01:48:31,094 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 770 GetRequests, 667 SyntacticMatches, 5 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3218 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2462, Invalid=7438, Unknown=0, NotChecked=0, Total=9900 [2020-07-21 01:48:31,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2020-07-21 01:48:31,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 274. [2020-07-21 01:48:31,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2020-07-21 01:48:31,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 355 transitions. [2020-07-21 01:48:31,137 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 355 transitions. Word has length 351 [2020-07-21 01:48:31,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:31,137 INFO L479 AbstractCegarLoop]: Abstraction has 274 states and 355 transitions. [2020-07-21 01:48:31,137 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 01:48:31,138 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 355 transitions. [2020-07-21 01:48:31,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 400 [2020-07-21 01:48:31,140 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:31,140 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 49, 48, 48, 48, 48, 11, 10, 10, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:31,354 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:31,355 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:31,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:31,355 INFO L82 PathProgramCache]: Analyzing trace with hash 1703194347, now seen corresponding path program 21 times [2020-07-21 01:48:31,355 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:31,355 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1667509439] [2020-07-21 01:48:31,356 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:31,467 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:31,468 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:31,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 717 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 01:48:31,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:31,809 INFO L134 CoverageAnalysis]: Checked inductivity of 8813 backedges. 4418 proven. 741 refuted. 0 times theorem prover too weak. 3654 trivial. 0 not checked. [2020-07-21 01:48:31,809 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:32,306 INFO L134 CoverageAnalysis]: Checked inductivity of 8813 backedges. 2002 proven. 1771 refuted. 0 times theorem prover too weak. 5040 trivial. 0 not checked. [2020-07-21 01:48:32,306 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1667509439] [2020-07-21 01:48:32,306 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:32,306 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 29 [2020-07-21 01:48:32,307 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894900618] [2020-07-21 01:48:32,307 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 01:48:32,308 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:32,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 01:48:32,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=635, Unknown=0, NotChecked=0, Total=812 [2020-07-21 01:48:32,308 INFO L87 Difference]: Start difference. First operand 274 states and 355 transitions. Second operand 29 states. [2020-07-21 01:48:33,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:33,667 INFO L93 Difference]: Finished difference Result 444 states and 593 transitions. [2020-07-21 01:48:33,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-21 01:48:33,667 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 399 [2020-07-21 01:48:33,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:33,670 INFO L225 Difference]: With dead ends: 444 [2020-07-21 01:48:33,670 INFO L226 Difference]: Without dead ends: 321 [2020-07-21 01:48:33,672 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 827 GetRequests, 765 SyntacticMatches, 5 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 704 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=969, Invalid=2453, Unknown=0, NotChecked=0, Total=3422 [2020-07-21 01:48:33,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2020-07-21 01:48:33,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 308. [2020-07-21 01:48:33,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 308 states. [2020-07-21 01:48:33,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 404 transitions. [2020-07-21 01:48:33,720 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 404 transitions. Word has length 399 [2020-07-21 01:48:33,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:33,722 INFO L479 AbstractCegarLoop]: Abstraction has 308 states and 404 transitions. [2020-07-21 01:48:33,722 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 01:48:33,723 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 404 transitions. [2020-07-21 01:48:33,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 407 [2020-07-21 01:48:33,725 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:33,726 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 49, 49, 49, 49, 11, 10, 10, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:33,938 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:33,939 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:33,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:33,940 INFO L82 PathProgramCache]: Analyzing trace with hash -1852909686, now seen corresponding path program 22 times [2020-07-21 01:48:33,940 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:33,941 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [837896240] [2020-07-21 01:48:33,941 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:34,055 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:34,056 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:34,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 729 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 01:48:34,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:34,322 INFO L134 CoverageAnalysis]: Checked inductivity of 9163 backedges. 1474 proven. 2579 refuted. 0 times theorem prover too weak. 5110 trivial. 0 not checked. [2020-07-21 01:48:34,322 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:34,718 INFO L134 CoverageAnalysis]: Checked inductivity of 9163 backedges. 762 proven. 2579 refuted. 0 times theorem prover too weak. 5822 trivial. 0 not checked. [2020-07-21 01:48:34,719 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [837896240] [2020-07-21 01:48:34,719 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:34,719 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 22 [2020-07-21 01:48:34,719 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626107014] [2020-07-21 01:48:34,720 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 01:48:34,720 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:34,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 01:48:34,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=353, Unknown=0, NotChecked=0, Total=462 [2020-07-21 01:48:34,720 INFO L87 Difference]: Start difference. First operand 308 states and 404 transitions. Second operand 22 states. [2020-07-21 01:48:36,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:36,618 INFO L93 Difference]: Finished difference Result 717 states and 960 transitions. [2020-07-21 01:48:36,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-07-21 01:48:36,618 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 406 [2020-07-21 01:48:36,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:36,621 INFO L225 Difference]: With dead ends: 717 [2020-07-21 01:48:36,622 INFO L226 Difference]: Without dead ends: 577 [2020-07-21 01:48:36,624 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 864 GetRequests, 785 SyntacticMatches, 6 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1840 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1240, Invalid=4310, Unknown=0, NotChecked=0, Total=5550 [2020-07-21 01:48:36,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 577 states. [2020-07-21 01:48:36,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 577 to 408. [2020-07-21 01:48:36,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 408 states. [2020-07-21 01:48:36,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 534 transitions. [2020-07-21 01:48:36,696 INFO L78 Accepts]: Start accepts. Automaton has 408 states and 534 transitions. Word has length 406 [2020-07-21 01:48:36,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:36,696 INFO L479 AbstractCegarLoop]: Abstraction has 408 states and 534 transitions. [2020-07-21 01:48:36,696 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 01:48:36,697 INFO L276 IsEmpty]: Start isEmpty. Operand 408 states and 534 transitions. [2020-07-21 01:48:36,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 438 [2020-07-21 01:48:36,702 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:36,703 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 54, 53, 53, 53, 53, 12, 11, 11, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:36,917 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:36,918 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:36,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:36,918 INFO L82 PathProgramCache]: Analyzing trace with hash 1246863545, now seen corresponding path program 23 times [2020-07-21 01:48:36,918 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:36,919 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [59948238] [2020-07-21 01:48:36,919 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:37,055 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:37,055 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:37,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 783 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 01:48:37,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:37,311 INFO L134 CoverageAnalysis]: Checked inductivity of 10723 backedges. 4963 proven. 592 refuted. 0 times theorem prover too weak. 5168 trivial. 0 not checked. [2020-07-21 01:48:37,311 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:37,830 INFO L134 CoverageAnalysis]: Checked inductivity of 10723 backedges. 3382 proven. 607 refuted. 0 times theorem prover too weak. 6734 trivial. 0 not checked. [2020-07-21 01:48:37,831 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [59948238] [2020-07-21 01:48:37,831 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:37,831 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 20 [2020-07-21 01:48:37,832 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379707292] [2020-07-21 01:48:37,833 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 01:48:37,833 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:37,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 01:48:37,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=286, Unknown=0, NotChecked=0, Total=380 [2020-07-21 01:48:37,835 INFO L87 Difference]: Start difference. First operand 408 states and 534 transitions. Second operand 20 states. [2020-07-21 01:48:38,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:38,382 INFO L93 Difference]: Finished difference Result 557 states and 738 transitions. [2020-07-21 01:48:38,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 01:48:38,383 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 437 [2020-07-21 01:48:38,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:38,385 INFO L225 Difference]: With dead ends: 557 [2020-07-21 01:48:38,385 INFO L226 Difference]: Without dead ends: 327 [2020-07-21 01:48:38,386 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 885 GetRequests, 849 SyntacticMatches, 6 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 181 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2020-07-21 01:48:38,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2020-07-21 01:48:38,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 327. [2020-07-21 01:48:38,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 327 states. [2020-07-21 01:48:38,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 426 transitions. [2020-07-21 01:48:38,452 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 426 transitions. Word has length 437 [2020-07-21 01:48:38,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:38,452 INFO L479 AbstractCegarLoop]: Abstraction has 327 states and 426 transitions. [2020-07-21 01:48:38,452 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 01:48:38,453 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 426 transitions. [2020-07-21 01:48:38,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 445 [2020-07-21 01:48:38,456 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:38,456 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 55, 54, 54, 54, 54, 12, 11, 11, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:38,669 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:38,670 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:38,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:38,671 INFO L82 PathProgramCache]: Analyzing trace with hash -833030556, now seen corresponding path program 24 times [2020-07-21 01:48:38,671 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:38,671 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [53913956] [2020-07-21 01:48:38,672 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:38,800 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:38,800 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:38,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 795 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 01:48:38,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:39,139 INFO L134 CoverageAnalysis]: Checked inductivity of 11109 backedges. 1311 proven. 3537 refuted. 0 times theorem prover too weak. 6261 trivial. 0 not checked. [2020-07-21 01:48:39,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:39,599 INFO L134 CoverageAnalysis]: Checked inductivity of 11109 backedges. 705 proven. 3537 refuted. 0 times theorem prover too weak. 6867 trivial. 0 not checked. [2020-07-21 01:48:39,600 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [53913956] [2020-07-21 01:48:39,600 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:39,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 26 [2020-07-21 01:48:39,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [692368088] [2020-07-21 01:48:39,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 01:48:39,601 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:39,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 01:48:39,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=509, Unknown=0, NotChecked=0, Total=650 [2020-07-21 01:48:39,601 INFO L87 Difference]: Start difference. First operand 327 states and 426 transitions. Second operand 26 states. [2020-07-21 01:48:43,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:43,025 INFO L93 Difference]: Finished difference Result 554 states and 739 transitions. [2020-07-21 01:48:43,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2020-07-21 01:48:43,025 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 444 [2020-07-21 01:48:43,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:43,027 INFO L225 Difference]: With dead ends: 554 [2020-07-21 01:48:43,027 INFO L226 Difference]: Without dead ends: 404 [2020-07-21 01:48:43,029 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 966 GetRequests, 857 SyntacticMatches, 6 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3949 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2420, Invalid=8500, Unknown=0, NotChecked=0, Total=10920 [2020-07-21 01:48:43,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 404 states. [2020-07-21 01:48:43,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 404 to 348. [2020-07-21 01:48:43,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-21 01:48:43,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 454 transitions. [2020-07-21 01:48:43,082 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 454 transitions. Word has length 444 [2020-07-21 01:48:43,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:43,082 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 454 transitions. [2020-07-21 01:48:43,082 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 01:48:43,083 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 454 transitions. [2020-07-21 01:48:43,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 483 [2020-07-21 01:48:43,086 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:43,086 INFO L422 BasicCegarLoop]: trace histogram [60, 60, 60, 59, 59, 59, 59, 13, 12, 12, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:43,299 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:43,300 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:43,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:43,301 INFO L82 PathProgramCache]: Analyzing trace with hash 1802445246, now seen corresponding path program 25 times [2020-07-21 01:48:43,301 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:43,302 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [736161455] [2020-07-21 01:48:43,302 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:43,428 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:43,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:43,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 861 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 01:48:43,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:43,772 INFO L134 CoverageAnalysis]: Checked inductivity of 13243 backedges. 6103 proven. 821 refuted. 0 times theorem prover too weak. 6319 trivial. 0 not checked. [2020-07-21 01:48:43,772 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:44,298 INFO L134 CoverageAnalysis]: Checked inductivity of 13243 backedges. 3581 proven. 1561 refuted. 0 times theorem prover too weak. 8101 trivial. 0 not checked. [2020-07-21 01:48:44,298 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [736161455] [2020-07-21 01:48:44,298 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:44,298 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 24 [2020-07-21 01:48:44,298 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [821054372] [2020-07-21 01:48:44,299 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 01:48:44,299 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:44,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 01:48:44,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=424, Unknown=0, NotChecked=0, Total=552 [2020-07-21 01:48:44,299 INFO L87 Difference]: Start difference. First operand 348 states and 454 transitions. Second operand 24 states. [2020-07-21 01:48:45,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:45,141 INFO L93 Difference]: Finished difference Result 481 states and 637 transitions. [2020-07-21 01:48:45,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-21 01:48:45,141 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 482 [2020-07-21 01:48:45,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:45,143 INFO L225 Difference]: With dead ends: 481 [2020-07-21 01:48:45,143 INFO L226 Difference]: Without dead ends: 348 [2020-07-21 01:48:45,145 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 983 GetRequests, 935 SyntacticMatches, 6 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=533, Invalid=1359, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 01:48:45,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2020-07-21 01:48:45,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 348. [2020-07-21 01:48:45,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-21 01:48:45,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 452 transitions. [2020-07-21 01:48:45,205 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 452 transitions. Word has length 482 [2020-07-21 01:48:45,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:45,206 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 452 transitions. [2020-07-21 01:48:45,206 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 01:48:45,206 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 452 transitions. [2020-07-21 01:48:45,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-21 01:48:45,210 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:45,210 INFO L422 BasicCegarLoop]: trace histogram [61, 61, 61, 60, 60, 60, 60, 13, 12, 12, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:45,424 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:45,425 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:45,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:45,426 INFO L82 PathProgramCache]: Analyzing trace with hash 564016575, now seen corresponding path program 26 times [2020-07-21 01:48:45,426 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:45,426 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1563224749] [2020-07-21 01:48:45,427 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:45,559 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:45,559 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:45,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 873 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 01:48:45,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:45,995 INFO L134 CoverageAnalysis]: Checked inductivity of 13672 backedges. 1082 proven. 4783 refuted. 0 times theorem prover too weak. 7807 trivial. 0 not checked. [2020-07-21 01:48:45,995 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:46,640 INFO L134 CoverageAnalysis]: Checked inductivity of 13672 backedges. 622 proven. 4783 refuted. 0 times theorem prover too weak. 8267 trivial. 0 not checked. [2020-07-21 01:48:46,640 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1563224749] [2020-07-21 01:48:46,640 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:46,640 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 30 [2020-07-21 01:48:46,641 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396386804] [2020-07-21 01:48:46,641 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-21 01:48:46,641 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:46,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-21 01:48:46,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=691, Unknown=0, NotChecked=0, Total=870 [2020-07-21 01:48:46,642 INFO L87 Difference]: Start difference. First operand 348 states and 452 transitions. Second operand 30 states. [2020-07-21 01:48:51,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:51,235 INFO L93 Difference]: Finished difference Result 561 states and 744 transitions. [2020-07-21 01:48:51,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2020-07-21 01:48:51,236 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 489 [2020-07-21 01:48:51,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:51,239 INFO L225 Difference]: With dead ends: 561 [2020-07-21 01:48:51,239 INFO L226 Difference]: Without dead ends: 408 [2020-07-21 01:48:51,241 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1069 GetRequests, 943 SyntacticMatches, 6 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5393 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=3316, Invalid=11446, Unknown=0, NotChecked=0, Total=14762 [2020-07-21 01:48:51,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2020-07-21 01:48:51,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 372. [2020-07-21 01:48:51,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 372 states. [2020-07-21 01:48:51,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 372 states to 372 states and 484 transitions. [2020-07-21 01:48:51,308 INFO L78 Accepts]: Start accepts. Automaton has 372 states and 484 transitions. Word has length 489 [2020-07-21 01:48:51,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:51,309 INFO L479 AbstractCegarLoop]: Abstraction has 372 states and 484 transitions. [2020-07-21 01:48:51,309 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-21 01:48:51,309 INFO L276 IsEmpty]: Start isEmpty. Operand 372 states and 484 transitions. [2020-07-21 01:48:51,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 535 [2020-07-21 01:48:51,314 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:51,314 INFO L422 BasicCegarLoop]: trace histogram [67, 67, 67, 66, 66, 66, 66, 14, 13, 13, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:51,528 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:51,529 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:51,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:51,529 INFO L82 PathProgramCache]: Analyzing trace with hash 869445188, now seen corresponding path program 27 times [2020-07-21 01:48:51,529 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:51,529 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1063199859] [2020-07-21 01:48:51,529 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 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:51,667 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:51,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:51,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 951 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 01:48:51,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:52,229 INFO L134 CoverageAnalysis]: Checked inductivity of 16502 backedges. 7544 proven. 1104 refuted. 0 times theorem prover too weak. 7854 trivial. 0 not checked. [2020-07-21 01:48:52,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:53,111 INFO L134 CoverageAnalysis]: Checked inductivity of 16502 backedges. 3915 proven. 2699 refuted. 0 times theorem prover too weak. 9888 trivial. 0 not checked. [2020-07-21 01:48:53,111 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1063199859] [2020-07-21 01:48:53,111 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:53,112 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 28 [2020-07-21 01:48:53,112 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [368657248] [2020-07-21 01:48:53,113 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-21 01:48:53,114 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:53,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-21 01:48:53,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=588, Unknown=0, NotChecked=0, Total=756 [2020-07-21 01:48:53,115 INFO L87 Difference]: Start difference. First operand 372 states and 484 transitions. Second operand 28 states. [2020-07-21 01:48:54,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:54,463 INFO L93 Difference]: Finished difference Result 505 states and 666 transitions. [2020-07-21 01:48:54,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 01:48:54,463 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 534 [2020-07-21 01:48:54,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:54,471 INFO L225 Difference]: With dead ends: 505 [2020-07-21 01:48:54,471 INFO L226 Difference]: Without dead ends: 372 [2020-07-21 01:48:54,473 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1095 GetRequests, 1035 SyntacticMatches, 6 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 630 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=863, Invalid=2217, Unknown=0, NotChecked=0, Total=3080 [2020-07-21 01:48:54,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 372 states. [2020-07-21 01:48:54,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 372 to 341. [2020-07-21 01:48:54,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 341 states. [2020-07-21 01:48:54,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 437 transitions. [2020-07-21 01:48:54,537 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 437 transitions. Word has length 534 [2020-07-21 01:48:54,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:54,538 INFO L479 AbstractCegarLoop]: Abstraction has 341 states and 437 transitions. [2020-07-21 01:48:54,538 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-21 01:48:54,538 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 437 transitions. [2020-07-21 01:48:54,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 542 [2020-07-21 01:48:54,542 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:54,543 INFO L422 BasicCegarLoop]: trace histogram [68, 68, 68, 67, 67, 67, 67, 14, 13, 13, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:54,757 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:54,758 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:54,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:54,758 INFO L82 PathProgramCache]: Analyzing trace with hash 943892089, now seen corresponding path program 28 times [2020-07-21 01:48:54,758 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:54,758 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [140308465] [2020-07-21 01:48:54,758 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:54,895 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:54,895 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:54,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 963 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 01:48:54,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:55,486 INFO L134 CoverageAnalysis]: Checked inductivity of 16981 backedges. 766 proven. 6380 refuted. 0 times theorem prover too weak. 9835 trivial. 0 not checked. [2020-07-21 01:48:55,486 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:56,201 INFO L134 CoverageAnalysis]: Checked inductivity of 16981 backedges. 504 proven. 6380 refuted. 0 times theorem prover too weak. 10097 trivial. 0 not checked. [2020-07-21 01:48:56,201 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [140308465] [2020-07-21 01:48:56,201 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:56,201 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 34 [2020-07-21 01:48:56,201 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255985158] [2020-07-21 01:48:56,202 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-21 01:48:56,202 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:56,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-21 01:48:56,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=899, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 01:48:56,203 INFO L87 Difference]: Start difference. First operand 341 states and 437 transitions. Second operand 34 states. [2020-07-21 01:49:01,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:49:01,968 INFO L93 Difference]: Finished difference Result 529 states and 691 transitions. [2020-07-21 01:49:01,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2020-07-21 01:49:01,969 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 541 [2020-07-21 01:49:01,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:49:01,971 INFO L225 Difference]: With dead ends: 529 [2020-07-21 01:49:01,971 INFO L226 Difference]: Without dead ends: 404 [2020-07-21 01:49:01,974 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1182 GetRequests, 1043 SyntacticMatches, 6 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6579 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=3980, Invalid=14110, Unknown=0, NotChecked=0, Total=18090 [2020-07-21 01:49:01,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 404 states. [2020-07-21 01:49:02,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 404 to 368. [2020-07-21 01:49:02,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2020-07-21 01:49:02,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 473 transitions. [2020-07-21 01:49:02,034 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 473 transitions. Word has length 541 [2020-07-21 01:49:02,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:49:02,035 INFO L479 AbstractCegarLoop]: Abstraction has 368 states and 473 transitions. [2020-07-21 01:49:02,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-21 01:49:02,035 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 473 transitions. [2020-07-21 01:49:02,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 594 [2020-07-21 01:49:02,040 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:49:02,041 INFO L422 BasicCegarLoop]: trace histogram [75, 75, 75, 74, 74, 74, 74, 15, 14, 14, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:49:02,253 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:02,254 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:49:02,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:49:02,254 INFO L82 PathProgramCache]: Analyzing trace with hash 1328811571, now seen corresponding path program 29 times [2020-07-21 01:49:02,254 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:49:02,254 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [156647117] [2020-07-21 01:49:02,254 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:02,418 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:49:02,418 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:49:02,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 1053 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 01:49:02,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:49:02,980 INFO L134 CoverageAnalysis]: Checked inductivity of 20650 backedges. 9340 proven. 1450 refuted. 0 times theorem prover too weak. 9860 trivial. 0 not checked. [2020-07-21 01:49:02,981 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:49:03,792 INFO L134 CoverageAnalysis]: Checked inductivity of 20650 backedges. 4438 proven. 4030 refuted. 0 times theorem prover too weak. 12182 trivial. 0 not checked. [2020-07-21 01:49:03,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [156647117] [2020-07-21 01:49:03,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:49:03,793 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 32 [2020-07-21 01:49:03,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797010914] [2020-07-21 01:49:03,793 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-21 01:49:03,793 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:49:03,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-21 01:49:03,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=778, Unknown=0, NotChecked=0, Total=992 [2020-07-21 01:49:03,794 INFO L87 Difference]: Start difference. First operand 368 states and 473 transitions. Second operand 32 states. [2020-07-21 01:49:05,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:49:05,461 INFO L93 Difference]: Finished difference Result 512 states and 672 transitions. [2020-07-21 01:49:05,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-07-21 01:49:05,462 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 593 [2020-07-21 01:49:05,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:49:05,464 INFO L225 Difference]: With dead ends: 512 [2020-07-21 01:49:05,464 INFO L226 Difference]: Without dead ends: 410 [2020-07-21 01:49:05,467 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1221 GetRequests, 1149 SyntacticMatches, 6 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 974 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1270, Invalid=3286, Unknown=0, NotChecked=0, Total=4556 [2020-07-21 01:49:05,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2020-07-21 01:49:05,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 402. [2020-07-21 01:49:05,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 402 states. [2020-07-21 01:49:05,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 521 transitions. [2020-07-21 01:49:05,535 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 521 transitions. Word has length 593 [2020-07-21 01:49:05,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:49:05,535 INFO L479 AbstractCegarLoop]: Abstraction has 402 states and 521 transitions. [2020-07-21 01:49:05,535 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-21 01:49:05,535 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 521 transitions. [2020-07-21 01:49:05,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 601 [2020-07-21 01:49:05,540 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:49:05,540 INFO L422 BasicCegarLoop]: trace histogram [76, 76, 76, 75, 75, 75, 75, 15, 14, 14, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:49:05,755 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:05,756 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:49:05,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:49:05,756 INFO L82 PathProgramCache]: Analyzing trace with hash 1218530218, now seen corresponding path program 30 times [2020-07-21 01:49:05,756 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:49:05,756 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1595786503] [2020-07-21 01:49:05,757 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:05,912 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:49:05,912 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:49:05,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 1065 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 01:49:05,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:49:06,579 INFO L134 CoverageAnalysis]: Checked inductivity of 21186 backedges. 342 proven. 8400 refuted. 0 times theorem prover too weak. 12444 trivial. 0 not checked. [2020-07-21 01:49:06,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:49:07,465 INFO L134 CoverageAnalysis]: Checked inductivity of 21186 backedges. 342 proven. 8400 refuted. 0 times theorem prover too weak. 12444 trivial. 0 not checked. [2020-07-21 01:49:07,466 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1595786503] [2020-07-21 01:49:07,466 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:49:07,466 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 38 [2020-07-21 01:49:07,466 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623380445] [2020-07-21 01:49:07,467 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-21 01:49:07,467 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:49:07,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-21 01:49:07,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=273, Invalid=1133, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 01:49:07,467 INFO L87 Difference]: Start difference. First operand 402 states and 521 transitions. Second operand 38 states. [2020-07-21 01:49:14,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:49:14,300 INFO L93 Difference]: Finished difference Result 711 states and 940 transitions. [2020-07-21 01:49:14,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2020-07-21 01:49:14,301 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 600 [2020-07-21 01:49:14,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:49:14,304 INFO L225 Difference]: With dead ends: 711 [2020-07-21 01:49:14,304 INFO L226 Difference]: Without dead ends: 529 [2020-07-21 01:49:14,307 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1313 GetRequests, 1157 SyntacticMatches, 6 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8485 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=5519, Invalid=17433, Unknown=0, NotChecked=0, Total=22952 [2020-07-21 01:49:14,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 529 states. [2020-07-21 01:49:14,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 529 to 434. [2020-07-21 01:49:14,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 434 states. [2020-07-21 01:49:14,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 434 states to 434 states and 565 transitions. [2020-07-21 01:49:14,377 INFO L78 Accepts]: Start accepts. Automaton has 434 states and 565 transitions. Word has length 600 [2020-07-21 01:49:14,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:49:14,378 INFO L479 AbstractCegarLoop]: Abstraction has 434 states and 565 transitions. [2020-07-21 01:49:14,378 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-21 01:49:14,378 INFO L276 IsEmpty]: Start isEmpty. Operand 434 states and 565 transitions. [2020-07-21 01:49:14,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 663 [2020-07-21 01:49:14,383 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:49:14,384 INFO L422 BasicCegarLoop]: trace histogram [84, 84, 84, 83, 83, 83, 83, 16, 15, 15, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:49:14,598 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:14,599 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:49:14,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:49:14,599 INFO L82 PathProgramCache]: Analyzing trace with hash -955730672, now seen corresponding path program 31 times [2020-07-21 01:49:14,599 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:49:14,600 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1098924145] [2020-07-21 01:49:14,600 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:14,769 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:49:14,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:49:14,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 1173 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 01:49:14,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:49:15,518 INFO L134 CoverageAnalysis]: Checked inductivity of 25890 backedges. 11585 proven. 1868 refuted. 0 times theorem prover too weak. 12437 trivial. 0 not checked. [2020-07-21 01:49:15,518 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:49:16,517 INFO L134 CoverageAnalysis]: Checked inductivity of 25890 backedges. 5244 proven. 5563 refuted. 0 times theorem prover too weak. 15083 trivial. 0 not checked. [2020-07-21 01:49:16,518 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1098924145] [2020-07-21 01:49:16,518 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:49:16,518 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 36 [2020-07-21 01:49:16,518 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917603932] [2020-07-21 01:49:16,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 01:49:16,519 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:49:16,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 01:49:16,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=994, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 01:49:16,520 INFO L87 Difference]: Start difference. First operand 434 states and 565 transitions. Second operand 36 states. [2020-07-21 01:49:19,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:49:19,072 INFO L93 Difference]: Finished difference Result 642 states and 851 transitions. [2020-07-21 01:49:19,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-07-21 01:49:19,072 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 662 [2020-07-21 01:49:19,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:49:19,076 INFO L225 Difference]: With dead ends: 642 [2020-07-21 01:49:19,076 INFO L226 Difference]: Without dead ends: 476 [2020-07-21 01:49:19,077 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1368 GetRequests, 1283 SyntacticMatches, 6 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1415 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1819, Invalid=4661, Unknown=0, NotChecked=0, Total=6480 [2020-07-21 01:49:19,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 476 states. [2020-07-21 01:49:19,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 476 to 468. [2020-07-21 01:49:19,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 468 states. [2020-07-21 01:49:19,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 612 transitions. [2020-07-21 01:49:19,147 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 612 transitions. Word has length 662 [2020-07-21 01:49:19,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:49:19,148 INFO L479 AbstractCegarLoop]: Abstraction has 468 states and 612 transitions. [2020-07-21 01:49:19,148 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 01:49:19,148 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 612 transitions. [2020-07-21 01:49:19,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 670 [2020-07-21 01:49:19,154 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:49:19,154 INFO L422 BasicCegarLoop]: trace histogram [85, 85, 85, 84, 84, 84, 84, 16, 15, 15, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:49:19,367 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:19,368 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:49:19,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:49:19,368 INFO L82 PathProgramCache]: Analyzing trace with hash 2116259269, now seen corresponding path program 32 times [2020-07-21 01:49:19,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:49:19,369 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [59852751] [2020-07-21 01:49:19,369 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:19,538 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:49:19,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:49:19,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 1185 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 01:49:19,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:49:20,034 INFO L134 CoverageAnalysis]: Checked inductivity of 26490 backedges. 2043 proven. 8366 refuted. 0 times theorem prover too weak. 16081 trivial. 0 not checked. [2020-07-21 01:49:20,035 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:49:20,807 INFO L134 CoverageAnalysis]: Checked inductivity of 26490 backedges. 1077 proven. 8366 refuted. 0 times theorem prover too weak. 17047 trivial. 0 not checked. [2020-07-21 01:49:20,807 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [59852751] [2020-07-21 01:49:20,807 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:49:20,807 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 25 [2020-07-21 01:49:20,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896467036] [2020-07-21 01:49:20,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 01:49:20,808 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:49:20,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 01:49:20,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=460, Unknown=0, NotChecked=0, Total=600 [2020-07-21 01:49:20,809 INFO L87 Difference]: Start difference. First operand 468 states and 612 transitions. Second operand 25 states. [2020-07-21 01:49:23,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:49:23,940 INFO L93 Difference]: Finished difference Result 1038 states and 1381 transitions. [2020-07-21 01:49:23,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2020-07-21 01:49:23,941 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 669 [2020-07-21 01:49:23,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:49:23,945 INFO L225 Difference]: With dead ends: 1038 [2020-07-21 01:49:23,945 INFO L226 Difference]: Without dead ends: 861 [2020-07-21 01:49:23,947 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1409 GetRequests, 1307 SyntacticMatches, 7 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3368 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2002, Invalid=7310, Unknown=0, NotChecked=0, Total=9312 [2020-07-21 01:49:23,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 861 states. [2020-07-21 01:49:24,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 861 to 613. [2020-07-21 01:49:24,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 613 states. [2020-07-21 01:49:24,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 613 states to 613 states and 801 transitions. [2020-07-21 01:49:24,072 INFO L78 Accepts]: Start accepts. Automaton has 613 states and 801 transitions. Word has length 669 [2020-07-21 01:49:24,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:49:24,072 INFO L479 AbstractCegarLoop]: Abstraction has 613 states and 801 transitions. [2020-07-21 01:49:24,072 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 01:49:24,072 INFO L276 IsEmpty]: Start isEmpty. Operand 613 states and 801 transitions. [2020-07-21 01:49:24,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 708 [2020-07-21 01:49:24,078 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:49:24,079 INFO L422 BasicCegarLoop]: trace histogram [90, 90, 90, 89, 89, 89, 89, 17, 16, 16, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:49:24,292 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:24,293 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:49:24,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:49:24,293 INFO L82 PathProgramCache]: Analyzing trace with hash -1360123809, now seen corresponding path program 33 times [2020-07-21 01:49:24,294 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:49:24,294 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [280291374] [2020-07-21 01:49:24,294 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:24,471 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:49:24,471 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:49:24,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 1251 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 01:49:24,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:49:24,943 INFO L134 CoverageAnalysis]: Checked inductivity of 29737 backedges. 12393 proven. 1325 refuted. 0 times theorem prover too weak. 16019 trivial. 0 not checked. [2020-07-21 01:49:24,943 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:49:25,753 INFO L134 CoverageAnalysis]: Checked inductivity of 29737 backedges. 9510 proven. 1346 refuted. 0 times theorem prover too weak. 18881 trivial. 0 not checked. [2020-07-21 01:49:25,753 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [280291374] [2020-07-21 01:49:25,753 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:49:25,754 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 23 [2020-07-21 01:49:25,754 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050417994] [2020-07-21 01:49:25,755 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 01:49:25,755 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:49:25,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 01:49:25,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=383, Unknown=0, NotChecked=0, Total=506 [2020-07-21 01:49:25,755 INFO L87 Difference]: Start difference. First operand 613 states and 801 transitions. Second operand 23 states. [2020-07-21 01:49:26,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:49:26,570 INFO L93 Difference]: Finished difference Result 802 states and 1058 transitions. [2020-07-21 01:49:26,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 01:49:26,571 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 707 [2020-07-21 01:49:26,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:49:26,574 INFO L225 Difference]: With dead ends: 802 [2020-07-21 01:49:26,574 INFO L226 Difference]: Without dead ends: 490 [2020-07-21 01:49:26,576 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1428 GetRequests, 1385 SyntacticMatches, 7 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 266 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=395, Invalid=1011, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 01:49:26,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2020-07-21 01:49:26,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 490. [2020-07-21 01:49:26,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 490 states. [2020-07-21 01:49:26,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 638 transitions. [2020-07-21 01:49:26,658 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 638 transitions. Word has length 707 [2020-07-21 01:49:26,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:49:26,659 INFO L479 AbstractCegarLoop]: Abstraction has 490 states and 638 transitions. [2020-07-21 01:49:26,659 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 01:49:26,659 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 638 transitions. [2020-07-21 01:49:26,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 715 [2020-07-21 01:49:26,665 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:49:26,665 INFO L422 BasicCegarLoop]: trace histogram [91, 91, 91, 90, 90, 90, 90, 17, 16, 16, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:49:26,874 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:26,875 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:49:26,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:49:26,876 INFO L82 PathProgramCache]: Analyzing trace with hash 1558816766, now seen corresponding path program 34 times [2020-07-21 01:49:26,876 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:49:26,877 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [783403829] [2020-07-21 01:49:26,877 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:27,059 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:49:27,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:49:27,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 1263 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 01:49:27,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:49:27,642 INFO L134 CoverageAnalysis]: Checked inductivity of 30380 backedges. 1600 proven. 10313 refuted. 0 times theorem prover too weak. 18467 trivial. 0 not checked. [2020-07-21 01:49:27,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:49:28,540 INFO L134 CoverageAnalysis]: Checked inductivity of 30380 backedges. 900 proven. 10313 refuted. 0 times theorem prover too weak. 19167 trivial. 0 not checked. [2020-07-21 01:49:28,540 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [783403829] [2020-07-21 01:49:28,540 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:49:28,540 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 29 [2020-07-21 01:49:28,541 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958020460] [2020-07-21 01:49:28,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 01:49:28,541 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:49:28,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 01:49:28,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=637, Unknown=0, NotChecked=0, Total=812 [2020-07-21 01:49:28,542 INFO L87 Difference]: Start difference. First operand 490 states and 638 transitions. Second operand 29 states. [2020-07-21 01:49:34,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:49:34,387 INFO L93 Difference]: Finished difference Result 794 states and 1055 transitions. [2020-07-21 01:49:34,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2020-07-21 01:49:34,388 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 714 [2020-07-21 01:49:34,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:49:34,390 INFO L225 Difference]: With dead ends: 794 [2020-07-21 01:49:34,391 INFO L226 Difference]: Without dead ends: 607 [2020-07-21 01:49:34,393 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1540 GetRequests, 1393 SyntacticMatches, 7 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8078 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=4264, Invalid=15758, Unknown=0, NotChecked=0, Total=20022 [2020-07-21 01:49:34,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 607 states. [2020-07-21 01:49:34,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 607 to 514. [2020-07-21 01:49:34,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 514 states. [2020-07-21 01:49:34,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 670 transitions. [2020-07-21 01:49:34,471 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 670 transitions. Word has length 714 [2020-07-21 01:49:34,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:49:34,471 INFO L479 AbstractCegarLoop]: Abstraction has 514 states and 670 transitions. [2020-07-21 01:49:34,471 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 01:49:34,471 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 670 transitions. [2020-07-21 01:49:34,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 760 [2020-07-21 01:49:34,477 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:49:34,477 INFO L422 BasicCegarLoop]: trace histogram [97, 97, 97, 96, 96, 96, 96, 18, 17, 17, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:49:34,683 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:34,684 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:49:34,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:49:34,685 INFO L82 PathProgramCache]: Analyzing trace with hash 937711205, now seen corresponding path program 35 times [2020-07-21 01:49:34,685 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:49:34,685 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1974733058] [2020-07-21 01:49:34,686 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 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:34,878 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:49:34,879 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:49:34,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 1341 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 01:49:34,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:49:35,575 INFO L134 CoverageAnalysis]: Checked inductivity of 34537 backedges. 14441 proven. 1702 refuted. 0 times theorem prover too weak. 18394 trivial. 0 not checked. [2020-07-21 01:49:35,576 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:49:36,557 INFO L134 CoverageAnalysis]: Checked inductivity of 34537 backedges. 9740 proven. 3289 refuted. 0 times theorem prover too weak. 21508 trivial. 0 not checked. [2020-07-21 01:49:36,558 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1974733058] [2020-07-21 01:49:36,558 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:49:36,558 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 27 [2020-07-21 01:49:36,558 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [59168055] [2020-07-21 01:49:36,559 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 01:49:36,559 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:49:36,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 01:49:36,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=541, Unknown=0, NotChecked=0, Total=702 [2020-07-21 01:49:36,560 INFO L87 Difference]: Start difference. First operand 514 states and 670 transitions. Second operand 27 states. [2020-07-21 01:49:37,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:49:37,886 INFO L93 Difference]: Finished difference Result 684 states and 902 transitions. [2020-07-21 01:49:37,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 01:49:37,887 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 759 [2020-07-21 01:49:37,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:49:37,889 INFO L225 Difference]: With dead ends: 684 [2020-07-21 01:49:37,889 INFO L226 Difference]: Without dead ends: 514 [2020-07-21 01:49:37,890 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1541 GetRequests, 1485 SyntacticMatches, 7 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 486 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=713, Invalid=1837, Unknown=0, NotChecked=0, Total=2550 [2020-07-21 01:49:37,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2020-07-21 01:49:37,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 514. [2020-07-21 01:49:37,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 514 states. [2020-07-21 01:49:37,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 668 transitions. [2020-07-21 01:49:37,991 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 668 transitions. Word has length 759 [2020-07-21 01:49:37,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:49:37,991 INFO L479 AbstractCegarLoop]: Abstraction has 514 states and 668 transitions. [2020-07-21 01:49:37,991 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 01:49:37,992 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 668 transitions. [2020-07-21 01:49:37,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 767 [2020-07-21 01:49:37,998 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:49:37,999 INFO L422 BasicCegarLoop]: trace histogram [98, 98, 98, 97, 97, 97, 97, 18, 17, 17, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:49:38,212 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:38,213 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:49:38,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:49:38,214 INFO L82 PathProgramCache]: Analyzing trace with hash -661993672, now seen corresponding path program 36 times [2020-07-21 01:49:38,214 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:49:38,214 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [801718874] [2020-07-21 01:49:38,215 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:38,503 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:49:38,503 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:49:38,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 1353 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 01:49:38,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:49:39,268 INFO L134 CoverageAnalysis]: Checked inductivity of 35230 backedges. 1070 proven. 12705 refuted. 0 times theorem prover too weak. 21455 trivial. 0 not checked. [2020-07-21 01:49:39,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:49:40,352 INFO L134 CoverageAnalysis]: Checked inductivity of 35230 backedges. 688 proven. 12705 refuted. 0 times theorem prover too weak. 21837 trivial. 0 not checked. [2020-07-21 01:49:40,352 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [801718874] [2020-07-21 01:49:40,353 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:49:40,353 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 33 [2020-07-21 01:49:40,353 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180226227] [2020-07-21 01:49:40,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 01:49:40,354 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:49:40,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 01:49:40,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=840, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 01:49:40,354 INFO L87 Difference]: Start difference. First operand 514 states and 668 transitions. Second operand 33 states. [2020-07-21 01:49:48,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:49:48,488 INFO L93 Difference]: Finished difference Result 793 states and 1047 transitions. [2020-07-21 01:49:48,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2020-07-21 01:49:48,489 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 766 [2020-07-21 01:49:48,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:49:48,493 INFO L225 Difference]: With dead ends: 793 [2020-07-21 01:49:48,494 INFO L226 Difference]: Without dead ends: 603 [2020-07-21 01:49:48,496 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1662 GetRequests, 1493 SyntacticMatches, 7 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10746 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=5648, Invalid=21084, Unknown=0, NotChecked=0, Total=26732 [2020-07-21 01:49:48,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 603 states. [2020-07-21 01:49:48,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 603 to 541. [2020-07-21 01:49:48,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 541 states. [2020-07-21 01:49:48,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 541 states to 541 states and 704 transitions. [2020-07-21 01:49:48,578 INFO L78 Accepts]: Start accepts. Automaton has 541 states and 704 transitions. Word has length 766 [2020-07-21 01:49:48,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:49:48,578 INFO L479 AbstractCegarLoop]: Abstraction has 541 states and 704 transitions. [2020-07-21 01:49:48,578 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 01:49:48,578 INFO L276 IsEmpty]: Start isEmpty. Operand 541 states and 704 transitions. [2020-07-21 01:49:48,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 819 [2020-07-21 01:49:48,583 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:49:48,584 INFO L422 BasicCegarLoop]: trace histogram [105, 105, 105, 104, 104, 104, 104, 19, 18, 18, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:49:48,794 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:48,795 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:49:48,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:49:48,796 INFO L82 PathProgramCache]: Analyzing trace with hash -1871274638, now seen corresponding path program 37 times [2020-07-21 01:49:48,796 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:49:48,797 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1913663971] [2020-07-21 01:49:48,797 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 [2020-07-21 01:49:48,999 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:49:48,999 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:49:49,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 1443 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 01:49:49,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:49:49,807 INFO L134 CoverageAnalysis]: Checked inductivity of 40440 backedges. 16938 proven. 2142 refuted. 0 times theorem prover too weak. 21360 trivial. 0 not checked. [2020-07-21 01:49:49,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:49:51,009 INFO L134 CoverageAnalysis]: Checked inductivity of 40440 backedges. 10143 proven. 5535 refuted. 0 times theorem prover too weak. 24762 trivial. 0 not checked. [2020-07-21 01:49:51,009 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1913663971] [2020-07-21 01:49:51,009 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:49:51,009 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 31 [2020-07-21 01:49:51,009 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533490906] [2020-07-21 01:49:51,010 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 01:49:51,010 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:49:51,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 01:49:51,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=725, Unknown=0, NotChecked=0, Total=930 [2020-07-21 01:49:51,011 INFO L87 Difference]: Start difference. First operand 541 states and 704 transitions. Second operand 31 states. [2020-07-21 01:49:52,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:49:52,829 INFO L93 Difference]: Finished difference Result 711 states and 935 transitions. [2020-07-21 01:49:52,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-21 01:49:52,830 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 818 [2020-07-21 01:49:52,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:49:52,836 INFO L225 Difference]: With dead ends: 711 [2020-07-21 01:49:52,836 INFO L226 Difference]: Without dead ends: 541 [2020-07-21 01:49:52,837 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1668 GetRequests, 1599 SyntacticMatches, 7 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 841 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1113, Invalid=2919, Unknown=0, NotChecked=0, Total=4032 [2020-07-21 01:49:52,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 541 states. [2020-07-21 01:49:52,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 541 to 541. [2020-07-21 01:49:52,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 541 states. [2020-07-21 01:49:52,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 541 states to 541 states and 702 transitions. [2020-07-21 01:49:52,923 INFO L78 Accepts]: Start accepts. Automaton has 541 states and 702 transitions. Word has length 818 [2020-07-21 01:49:52,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:49:52,924 INFO L479 AbstractCegarLoop]: Abstraction has 541 states and 702 transitions. [2020-07-21 01:49:52,924 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 01:49:52,924 INFO L276 IsEmpty]: Start isEmpty. Operand 541 states and 702 transitions. [2020-07-21 01:49:52,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 826 [2020-07-21 01:49:52,929 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:49:52,929 INFO L422 BasicCegarLoop]: trace histogram [106, 106, 106, 105, 105, 105, 105, 19, 18, 18, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:49:53,130 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:53,130 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:49:53,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:49:53,132 INFO L82 PathProgramCache]: Analyzing trace with hash -778442869, now seen corresponding path program 38 times [2020-07-21 01:49:53,132 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:49:53,132 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [796205453] [2020-07-21 01:49:53,133 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 [2020-07-21 01:49:53,336 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:49:53,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:49:53,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 1455 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 01:49:53,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:49:54,263 INFO L134 CoverageAnalysis]: Checked inductivity of 41190 backedges. 432 proven. 15614 refuted. 0 times theorem prover too weak. 25144 trivial. 0 not checked. [2020-07-21 01:49:54,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:49:55,577 INFO L134 CoverageAnalysis]: Checked inductivity of 41190 backedges. 432 proven. 15614 refuted. 0 times theorem prover too weak. 25144 trivial. 0 not checked. [2020-07-21 01:49:55,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [796205453] [2020-07-21 01:49:55,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:49:55,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 37 [2020-07-21 01:49:55,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357029868] [2020-07-21 01:49:55,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-21 01:49:55,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:49:55,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-21 01:49:55,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=1069, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 01:49:55,579 INFO L87 Difference]: Start difference. First operand 541 states and 702 transitions. Second operand 37 states. [2020-07-21 01:50:07,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:50:07,110 INFO L93 Difference]: Finished difference Result 800 states and 1052 transitions. [2020-07-21 01:50:07,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 158 states. [2020-07-21 01:50:07,111 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 825 [2020-07-21 01:50:07,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:50:07,115 INFO L225 Difference]: With dead ends: 800 [2020-07-21 01:50:07,115 INFO L226 Difference]: Without dead ends: 607 [2020-07-21 01:50:07,119 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1800 GetRequests, 1607 SyntacticMatches, 7 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14327 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=7368, Invalid=27788, Unknown=0, NotChecked=0, Total=35156 [2020-07-21 01:50:07,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 607 states. [2020-07-21 01:50:07,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 607 to 571. [2020-07-21 01:50:07,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 571 states. [2020-07-21 01:50:07,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 571 states to 571 states and 742 transitions. [2020-07-21 01:50:07,207 INFO L78 Accepts]: Start accepts. Automaton has 571 states and 742 transitions. Word has length 825 [2020-07-21 01:50:07,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:50:07,208 INFO L479 AbstractCegarLoop]: Abstraction has 571 states and 742 transitions. [2020-07-21 01:50:07,208 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-21 01:50:07,208 INFO L276 IsEmpty]: Start isEmpty. Operand 571 states and 742 transitions. [2020-07-21 01:50:07,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 885 [2020-07-21 01:50:07,214 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:50:07,214 INFO L422 BasicCegarLoop]: trace histogram [114, 114, 114, 113, 113, 113, 113, 20, 19, 19, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:50:07,414 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:50:07,415 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:50:07,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:50:07,416 INFO L82 PathProgramCache]: Analyzing trace with hash -1882081448, now seen corresponding path program 39 times [2020-07-21 01:50:07,416 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:50:07,417 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [326246853] [2020-07-21 01:50:07,417 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 01:50:07,640 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:50:07,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:50:07,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 1557 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 01:50:07,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:50:08,624 INFO L134 CoverageAnalysis]: Checked inductivity of 47617 backedges. 19947 proven. 2654 refuted. 0 times theorem prover too weak. 25016 trivial. 0 not checked. [2020-07-21 01:50:08,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:50:10,140 INFO L134 CoverageAnalysis]: Checked inductivity of 47617 backedges. 10782 proven. 8093 refuted. 0 times theorem prover too weak. 28742 trivial. 0 not checked. [2020-07-21 01:50:10,140 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [326246853] [2020-07-21 01:50:10,140 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:50:10,141 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 35 [2020-07-21 01:50:10,141 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021388977] [2020-07-21 01:50:10,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 01:50:10,142 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:50:10,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 01:50:10,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=935, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 01:50:10,142 INFO L87 Difference]: Start difference. First operand 571 states and 742 transitions. Second operand 35 states. [2020-07-21 01:50:12,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:50:12,877 INFO L93 Difference]: Finished difference Result 742 states and 973 transitions. [2020-07-21 01:50:12,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-21 01:50:12,878 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 884 [2020-07-21 01:50:12,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:50:12,881 INFO L225 Difference]: With dead ends: 742 [2020-07-21 01:50:12,882 INFO L226 Difference]: Without dead ends: 572 [2020-07-21 01:50:12,883 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1809 GetRequests, 1727 SyntacticMatches, 7 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1265 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1621, Invalid=4231, Unknown=0, NotChecked=0, Total=5852 [2020-07-21 01:50:12,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 572 states. [2020-07-21 01:50:12,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 572 to 540. [2020-07-21 01:50:12,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 540 states. [2020-07-21 01:50:12,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 540 states to 540 states and 697 transitions. [2020-07-21 01:50:12,985 INFO L78 Accepts]: Start accepts. Automaton has 540 states and 697 transitions. Word has length 884 [2020-07-21 01:50:12,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:50:12,986 INFO L479 AbstractCegarLoop]: Abstraction has 540 states and 697 transitions. [2020-07-21 01:50:12,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 01:50:12,986 INFO L276 IsEmpty]: Start isEmpty. Operand 540 states and 697 transitions. [2020-07-21 01:50:12,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 892 [2020-07-21 01:50:12,994 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:50:12,994 INFO L422 BasicCegarLoop]: trace histogram [115, 115, 115, 114, 114, 114, 114, 20, 19, 19, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:50:13,209 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:50:13,210 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:50:13,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:50:13,211 INFO L82 PathProgramCache]: Analyzing trace with hash 932118245, now seen corresponding path program 40 times [2020-07-21 01:50:13,211 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:50:13,211 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2015647701] [2020-07-21 01:50:13,211 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 [2020-07-21 01:50:13,582 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:50:13,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:50:13,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 1569 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 01:50:13,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:50:14,357 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:50:14,359 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:50:15,793 INFO L134 CoverageAnalysis]: Checked inductivity of 48431 backedges. 18003 proven. 126 refuted. 0 times theorem prover too weak. 30302 trivial. 0 not checked. [2020-07-21 01:50:15,793 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:50:15,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:50:18,418 INFO L134 CoverageAnalysis]: Checked inductivity of 48431 backedges. 7043 proven. 11086 refuted. 0 times theorem prover too weak. 30302 trivial. 0 not checked. [2020-07-21 01:50:18,419 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2015647701] [2020-07-21 01:50:18,419 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:50:18,419 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 35 [2020-07-21 01:50:18,420 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [272905135] [2020-07-21 01:50:18,421 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 01:50:18,421 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:50:18,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 01:50:18,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=403, Invalid=787, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 01:50:18,421 INFO L87 Difference]: Start difference. First operand 540 states and 697 transitions. Second operand 35 states. [2020-07-21 01:50:20,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:50:20,809 INFO L93 Difference]: Finished difference Result 695 states and 917 transitions. [2020-07-21 01:50:20,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2020-07-21 01:50:20,810 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 891 [2020-07-21 01:50:20,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:50:20,814 INFO L225 Difference]: With dead ends: 695 [2020-07-21 01:50:20,815 INFO L226 Difference]: Without dead ends: 693 [2020-07-21 01:50:20,816 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1821 GetRequests, 1741 SyntacticMatches, 7 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1731 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1898, Invalid=3652, Unknown=0, NotChecked=0, Total=5550 [2020-07-21 01:50:20,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 693 states. [2020-07-21 01:50:20,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 693 to 610. [2020-07-21 01:50:20,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 610 states. [2020-07-21 01:50:20,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 610 states to 610 states and 799 transitions. [2020-07-21 01:50:20,902 INFO L78 Accepts]: Start accepts. Automaton has 610 states and 799 transitions. Word has length 891 [2020-07-21 01:50:20,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:50:20,903 INFO L479 AbstractCegarLoop]: Abstraction has 610 states and 799 transitions. [2020-07-21 01:50:20,903 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 01:50:20,903 INFO L276 IsEmpty]: Start isEmpty. Operand 610 states and 799 transitions. [2020-07-21 01:50:20,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 934 [2020-07-21 01:50:20,912 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:50:20,913 INFO L422 BasicCegarLoop]: trace histogram [121, 121, 121, 120, 120, 120, 120, 20, 19, 19, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:50:21,125 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:50:21,126 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:50:21,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:50:21,127 INFO L82 PathProgramCache]: Analyzing trace with hash -1311394747, now seen corresponding path program 41 times [2020-07-21 01:50:21,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:50:21,127 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [689415348] [2020-07-21 01:50:21,128 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 [2020-07-21 01:50:21,375 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:50:21,375 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:50:21,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 1641 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 01:50:21,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:50:22,617 INFO L134 CoverageAnalysis]: Checked inductivity of 53462 backedges. 4615 proven. 19121 refuted. 0 times theorem prover too weak. 29726 trivial. 0 not checked. [2020-07-21 01:50:22,618 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:50:24,348 INFO L134 CoverageAnalysis]: Checked inductivity of 53462 backedges. 2325 proven. 19121 refuted. 0 times theorem prover too weak. 32016 trivial. 0 not checked. [2020-07-21 01:50:24,349 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [689415348] [2020-07-21 01:50:24,349 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:50:24,349 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 41 [2020-07-21 01:50:24,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [770244045] [2020-07-21 01:50:24,350 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-07-21 01:50:24,350 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:50:24,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-07-21 01:50:24,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=316, Invalid=1324, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 01:50:24,351 INFO L87 Difference]: Start difference. First operand 610 states and 799 transitions. Second operand 41 states. [2020-07-21 01:50:37,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:50:37,854 INFO L93 Difference]: Finished difference Result 920 states and 1236 transitions. [2020-07-21 01:50:37,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 166 states. [2020-07-21 01:50:37,855 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 933 [2020-07-21 01:50:37,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:50:37,859 INFO L225 Difference]: With dead ends: 920 [2020-07-21 01:50:37,859 INFO L226 Difference]: Without dead ends: 697 [2020-07-21 01:50:37,861 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2024 GetRequests, 1819 SyntacticMatches, 7 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16140 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=8499, Invalid=31301, Unknown=0, NotChecked=0, Total=39800 [2020-07-21 01:50:37,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 697 states. [2020-07-21 01:50:37,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 697 to 643. [2020-07-21 01:50:37,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 643 states. [2020-07-21 01:50:37,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 643 states to 643 states and 843 transitions. [2020-07-21 01:50:37,953 INFO L78 Accepts]: Start accepts. Automaton has 643 states and 843 transitions. Word has length 933 [2020-07-21 01:50:37,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:50:37,954 INFO L479 AbstractCegarLoop]: Abstraction has 643 states and 843 transitions. [2020-07-21 01:50:37,954 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-07-21 01:50:37,954 INFO L276 IsEmpty]: Start isEmpty. Operand 643 states and 843 transitions. [2020-07-21 01:50:37,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1000 [2020-07-21 01:50:37,964 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:50:37,965 INFO L422 BasicCegarLoop]: trace histogram [130, 130, 130, 129, 129, 129, 129, 21, 20, 20, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:50:38,180 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:50:38,181 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:50:38,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:50:38,182 INFO L82 PathProgramCache]: Analyzing trace with hash -874980193, now seen corresponding path program 42 times [2020-07-21 01:50:38,182 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:50:38,183 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [843101668] [2020-07-21 01:50:38,183 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 [2020-07-21 01:50:38,429 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:50:38,429 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:50:38,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 1755 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 01:50:38,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:50:39,701 INFO L134 CoverageAnalysis]: Checked inductivity of 61675 backedges. 28448 proven. 3247 refuted. 0 times theorem prover too weak. 29980 trivial. 0 not checked. [2020-07-21 01:50:39,701 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:50:41,779 INFO L134 CoverageAnalysis]: Checked inductivity of 61675 backedges. 13913 proven. 10972 refuted. 0 times theorem prover too weak. 36790 trivial. 0 not checked. [2020-07-21 01:50:41,779 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [843101668] [2020-07-21 01:50:41,779 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:50:41,780 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 39 [2020-07-21 01:50:41,780 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817764609] [2020-07-21 01:50:41,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-07-21 01:50:41,781 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:50:41,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-07-21 01:50:41,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=1171, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 01:50:41,781 INFO L87 Difference]: Start difference. First operand 643 states and 843 transitions. Second operand 39 states. [2020-07-21 01:50:45,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:50:45,516 INFO L93 Difference]: Finished difference Result 912 states and 1233 transitions. [2020-07-21 01:50:45,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2020-07-21 01:50:45,517 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 999 [2020-07-21 01:50:45,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:50:45,521 INFO L225 Difference]: With dead ends: 912 [2020-07-21 01:50:45,521 INFO L226 Difference]: Without dead ends: 715 [2020-07-21 01:50:45,522 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2049 GetRequests, 1953 SyntacticMatches, 7 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1842 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=2273, Invalid=5917, Unknown=0, NotChecked=0, Total=8190 [2020-07-21 01:50:45,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 715 states. [2020-07-21 01:50:45,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 715 to 695. [2020-07-21 01:50:45,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 695 states. [2020-07-21 01:50:45,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 695 states to 695 states and 919 transitions. [2020-07-21 01:50:45,624 INFO L78 Accepts]: Start accepts. Automaton has 695 states and 919 transitions. Word has length 999 [2020-07-21 01:50:45,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:50:45,625 INFO L479 AbstractCegarLoop]: Abstraction has 695 states and 919 transitions. [2020-07-21 01:50:45,625 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-07-21 01:50:45,625 INFO L276 IsEmpty]: Start isEmpty. Operand 695 states and 919 transitions. [2020-07-21 01:50:45,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1007 [2020-07-21 01:50:45,632 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:50:45,632 INFO L422 BasicCegarLoop]: trace histogram [131, 131, 131, 130, 130, 130, 130, 21, 20, 20, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:50:45,833 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:50:45,833 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:50:45,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:50:45,834 INFO L82 PathProgramCache]: Analyzing trace with hash -1744475458, now seen corresponding path program 43 times [2020-07-21 01:50:45,835 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:50:45,835 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [432191954] [2020-07-21 01:50:45,835 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 [2020-07-21 01:50:46,079 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:50:46,080 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:50:46,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 1767 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 01:50:46,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:50:47,563 INFO L134 CoverageAnalysis]: Checked inductivity of 62602 backedges. 4166 proven. 23316 refuted. 0 times theorem prover too weak. 35120 trivial. 0 not checked. [2020-07-21 01:50:47,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:50:49,774 INFO L134 CoverageAnalysis]: Checked inductivity of 62602 backedges. 2158 proven. 23316 refuted. 0 times theorem prover too weak. 37128 trivial. 0 not checked. [2020-07-21 01:50:49,775 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [432191954] [2020-07-21 01:50:49,775 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:50:49,775 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 45 [2020-07-21 01:50:49,775 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076981360] [2020-07-21 01:50:49,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-07-21 01:50:49,776 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:50:49,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-07-21 01:50:49,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=375, Invalid=1605, Unknown=0, NotChecked=0, Total=1980 [2020-07-21 01:50:49,777 INFO L87 Difference]: Start difference. First operand 695 states and 919 transitions. Second operand 45 states. [2020-07-21 01:51:08,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:51:08,953 INFO L93 Difference]: Finished difference Result 1187 states and 1603 transitions. [2020-07-21 01:51:08,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 185 states. [2020-07-21 01:51:08,956 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 1006 [2020-07-21 01:51:08,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:51:08,960 INFO L225 Difference]: With dead ends: 1187 [2020-07-21 01:51:08,960 INFO L226 Difference]: Without dead ends: 873 [2020-07-21 01:51:08,964 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2190 GetRequests, 1961 SyntacticMatches, 7 SemanticMatches, 222 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20395 ImplicationChecksByTransitivity, 15.5s TimeCoverageRelationStatistics Valid=11282, Invalid=38670, Unknown=0, NotChecked=0, Total=49952 [2020-07-21 01:51:08,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 873 states. [2020-07-21 01:51:09,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 873 to 733. [2020-07-21 01:51:09,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 733 states. [2020-07-21 01:51:09,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 733 states to 733 states and 971 transitions. [2020-07-21 01:51:09,091 INFO L78 Accepts]: Start accepts. Automaton has 733 states and 971 transitions. Word has length 1006 [2020-07-21 01:51:09,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:51:09,091 INFO L479 AbstractCegarLoop]: Abstraction has 733 states and 971 transitions. [2020-07-21 01:51:09,092 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-07-21 01:51:09,092 INFO L276 IsEmpty]: Start isEmpty. Operand 733 states and 971 transitions. [2020-07-21 01:51:09,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1083 [2020-07-21 01:51:09,102 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:51:09,103 INFO L422 BasicCegarLoop]: trace histogram [141, 141, 141, 140, 140, 140, 140, 22, 21, 21, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:51:09,303 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:51:09,304 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:51:09,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:51:09,305 INFO L82 PathProgramCache]: Analyzing trace with hash 2076739844, now seen corresponding path program 44 times [2020-07-21 01:51:09,305 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:51:09,305 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1366337141] [2020-07-21 01:51:09,306 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 [2020-07-21 01:51:09,568 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:51:09,568 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:51:09,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 1899 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 01:51:09,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:51:11,280 INFO L134 CoverageAnalysis]: Checked inductivity of 72506 backedges. 33214 proven. 3930 refuted. 0 times theorem prover too weak. 35362 trivial. 0 not checked. [2020-07-21 01:51:11,280 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:51:13,957 INFO L134 CoverageAnalysis]: Checked inductivity of 72506 backedges. 15493 proven. 14181 refuted. 0 times theorem prover too weak. 42832 trivial. 0 not checked. [2020-07-21 01:51:13,958 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1366337141] [2020-07-21 01:51:13,958 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:51:13,958 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 43 [2020-07-21 01:51:13,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059611934] [2020-07-21 01:51:13,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-07-21 01:51:13,959 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:51:13,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-07-21 01:51:13,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=373, Invalid=1433, Unknown=0, NotChecked=0, Total=1806 [2020-07-21 01:51:13,960 INFO L87 Difference]: Start difference. First operand 733 states and 971 transitions. Second operand 43 states. [2020-07-21 01:51:19,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:51:19,690 INFO L93 Difference]: Finished difference Result 1089 states and 1483 transitions. [2020-07-21 01:51:19,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2020-07-21 01:51:19,692 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 1082 [2020-07-21 01:51:19,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:51:19,697 INFO L225 Difference]: With dead ends: 1089 [2020-07-21 01:51:19,697 INFO L226 Difference]: Without dead ends: 804 [2020-07-21 01:51:19,699 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2226 GetRequests, 2115 SyntacticMatches, 7 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2563 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=3117, Invalid=8013, Unknown=0, NotChecked=0, Total=11130 [2020-07-21 01:51:19,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 804 states. [2020-07-21 01:51:19,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 804 to 785. [2020-07-21 01:51:19,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 785 states. [2020-07-21 01:51:19,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 785 states to 785 states and 1046 transitions. [2020-07-21 01:51:19,825 INFO L78 Accepts]: Start accepts. Automaton has 785 states and 1046 transitions. Word has length 1082 [2020-07-21 01:51:19,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:51:19,826 INFO L479 AbstractCegarLoop]: Abstraction has 785 states and 1046 transitions. [2020-07-21 01:51:19,826 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-07-21 01:51:19,826 INFO L276 IsEmpty]: Start isEmpty. Operand 785 states and 1046 transitions. [2020-07-21 01:51:19,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1090 [2020-07-21 01:51:19,835 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:51:19,836 INFO L422 BasicCegarLoop]: trace histogram [142, 142, 142, 141, 141, 141, 141, 22, 21, 21, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:51:20,050 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:51:20,051 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:51:20,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:51:20,052 INFO L82 PathProgramCache]: Analyzing trace with hash -690954159, now seen corresponding path program 45 times [2020-07-21 01:51:20,052 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:51:20,053 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2061066628] [2020-07-21 01:51:20,053 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 [2020-07-21 01:51:20,319 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:51:20,319 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:51:20,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 1911 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 01:51:20,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:51:21,403 INFO L134 CoverageAnalysis]: Checked inductivity of 73511 backedges. 8093 proven. 22813 refuted. 0 times theorem prover too weak. 42605 trivial. 0 not checked. [2020-07-21 01:51:21,403 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:51:23,556 INFO L134 CoverageAnalysis]: Checked inductivity of 73511 backedges. 3853 proven. 22813 refuted. 0 times theorem prover too weak. 46845 trivial. 0 not checked. [2020-07-21 01:51:23,556 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2061066628] [2020-07-21 01:51:23,556 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:51:23,556 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 28 [2020-07-21 01:51:23,557 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [847669103] [2020-07-21 01:51:23,558 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-21 01:51:23,558 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:51:23,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-21 01:51:23,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=581, Unknown=0, NotChecked=0, Total=756 [2020-07-21 01:51:23,558 INFO L87 Difference]: Start difference. First operand 785 states and 1046 transitions. Second operand 28 states. [2020-07-21 01:51:30,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:51:30,919 INFO L93 Difference]: Finished difference Result 1700 states and 2319 transitions. [2020-07-21 01:51:30,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2020-07-21 01:51:30,921 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 1089 [2020-07-21 01:51:30,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:51:30,927 INFO L225 Difference]: With dead ends: 1700 [2020-07-21 01:51:30,927 INFO L226 Difference]: Without dead ends: 1392 [2020-07-21 01:51:30,930 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2270 GetRequests, 2143 SyntacticMatches, 8 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5615 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=3057, Invalid=11463, Unknown=0, NotChecked=0, Total=14520 [2020-07-21 01:51:30,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1392 states. [2020-07-21 01:51:31,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1392 to 984. [2020-07-21 01:51:31,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 984 states. [2020-07-21 01:51:31,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 984 states to 984 states and 1306 transitions. [2020-07-21 01:51:31,094 INFO L78 Accepts]: Start accepts. Automaton has 984 states and 1306 transitions. Word has length 1089 [2020-07-21 01:51:31,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:51:31,094 INFO L479 AbstractCegarLoop]: Abstraction has 984 states and 1306 transitions. [2020-07-21 01:51:31,094 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-21 01:51:31,095 INFO L276 IsEmpty]: Start isEmpty. Operand 984 states and 1306 transitions. [2020-07-21 01:51:31,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1135 [2020-07-21 01:51:31,103 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:51:31,104 INFO L422 BasicCegarLoop]: trace histogram [148, 148, 148, 147, 147, 147, 147, 23, 22, 22, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:51:31,317 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:51:31,318 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:51:31,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:51:31,319 INFO L82 PathProgramCache]: Analyzing trace with hash -944230286, now seen corresponding path program 46 times [2020-07-21 01:51:31,320 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:51:31,320 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [184301203] [2020-07-21 01:51:31,321 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 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 [2020-07-21 01:51:31,597 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:51:31,598 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:51:31,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 1989 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 01:51:31,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:51:32,684 INFO L134 CoverageAnalysis]: Checked inductivity of 79907 backedges. 34663 proven. 2592 refuted. 0 times theorem prover too weak. 42652 trivial. 0 not checked. [2020-07-21 01:51:32,685 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:51:35,065 INFO L134 CoverageAnalysis]: Checked inductivity of 79907 backedges. 26745 proven. 2620 refuted. 0 times theorem prover too weak. 50542 trivial. 0 not checked. [2020-07-21 01:51:35,066 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [184301203] [2020-07-21 01:51:35,066 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:51:35,066 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 26 [2020-07-21 01:51:35,066 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [655424230] [2020-07-21 01:51:35,067 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 01:51:35,067 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:51:35,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 01:51:35,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=494, Unknown=0, NotChecked=0, Total=650 [2020-07-21 01:51:35,068 INFO L87 Difference]: Start difference. First operand 984 states and 1306 transitions. Second operand 26 states. [2020-07-21 01:51:37,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:51:37,082 INFO L93 Difference]: Finished difference Result 1307 states and 1766 transitions. [2020-07-21 01:51:37,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-21 01:51:37,084 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 1134 [2020-07-21 01:51:37,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:51:37,089 INFO L225 Difference]: With dead ends: 1307 [2020-07-21 01:51:37,089 INFO L226 Difference]: Without dead ends: 810 [2020-07-21 01:51:37,091 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2284 GetRequests, 2235 SyntacticMatches, 8 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=502, Invalid=1304, Unknown=0, NotChecked=0, Total=1806 [2020-07-21 01:51:37,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 810 states. [2020-07-21 01:51:37,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 810 to 810. [2020-07-21 01:51:37,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 810 states. [2020-07-21 01:51:37,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 810 states to 810 states and 1076 transitions. [2020-07-21 01:51:37,219 INFO L78 Accepts]: Start accepts. Automaton has 810 states and 1076 transitions. Word has length 1134 [2020-07-21 01:51:37,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:51:37,220 INFO L479 AbstractCegarLoop]: Abstraction has 810 states and 1076 transitions. [2020-07-21 01:51:37,220 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 01:51:37,220 INFO L276 IsEmpty]: Start isEmpty. Operand 810 states and 1076 transitions. [2020-07-21 01:51:37,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1142 [2020-07-21 01:51:37,229 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:51:37,230 INFO L422 BasicCegarLoop]: trace histogram [149, 149, 149, 148, 148, 148, 148, 23, 22, 22, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:51:37,430 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:51:37,431 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:51:37,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:51:37,432 INFO L82 PathProgramCache]: Analyzing trace with hash -211111029, now seen corresponding path program 47 times [2020-07-21 01:51:37,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:51:37,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [300792043] [2020-07-21 01:51:37,433 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 01:51:37,715 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:51:37,716 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:51:37,721 INFO L263 TraceCheckSpWp]: Trace formula consists of 2001 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 01:51:37,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:51:39,047 INFO L134 CoverageAnalysis]: Checked inductivity of 80962 backedges. 7585 proven. 26386 refuted. 0 times theorem prover too weak. 46991 trivial. 0 not checked. [2020-07-21 01:51:39,047 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:51:41,586 INFO L134 CoverageAnalysis]: Checked inductivity of 80962 backedges. 3651 proven. 26386 refuted. 0 times theorem prover too weak. 50925 trivial. 0 not checked. [2020-07-21 01:51:41,586 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [300792043] [2020-07-21 01:51:41,586 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:51:41,587 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 32 [2020-07-21 01:51:41,587 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143897666] [2020-07-21 01:51:41,588 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-21 01:51:41,588 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:51:41,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-21 01:51:41,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=779, Unknown=0, NotChecked=0, Total=992 [2020-07-21 01:51:41,588 INFO L87 Difference]: Start difference. First operand 810 states and 1076 transitions. Second operand 32 states. [2020-07-21 01:51:56,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:51:56,395 INFO L93 Difference]: Finished difference Result 1339 states and 1834 transitions. [2020-07-21 01:51:56,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 155 states. [2020-07-21 01:51:56,398 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 1141 [2020-07-21 01:51:56,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:51:56,403 INFO L225 Difference]: With dead ends: 1339 [2020-07-21 01:51:56,403 INFO L226 Difference]: Without dead ends: 1021 [2020-07-21 01:51:56,406 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2427 GetRequests, 2243 SyntacticMatches, 8 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13489 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=6498, Invalid=25008, Unknown=0, NotChecked=0, Total=31506 [2020-07-21 01:51:56,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1021 states. [2020-07-21 01:51:56,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1021 to 837. [2020-07-21 01:51:56,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 837 states. [2020-07-21 01:51:56,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 837 states to 837 states and 1112 transitions. [2020-07-21 01:51:56,546 INFO L78 Accepts]: Start accepts. Automaton has 837 states and 1112 transitions. Word has length 1141 [2020-07-21 01:51:56,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:51:56,547 INFO L479 AbstractCegarLoop]: Abstraction has 837 states and 1112 transitions. [2020-07-21 01:51:56,547 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-21 01:51:56,547 INFO L276 IsEmpty]: Start isEmpty. Operand 837 states and 1112 transitions. [2020-07-21 01:51:56,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1194 [2020-07-21 01:51:56,557 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:51:56,557 INFO L422 BasicCegarLoop]: trace histogram [156, 156, 156, 155, 155, 155, 155, 24, 23, 23, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:51:56,758 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:51:56,758 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:51:56,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:51:56,760 INFO L82 PathProgramCache]: Analyzing trace with hash -2061681211, now seen corresponding path program 48 times [2020-07-21 01:51:56,760 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:51:56,760 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1048948082] [2020-07-21 01:51:56,760 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 [2020-07-21 01:51:57,055 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:51:57,055 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:51:57,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 2091 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 01:51:57,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:51:58,377 INFO L134 CoverageAnalysis]: Checked inductivity of 88773 backedges. 38543 proven. 3172 refuted. 0 times theorem prover too weak. 47058 trivial. 0 not checked. [2020-07-21 01:51:58,377 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:52:01,171 INFO L134 CoverageAnalysis]: Checked inductivity of 88773 backedges. 27156 proven. 6189 refuted. 0 times theorem prover too weak. 55428 trivial. 0 not checked. [2020-07-21 01:52:01,171 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1048948082] [2020-07-21 01:52:01,171 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:52:01,172 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 30 [2020-07-21 01:52:01,172 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989415412] [2020-07-21 01:52:01,173 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-21 01:52:01,173 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:52:01,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-21 01:52:01,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=672, Unknown=0, NotChecked=0, Total=870 [2020-07-21 01:52:01,174 INFO L87 Difference]: Start difference. First operand 837 states and 1112 transitions. Second operand 30 states. [2020-07-21 01:52:04,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:52:04,240 INFO L93 Difference]: Finished difference Result 1138 states and 1543 transitions. [2020-07-21 01:52:04,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-07-21 01:52:04,243 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 1193 [2020-07-21 01:52:04,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:52:04,248 INFO L225 Difference]: With dead ends: 1138 [2020-07-21 01:52:04,248 INFO L226 Difference]: Without dead ends: 837 [2020-07-21 01:52:04,249 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2413 GetRequests, 2349 SyntacticMatches, 8 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 645 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=911, Invalid=2395, Unknown=0, NotChecked=0, Total=3306 [2020-07-21 01:52:04,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 837 states. [2020-07-21 01:52:04,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 837 to 837. [2020-07-21 01:52:04,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 837 states. [2020-07-21 01:52:04,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 837 states to 837 states and 1110 transitions. [2020-07-21 01:52:04,378 INFO L78 Accepts]: Start accepts. Automaton has 837 states and 1110 transitions. Word has length 1193 [2020-07-21 01:52:04,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:52:04,379 INFO L479 AbstractCegarLoop]: Abstraction has 837 states and 1110 transitions. [2020-07-21 01:52:04,379 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-21 01:52:04,379 INFO L276 IsEmpty]: Start isEmpty. Operand 837 states and 1110 transitions. [2020-07-21 01:52:04,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1201 [2020-07-21 01:52:04,390 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:52:04,391 INFO L422 BasicCegarLoop]: trace histogram [157, 157, 157, 156, 156, 156, 156, 24, 23, 23, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:52:04,591 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:52:04,591 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:52:04,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:52:04,593 INFO L82 PathProgramCache]: Analyzing trace with hash 1739494104, now seen corresponding path program 49 times [2020-07-21 01:52:04,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:52:04,594 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1838192337] [2020-07-21 01:52:04,594 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 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 [2020-07-21 01:52:04,888 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:52:04,888 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:52:04,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 2103 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 01:52:04,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:52:06,498 INFO L134 CoverageAnalysis]: Checked inductivity of 89885 backedges. 7011 proven. 30616 refuted. 0 times theorem prover too weak. 52258 trivial. 0 not checked. [2020-07-21 01:52:06,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:52:09,516 INFO L134 CoverageAnalysis]: Checked inductivity of 89885 backedges. 3423 proven. 30616 refuted. 0 times theorem prover too weak. 55846 trivial. 0 not checked. [2020-07-21 01:52:09,516 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1838192337] [2020-07-21 01:52:09,516 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:52:09,517 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 36 [2020-07-21 01:52:09,517 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568647986] [2020-07-21 01:52:09,518 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 01:52:09,518 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:52:09,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 01:52:09,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=1003, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 01:52:09,518 INFO L87 Difference]: Start difference. First operand 837 states and 1110 transitions. Second operand 36 states. [2020-07-21 01:52:32,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:52:32,754 INFO L93 Difference]: Finished difference Result 1323 states and 1801 transitions. [2020-07-21 01:52:32,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 190 states. [2020-07-21 01:52:32,757 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 1200 [2020-07-21 01:52:32,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:52:32,763 INFO L225 Difference]: With dead ends: 1323 [2020-07-21 01:52:32,763 INFO L226 Difference]: Without dead ends: 1002 [2020-07-21 01:52:32,769 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2581 GetRequests, 2357 SyntacticMatches, 8 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20752 ImplicationChecksByTransitivity, 18.5s TimeCoverageRelationStatistics Valid=9652, Invalid=37654, Unknown=0, NotChecked=0, Total=47306 [2020-07-21 01:52:32,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1002 states. [2020-07-21 01:52:32,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1002 to 867. [2020-07-21 01:52:32,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 867 states. [2020-07-21 01:52:32,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 867 states to 867 states and 1150 transitions. [2020-07-21 01:52:32,909 INFO L78 Accepts]: Start accepts. Automaton has 867 states and 1150 transitions. Word has length 1200 [2020-07-21 01:52:32,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:52:32,910 INFO L479 AbstractCegarLoop]: Abstraction has 867 states and 1150 transitions. [2020-07-21 01:52:32,910 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 01:52:32,910 INFO L276 IsEmpty]: Start isEmpty. Operand 867 states and 1150 transitions. [2020-07-21 01:52:32,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1260 [2020-07-21 01:52:32,924 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:52:32,925 INFO L422 BasicCegarLoop]: trace histogram [165, 165, 165, 164, 164, 164, 164, 25, 24, 24, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:52:33,125 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:52:33,126 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:52:33,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:52:33,127 INFO L82 PathProgramCache]: Analyzing trace with hash -891846805, now seen corresponding path program 50 times [2020-07-21 01:52:33,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:52:33,128 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1626319472] [2020-07-21 01:52:33,128 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 [2020-07-21 01:52:33,436 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:52:33,437 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:52:33,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 2205 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 01:52:33,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:52:35,114 INFO L134 CoverageAnalysis]: Checked inductivity of 99275 backedges. 43117 proven. 3824 refuted. 0 times theorem prover too weak. 52334 trivial. 0 not checked. [2020-07-21 01:52:35,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:52:38,517 INFO L134 CoverageAnalysis]: Checked inductivity of 99275 backedges. 27802 proven. 10229 refuted. 0 times theorem prover too weak. 61244 trivial. 0 not checked. [2020-07-21 01:52:38,518 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1626319472] [2020-07-21 01:52:38,518 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:52:38,518 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 34 [2020-07-21 01:52:38,518 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609997424] [2020-07-21 01:52:38,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-21 01:52:38,520 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:52:38,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-21 01:52:38,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=876, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 01:52:38,520 INFO L87 Difference]: Start difference. First operand 867 states and 1150 transitions. Second operand 34 states. [2020-07-21 01:52:42,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:52:42,345 INFO L93 Difference]: Finished difference Result 1168 states and 1580 transitions. [2020-07-21 01:52:42,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-21 01:52:42,348 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 1259 [2020-07-21 01:52:42,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:52:42,352 INFO L225 Difference]: With dead ends: 1168 [2020-07-21 01:52:42,352 INFO L226 Difference]: Without dead ends: 867 [2020-07-21 01:52:42,354 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2555 GetRequests, 2477 SyntacticMatches, 8 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1073 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=1406, Invalid=3706, Unknown=0, NotChecked=0, Total=5112 [2020-07-21 01:52:42,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 867 states. [2020-07-21 01:52:42,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 867 to 867. [2020-07-21 01:52:42,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 867 states. [2020-07-21 01:52:42,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 867 states to 867 states and 1148 transitions. [2020-07-21 01:52:42,493 INFO L78 Accepts]: Start accepts. Automaton has 867 states and 1148 transitions. Word has length 1259 [2020-07-21 01:52:42,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:52:42,494 INFO L479 AbstractCegarLoop]: Abstraction has 867 states and 1148 transitions. [2020-07-21 01:52:42,494 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-21 01:52:42,494 INFO L276 IsEmpty]: Start isEmpty. Operand 867 states and 1148 transitions. [2020-07-21 01:52:42,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1267 [2020-07-21 01:52:42,504 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:52:42,505 INFO L422 BasicCegarLoop]: trace histogram [166, 166, 166, 165, 165, 165, 165, 25, 24, 24, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:52:42,705 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:52:42,706 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:52:42,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:52:42,707 INFO L82 PathProgramCache]: Analyzing trace with hash -1524872590, now seen corresponding path program 51 times [2020-07-21 01:52:42,707 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:52:42,707 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [992847189] [2020-07-21 01:52:42,708 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 [2020-07-21 01:52:43,015 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:52:43,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:52:43,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 2217 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 01:52:43,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:52:44,970 INFO L134 CoverageAnalysis]: Checked inductivity of 100451 backedges. 6350 proven. 35584 refuted. 0 times theorem prover too weak. 58517 trivial. 0 not checked. [2020-07-21 01:52:44,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:52:48,568 INFO L134 CoverageAnalysis]: Checked inductivity of 100451 backedges. 3160 proven. 35584 refuted. 0 times theorem prover too weak. 61707 trivial. 0 not checked. [2020-07-21 01:52:48,568 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [992847189] [2020-07-21 01:52:48,568 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:52:48,569 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 40 [2020-07-21 01:52:48,569 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1634460267] [2020-07-21 01:52:48,570 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-21 01:52:48,570 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:52:48,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-21 01:52:48,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=1253, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 01:52:48,570 INFO L87 Difference]: Start difference. First operand 867 states and 1148 transitions. Second operand 40 states. [2020-07-21 01:53:21,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:53:21,267 INFO L93 Difference]: Finished difference Result 1310 states and 1773 transitions. [2020-07-21 01:53:21,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 215 states. [2020-07-21 01:53:21,270 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 1266 [2020-07-21 01:53:21,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:53:21,277 INFO L225 Difference]: With dead ends: 1310 [2020-07-21 01:53:21,277 INFO L226 Difference]: Without dead ends: 986 [2020-07-21 01:53:21,282 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2738 GetRequests, 2485 SyntacticMatches, 8 SemanticMatches, 245 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26619 ImplicationChecksByTransitivity, 26.1s TimeCoverageRelationStatistics Valid=12065, Invalid=48697, Unknown=0, NotChecked=0, Total=60762 [2020-07-21 01:53:21,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 986 states. [2020-07-21 01:53:21,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 986 to 900. [2020-07-21 01:53:21,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 900 states. [2020-07-21 01:53:21,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 900 states to 900 states and 1192 transitions. [2020-07-21 01:53:21,431 INFO L78 Accepts]: Start accepts. Automaton has 900 states and 1192 transitions. Word has length 1266 [2020-07-21 01:53:21,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:53:21,432 INFO L479 AbstractCegarLoop]: Abstraction has 900 states and 1192 transitions. [2020-07-21 01:53:21,432 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-21 01:53:21,432 INFO L276 IsEmpty]: Start isEmpty. Operand 900 states and 1192 transitions. [2020-07-21 01:53:21,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1333 [2020-07-21 01:53:21,444 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:53:21,444 INFO L422 BasicCegarLoop]: trace histogram [175, 175, 175, 174, 174, 174, 174, 26, 25, 25, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:53:21,645 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:53:21,645 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:53:21,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:53:21,646 INFO L82 PathProgramCache]: Analyzing trace with hash -719015028, now seen corresponding path program 52 times [2020-07-21 01:53:21,647 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:53:21,647 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [39367542] [2020-07-21 01:53:21,647 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 01:53:21,974 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:53:21,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:53:21,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 2331 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 01:53:21,988 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:53:24,039 INFO L134 CoverageAnalysis]: Checked inductivity of 111605 backedges. 48457 proven. 4557 refuted. 0 times theorem prover too weak. 58591 trivial. 0 not checked. [2020-07-21 01:53:24,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:53:28,213 INFO L134 CoverageAnalysis]: Checked inductivity of 111605 backedges. 28755 proven. 14749 refuted. 0 times theorem prover too weak. 68101 trivial. 0 not checked. [2020-07-21 01:53:28,213 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [39367542] [2020-07-21 01:53:28,213 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:53:28,214 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 38 [2020-07-21 01:53:28,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227366435] [2020-07-21 01:53:28,215 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-21 01:53:28,215 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:53:28,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-21 01:53:28,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=1106, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 01:53:28,216 INFO L87 Difference]: Start difference. First operand 900 states and 1192 transitions. Second operand 38 states. [2020-07-21 01:53:35,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:53:35,193 INFO L93 Difference]: Finished difference Result 1201 states and 1621 transitions. [2020-07-21 01:53:35,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-07-21 01:53:35,197 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 1332 [2020-07-21 01:53:35,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:53:35,202 INFO L225 Difference]: With dead ends: 1201 [2020-07-21 01:53:35,202 INFO L226 Difference]: Without dead ends: 900 [2020-07-21 01:53:35,204 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2711 GetRequests, 2619 SyntacticMatches, 8 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1604 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=2005, Invalid=5305, Unknown=0, NotChecked=0, Total=7310 [2020-07-21 01:53:35,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 900 states. [2020-07-21 01:53:35,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 900 to 900. [2020-07-21 01:53:35,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 900 states. [2020-07-21 01:53:35,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 900 states to 900 states and 1190 transitions. [2020-07-21 01:53:35,352 INFO L78 Accepts]: Start accepts. Automaton has 900 states and 1190 transitions. Word has length 1332 [2020-07-21 01:53:35,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:53:35,352 INFO L479 AbstractCegarLoop]: Abstraction has 900 states and 1190 transitions. [2020-07-21 01:53:35,352 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-21 01:53:35,352 INFO L276 IsEmpty]: Start isEmpty. Operand 900 states and 1190 transitions. [2020-07-21 01:53:35,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1340 [2020-07-21 01:53:35,364 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:53:35,365 INFO L422 BasicCegarLoop]: trace histogram [176, 176, 176, 175, 175, 175, 175, 26, 25, 25, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:53:35,565 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:53:35,566 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:53:35,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:53:35,567 INFO L82 PathProgramCache]: Analyzing trace with hash -78422223, now seen corresponding path program 53 times [2020-07-21 01:53:35,567 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:53:35,567 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2066906131] [2020-07-21 01:53:35,568 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 [2020-07-21 01:53:35,898 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:53:35,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:53:35,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 2343 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 01:53:35,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:53:38,238 INFO L134 CoverageAnalysis]: Checked inductivity of 112852 backedges. 5581 proven. 41380 refuted. 0 times theorem prover too weak. 65891 trivial. 0 not checked. [2020-07-21 01:53:38,238 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:53:42,675 INFO L134 CoverageAnalysis]: Checked inductivity of 112852 backedges. 2853 proven. 41380 refuted. 0 times theorem prover too weak. 68619 trivial. 0 not checked. [2020-07-21 01:53:42,675 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2066906131] [2020-07-21 01:53:42,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:53:42,676 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 44 [2020-07-21 01:53:42,676 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077117443] [2020-07-21 01:53:42,677 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-21 01:53:42,677 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:53:42,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-21 01:53:42,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=1529, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 01:53:42,678 INFO L87 Difference]: Start difference. First operand 900 states and 1190 transitions. Second operand 44 states. [2020-07-21 01:54:26,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:54:26,558 INFO L93 Difference]: Finished difference Result 1317 states and 1778 transitions. [2020-07-21 01:54:26,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 234 states. [2020-07-21 01:54:26,562 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 1339 [2020-07-21 01:54:26,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:54:26,568 INFO L225 Difference]: With dead ends: 1317 [2020-07-21 01:54:26,568 INFO L226 Difference]: Without dead ends: 990 [2020-07-21 01:54:26,571 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2904 GetRequests, 2627 SyntacticMatches, 8 SemanticMatches, 269 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32405 ImplicationChecksByTransitivity, 35.3s TimeCoverageRelationStatistics Valid=14907, Invalid=58263, Unknown=0, NotChecked=0, Total=73170 [2020-07-21 01:54:26,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 990 states. [2020-07-21 01:54:26,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 990 to 936. [2020-07-21 01:54:26,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 936 states. [2020-07-21 01:54:26,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 936 states to 936 states and 1238 transitions. [2020-07-21 01:54:26,725 INFO L78 Accepts]: Start accepts. Automaton has 936 states and 1238 transitions. Word has length 1339 [2020-07-21 01:54:26,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:54:26,726 INFO L479 AbstractCegarLoop]: Abstraction has 936 states and 1238 transitions. [2020-07-21 01:54:26,726 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-21 01:54:26,726 INFO L276 IsEmpty]: Start isEmpty. Operand 936 states and 1238 transitions. [2020-07-21 01:54:26,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1413 [2020-07-21 01:54:26,739 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:54:26,740 INFO L422 BasicCegarLoop]: trace histogram [186, 186, 186, 185, 185, 185, 185, 27, 26, 26, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:54:26,940 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:54:26,940 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:54:26,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:54:26,942 INFO L82 PathProgramCache]: Analyzing trace with hash 2025630034, now seen corresponding path program 54 times [2020-07-21 01:54:26,942 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:54:26,942 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1086415789] [2020-07-21 01:54:26,942 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 [2020-07-21 01:54:27,289 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:54:27,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:54:27,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 2469 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 01:54:27,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:54:29,874 INFO L134 CoverageAnalysis]: Checked inductivity of 125976 backedges. 54644 proven. 5380 refuted. 0 times theorem prover too weak. 65952 trivial. 0 not checked. [2020-07-21 01:54:29,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:54:35,222 INFO L134 CoverageAnalysis]: Checked inductivity of 125976 backedges. 30096 proven. 19758 refuted. 0 times theorem prover too weak. 76122 trivial. 0 not checked. [2020-07-21 01:54:35,222 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1086415789] [2020-07-21 01:54:35,222 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:54:35,222 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 42 [2020-07-21 01:54:35,223 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160464975] [2020-07-21 01:54:35,224 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-07-21 01:54:35,224 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:54:35,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-07-21 01:54:35,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=360, Invalid=1362, Unknown=0, NotChecked=0, Total=1722 [2020-07-21 01:54:35,225 INFO L87 Difference]: Start difference. First operand 936 states and 1238 transitions. Second operand 42 states. [2020-07-21 01:54:44,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:54:44,127 INFO L93 Difference]: Finished difference Result 1237 states and 1666 transitions. [2020-07-21 01:54:44,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2020-07-21 01:54:44,131 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 1412 [2020-07-21 01:54:44,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:54:44,137 INFO L225 Difference]: With dead ends: 1237 [2020-07-21 01:54:44,137 INFO L226 Difference]: Without dead ends: 936 [2020-07-21 01:54:44,138 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2882 GetRequests, 2775 SyntacticMatches, 8 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2295 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=2790, Invalid=7310, Unknown=0, NotChecked=0, Total=10100 [2020-07-21 01:54:44,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 936 states. [2020-07-21 01:54:44,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 936 to 887. [2020-07-21 01:54:44,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 887 states. [2020-07-21 01:54:44,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 887 states to 887 states and 1165 transitions. [2020-07-21 01:54:44,294 INFO L78 Accepts]: Start accepts. Automaton has 887 states and 1165 transitions. Word has length 1412 [2020-07-21 01:54:44,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:54:44,295 INFO L479 AbstractCegarLoop]: Abstraction has 887 states and 1165 transitions. [2020-07-21 01:54:44,295 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-07-21 01:54:44,295 INFO L276 IsEmpty]: Start isEmpty. Operand 887 states and 1165 transitions. [2020-07-21 01:54:44,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1420 [2020-07-21 01:54:44,308 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:54:44,308 INFO L422 BasicCegarLoop]: trace histogram [187, 187, 187, 186, 186, 186, 186, 27, 26, 26, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:54:44,509 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:54:44,509 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:54:44,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:54:44,511 INFO L82 PathProgramCache]: Analyzing trace with hash 1207336619, now seen corresponding path program 55 times [2020-07-21 01:54:44,511 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:54:44,511 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [495546209] [2020-07-21 01:54:44,512 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 01:54:44,857 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:54:44,858 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:54:44,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 2481 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 01:54:44,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:54:47,828 INFO L134 CoverageAnalysis]: Checked inductivity of 127301 backedges. 4683 proven. 48103 refuted. 0 times theorem prover too weak. 74515 trivial. 0 not checked. [2020-07-21 01:54:47,828 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:54:53,408 INFO L134 CoverageAnalysis]: Checked inductivity of 127301 backedges. 2493 proven. 48103 refuted. 0 times theorem prover too weak. 76705 trivial. 0 not checked. [2020-07-21 01:54:53,408 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [495546209] [2020-07-21 01:54:53,408 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:54:53,409 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 48 [2020-07-21 01:54:53,409 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [516681518] [2020-07-21 01:54:53,409 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-21 01:54:53,410 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:54:53,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-21 01:54:53,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=425, Invalid=1831, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 01:54:53,410 INFO L87 Difference]: Start difference. First operand 887 states and 1165 transitions. Second operand 48 states. [2020-07-21 01:55:51,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:55:51,225 INFO L93 Difference]: Finished difference Result 1261 states and 1689 transitions. [2020-07-21 01:55:51,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 248 states. [2020-07-21 01:55:51,229 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 1419 [2020-07-21 01:55:51,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:55:51,235 INFO L225 Difference]: With dead ends: 1261 [2020-07-21 01:55:51,235 INFO L226 Difference]: Without dead ends: 980 [2020-07-21 01:55:51,245 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3078 GetRequests, 2783 SyntacticMatches, 8 SemanticMatches, 287 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36629 ImplicationChecksByTransitivity, 46.2s TimeCoverageRelationStatistics Valid=16884, Invalid=66348, Unknown=0, NotChecked=0, Total=83232 [2020-07-21 01:55:51,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 980 states. [2020-07-21 01:55:51,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 980 to 926. [2020-07-21 01:55:51,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 926 states. [2020-07-21 01:55:51,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 926 states to 926 states and 1217 transitions. [2020-07-21 01:55:51,439 INFO L78 Accepts]: Start accepts. Automaton has 926 states and 1217 transitions. Word has length 1419 [2020-07-21 01:55:51,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:55:51,440 INFO L479 AbstractCegarLoop]: Abstraction has 926 states and 1217 transitions. [2020-07-21 01:55:51,440 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-21 01:55:51,440 INFO L276 IsEmpty]: Start isEmpty. Operand 926 states and 1217 transitions. [2020-07-21 01:55:51,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1500 [2020-07-21 01:55:51,454 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:55:51,455 INFO L422 BasicCegarLoop]: trace histogram [198, 198, 198, 197, 197, 197, 197, 28, 27, 27, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:55:51,655 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:55:51,656 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:55:51,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:55:51,657 INFO L82 PathProgramCache]: Analyzing trace with hash 30841381, now seen corresponding path program 56 times [2020-07-21 01:55:51,657 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:55:51,658 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [772446483] [2020-07-21 01:55:51,658 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 [2020-07-21 01:55:52,027 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:55:52,027 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:55:52,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 2619 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 01:55:52,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:55:55,639 INFO L134 CoverageAnalysis]: Checked inductivity of 142622 backedges. 61768 proven. 6302 refuted. 0 times theorem prover too weak. 74552 trivial. 0 not checked. [2020-07-21 01:55:55,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:56:02,228 INFO L134 CoverageAnalysis]: Checked inductivity of 142622 backedges. 31915 proven. 25265 refuted. 0 times theorem prover too weak. 85442 trivial. 0 not checked. [2020-07-21 01:56:02,229 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [772446483] [2020-07-21 01:56:02,229 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:56:02,229 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 46 [2020-07-21 01:56:02,229 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646664492] [2020-07-21 01:56:02,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-07-21 01:56:02,230 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:56:02,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-07-21 01:56:02,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=426, Invalid=1644, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 01:56:02,231 INFO L87 Difference]: Start difference. First operand 926 states and 1217 transitions. Second operand 46 states. [2020-07-21 01:56:15,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:56:15,318 INFO L93 Difference]: Finished difference Result 1244 states and 1672 transitions. [2020-07-21 01:56:15,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2020-07-21 01:56:15,322 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 1499 [2020-07-21 01:56:15,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:56:15,327 INFO L225 Difference]: With dead ends: 1244 [2020-07-21 01:56:15,327 INFO L226 Difference]: Without dead ends: 992 [2020-07-21 01:56:15,329 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3068 GetRequests, 2945 SyntacticMatches, 8 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3199 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=3768, Invalid=9804, Unknown=0, NotChecked=0, Total=13572 [2020-07-21 01:56:15,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 992 states. [2020-07-21 01:56:15,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 992 to 978. [2020-07-21 01:56:15,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 978 states. [2020-07-21 01:56:15,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 978 states to 978 states and 1291 transitions. [2020-07-21 01:56:15,588 INFO L78 Accepts]: Start accepts. Automaton has 978 states and 1291 transitions. Word has length 1499 [2020-07-21 01:56:15,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:56:15,589 INFO L479 AbstractCegarLoop]: Abstraction has 978 states and 1291 transitions. [2020-07-21 01:56:15,589 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-07-21 01:56:15,589 INFO L276 IsEmpty]: Start isEmpty. Operand 978 states and 1291 transitions. [2020-07-21 01:56:15,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1507 [2020-07-21 01:56:15,603 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:56:15,604 INFO L422 BasicCegarLoop]: trace histogram [199, 199, 199, 198, 198, 198, 198, 28, 27, 27, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:56:15,804 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:56:15,805 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:56:15,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:56:15,806 INFO L82 PathProgramCache]: Analyzing trace with hash -1184462216, now seen corresponding path program 57 times [2020-07-21 01:56:15,807 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:56:15,807 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2635664] [2020-07-21 01:56:15,808 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 [2020-07-21 01:56:16,176 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:56:16,176 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:56:16,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 2631 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-21 01:56:16,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:56:19,774 INFO L134 CoverageAnalysis]: Checked inductivity of 144032 backedges. 3635 proven. 55861 refuted. 0 times theorem prover too weak. 84536 trivial. 0 not checked. [2020-07-21 01:56:19,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:56:26,811 INFO L134 CoverageAnalysis]: Checked inductivity of 144032 backedges. 2071 proven. 55861 refuted. 0 times theorem prover too weak. 86100 trivial. 0 not checked. [2020-07-21 01:56:26,812 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2635664] [2020-07-21 01:56:26,812 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:56:26,812 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 52 [2020-07-21 01:56:26,812 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1848389299] [2020-07-21 01:56:26,813 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-07-21 01:56:26,813 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:56:26,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-07-21 01:56:26,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=493, Invalid=2159, Unknown=0, NotChecked=0, Total=2652 [2020-07-21 01:56:26,813 INFO L87 Difference]: Start difference. First operand 978 states and 1291 transitions. Second operand 52 states. [2020-07-21 01:57:08,226 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 01:57:35,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:57:35,687 INFO L93 Difference]: Finished difference Result 1607 states and 2160 transitions. [2020-07-21 01:57:35,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 267 states. [2020-07-21 01:57:35,694 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 1506 [2020-07-21 01:57:35,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:57:35,698 INFO L225 Difference]: With dead ends: 1607 [2020-07-21 01:57:35,698 INFO L226 Difference]: Without dead ends: 1216 [2020-07-21 01:57:35,707 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3272 GetRequests, 2953 SyntacticMatches, 8 SemanticMatches, 311 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43103 ImplicationChecksByTransitivity, 55.8s TimeCoverageRelationStatistics Valid=21324, Invalid=76332, Unknown=0, NotChecked=0, Total=97656 [2020-07-21 01:57:35,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1216 states. [2020-07-21 01:57:35,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1216 to 1022. [2020-07-21 01:57:35,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1022 states. [2020-07-21 01:57:35,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1022 states to 1022 states and 1351 transitions. [2020-07-21 01:57:35,897 INFO L78 Accepts]: Start accepts. Automaton has 1022 states and 1351 transitions. Word has length 1506 [2020-07-21 01:57:35,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:57:35,898 INFO L479 AbstractCegarLoop]: Abstraction has 1022 states and 1351 transitions. [2020-07-21 01:57:35,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-07-21 01:57:35,898 INFO L276 IsEmpty]: Start isEmpty. Operand 1022 states and 1351 transitions. [2020-07-21 01:57:35,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1597 [2020-07-21 01:57:35,914 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:57:35,915 INFO L422 BasicCegarLoop]: trace histogram [211, 211, 211, 210, 210, 210, 210, 29, 28, 28, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:57:36,115 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:57:36,116 INFO L427 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:57:36,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:57:36,117 INFO L82 PathProgramCache]: Analyzing trace with hash 458941342, now seen corresponding path program 58 times [2020-07-21 01:57:36,118 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:57:36,118 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [266757107] [2020-07-21 01:57:36,118 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 [2020-07-21 01:57:36,576 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:57:36,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:57:36,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 2787 conjuncts, 29 conjunts are in the unsatisfiable core [2020-07-21 01:57:36,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:57:40,574 INFO L134 CoverageAnalysis]: Checked inductivity of 161849 backedges. 69978 proven. 7332 refuted. 0 times theorem prover too weak. 84539 trivial. 0 not checked. [2020-07-21 01:57:40,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:57:48,939 INFO L134 CoverageAnalysis]: Checked inductivity of 161849 backedges. 34361 proven. 31279 refuted. 0 times theorem prover too weak. 96209 trivial. 0 not checked. [2020-07-21 01:57:48,940 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [266757107] [2020-07-21 01:57:48,940 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:57:48,940 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 50 [2020-07-21 01:57:48,940 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562922131] [2020-07-21 01:57:48,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-21 01:57:48,941 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:57:48,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-21 01:57:48,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=1952, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 01:57:48,942 INFO L87 Difference]: Start difference. First operand 1022 states and 1351 transitions. Second operand 50 states. [2020-07-21 01:58:07,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:58:07,156 INFO L93 Difference]: Finished difference Result 1433 states and 1934 transitions. [2020-07-21 01:58:07,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2020-07-21 01:58:07,161 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 1596 [2020-07-21 01:58:07,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:58:07,165 INFO L225 Difference]: With dead ends: 1433 [2020-07-21 01:58:07,165 INFO L226 Difference]: Without dead ends: 1087 [2020-07-21 01:58:07,167 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3275 GetRequests, 3135 SyntacticMatches, 8 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4305 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=4995, Invalid=12827, Unknown=0, NotChecked=0, Total=17822 [2020-07-21 01:58:07,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1087 states. [2020-07-21 01:58:07,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1087 to 1074. [2020-07-21 01:58:07,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1074 states. [2020-07-21 01:58:07,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1074 states to 1074 states and 1424 transitions. [2020-07-21 01:58:07,398 INFO L78 Accepts]: Start accepts. Automaton has 1074 states and 1424 transitions. Word has length 1596 [2020-07-21 01:58:07,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:58:07,399 INFO L479 AbstractCegarLoop]: Abstraction has 1074 states and 1424 transitions. [2020-07-21 01:58:07,399 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-21 01:58:07,399 INFO L276 IsEmpty]: Start isEmpty. Operand 1074 states and 1424 transitions. [2020-07-21 01:58:07,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1604 [2020-07-21 01:58:07,415 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:58:07,416 INFO L422 BasicCegarLoop]: trace histogram [212, 212, 212, 211, 211, 211, 211, 29, 28, 28, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:58:07,616 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:58:07,617 INFO L427 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:58:07,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:58:07,618 INFO L82 PathProgramCache]: Analyzing trace with hash -1774566281, now seen corresponding path program 59 times [2020-07-21 01:58:07,618 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:58:07,619 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [269834549] [2020-07-21 01:58:07,619 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 [2020-07-21 01:58:08,012 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:58:08,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:58:08,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 2799 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 01:58:08,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:58:10,521 INFO L134 CoverageAnalysis]: Checked inductivity of 163351 backedges. 10903 proven. 54378 refuted. 0 times theorem prover too weak. 98070 trivial. 0 not checked. [2020-07-21 01:58:10,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:58:17,519 INFO L134 CoverageAnalysis]: Checked inductivity of 163351 backedges. 5205 proven. 54378 refuted. 0 times theorem prover too weak. 103768 trivial. 0 not checked. [2020-07-21 01:58:17,520 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [269834549] [2020-07-21 01:58:17,520 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:58:17,520 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 31 [2020-07-21 01:58:17,520 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667248423] [2020-07-21 01:58:17,521 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 01:58:17,521 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:58:17,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 01:58:17,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=716, Unknown=0, NotChecked=0, Total=930 [2020-07-21 01:58:17,522 INFO L87 Difference]: Start difference. First operand 1074 states and 1424 transitions. Second operand 31 states. [2020-07-21 01:58:37,010 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 01:58:37,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:58:37,768 INFO L93 Difference]: Finished difference Result 2222 states and 3006 transitions. [2020-07-21 01:58:37,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2020-07-21 01:58:37,774 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 1603 [2020-07-21 01:58:37,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:58:37,780 INFO L225 Difference]: With dead ends: 2222 [2020-07-21 01:58:37,780 INFO L226 Difference]: Without dead ends: 1859 [2020-07-21 01:58:37,785 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3321 GetRequests, 3167 SyntacticMatches, 9 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8734 ImplicationChecksByTransitivity, 17.2s TimeCoverageRelationStatistics Valid=4422, Invalid=17040, Unknown=0, NotChecked=0, Total=21462 [2020-07-21 01:58:37,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1859 states. [2020-07-21 01:58:38,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1859 to 1336. [2020-07-21 01:58:38,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1336 states. [2020-07-21 01:58:38,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1336 states to 1336 states and 1767 transitions. [2020-07-21 01:58:38,129 INFO L78 Accepts]: Start accepts. Automaton has 1336 states and 1767 transitions. Word has length 1603 [2020-07-21 01:58:38,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:58:38,130 INFO L479 AbstractCegarLoop]: Abstraction has 1336 states and 1767 transitions. [2020-07-21 01:58:38,130 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 01:58:38,130 INFO L276 IsEmpty]: Start isEmpty. Operand 1336 states and 1767 transitions. [2020-07-21 01:58:38,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1656 [2020-07-21 01:58:38,148 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:58:38,149 INFO L422 BasicCegarLoop]: trace histogram [219, 219, 219, 218, 218, 218, 218, 30, 29, 29, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:58:38,362 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:58:38,363 INFO L427 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:58:38,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:58:38,364 INFO L82 PathProgramCache]: Analyzing trace with hash -463441743, now seen corresponding path program 60 times [2020-07-21 01:58:38,364 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:58:38,365 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2039635176] [2020-07-21 01:58:38,365 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 [2020-07-21 01:58:38,770 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:58:38,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:58:38,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 2889 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 01:58:38,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:58:41,179 INFO L134 CoverageAnalysis]: Checked inductivity of 174373 backedges. 71882 proven. 4606 refuted. 0 times theorem prover too weak. 97885 trivial. 0 not checked. [2020-07-21 01:58:41,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:58:48,799 INFO L134 CoverageAnalysis]: Checked inductivity of 174373 backedges. 59696 proven. 4642 refuted. 0 times theorem prover too weak. 110035 trivial. 0 not checked. [2020-07-21 01:58:48,799 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2039635176] [2020-07-21 01:58:48,800 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:58:48,800 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 29 [2020-07-21 01:58:48,800 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565772860] [2020-07-21 01:58:48,801 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 01:58:48,801 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:58:48,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 01:58:48,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=619, Unknown=0, NotChecked=0, Total=812 [2020-07-21 01:58:48,801 INFO L87 Difference]: Start difference. First operand 1336 states and 1767 transitions. Second operand 29 states. [2020-07-21 01:58:53,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:58:53,424 INFO L93 Difference]: Finished difference Result 1717 states and 2304 transitions. [2020-07-21 01:58:53,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 01:58:53,431 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 1655 [2020-07-21 01:58:53,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:58:53,434 INFO L225 Difference]: With dead ends: 1717 [2020-07-21 01:58:53,434 INFO L226 Difference]: Without dead ends: 1102 [2020-07-21 01:58:53,437 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3329 GetRequests, 3273 SyntacticMatches, 9 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 468 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=643, Invalid=1709, Unknown=0, NotChecked=0, Total=2352 [2020-07-21 01:58:53,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1102 states. [2020-07-21 01:58:53,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1102 to 1102. [2020-07-21 01:58:53,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1102 states. [2020-07-21 01:58:53,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1102 states to 1102 states and 1458 transitions. [2020-07-21 01:58:53,715 INFO L78 Accepts]: Start accepts. Automaton has 1102 states and 1458 transitions. Word has length 1655 [2020-07-21 01:58:53,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:58:53,716 INFO L479 AbstractCegarLoop]: Abstraction has 1102 states and 1458 transitions. [2020-07-21 01:58:53,716 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 01:58:53,716 INFO L276 IsEmpty]: Start isEmpty. Operand 1102 states and 1458 transitions. [2020-07-21 01:58:53,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1663 [2020-07-21 01:58:53,734 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:58:53,734 INFO L422 BasicCegarLoop]: trace histogram [220, 220, 220, 219, 219, 219, 219, 30, 29, 29, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:58:53,935 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:58:53,935 INFO L427 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:58:53,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:58:53,937 INFO L82 PathProgramCache]: Analyzing trace with hash -1520140692, now seen corresponding path program 61 times [2020-07-21 01:58:53,937 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:58:53,938 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1696125026] [2020-07-21 01:58:53,938 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 [2020-07-21 01:58:54,345 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:58:54,345 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:58:54,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 2901 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 01:58:54,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:58:57,328 INFO L134 CoverageAnalysis]: Checked inductivity of 175932 backedges. 9882 proven. 60445 refuted. 0 times theorem prover too weak. 105605 trivial. 0 not checked. [2020-07-21 01:58:57,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:59:05,263 INFO L134 CoverageAnalysis]: Checked inductivity of 175932 backedges. 4782 proven. 60445 refuted. 0 times theorem prover too weak. 110705 trivial. 0 not checked. [2020-07-21 01:59:05,263 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1696125026] [2020-07-21 01:59:05,263 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:59:05,264 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 35 [2020-07-21 01:59:05,264 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082722010] [2020-07-21 01:59:05,265 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 01:59:05,265 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:59:05,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 01:59:05,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=935, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 01:59:05,265 INFO L87 Difference]: Start difference. First operand 1102 states and 1458 transitions. Second operand 35 states. [2020-07-21 01:59:05,820 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 15 [2020-07-21 01:59:06,280 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 01:59:06,562 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-21 01:59:07,091 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 01:59:07,559 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 01:59:07,787 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 16 [2020-07-21 01:59:08,030 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 01:59:08,241 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 01:59:08,472 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 01:59:08,713 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 01:59:09,013 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 01:59:10,204 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-21 01:59:10,440 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 01:59:10,690 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 01:59:11,328 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 01:59:11,558 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 01:59:14,206 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 01:59:14,724 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 01:59:15,226 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 01:59:15,432 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 01:59:15,672 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 01:59:15,916 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 01:59:17,793 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 01:59:18,060 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 01:59:18,312 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 01:59:18,554 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 01:59:18,789 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-21 01:59:19,041 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 01:59:19,315 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 01:59:19,613 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 01:59:19,926 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 01:59:20,207 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 01:59:20,488 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 01:59:20,746 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 01:59:20,977 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 01:59:21,233 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 01:59:21,499 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 01:59:26,457 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 01:59:26,715 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 01:59:26,984 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 01:59:27,766 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 01:59:28,084 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 01:59:28,415 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 01:59:28,722 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 01:59:29,014 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 01:59:29,305 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 01:59:37,251 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-21 01:59:38,228 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 01:59:38,561 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 01:59:38,873 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 01:59:39,155 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 01:59:39,432 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 01:59:39,669 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 01:59:39,938 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 01:59:44,393 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 01:59:45,894 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 01:59:46,361 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 01:59:49,010 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 01:59:49,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:59:49,729 INFO L93 Difference]: Finished difference Result 1744 states and 2368 transitions. [2020-07-21 01:59:49,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 200 states. [2020-07-21 01:59:49,734 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 1662 [2020-07-21 01:59:49,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:59:49,740 INFO L225 Difference]: With dead ends: 1744 [2020-07-21 01:59:49,741 INFO L226 Difference]: Without dead ends: 1371 [2020-07-21 01:59:49,747 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3514 GetRequests, 3281 SyntacticMatches, 9 SemanticMatches, 224 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23139 ImplicationChecksByTransitivity, 35.8s TimeCoverageRelationStatistics Valid=10275, Invalid=40575, Unknown=0, NotChecked=0, Total=50850 [2020-07-21 01:59:49,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1371 states. [2020-07-21 01:59:50,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1371 to 1132. [2020-07-21 01:59:50,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1132 states. [2020-07-21 01:59:50,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1132 states to 1132 states and 1498 transitions. [2020-07-21 01:59:50,091 INFO L78 Accepts]: Start accepts. Automaton has 1132 states and 1498 transitions. Word has length 1662 [2020-07-21 01:59:50,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:59:50,092 INFO L479 AbstractCegarLoop]: Abstraction has 1132 states and 1498 transitions. [2020-07-21 01:59:50,092 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 01:59:50,092 INFO L276 IsEmpty]: Start isEmpty. Operand 1132 states and 1498 transitions. [2020-07-21 01:59:50,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1722 [2020-07-21 01:59:50,112 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:59:50,113 INFO L422 BasicCegarLoop]: trace histogram [228, 228, 228, 227, 227, 227, 227, 31, 30, 30, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:59:50,314 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:59:50,314 INFO L427 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:59:50,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:59:50,316 INFO L82 PathProgramCache]: Analyzing trace with hash 769935191, now seen corresponding path program 62 times [2020-07-21 01:59:50,316 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:59:50,316 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1893659565] [2020-07-21 01:59:50,317 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 01:59:50,748 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:59:50,748 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:59:50,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 3003 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 01:59:50,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:59:53,736 INFO L134 CoverageAnalysis]: Checked inductivity of 188980 backedges. 78098 proven. 5453 refuted. 0 times theorem prover too weak. 105429 trivial. 0 not checked. [2020-07-21 01:59:53,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 02:00:02,432 INFO L134 CoverageAnalysis]: Checked inductivity of 188980 backedges. 60156 proven. 10705 refuted. 0 times theorem prover too weak. 118119 trivial. 0 not checked. [2020-07-21 02:00:02,433 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1893659565] [2020-07-21 02:00:02,433 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 02:00:02,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 33 [2020-07-21 02:00:02,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482482344] [2020-07-21 02:00:02,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 02:00:02,434 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:00:02,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 02:00:02,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=817, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 02:00:02,435 INFO L87 Difference]: Start difference. First operand 1132 states and 1498 transitions. Second operand 33 states. [2020-07-21 02:00:10,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:00:10,562 INFO L93 Difference]: Finished difference Result 1488 states and 2002 transitions. [2020-07-21 02:00:10,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-21 02:00:10,568 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 1721 [2020-07-21 02:00:10,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:00:10,574 INFO L225 Difference]: With dead ends: 1488 [2020-07-21 02:00:10,574 INFO L226 Difference]: Without dead ends: 1132 [2020-07-21 02:00:10,576 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3473 GetRequests, 3401 SyntacticMatches, 9 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 818 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=1143, Invalid=3017, Unknown=0, NotChecked=0, Total=4160 [2020-07-21 02:00:10,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1132 states. [2020-07-21 02:00:10,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1132 to 1132. [2020-07-21 02:00:10,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1132 states. [2020-07-21 02:00:10,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1132 states to 1132 states and 1496 transitions. [2020-07-21 02:00:10,933 INFO L78 Accepts]: Start accepts. Automaton has 1132 states and 1496 transitions. Word has length 1721 [2020-07-21 02:00:10,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:00:10,935 INFO L479 AbstractCegarLoop]: Abstraction has 1132 states and 1496 transitions. [2020-07-21 02:00:10,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 02:00:10,935 INFO L276 IsEmpty]: Start isEmpty. Operand 1132 states and 1496 transitions. [2020-07-21 02:00:10,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1729 [2020-07-21 02:00:10,967 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:00:10,968 INFO L422 BasicCegarLoop]: trace histogram [229, 229, 229, 228, 228, 228, 228, 31, 30, 30, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:00:11,179 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:00:11,180 INFO L427 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:00:11,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:00:11,181 INFO L82 PathProgramCache]: Analyzing trace with hash -905510650, now seen corresponding path program 63 times [2020-07-21 02:00:11,181 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:00:11,182 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [298045644] [2020-07-21 02:00:11,182 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 [2020-07-21 02:00:11,608 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 02:00:11,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:00:11,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 3015 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 02:00:11,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:00:15,184 INFO L134 CoverageAnalysis]: Checked inductivity of 190603 backedges. 8774 proven. 67445 refuted. 0 times theorem prover too weak. 114384 trivial. 0 not checked. [2020-07-21 02:00:15,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 02:00:24,350 INFO L134 CoverageAnalysis]: Checked inductivity of 190603 backedges. 4324 proven. 67445 refuted. 0 times theorem prover too weak. 118834 trivial. 0 not checked. [2020-07-21 02:00:24,350 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [298045644] [2020-07-21 02:00:24,350 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 02:00:24,351 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 39 [2020-07-21 02:00:24,351 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789669227] [2020-07-21 02:00:24,352 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-07-21 02:00:24,352 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:00:24,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-07-21 02:00:24,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=1180, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 02:00:24,352 INFO L87 Difference]: Start difference. First operand 1132 states and 1496 transitions. Second operand 39 states. [2020-07-21 02:00:25,122 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2020-07-21 02:00:25,353 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 02:00:25,666 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 02:00:25,977 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-21 02:00:26,428 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2020-07-21 02:00:26,679 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 02:00:26,915 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 16 [2020-07-21 02:00:27,197 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 02:00:27,486 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 02:00:27,710 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 02:00:27,996 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 02:00:28,345 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 02:00:28,599 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 02:00:28,823 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 02:00:29,057 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 02:00:29,316 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 02:00:29,584 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 02:00:29,885 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 02:00:30,136 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 02:00:30,419 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 02:00:30,652 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 02:00:30,922 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 16 [2020-07-21 02:00:31,248 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 02:00:31,543 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 02:00:31,798 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 02:00:32,019 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 02:00:32,259 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 02:00:32,512 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 02:00:32,834 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 02:00:33,874 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 02:00:34,372 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 02:00:34,662 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 02:00:34,977 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 02:00:35,237 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 02:00:35,493 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 02:00:35,772 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 02:00:36,001 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 02:00:36,292 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 16 [2020-07-21 02:00:36,633 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 02:00:36,940 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 02:00:37,242 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 02:00:37,518 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 02:00:37,765 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 02:00:38,041 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 02:00:38,337 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-21 02:00:41,107 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 02:00:41,385 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 02:00:41,654 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 02:00:41,916 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 02:00:42,173 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 02:00:42,465 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 02:00:42,764 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 02:00:43,102 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 02:00:43,462 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 02:00:43,762 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 02:00:44,063 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 02:00:44,342 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 02:00:44,652 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 02:00:44,924 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 02:00:45,275 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-21 02:00:45,680 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 02:00:46,044 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 02:00:46,396 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 02:00:46,745 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 02:00:47,067 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 02:00:47,352 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 02:00:47,667 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 02:00:53,522 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 02:00:53,849 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 02:00:54,156 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 02:00:54,443 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 02:00:54,720 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 02:00:54,993 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 02:00:55,292 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 02:00:55,613 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 02:00:56,005 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 02:00:56,425 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 02:00:56,753 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 02:00:57,097 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 02:00:57,423 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-21 02:00:57,718 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 02:00:58,043 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-21 02:00:58,342 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 02:00:58,742 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-21 02:00:59,196 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 02:00:59,630 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 02:01:00,020 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 02:01:00,379 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 02:01:00,731 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 02:01:01,049 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 02:01:01,336 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 02:01:01,699 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 02:01:02,044 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 02:01:09,272 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-21 02:01:09,598 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 02:01:09,887 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 02:01:10,163 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 02:01:10,442 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 02:01:10,733 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 02:01:11,026 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-21 02:01:11,357 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-21 02:01:11,687 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 02:01:12,082 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 02:01:12,524 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 02:01:12,918 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 02:01:13,294 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 02:01:13,635 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 02:01:13,972 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 02:01:14,289 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 02:01:14,644 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 02:01:14,946 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-21 02:01:15,390 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-21 02:01:15,945 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 02:01:16,452 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-21 02:01:16,944 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 02:01:17,396 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 02:01:17,821 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-21 02:01:18,234 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 18 [2020-07-21 02:01:18,610 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 17 [2020-07-21 02:01:18,932 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 02:01:19,301 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-21 02:01:19,658 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 02:01:24,515 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 02:01:24,864 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 16 [2020-07-21 02:01:25,209 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 02:01:25,520 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 02:01:25,831 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-21 02:01:26,157 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 02:01:26,440 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 02:01:26,709 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 16 [2020-07-21 02:01:27,023 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 17 [2020-07-21 02:01:27,337 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 02:01:27,729 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-21 02:01:28,172 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-21 02:01:28,571 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 02:01:28,954 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 02:01:29,303 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 02:01:29,657 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 02:01:30,045 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 02:01:30,401 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-07-21 02:01:30,790 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 02:01:31,098 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 02:01:31,470 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2020-07-21 02:01:31,715 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 02:01:31,968 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-21 02:01:32,479 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 02:01:32,922 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 02:01:33,314 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 02:01:33,711 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 02:01:34,104 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 02:01:34,475 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 02:01:34,851 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 02:01:35,193 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-21 02:01:35,485 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 02:01:35,734 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 02:01:36,175 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 02:01:36,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 02:01:36,681 INFO L93 Difference]: Finished difference Result 1731 states and 2340 transitions. [2020-07-21 02:01:36,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 247 states. [2020-07-21 02:01:36,689 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 1728 [2020-07-21 02:01:36,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 02:01:36,695 INFO L225 Difference]: With dead ends: 1731 [2020-07-21 02:01:36,695 INFO L226 Difference]: Without dead ends: 1355 [2020-07-21 02:01:36,705 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3693 GetRequests, 3409 SyntacticMatches, 9 SemanticMatches, 275 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35578 ImplicationChecksByTransitivity, 58.4s TimeCoverageRelationStatistics Valid=15120, Invalid=61332, Unknown=0, NotChecked=0, Total=76452 [2020-07-21 02:01:36,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1355 states. [2020-07-21 02:01:36,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1355 to 1165. [2020-07-21 02:01:36,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1165 states. [2020-07-21 02:01:36,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1165 states to 1165 states and 1540 transitions. [2020-07-21 02:01:36,939 INFO L78 Accepts]: Start accepts. Automaton has 1165 states and 1540 transitions. Word has length 1728 [2020-07-21 02:01:36,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 02:01:36,940 INFO L479 AbstractCegarLoop]: Abstraction has 1165 states and 1540 transitions. [2020-07-21 02:01:36,940 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-07-21 02:01:36,940 INFO L276 IsEmpty]: Start isEmpty. Operand 1165 states and 1540 transitions. [2020-07-21 02:01:36,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1795 [2020-07-21 02:01:36,964 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 02:01:36,965 INFO L422 BasicCegarLoop]: trace histogram [238, 238, 238, 237, 237, 237, 237, 32, 31, 31, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 02:01:37,166 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 02:01:37,166 INFO L427 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 02:01:37,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 02:01:37,168 INFO L82 PathProgramCache]: Analyzing trace with hash -1318750944, now seen corresponding path program 64 times [2020-07-21 02:01:37,168 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 02:01:37,168 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1758956006] [2020-07-21 02:01:37,169 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 [2020-07-21 02:01:37,669 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 02:01:37,670 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 02:01:37,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 3129 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 02:01:37,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 02:01:41,488 INFO L134 CoverageAnalysis]: Checked inductivity of 205862 backedges. 85275 proven. 6381 refuted. 0 times theorem prover too weak. 114206 trivial. 0 not checked. [2020-07-21 02:01:41,489 INFO L328 TraceCheckSpWp]: Computing backward predicates...