/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/fragtest_simple.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 14:14:12,208 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 14:14:12,211 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 14:14:12,230 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 14:14:12,230 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 14:14:12,233 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 14:14:12,234 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 14:14:12,244 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 14:14:12,246 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 14:14:12,248 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 14:14:12,249 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 14:14:12,250 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 14:14:12,251 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 14:14:12,253 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 14:14:12,254 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 14:14:12,256 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 14:14:12,257 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 14:14:12,260 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 14:14:12,261 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 14:14:12,267 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 14:14:12,270 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 14:14:12,272 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 14:14:12,275 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 14:14:12,275 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 14:14:12,279 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 14:14:12,290 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 14:14:12,291 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 14:14:12,292 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 14:14:12,293 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 14:14:12,327 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 14:14:12,327 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 14:14:12,329 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 14:14:12,329 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 14:14:12,329 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 14:14:12,332 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 14:14:12,332 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 14:14:12,333 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 14:14:12,333 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 14:14:12,333 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 14:14:12,333 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 14:14:12,333 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 14:14:12,334 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 14:14:12,334 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 14:14:12,334 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 14:14:12,335 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 14:14:12,335 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 14:14:12,336 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 14:14:12,336 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 14:14:12,336 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 14:14:12,336 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 14:14:12,336 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 14:14:12,337 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 14:14:12,337 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 14:14:12,337 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 14:14:12,337 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 14:14:12,337 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:12,338 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 14:14:12,338 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 14:14:12,338 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 14:14:12,615 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 14:14:12,633 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 14:14:12,637 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 14:14:12,639 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 14:14:12,639 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 14:14:12,640 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/fragtest_simple.i [2020-07-21 14:14:12,701 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/729163510/69ce2df6385f42c381e5df12f517df6d/FLAG7ce3a5998 [2020-07-21 14:14:13,137 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 14:14:13,138 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/fragtest_simple.i [2020-07-21 14:14:13,145 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/729163510/69ce2df6385f42c381e5df12f517df6d/FLAG7ce3a5998 [2020-07-21 14:14:13,543 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/729163510/69ce2df6385f42c381e5df12f517df6d [2020-07-21 14:14:13,553 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 14:14:13,556 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 14:14:13,557 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 14:14:13,558 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 14:14:13,562 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 14:14:13,563 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:14:13" (1/1) ... [2020-07-21 14:14:13,566 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@30ea4714 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:13, skipping insertion in model container [2020-07-21 14:14:13,566 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:14:13" (1/1) ... [2020-07-21 14:14:13,574 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 14:14:13,592 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 14:14:13,762 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 14:14:13,766 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 14:14:13,786 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 14:14:13,799 INFO L208 MainTranslator]: Completed translation [2020-07-21 14:14:13,800 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:13 WrapperNode [2020-07-21 14:14:13,800 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 14:14:13,801 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 14:14:13,801 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 14:14:13,801 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 14:14:13,811 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:13" (1/1) ... [2020-07-21 14:14:13,811 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:13" (1/1) ... [2020-07-21 14:14:13,816 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:13" (1/1) ... [2020-07-21 14:14:13,816 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:13" (1/1) ... [2020-07-21 14:14:13,900 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:13" (1/1) ... [2020-07-21 14:14:13,906 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:13" (1/1) ... [2020-07-21 14:14:13,907 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:13" (1/1) ... [2020-07-21 14:14:13,909 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 14:14:13,909 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 14:14:13,910 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 14:14:13,910 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 14:14:13,911 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:13" (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 14:14:13,979 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 14:14:13,979 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 14:14:13,979 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 14:14:13,979 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 14:14:13,980 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 14:14:13,980 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 14:14:13,980 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 14:14:13,980 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 14:14:13,981 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 14:14:13,981 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 14:14:13,982 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 14:14:13,982 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 14:14:13,982 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 14:14:14,192 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 14:14:14,193 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-21 14:14:14,197 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:14:14 BoogieIcfgContainer [2020-07-21 14:14:14,197 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 14:14:14,198 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 14:14:14,198 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 14:14:14,201 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 14:14:14,202 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 02:14:13" (1/3) ... [2020-07-21 14:14:14,203 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14773132 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:14:14, skipping insertion in model container [2020-07-21 14:14:14,203 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:13" (2/3) ... [2020-07-21 14:14:14,203 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14773132 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:14:14, skipping insertion in model container [2020-07-21 14:14:14,203 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:14:14" (3/3) ... [2020-07-21 14:14:14,205 INFO L109 eAbstractionObserver]: Analyzing ICFG fragtest_simple.i [2020-07-21 14:14:14,216 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 14:14:14,224 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 14:14:14,241 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 14:14:14,283 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 14:14:14,284 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 14:14:14,284 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 14:14:14,284 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 14:14:14,285 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 14:14:14,285 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 14:14:14,285 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 14:14:14,286 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 14:14:14,311 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-07-21 14:14:14,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 14:14:14,319 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:14,320 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:14,321 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:14,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:14,329 INFO L82 PathProgramCache]: Analyzing trace with hash 317368997, now seen corresponding path program 1 times [2020-07-21 14:14:14,339 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:14,340 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1838892268] [2020-07-21 14:14:14,340 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:14,407 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:14,408 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:14,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 14:14:14,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:14,436 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 14:14:14,436 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:14:14,437 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1838892268] [2020-07-21 14:14:14,438 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:14:14,438 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 14:14:14,439 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202498296] [2020-07-21 14:14:14,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 14:14:14,443 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:14,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 14:14:14,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 14:14:14,456 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2020-07-21 14:14:14,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:14,476 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2020-07-21 14:14:14,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 14:14:14,477 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2020-07-21 14:14:14,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:14,487 INFO L225 Difference]: With dead ends: 47 [2020-07-21 14:14:14,488 INFO L226 Difference]: Without dead ends: 22 [2020-07-21 14:14:14,491 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 14:14:14,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-07-21 14:14:14,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-07-21 14:14:14,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-21 14:14:14,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2020-07-21 14:14:14,524 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 15 [2020-07-21 14:14:14,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:14,524 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2020-07-21 14:14:14,525 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 14:14:14,525 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2020-07-21 14:14:14,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 14:14:14,526 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:14,526 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:14,740 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:14,740 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:14,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:14,742 INFO L82 PathProgramCache]: Analyzing trace with hash 1632722591, now seen corresponding path program 1 times [2020-07-21 14:14:14,742 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:14,743 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [378231116] [2020-07-21 14:14:14,743 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:14,781 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:14,782 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:14,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 14:14:14,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:14,832 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:14:14,867 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 14:14:14,868 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:14:14,868 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [378231116] [2020-07-21 14:14:14,869 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:14:14,869 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 14:14:14,869 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278581048] [2020-07-21 14:14:14,871 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 14:14:14,872 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:14,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 14:14:14,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 14:14:14,873 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 5 states. [2020-07-21 14:14:14,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:14,988 INFO L93 Difference]: Finished difference Result 31 states and 34 transitions. [2020-07-21 14:14:14,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 14:14:14,990 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-07-21 14:14:14,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:14,992 INFO L225 Difference]: With dead ends: 31 [2020-07-21 14:14:14,993 INFO L226 Difference]: Without dead ends: 29 [2020-07-21 14:14:14,995 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 14:14:14,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-21 14:14:15,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2020-07-21 14:14:15,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 14:14:15,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2020-07-21 14:14:15,019 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 17 [2020-07-21 14:14:15,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:15,019 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2020-07-21 14:14:15,020 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 14:14:15,020 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2020-07-21 14:14:15,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 14:14:15,021 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:15,022 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:15,235 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:15,236 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:15,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:15,237 INFO L82 PathProgramCache]: Analyzing trace with hash -1401298672, now seen corresponding path program 1 times [2020-07-21 14:14:15,237 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:15,239 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [768866283] [2020-07-21 14:14:15,239 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:15,307 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:15,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:15,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 14:14:15,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:15,349 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:14:15,350 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:14:15,350 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [768866283] [2020-07-21 14:14:15,351 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:14:15,351 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 14:14:15,351 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524597655] [2020-07-21 14:14:15,352 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 14:14:15,352 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:15,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 14:14:15,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-07-21 14:14:15,353 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 5 states. [2020-07-21 14:14:15,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:15,428 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2020-07-21 14:14:15,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 14:14:15,429 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 25 [2020-07-21 14:14:15,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:15,432 INFO L225 Difference]: With dead ends: 49 [2020-07-21 14:14:15,433 INFO L226 Difference]: Without dead ends: 34 [2020-07-21 14:14:15,434 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-07-21 14:14:15,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-21 14:14:15,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2020-07-21 14:14:15,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 14:14:15,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2020-07-21 14:14:15,446 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 25 [2020-07-21 14:14:15,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:15,446 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2020-07-21 14:14:15,446 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 14:14:15,446 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2020-07-21 14:14:15,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 14:14:15,447 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:15,448 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:15,661 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:15,662 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:15,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:15,663 INFO L82 PathProgramCache]: Analyzing trace with hash 1107622837, now seen corresponding path program 1 times [2020-07-21 14:14:15,663 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:15,664 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [534716181] [2020-07-21 14:14:15,664 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:15,701 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:15,701 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:15,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 14:14:15,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:15,756 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 14:14:15,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:15,807 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 14:14:15,808 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [534716181] [2020-07-21 14:14:15,808 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:15,808 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-07-21 14:14:15,809 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1659166299] [2020-07-21 14:14:15,809 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 14:14:15,809 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:15,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 14:14:15,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-21 14:14:15,810 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand 8 states. [2020-07-21 14:14:15,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:15,958 INFO L93 Difference]: Finished difference Result 55 states and 64 transitions. [2020-07-21 14:14:15,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 14:14:15,960 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-07-21 14:14:15,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:15,961 INFO L225 Difference]: With dead ends: 55 [2020-07-21 14:14:15,962 INFO L226 Difference]: Without dead ends: 40 [2020-07-21 14:14:15,963 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2020-07-21 14:14:15,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-07-21 14:14:15,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 32. [2020-07-21 14:14:15,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-21 14:14:15,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-07-21 14:14:15,979 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 27 [2020-07-21 14:14:15,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:15,979 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-07-21 14:14:15,980 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 14:14:15,980 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-07-21 14:14:15,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 14:14:15,983 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:15,984 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:16,199 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:16,200 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:16,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:16,201 INFO L82 PathProgramCache]: Analyzing trace with hash -1590427366, now seen corresponding path program 2 times [2020-07-21 14:14:16,201 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:16,201 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2061403481] [2020-07-21 14:14:16,201 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:16,237 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:16,237 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:16,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 14:14:16,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:16,270 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:14:16,287 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:14:16,287 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:16,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:14:16,332 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:14:16,332 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2061403481] [2020-07-21 14:14:16,333 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:16,333 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-07-21 14:14:16,333 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994571138] [2020-07-21 14:14:16,334 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 14:14:16,334 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:16,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 14:14:16,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-21 14:14:16,335 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 8 states. [2020-07-21 14:14:16,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:16,402 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2020-07-21 14:14:16,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 14:14:16,402 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-07-21 14:14:16,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:16,404 INFO L225 Difference]: With dead ends: 51 [2020-07-21 14:14:16,404 INFO L226 Difference]: Without dead ends: 49 [2020-07-21 14:14:16,405 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 47 SyntacticMatches, 4 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-21 14:14:16,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-21 14:14:16,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 44. [2020-07-21 14:14:16,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-21 14:14:16,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2020-07-21 14:14:16,413 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 29 [2020-07-21 14:14:16,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:16,414 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2020-07-21 14:14:16,414 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 14:14:16,414 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2020-07-21 14:14:16,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-21 14:14:16,416 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:16,417 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:16,631 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:16,632 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:16,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:16,633 INFO L82 PathProgramCache]: Analyzing trace with hash -30298372, now seen corresponding path program 3 times [2020-07-21 14:14:16,633 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:16,633 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1206614204] [2020-07-21 14:14:16,633 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:16,685 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:16,685 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:16,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 14:14:16,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:16,774 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 28 proven. 6 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-07-21 14:14:16,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:16,848 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 22 proven. 6 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-07-21 14:14:16,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1206614204] [2020-07-21 14:14:16,849 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:16,849 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2020-07-21 14:14:16,849 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176231303] [2020-07-21 14:14:16,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 14:14:16,856 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:16,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 14:14:16,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-07-21 14:14:16,857 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 11 states. [2020-07-21 14:14:16,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:16,979 INFO L93 Difference]: Finished difference Result 83 states and 96 transitions. [2020-07-21 14:14:16,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 14:14:16,980 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 45 [2020-07-21 14:14:16,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:16,982 INFO L225 Difference]: With dead ends: 83 [2020-07-21 14:14:16,983 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 14:14:16,984 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 77 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-07-21 14:14:16,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 14:14:16,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 46. [2020-07-21 14:14:16,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 14:14:17,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-07-21 14:14:17,001 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 45 [2020-07-21 14:14:17,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:17,001 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-07-21 14:14:17,003 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 14:14:17,003 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-07-21 14:14:17,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-07-21 14:14:17,005 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:17,005 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:17,213 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:17,214 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:17,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:17,215 INFO L82 PathProgramCache]: Analyzing trace with hash 130155809, now seen corresponding path program 4 times [2020-07-21 14:14:17,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:17,216 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1080779615] [2020-07-21 14:14:17,217 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:17,262 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:17,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:17,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 14:14:17,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:17,352 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 14:14:17,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:17,440 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 14:14:17,440 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1080779615] [2020-07-21 14:14:17,441 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:17,441 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2020-07-21 14:14:17,441 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859835813] [2020-07-21 14:14:17,442 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 14:14:17,442 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:17,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 14:14:17,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2020-07-21 14:14:17,443 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 14 states. [2020-07-21 14:14:17,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:17,612 INFO L93 Difference]: Finished difference Result 87 states and 103 transitions. [2020-07-21 14:14:17,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 14:14:17,616 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 47 [2020-07-21 14:14:17,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:17,617 INFO L225 Difference]: With dead ends: 87 [2020-07-21 14:14:17,617 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 14:14:17,619 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 77 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2020-07-21 14:14:17,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 14:14:17,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 48. [2020-07-21 14:14:17,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-21 14:14:17,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2020-07-21 14:14:17,631 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 47 [2020-07-21 14:14:17,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:17,631 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2020-07-21 14:14:17,632 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 14:14:17,632 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2020-07-21 14:14:17,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-21 14:14:17,633 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:17,633 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:17,834 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:17,834 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:17,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:17,835 INFO L82 PathProgramCache]: Analyzing trace with hash -292198906, now seen corresponding path program 5 times [2020-07-21 14:14:17,835 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:17,835 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1544584927] [2020-07-21 14:14:17,835 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:17,873 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:17,873 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:17,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 14:14:17,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:17,923 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:14:17,942 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 26 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 14:14:17,942 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:17,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:14:18,016 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 26 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 14:14:18,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1544584927] [2020-07-21 14:14:18,017 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:18,017 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-07-21 14:14:18,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629830190] [2020-07-21 14:14:18,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 14:14:18,018 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:18,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 14:14:18,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-07-21 14:14:18,019 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand 10 states. [2020-07-21 14:14:18,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:18,102 INFO L93 Difference]: Finished difference Result 67 states and 73 transitions. [2020-07-21 14:14:18,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 14:14:18,103 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 49 [2020-07-21 14:14:18,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:18,104 INFO L225 Difference]: With dead ends: 67 [2020-07-21 14:14:18,104 INFO L226 Difference]: Without dead ends: 65 [2020-07-21 14:14:18,105 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 81 SyntacticMatches, 8 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 14:14:18,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-07-21 14:14:18,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 60. [2020-07-21 14:14:18,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 14:14:18,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 65 transitions. [2020-07-21 14:14:18,112 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 65 transitions. Word has length 49 [2020-07-21 14:14:18,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:18,113 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 65 transitions. [2020-07-21 14:14:18,113 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 14:14:18,113 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 65 transitions. [2020-07-21 14:14:18,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 14:14:18,114 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:18,114 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:18,315 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:18,315 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:18,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:18,316 INFO L82 PathProgramCache]: Analyzing trace with hash 551795688, now seen corresponding path program 6 times [2020-07-21 14:14:18,316 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:18,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1249235573] [2020-07-21 14:14:18,317 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:18,360 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:18,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:18,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 14:14:18,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:18,509 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 72 proven. 20 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-21 14:14:18,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:18,636 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 58 proven. 20 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2020-07-21 14:14:18,636 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1249235573] [2020-07-21 14:14:18,636 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:18,636 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 17 [2020-07-21 14:14:18,637 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85550516] [2020-07-21 14:14:18,637 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 14:14:18,637 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:18,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 14:14:18,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2020-07-21 14:14:18,638 INFO L87 Difference]: Start difference. First operand 60 states and 65 transitions. Second operand 17 states. [2020-07-21 14:14:18,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:18,871 INFO L93 Difference]: Finished difference Result 115 states and 135 transitions. [2020-07-21 14:14:18,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 14:14:18,872 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 65 [2020-07-21 14:14:18,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:18,873 INFO L225 Difference]: With dead ends: 115 [2020-07-21 14:14:18,873 INFO L226 Difference]: Without dead ends: 82 [2020-07-21 14:14:18,874 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 109 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2020-07-21 14:14:18,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-21 14:14:18,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 62. [2020-07-21 14:14:18,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-07-21 14:14:18,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2020-07-21 14:14:18,893 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 65 [2020-07-21 14:14:18,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:18,894 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2020-07-21 14:14:18,894 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 14:14:18,894 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2020-07-21 14:14:18,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 14:14:18,898 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:18,898 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:19,116 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:19,117 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:19,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:19,118 INFO L82 PathProgramCache]: Analyzing trace with hash -150434419, now seen corresponding path program 7 times [2020-07-21 14:14:19,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:19,119 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [463596956] [2020-07-21 14:14:19,120 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:19,163 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:19,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:19,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 14:14:19,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:19,302 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 60 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 14:14:19,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:19,433 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 60 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 14:14:19,433 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [463596956] [2020-07-21 14:14:19,433 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:19,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 20 [2020-07-21 14:14:19,434 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053995685] [2020-07-21 14:14:19,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 14:14:19,434 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:19,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 14:14:19,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2020-07-21 14:14:19,435 INFO L87 Difference]: Start difference. First operand 62 states and 67 transitions. Second operand 20 states. [2020-07-21 14:14:19,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:19,689 INFO L93 Difference]: Finished difference Result 119 states and 142 transitions. [2020-07-21 14:14:19,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 14:14:19,689 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 67 [2020-07-21 14:14:19,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:19,691 INFO L225 Difference]: With dead ends: 119 [2020-07-21 14:14:19,691 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 14:14:19,692 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 109 SyntacticMatches, 6 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2020-07-21 14:14:19,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 14:14:19,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 64. [2020-07-21 14:14:19,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-21 14:14:19,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 69 transitions. [2020-07-21 14:14:19,699 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 69 transitions. Word has length 67 [2020-07-21 14:14:19,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:19,700 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 69 transitions. [2020-07-21 14:14:19,700 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 14:14:19,700 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 69 transitions. [2020-07-21 14:14:19,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-21 14:14:19,701 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:19,701 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:19,907 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:19,907 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:19,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:19,908 INFO L82 PathProgramCache]: Analyzing trace with hash -683701774, now seen corresponding path program 8 times [2020-07-21 14:14:19,909 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:19,909 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1741097238] [2020-07-21 14:14:19,910 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:19,953 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:19,953 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:19,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 14:14:19,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:20,007 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:14:20,030 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 52 proven. 50 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 14:14:20,030 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:20,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:14:20,134 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 52 proven. 50 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 14:14:20,134 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1741097238] [2020-07-21 14:14:20,135 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:20,135 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-07-21 14:14:20,135 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737268188] [2020-07-21 14:14:20,136 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 14:14:20,136 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:20,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 14:14:20,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2020-07-21 14:14:20,137 INFO L87 Difference]: Start difference. First operand 64 states and 69 transitions. Second operand 12 states. [2020-07-21 14:14:20,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:20,238 INFO L93 Difference]: Finished difference Result 83 states and 90 transitions. [2020-07-21 14:14:20,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 14:14:20,239 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 69 [2020-07-21 14:14:20,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:20,240 INFO L225 Difference]: With dead ends: 83 [2020-07-21 14:14:20,240 INFO L226 Difference]: Without dead ends: 81 [2020-07-21 14:14:20,241 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 115 SyntacticMatches, 12 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=53, Invalid=103, Unknown=0, NotChecked=0, Total=156 [2020-07-21 14:14:20,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-21 14:14:20,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 76. [2020-07-21 14:14:20,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 14:14:20,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2020-07-21 14:14:20,249 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 69 [2020-07-21 14:14:20,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:20,249 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2020-07-21 14:14:20,249 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 14:14:20,250 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2020-07-21 14:14:20,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-07-21 14:14:20,251 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:20,251 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:20,462 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:20,463 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:20,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:20,464 INFO L82 PathProgramCache]: Analyzing trace with hash 192972756, now seen corresponding path program 9 times [2020-07-21 14:14:20,464 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:20,465 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1551380142] [2020-07-21 14:14:20,465 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:20,509 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:20,509 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:20,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 14:14:20,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:20,679 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 132 proven. 42 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-07-21 14:14:20,679 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:20,854 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 110 proven. 42 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2020-07-21 14:14:20,855 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1551380142] [2020-07-21 14:14:20,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:20,855 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 23 [2020-07-21 14:14:20,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1596055188] [2020-07-21 14:14:20,857 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 14:14:20,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:20,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 14:14:20,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 14:14:20,858 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand 23 states. [2020-07-21 14:14:21,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:21,130 INFO L93 Difference]: Finished difference Result 147 states and 174 transitions. [2020-07-21 14:14:21,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 14:14:21,130 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 85 [2020-07-21 14:14:21,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:21,132 INFO L225 Difference]: With dead ends: 147 [2020-07-21 14:14:21,132 INFO L226 Difference]: Without dead ends: 106 [2020-07-21 14:14:21,135 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 141 SyntacticMatches, 7 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2020-07-21 14:14:21,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-07-21 14:14:21,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 78. [2020-07-21 14:14:21,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-07-21 14:14:21,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 84 transitions. [2020-07-21 14:14:21,147 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 84 transitions. Word has length 85 [2020-07-21 14:14:21,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:21,147 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 84 transitions. [2020-07-21 14:14:21,147 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 14:14:21,147 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 84 transitions. [2020-07-21 14:14:21,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-07-21 14:14:21,148 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:21,148 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:21,357 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:21,357 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:21,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:21,358 INFO L82 PathProgramCache]: Analyzing trace with hash 1722356985, now seen corresponding path program 10 times [2020-07-21 14:14:21,359 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:21,359 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [979799412] [2020-07-21 14:14:21,360 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:21,410 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:21,411 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:21,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 14:14:21,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:21,635 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 112 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 14:14:21,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:21,839 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 112 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 14:14:21,840 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [979799412] [2020-07-21 14:14:21,840 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:21,840 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 26 [2020-07-21 14:14:21,840 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338213188] [2020-07-21 14:14:21,841 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 14:14:21,841 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:21,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 14:14:21,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=481, Unknown=0, NotChecked=0, Total=650 [2020-07-21 14:14:21,842 INFO L87 Difference]: Start difference. First operand 78 states and 84 transitions. Second operand 26 states. [2020-07-21 14:14:22,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:22,136 INFO L93 Difference]: Finished difference Result 151 states and 181 transitions. [2020-07-21 14:14:22,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 14:14:22,136 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 87 [2020-07-21 14:14:22,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:22,137 INFO L225 Difference]: With dead ends: 151 [2020-07-21 14:14:22,138 INFO L226 Difference]: Without dead ends: 112 [2020-07-21 14:14:22,139 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 141 SyntacticMatches, 8 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 14:14:22,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-21 14:14:22,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 80. [2020-07-21 14:14:22,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-21 14:14:22,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 86 transitions. [2020-07-21 14:14:22,145 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 86 transitions. Word has length 87 [2020-07-21 14:14:22,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:22,146 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 86 transitions. [2020-07-21 14:14:22,146 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 14:14:22,146 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 86 transitions. [2020-07-21 14:14:22,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-07-21 14:14:22,147 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:22,147 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:22,351 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:22,352 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:22,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:22,354 INFO L82 PathProgramCache]: Analyzing trace with hash -1713181474, now seen corresponding path program 11 times [2020-07-21 14:14:22,354 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:22,355 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1353246825] [2020-07-21 14:14:22,355 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:22,400 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:22,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:22,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 14:14:22,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:22,491 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:14:22,516 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 86 proven. 98 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 14:14:22,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:22,535 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:14:22,650 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 86 proven. 98 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 14:14:22,650 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1353246825] [2020-07-21 14:14:22,651 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:22,651 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-07-21 14:14:22,651 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444521124] [2020-07-21 14:14:22,652 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 14:14:22,652 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:22,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 14:14:22,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2020-07-21 14:14:22,653 INFO L87 Difference]: Start difference. First operand 80 states and 86 transitions. Second operand 14 states. [2020-07-21 14:14:22,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:22,800 INFO L93 Difference]: Finished difference Result 99 states and 107 transitions. [2020-07-21 14:14:22,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 14:14:22,801 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 89 [2020-07-21 14:14:22,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:22,802 INFO L225 Difference]: With dead ends: 99 [2020-07-21 14:14:22,802 INFO L226 Difference]: Without dead ends: 97 [2020-07-21 14:14:22,803 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 149 SyntacticMatches, 16 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=74, Invalid=136, Unknown=0, NotChecked=0, Total=210 [2020-07-21 14:14:22,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-21 14:14:22,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 92. [2020-07-21 14:14:22,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-07-21 14:14:22,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 99 transitions. [2020-07-21 14:14:22,816 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 99 transitions. Word has length 89 [2020-07-21 14:14:22,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:22,818 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 99 transitions. [2020-07-21 14:14:22,818 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 14:14:22,818 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 99 transitions. [2020-07-21 14:14:22,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-07-21 14:14:22,819 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:22,819 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:23,032 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:23,033 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:23,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:23,033 INFO L82 PathProgramCache]: Analyzing trace with hash -1950838080, now seen corresponding path program 12 times [2020-07-21 14:14:23,033 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:23,033 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1212191481] [2020-07-21 14:14:23,034 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:23,086 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:23,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:23,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 14:14:23,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:23,281 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 208 proven. 72 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2020-07-21 14:14:23,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:23,532 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 178 proven. 72 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2020-07-21 14:14:23,532 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1212191481] [2020-07-21 14:14:23,532 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:23,532 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 29 [2020-07-21 14:14:23,533 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674401166] [2020-07-21 14:14:23,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 14:14:23,533 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:23,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 14:14:23,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=604, Unknown=0, NotChecked=0, Total=812 [2020-07-21 14:14:23,534 INFO L87 Difference]: Start difference. First operand 92 states and 99 transitions. Second operand 29 states. [2020-07-21 14:14:23,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:23,930 INFO L93 Difference]: Finished difference Result 179 states and 213 transitions. [2020-07-21 14:14:23,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 14:14:23,931 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 105 [2020-07-21 14:14:23,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:23,932 INFO L225 Difference]: With dead ends: 179 [2020-07-21 14:14:23,932 INFO L226 Difference]: Without dead ends: 130 [2020-07-21 14:14:23,934 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 173 SyntacticMatches, 9 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 316 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 14:14:23,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-07-21 14:14:23,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 94. [2020-07-21 14:14:23,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-07-21 14:14:23,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 101 transitions. [2020-07-21 14:14:23,948 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 101 transitions. Word has length 105 [2020-07-21 14:14:23,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:23,948 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 101 transitions. [2020-07-21 14:14:23,948 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 14:14:23,949 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 101 transitions. [2020-07-21 14:14:23,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-07-21 14:14:23,953 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:23,953 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:24,166 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:24,167 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:24,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:24,167 INFO L82 PathProgramCache]: Analyzing trace with hash -734782619, now seen corresponding path program 13 times [2020-07-21 14:14:24,167 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:24,168 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [703785216] [2020-07-21 14:14:24,168 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:24,222 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:24,222 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:24,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 14:14:24,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:24,468 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 180 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 14:14:24,468 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:24,742 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 180 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 14:14:24,742 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [703785216] [2020-07-21 14:14:24,742 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:24,742 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 32 [2020-07-21 14:14:24,743 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [279449214] [2020-07-21 14:14:24,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-21 14:14:24,743 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:24,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-21 14:14:24,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=741, Unknown=0, NotChecked=0, Total=992 [2020-07-21 14:14:24,745 INFO L87 Difference]: Start difference. First operand 94 states and 101 transitions. Second operand 32 states. [2020-07-21 14:14:25,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:25,191 INFO L93 Difference]: Finished difference Result 183 states and 220 transitions. [2020-07-21 14:14:25,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 14:14:25,192 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 107 [2020-07-21 14:14:25,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:25,194 INFO L225 Difference]: With dead ends: 183 [2020-07-21 14:14:25,194 INFO L226 Difference]: Without dead ends: 136 [2020-07-21 14:14:25,195 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 173 SyntacticMatches, 10 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 396 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2020-07-21 14:14:25,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2020-07-21 14:14:25,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 96. [2020-07-21 14:14:25,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-07-21 14:14:25,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 103 transitions. [2020-07-21 14:14:25,202 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 103 transitions. Word has length 107 [2020-07-21 14:14:25,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:25,202 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 103 transitions. [2020-07-21 14:14:25,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-21 14:14:25,202 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 103 transitions. [2020-07-21 14:14:25,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 14:14:25,203 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:25,204 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:25,416 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:25,417 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:25,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:25,418 INFO L82 PathProgramCache]: Analyzing trace with hash -336589110, now seen corresponding path program 14 times [2020-07-21 14:14:25,418 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:25,419 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [225665917] [2020-07-21 14:14:25,419 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:25,475 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:25,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:25,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 14:14:25,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:25,565 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:14:25,592 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 128 proven. 162 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 14:14:25,592 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:25,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:14:25,783 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 128 proven. 162 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 14:14:25,783 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [225665917] [2020-07-21 14:14:25,784 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:25,784 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-07-21 14:14:25,784 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953845894] [2020-07-21 14:14:25,785 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 14:14:25,785 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:25,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 14:14:25,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=145, Unknown=0, NotChecked=0, Total=240 [2020-07-21 14:14:25,785 INFO L87 Difference]: Start difference. First operand 96 states and 103 transitions. Second operand 16 states. [2020-07-21 14:14:25,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:25,918 INFO L93 Difference]: Finished difference Result 115 states and 124 transitions. [2020-07-21 14:14:25,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 14:14:25,918 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 109 [2020-07-21 14:14:25,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:25,920 INFO L225 Difference]: With dead ends: 115 [2020-07-21 14:14:25,920 INFO L226 Difference]: Without dead ends: 113 [2020-07-21 14:14:25,921 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 183 SyntacticMatches, 20 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=99, Invalid=173, Unknown=0, NotChecked=0, Total=272 [2020-07-21 14:14:25,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-21 14:14:25,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 108. [2020-07-21 14:14:25,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-21 14:14:25,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 116 transitions. [2020-07-21 14:14:25,928 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 116 transitions. Word has length 109 [2020-07-21 14:14:25,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:25,929 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 116 transitions. [2020-07-21 14:14:25,929 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 14:14:25,929 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 116 transitions. [2020-07-21 14:14:25,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2020-07-21 14:14:25,930 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:25,930 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:26,131 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:26,131 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:26,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:26,132 INFO L82 PathProgramCache]: Analyzing trace with hash 1711037612, now seen corresponding path program 15 times [2020-07-21 14:14:26,132 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:26,133 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2008683021] [2020-07-21 14:14:26,133 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:26,189 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:26,189 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:26,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 14:14:26,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:26,470 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 300 proven. 110 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2020-07-21 14:14:26,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:26,797 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 262 proven. 110 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-07-21 14:14:26,797 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2008683021] [2020-07-21 14:14:26,797 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:26,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 35 [2020-07-21 14:14:26,798 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453671087] [2020-07-21 14:14:26,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 14:14:26,798 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:26,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 14:14:26,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=892, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 14:14:26,800 INFO L87 Difference]: Start difference. First operand 108 states and 116 transitions. Second operand 35 states. [2020-07-21 14:14:27,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:27,286 INFO L93 Difference]: Finished difference Result 211 states and 252 transitions. [2020-07-21 14:14:27,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 14:14:27,286 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 125 [2020-07-21 14:14:27,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:27,288 INFO L225 Difference]: With dead ends: 211 [2020-07-21 14:14:27,288 INFO L226 Difference]: Without dead ends: 154 [2020-07-21 14:14:27,290 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 205 SyntacticMatches, 11 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 485 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 14:14:27,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2020-07-21 14:14:27,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 110. [2020-07-21 14:14:27,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-21 14:14:27,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 118 transitions. [2020-07-21 14:14:27,310 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 118 transitions. Word has length 125 [2020-07-21 14:14:27,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:27,311 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 118 transitions. [2020-07-21 14:14:27,311 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 14:14:27,311 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 118 transitions. [2020-07-21 14:14:27,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-07-21 14:14:27,314 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:27,314 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:27,529 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:27,530 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:27,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:27,531 INFO L82 PathProgramCache]: Analyzing trace with hash 66724049, now seen corresponding path program 16 times [2020-07-21 14:14:27,531 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:27,532 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [782564062] [2020-07-21 14:14:27,532 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:27,586 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:27,586 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:27,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 340 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 14:14:27,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:27,919 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 264 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 14:14:27,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:28,313 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 264 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 14:14:28,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [782564062] [2020-07-21 14:14:28,314 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:28,314 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 38 [2020-07-21 14:14:28,314 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463379438] [2020-07-21 14:14:28,316 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-21 14:14:28,317 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:28,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-21 14:14:28,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=1057, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 14:14:28,318 INFO L87 Difference]: Start difference. First operand 110 states and 118 transitions. Second operand 38 states. [2020-07-21 14:14:28,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:28,816 INFO L93 Difference]: Finished difference Result 215 states and 259 transitions. [2020-07-21 14:14:28,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 14:14:28,816 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 127 [2020-07-21 14:14:28,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:28,818 INFO L225 Difference]: With dead ends: 215 [2020-07-21 14:14:28,818 INFO L226 Difference]: Without dead ends: 160 [2020-07-21 14:14:28,821 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 205 SyntacticMatches, 12 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 583 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=673, Invalid=1777, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 14:14:28,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2020-07-21 14:14:28,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 112. [2020-07-21 14:14:28,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-07-21 14:14:28,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 120 transitions. [2020-07-21 14:14:28,828 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 120 transitions. Word has length 127 [2020-07-21 14:14:28,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:28,828 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 120 transitions. [2020-07-21 14:14:28,828 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-21 14:14:28,828 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 120 transitions. [2020-07-21 14:14:28,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-07-21 14:14:28,830 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:28,830 INFO L422 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:29,043 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:29,044 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:29,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:29,045 INFO L82 PathProgramCache]: Analyzing trace with hash 429354934, now seen corresponding path program 17 times [2020-07-21 14:14:29,045 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:29,045 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [110514060] [2020-07-21 14:14:29,046 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:29,102 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:29,102 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:29,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 14:14:29,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:29,215 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:14:29,247 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 178 proven. 242 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 14:14:29,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:29,264 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:14:29,535 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 178 proven. 242 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 14:14:29,535 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [110514060] [2020-07-21 14:14:29,536 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:29,536 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-07-21 14:14:29,536 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383906280] [2020-07-21 14:14:29,537 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 14:14:29,537 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:29,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 14:14:29,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=182, Unknown=0, NotChecked=0, Total=306 [2020-07-21 14:14:29,537 INFO L87 Difference]: Start difference. First operand 112 states and 120 transitions. Second operand 18 states. [2020-07-21 14:14:29,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:29,681 INFO L93 Difference]: Finished difference Result 131 states and 141 transitions. [2020-07-21 14:14:29,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 14:14:29,684 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 129 [2020-07-21 14:14:29,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:29,685 INFO L225 Difference]: With dead ends: 131 [2020-07-21 14:14:29,685 INFO L226 Difference]: Without dead ends: 129 [2020-07-21 14:14:29,686 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 217 SyntacticMatches, 24 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=128, Invalid=214, Unknown=0, NotChecked=0, Total=342 [2020-07-21 14:14:29,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2020-07-21 14:14:29,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 124. [2020-07-21 14:14:29,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-07-21 14:14:29,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 133 transitions. [2020-07-21 14:14:29,697 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 133 transitions. Word has length 129 [2020-07-21 14:14:29,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:29,698 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 133 transitions. [2020-07-21 14:14:29,698 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 14:14:29,698 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 133 transitions. [2020-07-21 14:14:29,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-21 14:14:29,699 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:29,700 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:29,912 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:29,913 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:29,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:29,913 INFO L82 PathProgramCache]: Analyzing trace with hash 1971086744, now seen corresponding path program 18 times [2020-07-21 14:14:29,914 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:29,914 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [250329216] [2020-07-21 14:14:29,914 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:30,014 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:30,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:30,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 14:14:30,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:30,434 INFO L134 CoverageAnalysis]: Checked inductivity of 832 backedges. 408 proven. 156 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2020-07-21 14:14:30,434 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:30,911 INFO L134 CoverageAnalysis]: Checked inductivity of 832 backedges. 362 proven. 156 refuted. 0 times theorem prover too weak. 314 trivial. 0 not checked. [2020-07-21 14:14:30,911 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [250329216] [2020-07-21 14:14:30,912 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:30,912 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 41 [2020-07-21 14:14:30,912 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [365372675] [2020-07-21 14:14:30,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-07-21 14:14:30,916 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:30,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-07-21 14:14:30,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=1236, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 14:14:30,918 INFO L87 Difference]: Start difference. First operand 124 states and 133 transitions. Second operand 41 states. [2020-07-21 14:14:31,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:31,512 INFO L93 Difference]: Finished difference Result 243 states and 291 transitions. [2020-07-21 14:14:31,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-21 14:14:31,512 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 145 [2020-07-21 14:14:31,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:31,513 INFO L225 Difference]: With dead ends: 243 [2020-07-21 14:14:31,514 INFO L226 Difference]: Without dead ends: 178 [2020-07-21 14:14:31,515 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 237 SyntacticMatches, 13 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 690 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=781, Invalid=2081, Unknown=0, NotChecked=0, Total=2862 [2020-07-21 14:14:31,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-07-21 14:14:31,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 126. [2020-07-21 14:14:31,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2020-07-21 14:14:31,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 135 transitions. [2020-07-21 14:14:31,523 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 135 transitions. Word has length 145 [2020-07-21 14:14:31,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:31,523 INFO L479 AbstractCegarLoop]: Abstraction has 126 states and 135 transitions. [2020-07-21 14:14:31,523 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-07-21 14:14:31,523 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 135 transitions. [2020-07-21 14:14:31,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2020-07-21 14:14:31,525 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:31,525 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:31,738 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:31,739 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:31,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:31,740 INFO L82 PathProgramCache]: Analyzing trace with hash 554411325, now seen corresponding path program 19 times [2020-07-21 14:14:31,740 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:31,740 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1807304912] [2020-07-21 14:14:31,741 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:31,806 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:31,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:31,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-21 14:14:31,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:32,216 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 364 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 14:14:32,217 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:32,726 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 364 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 14:14:32,727 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1807304912] [2020-07-21 14:14:32,727 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:32,727 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 44 [2020-07-21 14:14:32,727 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [242588175] [2020-07-21 14:14:32,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-21 14:14:32,728 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:32,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-21 14:14:32,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1429, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 14:14:32,729 INFO L87 Difference]: Start difference. First operand 126 states and 135 transitions. Second operand 44 states. [2020-07-21 14:14:33,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:33,339 INFO L93 Difference]: Finished difference Result 247 states and 298 transitions. [2020-07-21 14:14:33,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-21 14:14:33,339 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 147 [2020-07-21 14:14:33,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:33,341 INFO L225 Difference]: With dead ends: 247 [2020-07-21 14:14:33,341 INFO L226 Difference]: Without dead ends: 184 [2020-07-21 14:14:33,343 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 237 SyntacticMatches, 14 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 806 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=897, Invalid=2409, Unknown=0, NotChecked=0, Total=3306 [2020-07-21 14:14:33,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2020-07-21 14:14:33,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 128. [2020-07-21 14:14:33,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2020-07-21 14:14:33,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 137 transitions. [2020-07-21 14:14:33,351 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 137 transitions. Word has length 147 [2020-07-21 14:14:33,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:33,351 INFO L479 AbstractCegarLoop]: Abstraction has 128 states and 137 transitions. [2020-07-21 14:14:33,352 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-21 14:14:33,352 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 137 transitions. [2020-07-21 14:14:33,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2020-07-21 14:14:33,353 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:33,353 INFO L422 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:33,566 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:33,567 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:33,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:33,568 INFO L82 PathProgramCache]: Analyzing trace with hash 633966498, now seen corresponding path program 20 times [2020-07-21 14:14:33,568 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:33,568 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [190781778] [2020-07-21 14:14:33,569 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:33,636 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:33,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:33,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 31 conjunts are in the unsatisfiable core [2020-07-21 14:14:33,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:33,783 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:14:33,817 INFO L134 CoverageAnalysis]: Checked inductivity of 886 backedges. 236 proven. 338 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 14:14:33,818 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:33,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:14:34,118 INFO L134 CoverageAnalysis]: Checked inductivity of 886 backedges. 236 proven. 338 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 14:14:34,118 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [190781778] [2020-07-21 14:14:34,118 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:34,119 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-07-21 14:14:34,119 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779985550] [2020-07-21 14:14:34,119 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 14:14:34,119 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:34,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 14:14:34,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=223, Unknown=0, NotChecked=0, Total=380 [2020-07-21 14:14:34,120 INFO L87 Difference]: Start difference. First operand 128 states and 137 transitions. Second operand 20 states. [2020-07-21 14:14:34,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:34,309 INFO L93 Difference]: Finished difference Result 147 states and 158 transitions. [2020-07-21 14:14:34,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 14:14:34,316 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 149 [2020-07-21 14:14:34,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:34,317 INFO L225 Difference]: With dead ends: 147 [2020-07-21 14:14:34,317 INFO L226 Difference]: Without dead ends: 145 [2020-07-21 14:14:34,318 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 251 SyntacticMatches, 28 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 293 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=161, Invalid=259, Unknown=0, NotChecked=0, Total=420 [2020-07-21 14:14:34,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2020-07-21 14:14:34,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 140. [2020-07-21 14:14:34,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-07-21 14:14:34,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 150 transitions. [2020-07-21 14:14:34,330 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 150 transitions. Word has length 149 [2020-07-21 14:14:34,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:34,330 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 150 transitions. [2020-07-21 14:14:34,330 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 14:14:34,330 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 150 transitions. [2020-07-21 14:14:34,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2020-07-21 14:14:34,332 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:34,332 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 15, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:34,545 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:34,546 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:34,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:34,547 INFO L82 PathProgramCache]: Analyzing trace with hash -869716604, now seen corresponding path program 21 times [2020-07-21 14:14:34,547 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:34,548 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [646413682] [2020-07-21 14:14:34,548 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:34,629 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:34,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:34,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-21 14:14:34,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:35,116 INFO L134 CoverageAnalysis]: Checked inductivity of 1110 backedges. 532 proven. 210 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-21 14:14:35,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:35,673 INFO L134 CoverageAnalysis]: Checked inductivity of 1110 backedges. 478 proven. 210 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-21 14:14:35,673 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [646413682] [2020-07-21 14:14:35,673 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:35,673 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32] total 47 [2020-07-21 14:14:35,674 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305382141] [2020-07-21 14:14:35,674 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-07-21 14:14:35,674 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:35,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-07-21 14:14:35,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1636, Unknown=0, NotChecked=0, Total=2162 [2020-07-21 14:14:35,675 INFO L87 Difference]: Start difference. First operand 140 states and 150 transitions. Second operand 47 states. [2020-07-21 14:14:36,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:36,401 INFO L93 Difference]: Finished difference Result 275 states and 330 transitions. [2020-07-21 14:14:36,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 14:14:36,401 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 165 [2020-07-21 14:14:36,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:36,403 INFO L225 Difference]: With dead ends: 275 [2020-07-21 14:14:36,403 INFO L226 Difference]: Without dead ends: 202 [2020-07-21 14:14:36,405 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 269 SyntacticMatches, 15 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 931 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1021, Invalid=2761, Unknown=0, NotChecked=0, Total=3782 [2020-07-21 14:14:36,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-21 14:14:36,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 142. [2020-07-21 14:14:36,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2020-07-21 14:14:36,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 152 transitions. [2020-07-21 14:14:36,413 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 152 transitions. Word has length 165 [2020-07-21 14:14:36,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:36,414 INFO L479 AbstractCegarLoop]: Abstraction has 142 states and 152 transitions. [2020-07-21 14:14:36,414 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-07-21 14:14:36,414 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 152 transitions. [2020-07-21 14:14:36,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2020-07-21 14:14:36,415 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:36,416 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:36,629 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:36,630 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:36,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:36,631 INFO L82 PathProgramCache]: Analyzing trace with hash -583456599, now seen corresponding path program 22 times [2020-07-21 14:14:36,631 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:36,631 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [305445051] [2020-07-21 14:14:36,632 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:36,699 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:36,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:36,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 34 conjunts are in the unsatisfiable core [2020-07-21 14:14:36,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:37,249 INFO L134 CoverageAnalysis]: Checked inductivity of 1140 backedges. 480 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 14:14:37,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:37,882 INFO L134 CoverageAnalysis]: Checked inductivity of 1140 backedges. 480 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 14:14:37,883 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [305445051] [2020-07-21 14:14:37,883 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:37,883 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34] total 50 [2020-07-21 14:14:37,884 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488012030] [2020-07-21 14:14:37,884 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-21 14:14:37,885 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:37,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-21 14:14:37,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=593, Invalid=1857, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 14:14:37,889 INFO L87 Difference]: Start difference. First operand 142 states and 152 transitions. Second operand 50 states. [2020-07-21 14:14:38,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:38,711 INFO L93 Difference]: Finished difference Result 279 states and 337 transitions. [2020-07-21 14:14:38,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 14:14:38,711 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 167 [2020-07-21 14:14:38,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:38,713 INFO L225 Difference]: With dead ends: 279 [2020-07-21 14:14:38,713 INFO L226 Difference]: Without dead ends: 208 [2020-07-21 14:14:38,715 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 269 SyntacticMatches, 16 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1065 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1153, Invalid=3137, Unknown=0, NotChecked=0, Total=4290 [2020-07-21 14:14:38,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2020-07-21 14:14:38,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 144. [2020-07-21 14:14:38,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-21 14:14:38,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 154 transitions. [2020-07-21 14:14:38,724 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 154 transitions. Word has length 167 [2020-07-21 14:14:38,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:38,724 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 154 transitions. [2020-07-21 14:14:38,724 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-21 14:14:38,724 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 154 transitions. [2020-07-21 14:14:38,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2020-07-21 14:14:38,726 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:38,726 INFO L422 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:38,938 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:38,939 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:38,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:38,940 INFO L82 PathProgramCache]: Analyzing trace with hash -365498738, now seen corresponding path program 23 times [2020-07-21 14:14:38,940 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:38,940 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [421109788] [2020-07-21 14:14:38,940 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:39,011 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:39,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:39,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-21 14:14:39,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:39,179 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:14:39,222 INFO L134 CoverageAnalysis]: Checked inductivity of 1172 backedges. 302 proven. 450 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 14:14:39,222 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:39,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:14:39,586 INFO L134 CoverageAnalysis]: Checked inductivity of 1172 backedges. 302 proven. 450 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 14:14:39,586 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [421109788] [2020-07-21 14:14:39,586 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:39,586 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2020-07-21 14:14:39,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2134811875] [2020-07-21 14:14:39,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 14:14:39,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:39,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 14:14:39,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=268, Unknown=0, NotChecked=0, Total=462 [2020-07-21 14:14:39,588 INFO L87 Difference]: Start difference. First operand 144 states and 154 transitions. Second operand 22 states. [2020-07-21 14:14:39,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:39,791 INFO L93 Difference]: Finished difference Result 163 states and 175 transitions. [2020-07-21 14:14:39,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 14:14:39,792 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 169 [2020-07-21 14:14:39,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:39,794 INFO L225 Difference]: With dead ends: 163 [2020-07-21 14:14:39,794 INFO L226 Difference]: Without dead ends: 161 [2020-07-21 14:14:39,795 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 285 SyntacticMatches, 32 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 367 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=198, Invalid=308, Unknown=0, NotChecked=0, Total=506 [2020-07-21 14:14:39,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2020-07-21 14:14:39,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 156. [2020-07-21 14:14:39,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2020-07-21 14:14:39,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 167 transitions. [2020-07-21 14:14:39,803 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 167 transitions. Word has length 169 [2020-07-21 14:14:39,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:39,804 INFO L479 AbstractCegarLoop]: Abstraction has 156 states and 167 transitions. [2020-07-21 14:14:39,804 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 14:14:39,804 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 167 transitions. [2020-07-21 14:14:39,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2020-07-21 14:14:39,805 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:39,806 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 17, 17, 17, 17, 17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:40,020 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:40,021 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:40,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:40,022 INFO L82 PathProgramCache]: Analyzing trace with hash -760007568, now seen corresponding path program 24 times [2020-07-21 14:14:40,022 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:40,022 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [224204131] [2020-07-21 14:14:40,023 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:40,097 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:40,098 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:40,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 492 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-21 14:14:40,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:40,691 INFO L134 CoverageAnalysis]: Checked inductivity of 1428 backedges. 672 proven. 272 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2020-07-21 14:14:40,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:41,404 INFO L134 CoverageAnalysis]: Checked inductivity of 1428 backedges. 610 proven. 272 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2020-07-21 14:14:41,404 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [224204131] [2020-07-21 14:14:41,404 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:41,404 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36] total 53 [2020-07-21 14:14:41,404 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33249841] [2020-07-21 14:14:41,405 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-07-21 14:14:41,405 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:41,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-07-21 14:14:41,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=664, Invalid=2092, Unknown=0, NotChecked=0, Total=2756 [2020-07-21 14:14:41,406 INFO L87 Difference]: Start difference. First operand 156 states and 167 transitions. Second operand 53 states. [2020-07-21 14:14:42,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:42,424 INFO L93 Difference]: Finished difference Result 307 states and 369 transitions. [2020-07-21 14:14:42,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 14:14:42,426 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 185 [2020-07-21 14:14:42,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:42,428 INFO L225 Difference]: With dead ends: 307 [2020-07-21 14:14:42,428 INFO L226 Difference]: Without dead ends: 226 [2020-07-21 14:14:42,430 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 301 SyntacticMatches, 17 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1208 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1293, Invalid=3537, Unknown=0, NotChecked=0, Total=4830 [2020-07-21 14:14:42,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2020-07-21 14:14:42,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 158. [2020-07-21 14:14:42,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2020-07-21 14:14:42,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 169 transitions. [2020-07-21 14:14:42,446 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 169 transitions. Word has length 185 [2020-07-21 14:14:42,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:42,446 INFO L479 AbstractCegarLoop]: Abstraction has 158 states and 169 transitions. [2020-07-21 14:14:42,446 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-07-21 14:14:42,446 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 169 transitions. [2020-07-21 14:14:42,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2020-07-21 14:14:42,448 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:42,448 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:42,662 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:42,663 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:42,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:42,664 INFO L82 PathProgramCache]: Analyzing trace with hash -1861014763, now seen corresponding path program 25 times [2020-07-21 14:14:42,664 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:42,664 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [603199377] [2020-07-21 14:14:42,665 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:42,779 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:42,780 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:42,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 502 conjuncts, 38 conjunts are in the unsatisfiable core [2020-07-21 14:14:42,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:43,480 INFO L134 CoverageAnalysis]: Checked inductivity of 1462 backedges. 612 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 14:14:43,480 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:44,252 INFO L134 CoverageAnalysis]: Checked inductivity of 1462 backedges. 612 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 14:14:44,252 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [603199377] [2020-07-21 14:14:44,252 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:44,252 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38] total 56 [2020-07-21 14:14:44,252 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081167679] [2020-07-21 14:14:44,253 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-07-21 14:14:44,253 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:44,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-07-21 14:14:44,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=739, Invalid=2341, Unknown=0, NotChecked=0, Total=3080 [2020-07-21 14:14:44,254 INFO L87 Difference]: Start difference. First operand 158 states and 169 transitions. Second operand 56 states. [2020-07-21 14:14:45,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:45,233 INFO L93 Difference]: Finished difference Result 311 states and 376 transitions. [2020-07-21 14:14:45,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 14:14:45,233 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 187 [2020-07-21 14:14:45,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:45,234 INFO L225 Difference]: With dead ends: 311 [2020-07-21 14:14:45,234 INFO L226 Difference]: Without dead ends: 232 [2020-07-21 14:14:45,236 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 301 SyntacticMatches, 18 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1360 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1441, Invalid=3961, Unknown=0, NotChecked=0, Total=5402 [2020-07-21 14:14:45,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2020-07-21 14:14:45,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 160. [2020-07-21 14:14:45,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2020-07-21 14:14:45,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 171 transitions. [2020-07-21 14:14:45,245 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 171 transitions. Word has length 187 [2020-07-21 14:14:45,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:45,245 INFO L479 AbstractCegarLoop]: Abstraction has 160 states and 171 transitions. [2020-07-21 14:14:45,245 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-07-21 14:14:45,245 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 171 transitions. [2020-07-21 14:14:45,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-21 14:14:45,246 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:45,247 INFO L422 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:45,461 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:45,462 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:45,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:45,463 INFO L82 PathProgramCache]: Analyzing trace with hash 927992954, now seen corresponding path program 26 times [2020-07-21 14:14:45,463 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:45,463 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1629674750] [2020-07-21 14:14:45,464 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:45,543 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:45,543 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:45,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-21 14:14:45,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:45,756 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:14:45,846 INFO L134 CoverageAnalysis]: Checked inductivity of 1498 backedges. 376 proven. 578 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 14:14:45,846 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:45,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:14:46,386 INFO L134 CoverageAnalysis]: Checked inductivity of 1498 backedges. 376 proven. 578 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 14:14:46,387 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1629674750] [2020-07-21 14:14:46,387 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:46,387 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2020-07-21 14:14:46,387 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383686616] [2020-07-21 14:14:46,388 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 14:14:46,388 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:46,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 14:14:46,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=317, Unknown=0, NotChecked=0, Total=552 [2020-07-21 14:14:46,388 INFO L87 Difference]: Start difference. First operand 160 states and 171 transitions. Second operand 24 states. [2020-07-21 14:14:46,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:46,642 INFO L93 Difference]: Finished difference Result 179 states and 192 transitions. [2020-07-21 14:14:46,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 14:14:46,642 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 189 [2020-07-21 14:14:46,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:46,644 INFO L225 Difference]: With dead ends: 179 [2020-07-21 14:14:46,644 INFO L226 Difference]: Without dead ends: 177 [2020-07-21 14:14:46,644 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 319 SyntacticMatches, 36 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 449 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=239, Invalid=361, Unknown=0, NotChecked=0, Total=600 [2020-07-21 14:14:46,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2020-07-21 14:14:46,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 172. [2020-07-21 14:14:46,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2020-07-21 14:14:46,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 184 transitions. [2020-07-21 14:14:46,654 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 184 transitions. Word has length 189 [2020-07-21 14:14:46,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:46,655 INFO L479 AbstractCegarLoop]: Abstraction has 172 states and 184 transitions. [2020-07-21 14:14:46,655 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 14:14:46,655 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 184 transitions. [2020-07-21 14:14:46,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2020-07-21 14:14:46,656 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:46,657 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 19, 19, 19, 19, 19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:46,871 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:46,872 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:46,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:46,873 INFO L82 PathProgramCache]: Analyzing trace with hash 1753938524, now seen corresponding path program 27 times [2020-07-21 14:14:46,873 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:46,873 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1541672663] [2020-07-21 14:14:46,874 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:46,953 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:46,954 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:46,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 546 conjuncts, 40 conjunts are in the unsatisfiable core [2020-07-21 14:14:46,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:47,714 INFO L134 CoverageAnalysis]: Checked inductivity of 1786 backedges. 828 proven. 342 refuted. 0 times theorem prover too weak. 616 trivial. 0 not checked. [2020-07-21 14:14:47,715 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:48,585 INFO L134 CoverageAnalysis]: Checked inductivity of 1786 backedges. 758 proven. 342 refuted. 0 times theorem prover too weak. 686 trivial. 0 not checked. [2020-07-21 14:14:48,586 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1541672663] [2020-07-21 14:14:48,586 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:48,586 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40] total 59 [2020-07-21 14:14:48,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860550751] [2020-07-21 14:14:48,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-07-21 14:14:48,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:48,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-07-21 14:14:48,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=818, Invalid=2604, Unknown=0, NotChecked=0, Total=3422 [2020-07-21 14:14:48,588 INFO L87 Difference]: Start difference. First operand 172 states and 184 transitions. Second operand 59 states. [2020-07-21 14:14:49,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:49,676 INFO L93 Difference]: Finished difference Result 339 states and 408 transitions. [2020-07-21 14:14:49,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-21 14:14:49,677 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 205 [2020-07-21 14:14:49,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:49,678 INFO L225 Difference]: With dead ends: 339 [2020-07-21 14:14:49,679 INFO L226 Difference]: Without dead ends: 250 [2020-07-21 14:14:49,682 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 428 GetRequests, 333 SyntacticMatches, 19 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1521 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1597, Invalid=4409, Unknown=0, NotChecked=0, Total=6006 [2020-07-21 14:14:49,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-07-21 14:14:49,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 174. [2020-07-21 14:14:49,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2020-07-21 14:14:49,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 186 transitions. [2020-07-21 14:14:49,695 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 186 transitions. Word has length 205 [2020-07-21 14:14:49,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:49,695 INFO L479 AbstractCegarLoop]: Abstraction has 174 states and 186 transitions. [2020-07-21 14:14:49,695 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-07-21 14:14:49,695 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 186 transitions. [2020-07-21 14:14:49,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2020-07-21 14:14:49,697 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:49,697 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 19, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:49,910 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:49,911 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:49,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:49,911 INFO L82 PathProgramCache]: Analyzing trace with hash 1542073473, now seen corresponding path program 28 times [2020-07-21 14:14:49,911 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:49,912 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [799551303] [2020-07-21 14:14:49,912 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:50,000 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:50,000 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:50,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 42 conjunts are in the unsatisfiable core [2020-07-21 14:14:50,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:50,898 INFO L134 CoverageAnalysis]: Checked inductivity of 1824 backedges. 760 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 14:14:50,898 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:51,991 INFO L134 CoverageAnalysis]: Checked inductivity of 1824 backedges. 760 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 14:14:51,992 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [799551303] [2020-07-21 14:14:51,992 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:51,992 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42] total 62 [2020-07-21 14:14:51,992 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091046285] [2020-07-21 14:14:51,993 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-07-21 14:14:51,993 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:51,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-07-21 14:14:51,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=901, Invalid=2881, Unknown=0, NotChecked=0, Total=3782 [2020-07-21 14:14:51,994 INFO L87 Difference]: Start difference. First operand 174 states and 186 transitions. Second operand 62 states. [2020-07-21 14:14:53,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:53,212 INFO L93 Difference]: Finished difference Result 343 states and 415 transitions. [2020-07-21 14:14:53,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-21 14:14:53,212 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 207 [2020-07-21 14:14:53,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:53,214 INFO L225 Difference]: With dead ends: 343 [2020-07-21 14:14:53,214 INFO L226 Difference]: Without dead ends: 256 [2020-07-21 14:14:53,215 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 333 SyntacticMatches, 20 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1691 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1761, Invalid=4881, Unknown=0, NotChecked=0, Total=6642 [2020-07-21 14:14:53,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2020-07-21 14:14:53,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 176. [2020-07-21 14:14:53,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-21 14:14:53,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 188 transitions. [2020-07-21 14:14:53,224 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 188 transitions. Word has length 207 [2020-07-21 14:14:53,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:53,224 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 188 transitions. [2020-07-21 14:14:53,224 INFO L480 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-07-21 14:14:53,225 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 188 transitions. [2020-07-21 14:14:53,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2020-07-21 14:14:53,226 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:53,226 INFO L422 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:53,439 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:53,440 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:53,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:53,441 INFO L82 PathProgramCache]: Analyzing trace with hash -196777626, now seen corresponding path program 29 times [2020-07-21 14:14:53,441 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:53,441 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1470275741] [2020-07-21 14:14:53,441 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:53,527 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:53,527 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:53,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 566 conjuncts, 43 conjunts are in the unsatisfiable core [2020-07-21 14:14:53,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:53,814 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:14:53,868 INFO L134 CoverageAnalysis]: Checked inductivity of 1864 backedges. 458 proven. 722 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 14:14:53,868 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:53,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:14:54,420 INFO L134 CoverageAnalysis]: Checked inductivity of 1864 backedges. 458 proven. 722 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 14:14:54,420 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1470275741] [2020-07-21 14:14:54,420 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:54,420 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2020-07-21 14:14:54,420 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1207442545] [2020-07-21 14:14:54,421 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 14:14:54,421 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:54,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 14:14:54,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=370, Unknown=0, NotChecked=0, Total=650 [2020-07-21 14:14:54,422 INFO L87 Difference]: Start difference. First operand 176 states and 188 transitions. Second operand 26 states. [2020-07-21 14:14:54,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:54,689 INFO L93 Difference]: Finished difference Result 195 states and 209 transitions. [2020-07-21 14:14:54,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 14:14:54,690 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 209 [2020-07-21 14:14:54,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:54,692 INFO L225 Difference]: With dead ends: 195 [2020-07-21 14:14:54,692 INFO L226 Difference]: Without dead ends: 193 [2020-07-21 14:14:54,693 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 353 SyntacticMatches, 40 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=284, Invalid=418, Unknown=0, NotChecked=0, Total=702 [2020-07-21 14:14:54,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2020-07-21 14:14:54,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 188. [2020-07-21 14:14:54,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2020-07-21 14:14:54,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 201 transitions. [2020-07-21 14:14:54,703 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 201 transitions. Word has length 209 [2020-07-21 14:14:54,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:54,704 INFO L479 AbstractCegarLoop]: Abstraction has 188 states and 201 transitions. [2020-07-21 14:14:54,704 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 14:14:54,704 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 201 transitions. [2020-07-21 14:14:54,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2020-07-21 14:14:54,705 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:54,705 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 21, 21, 21, 21, 21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:54,919 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:54,920 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:54,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:54,920 INFO L82 PathProgramCache]: Analyzing trace with hash 65077064, now seen corresponding path program 30 times [2020-07-21 14:14:54,920 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:54,920 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1155743365] [2020-07-21 14:14:54,920 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:55,011 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:55,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:55,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 600 conjuncts, 44 conjunts are in the unsatisfiable core [2020-07-21 14:14:55,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:55,933 INFO L134 CoverageAnalysis]: Checked inductivity of 2184 backedges. 1000 proven. 420 refuted. 0 times theorem prover too weak. 764 trivial. 0 not checked. [2020-07-21 14:14:55,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:56,987 INFO L134 CoverageAnalysis]: Checked inductivity of 2184 backedges. 922 proven. 420 refuted. 0 times theorem prover too weak. 842 trivial. 0 not checked. [2020-07-21 14:14:56,987 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1155743365] [2020-07-21 14:14:56,987 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:14:56,987 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44] total 65 [2020-07-21 14:14:56,987 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [692892123] [2020-07-21 14:14:56,988 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2020-07-21 14:14:56,988 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:56,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2020-07-21 14:14:56,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=988, Invalid=3172, Unknown=0, NotChecked=0, Total=4160 [2020-07-21 14:14:56,989 INFO L87 Difference]: Start difference. First operand 188 states and 201 transitions. Second operand 65 states. [2020-07-21 14:14:58,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:58,275 INFO L93 Difference]: Finished difference Result 371 states and 447 transitions. [2020-07-21 14:14:58,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-21 14:14:58,275 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 225 [2020-07-21 14:14:58,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:58,277 INFO L225 Difference]: With dead ends: 371 [2020-07-21 14:14:58,277 INFO L226 Difference]: Without dead ends: 274 [2020-07-21 14:14:58,278 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 365 SyntacticMatches, 21 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1870 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1933, Invalid=5377, Unknown=0, NotChecked=0, Total=7310 [2020-07-21 14:14:58,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-07-21 14:14:58,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 190. [2020-07-21 14:14:58,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-21 14:14:58,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 203 transitions. [2020-07-21 14:14:58,288 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 203 transitions. Word has length 225 [2020-07-21 14:14:58,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:58,289 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 203 transitions. [2020-07-21 14:14:58,289 INFO L480 AbstractCegarLoop]: Interpolant automaton has 65 states. [2020-07-21 14:14:58,289 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 203 transitions. [2020-07-21 14:14:58,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2020-07-21 14:14:58,290 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:58,290 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:58,505 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:58,506 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:58,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:58,507 INFO L82 PathProgramCache]: Analyzing trace with hash 1137618157, now seen corresponding path program 31 times [2020-07-21 14:14:58,507 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:58,507 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [420664095] [2020-07-21 14:14:58,507 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:58,599 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:58,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:58,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 610 conjuncts, 46 conjunts are in the unsatisfiable core [2020-07-21 14:14:58,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:59,597 INFO L134 CoverageAnalysis]: Checked inductivity of 2226 backedges. 924 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 14:14:59,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:00,757 INFO L134 CoverageAnalysis]: Checked inductivity of 2226 backedges. 924 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 14:15:00,757 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [420664095] [2020-07-21 14:15:00,758 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:00,758 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46] total 68 [2020-07-21 14:15:00,758 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405479951] [2020-07-21 14:15:00,759 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-21 14:15:00,759 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:00,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-21 14:15:00,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1079, Invalid=3477, Unknown=0, NotChecked=0, Total=4556 [2020-07-21 14:15:00,760 INFO L87 Difference]: Start difference. First operand 190 states and 203 transitions. Second operand 68 states. [2020-07-21 14:15:02,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:02,211 INFO L93 Difference]: Finished difference Result 375 states and 454 transitions. [2020-07-21 14:15:02,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-21 14:15:02,212 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 227 [2020-07-21 14:15:02,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:02,213 INFO L225 Difference]: With dead ends: 375 [2020-07-21 14:15:02,214 INFO L226 Difference]: Without dead ends: 280 [2020-07-21 14:15:02,215 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 365 SyntacticMatches, 22 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2058 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2113, Invalid=5897, Unknown=0, NotChecked=0, Total=8010 [2020-07-21 14:15:02,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2020-07-21 14:15:02,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 192. [2020-07-21 14:15:02,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2020-07-21 14:15:02,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 205 transitions. [2020-07-21 14:15:02,226 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 205 transitions. Word has length 227 [2020-07-21 14:15:02,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:02,226 INFO L479 AbstractCegarLoop]: Abstraction has 192 states and 205 transitions. [2020-07-21 14:15:02,226 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-21 14:15:02,226 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 205 transitions. [2020-07-21 14:15:02,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2020-07-21 14:15:02,228 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:02,228 INFO L422 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:02,440 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:02,441 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:02,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:02,441 INFO L82 PathProgramCache]: Analyzing trace with hash 1057457490, now seen corresponding path program 32 times [2020-07-21 14:15:02,441 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:02,441 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1142060831] [2020-07-21 14:15:02,442 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:02,536 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:02,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:02,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 620 conjuncts, 47 conjunts are in the unsatisfiable core [2020-07-21 14:15:02,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:02,881 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:15:02,951 INFO L134 CoverageAnalysis]: Checked inductivity of 2270 backedges. 548 proven. 882 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 14:15:02,951 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:02,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:15:03,651 INFO L134 CoverageAnalysis]: Checked inductivity of 2270 backedges. 548 proven. 882 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 14:15:03,651 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1142060831] [2020-07-21 14:15:03,651 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:03,652 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 28 [2020-07-21 14:15:03,652 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511285842] [2020-07-21 14:15:03,652 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-21 14:15:03,652 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:03,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-21 14:15:03,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=427, Unknown=0, NotChecked=0, Total=756 [2020-07-21 14:15:03,653 INFO L87 Difference]: Start difference. First operand 192 states and 205 transitions. Second operand 28 states. [2020-07-21 14:15:03,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:03,914 INFO L93 Difference]: Finished difference Result 211 states and 226 transitions. [2020-07-21 14:15:03,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-21 14:15:03,915 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 229 [2020-07-21 14:15:03,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:03,916 INFO L225 Difference]: With dead ends: 211 [2020-07-21 14:15:03,916 INFO L226 Difference]: Without dead ends: 209 [2020-07-21 14:15:03,916 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 387 SyntacticMatches, 44 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 637 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=333, Invalid=479, Unknown=0, NotChecked=0, Total=812 [2020-07-21 14:15:03,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-07-21 14:15:03,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 204. [2020-07-21 14:15:03,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-07-21 14:15:03,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 218 transitions. [2020-07-21 14:15:03,926 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 218 transitions. Word has length 229 [2020-07-21 14:15:03,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:03,927 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 218 transitions. [2020-07-21 14:15:03,927 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-21 14:15:03,927 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 218 transitions. [2020-07-21 14:15:03,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2020-07-21 14:15:03,928 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:03,929 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 23, 23, 23, 23, 23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:04,142 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:04,143 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:04,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:04,144 INFO L82 PathProgramCache]: Analyzing trace with hash -777665740, now seen corresponding path program 33 times [2020-07-21 14:15:04,144 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:04,144 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [877794240] [2020-07-21 14:15:04,144 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:04,243 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:04,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:04,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 654 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-21 14:15:04,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:05,347 INFO L134 CoverageAnalysis]: Checked inductivity of 2622 backedges. 1188 proven. 506 refuted. 0 times theorem prover too weak. 928 trivial. 0 not checked. [2020-07-21 14:15:05,347 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:06,677 INFO L134 CoverageAnalysis]: Checked inductivity of 2622 backedges. 1102 proven. 506 refuted. 0 times theorem prover too weak. 1014 trivial. 0 not checked. [2020-07-21 14:15:06,678 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [877794240] [2020-07-21 14:15:06,678 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:06,678 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48] total 71 [2020-07-21 14:15:06,678 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722595272] [2020-07-21 14:15:06,679 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2020-07-21 14:15:06,679 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:06,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2020-07-21 14:15:06,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1174, Invalid=3796, Unknown=0, NotChecked=0, Total=4970 [2020-07-21 14:15:06,680 INFO L87 Difference]: Start difference. First operand 204 states and 218 transitions. Second operand 71 states. [2020-07-21 14:15:08,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:08,211 INFO L93 Difference]: Finished difference Result 403 states and 486 transitions. [2020-07-21 14:15:08,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 14:15:08,212 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 245 [2020-07-21 14:15:08,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:08,213 INFO L225 Difference]: With dead ends: 403 [2020-07-21 14:15:08,213 INFO L226 Difference]: Without dead ends: 298 [2020-07-21 14:15:08,215 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 397 SyntacticMatches, 23 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2255 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2301, Invalid=6441, Unknown=0, NotChecked=0, Total=8742 [2020-07-21 14:15:08,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2020-07-21 14:15:08,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 206. [2020-07-21 14:15:08,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2020-07-21 14:15:08,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 220 transitions. [2020-07-21 14:15:08,225 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 220 transitions. Word has length 245 [2020-07-21 14:15:08,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:08,226 INFO L479 AbstractCegarLoop]: Abstraction has 206 states and 220 transitions. [2020-07-21 14:15:08,226 INFO L480 AbstractCegarLoop]: Interpolant automaton has 71 states. [2020-07-21 14:15:08,226 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 220 transitions. [2020-07-21 14:15:08,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2020-07-21 14:15:08,227 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:08,227 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 23, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:08,442 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:08,442 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:08,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:08,443 INFO L82 PathProgramCache]: Analyzing trace with hash 1435577433, now seen corresponding path program 34 times [2020-07-21 14:15:08,443 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:08,443 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [321136698] [2020-07-21 14:15:08,444 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:08,547 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:08,547 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:08,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 664 conjuncts, 50 conjunts are in the unsatisfiable core [2020-07-21 14:15:08,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:09,732 INFO L134 CoverageAnalysis]: Checked inductivity of 2668 backedges. 1104 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 14:15:09,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:11,120 INFO L134 CoverageAnalysis]: Checked inductivity of 2668 backedges. 1104 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 14:15:11,121 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [321136698] [2020-07-21 14:15:11,121 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:11,121 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50] total 74 [2020-07-21 14:15:11,121 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [815985673] [2020-07-21 14:15:11,122 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2020-07-21 14:15:11,122 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:11,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2020-07-21 14:15:11,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1273, Invalid=4129, Unknown=0, NotChecked=0, Total=5402 [2020-07-21 14:15:11,123 INFO L87 Difference]: Start difference. First operand 206 states and 220 transitions. Second operand 74 states. [2020-07-21 14:15:12,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:12,804 INFO L93 Difference]: Finished difference Result 407 states and 493 transitions. [2020-07-21 14:15:12,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-21 14:15:12,804 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 247 [2020-07-21 14:15:12,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:12,806 INFO L225 Difference]: With dead ends: 407 [2020-07-21 14:15:12,806 INFO L226 Difference]: Without dead ends: 304 [2020-07-21 14:15:12,807 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 397 SyntacticMatches, 24 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2461 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2497, Invalid=7009, Unknown=0, NotChecked=0, Total=9506 [2020-07-21 14:15:12,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2020-07-21 14:15:12,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 208. [2020-07-21 14:15:12,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2020-07-21 14:15:12,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 222 transitions. [2020-07-21 14:15:12,817 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 222 transitions. Word has length 247 [2020-07-21 14:15:12,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:12,818 INFO L479 AbstractCegarLoop]: Abstraction has 208 states and 222 transitions. [2020-07-21 14:15:12,818 INFO L480 AbstractCegarLoop]: Interpolant automaton has 74 states. [2020-07-21 14:15:12,818 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 222 transitions. [2020-07-21 14:15:12,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2020-07-21 14:15:12,819 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:12,820 INFO L422 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:13,033 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:13,034 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:13,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:13,035 INFO L82 PathProgramCache]: Analyzing trace with hash -1941512130, now seen corresponding path program 35 times [2020-07-21 14:15:13,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:13,035 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [365095266] [2020-07-21 14:15:13,036 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:13,135 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:13,135 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:13,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 674 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-21 14:15:13,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:13,531 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:15:13,597 INFO L134 CoverageAnalysis]: Checked inductivity of 2716 backedges. 646 proven. 1058 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 14:15:13,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:13,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:15:14,418 INFO L134 CoverageAnalysis]: Checked inductivity of 2716 backedges. 646 proven. 1058 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 14:15:14,419 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [365095266] [2020-07-21 14:15:14,419 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:14,419 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 30 [2020-07-21 14:15:14,419 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1507148957] [2020-07-21 14:15:14,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-21 14:15:14,420 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:14,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-21 14:15:14,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=488, Unknown=0, NotChecked=0, Total=870 [2020-07-21 14:15:14,420 INFO L87 Difference]: Start difference. First operand 208 states and 222 transitions. Second operand 30 states. [2020-07-21 14:15:14,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:14,719 INFO L93 Difference]: Finished difference Result 227 states and 243 transitions. [2020-07-21 14:15:14,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-21 14:15:14,720 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 249 [2020-07-21 14:15:14,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:14,721 INFO L225 Difference]: With dead ends: 227 [2020-07-21 14:15:14,721 INFO L226 Difference]: Without dead ends: 225 [2020-07-21 14:15:14,722 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 421 SyntacticMatches, 48 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 743 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=386, Invalid=544, Unknown=0, NotChecked=0, Total=930 [2020-07-21 14:15:14,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2020-07-21 14:15:14,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 220. [2020-07-21 14:15:14,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2020-07-21 14:15:14,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 235 transitions. [2020-07-21 14:15:14,732 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 235 transitions. Word has length 249 [2020-07-21 14:15:14,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:14,732 INFO L479 AbstractCegarLoop]: Abstraction has 220 states and 235 transitions. [2020-07-21 14:15:14,733 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-21 14:15:14,733 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 235 transitions. [2020-07-21 14:15:14,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2020-07-21 14:15:14,734 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:14,734 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 26, 25, 25, 25, 25, 25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:14,947 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:14,948 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:14,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:14,949 INFO L82 PathProgramCache]: Analyzing trace with hash -712391136, now seen corresponding path program 36 times [2020-07-21 14:15:14,949 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:14,949 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [863546681] [2020-07-21 14:15:14,949 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:15,055 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:15,055 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:15,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 708 conjuncts, 52 conjunts are in the unsatisfiable core [2020-07-21 14:15:15,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:16,356 INFO L134 CoverageAnalysis]: Checked inductivity of 3100 backedges. 1392 proven. 600 refuted. 0 times theorem prover too weak. 1108 trivial. 0 not checked. [2020-07-21 14:15:16,356 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:17,865 INFO L134 CoverageAnalysis]: Checked inductivity of 3100 backedges. 1298 proven. 600 refuted. 0 times theorem prover too weak. 1202 trivial. 0 not checked. [2020-07-21 14:15:17,866 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [863546681] [2020-07-21 14:15:17,866 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:17,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52] total 77 [2020-07-21 14:15:17,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422668857] [2020-07-21 14:15:17,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2020-07-21 14:15:17,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:17,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2020-07-21 14:15:17,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1376, Invalid=4476, Unknown=0, NotChecked=0, Total=5852 [2020-07-21 14:15:17,867 INFO L87 Difference]: Start difference. First operand 220 states and 235 transitions. Second operand 77 states. [2020-07-21 14:15:19,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:19,655 INFO L93 Difference]: Finished difference Result 435 states and 525 transitions. [2020-07-21 14:15:19,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-21 14:15:19,656 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 265 [2020-07-21 14:15:19,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:19,657 INFO L225 Difference]: With dead ends: 435 [2020-07-21 14:15:19,657 INFO L226 Difference]: Without dead ends: 322 [2020-07-21 14:15:19,658 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 554 GetRequests, 429 SyntacticMatches, 25 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2676 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=2701, Invalid=7601, Unknown=0, NotChecked=0, Total=10302 [2020-07-21 14:15:19,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2020-07-21 14:15:19,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 222. [2020-07-21 14:15:19,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2020-07-21 14:15:19,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 237 transitions. [2020-07-21 14:15:19,669 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 237 transitions. Word has length 265 [2020-07-21 14:15:19,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:19,669 INFO L479 AbstractCegarLoop]: Abstraction has 222 states and 237 transitions. [2020-07-21 14:15:19,669 INFO L480 AbstractCegarLoop]: Interpolant automaton has 77 states. [2020-07-21 14:15:19,670 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 237 transitions. [2020-07-21 14:15:19,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 268 [2020-07-21 14:15:19,671 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:19,671 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 25, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:19,884 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:19,885 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:19,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:19,886 INFO L82 PathProgramCache]: Analyzing trace with hash -993908027, now seen corresponding path program 37 times [2020-07-21 14:15:19,886 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:19,886 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1325492251] [2020-07-21 14:15:19,886 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:20,001 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:20,001 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:20,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 718 conjuncts, 54 conjunts are in the unsatisfiable core [2020-07-21 14:15:20,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:21,414 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 1300 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 14:15:21,415 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:23,082 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 1300 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 14:15:23,082 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1325492251] [2020-07-21 14:15:23,082 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:23,082 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54] total 80 [2020-07-21 14:15:23,082 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077789455] [2020-07-21 14:15:23,083 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2020-07-21 14:15:23,083 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:23,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2020-07-21 14:15:23,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1483, Invalid=4837, Unknown=0, NotChecked=0, Total=6320 [2020-07-21 14:15:23,084 INFO L87 Difference]: Start difference. First operand 222 states and 237 transitions. Second operand 80 states. [2020-07-21 14:15:24,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:24,985 INFO L93 Difference]: Finished difference Result 439 states and 532 transitions. [2020-07-21 14:15:24,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-21 14:15:24,985 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 267 [2020-07-21 14:15:24,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:24,987 INFO L225 Difference]: With dead ends: 439 [2020-07-21 14:15:24,987 INFO L226 Difference]: Without dead ends: 328 [2020-07-21 14:15:24,989 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 559 GetRequests, 429 SyntacticMatches, 26 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2900 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=2913, Invalid=8217, Unknown=0, NotChecked=0, Total=11130 [2020-07-21 14:15:24,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2020-07-21 14:15:24,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 224. [2020-07-21 14:15:24,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2020-07-21 14:15:24,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 239 transitions. [2020-07-21 14:15:25,000 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 239 transitions. Word has length 267 [2020-07-21 14:15:25,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:25,000 INFO L479 AbstractCegarLoop]: Abstraction has 224 states and 239 transitions. [2020-07-21 14:15:25,000 INFO L480 AbstractCegarLoop]: Interpolant automaton has 80 states. [2020-07-21 14:15:25,000 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 239 transitions. [2020-07-21 14:15:25,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2020-07-21 14:15:25,002 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:25,002 INFO L422 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:25,216 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:25,217 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:25,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:25,217 INFO L82 PathProgramCache]: Analyzing trace with hash -948700630, now seen corresponding path program 38 times [2020-07-21 14:15:25,218 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:25,218 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [215652922] [2020-07-21 14:15:25,218 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:15:25,317 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:25,317 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:25,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 728 conjuncts, 55 conjunts are in the unsatisfiable core [2020-07-21 14:15:25,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:25,821 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:15:25,896 INFO L134 CoverageAnalysis]: Checked inductivity of 3202 backedges. 752 proven. 1250 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 14:15:25,896 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:25,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:15:26,856 INFO L134 CoverageAnalysis]: Checked inductivity of 3202 backedges. 752 proven. 1250 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 14:15:26,857 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [215652922] [2020-07-21 14:15:26,857 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:26,857 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 32 [2020-07-21 14:15:26,857 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1450776872] [2020-07-21 14:15:26,858 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-21 14:15:26,858 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:26,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-21 14:15:26,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=439, Invalid=553, Unknown=0, NotChecked=0, Total=992 [2020-07-21 14:15:26,859 INFO L87 Difference]: Start difference. First operand 224 states and 239 transitions. Second operand 32 states. [2020-07-21 14:15:27,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:27,220 INFO L93 Difference]: Finished difference Result 243 states and 260 transitions. [2020-07-21 14:15:27,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 14:15:27,233 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 269 [2020-07-21 14:15:27,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:27,235 INFO L225 Difference]: With dead ends: 243 [2020-07-21 14:15:27,235 INFO L226 Difference]: Without dead ends: 241 [2020-07-21 14:15:27,235 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 538 GetRequests, 455 SyntacticMatches, 52 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 857 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=443, Invalid=613, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 14:15:27,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2020-07-21 14:15:27,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 236. [2020-07-21 14:15:27,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 236 states. [2020-07-21 14:15:27,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 252 transitions. [2020-07-21 14:15:27,246 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 252 transitions. Word has length 269 [2020-07-21 14:15:27,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:27,249 INFO L479 AbstractCegarLoop]: Abstraction has 236 states and 252 transitions. [2020-07-21 14:15:27,249 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-21 14:15:27,249 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 252 transitions. [2020-07-21 14:15:27,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2020-07-21 14:15:27,251 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:27,251 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 27, 27, 27, 27, 27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:27,463 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:27,464 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:27,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:27,464 INFO L82 PathProgramCache]: Analyzing trace with hash 167610380, now seen corresponding path program 39 times [2020-07-21 14:15:27,464 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:27,464 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1853616697] [2020-07-21 14:15:27,464 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:15:27,573 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:27,574 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:27,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 762 conjuncts, 56 conjunts are in the unsatisfiable core [2020-07-21 14:15:27,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:29,159 INFO L134 CoverageAnalysis]: Checked inductivity of 3618 backedges. 1612 proven. 702 refuted. 0 times theorem prover too weak. 1304 trivial. 0 not checked. [2020-07-21 14:15:29,159 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:31,006 INFO L134 CoverageAnalysis]: Checked inductivity of 3618 backedges. 1510 proven. 702 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2020-07-21 14:15:31,007 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1853616697] [2020-07-21 14:15:31,007 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:31,007 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56] total 83 [2020-07-21 14:15:31,007 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105615433] [2020-07-21 14:15:31,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2020-07-21 14:15:31,008 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:31,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2020-07-21 14:15:31,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1594, Invalid=5212, Unknown=0, NotChecked=0, Total=6806 [2020-07-21 14:15:31,009 INFO L87 Difference]: Start difference. First operand 236 states and 252 transitions. Second operand 83 states. [2020-07-21 14:15:33,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:33,096 INFO L93 Difference]: Finished difference Result 467 states and 564 transitions. [2020-07-21 14:15:33,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-07-21 14:15:33,096 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 285 [2020-07-21 14:15:33,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:33,098 INFO L225 Difference]: With dead ends: 467 [2020-07-21 14:15:33,098 INFO L226 Difference]: Without dead ends: 346 [2020-07-21 14:15:33,099 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 596 GetRequests, 461 SyntacticMatches, 27 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3133 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=3133, Invalid=8857, Unknown=0, NotChecked=0, Total=11990 [2020-07-21 14:15:33,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2020-07-21 14:15:33,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 238. [2020-07-21 14:15:33,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2020-07-21 14:15:33,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 254 transitions. [2020-07-21 14:15:33,111 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 254 transitions. Word has length 285 [2020-07-21 14:15:33,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:33,112 INFO L479 AbstractCegarLoop]: Abstraction has 238 states and 254 transitions. [2020-07-21 14:15:33,112 INFO L480 AbstractCegarLoop]: Interpolant automaton has 83 states. [2020-07-21 14:15:33,112 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 254 transitions. [2020-07-21 14:15:33,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2020-07-21 14:15:33,114 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:33,114 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 27, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:33,328 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:33,329 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:33,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:33,330 INFO L82 PathProgramCache]: Analyzing trace with hash 196225073, now seen corresponding path program 40 times [2020-07-21 14:15:33,330 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:33,331 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [548372001] [2020-07-21 14:15:33,331 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:15:33,442 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:33,442 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:33,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 772 conjuncts, 58 conjunts are in the unsatisfiable core [2020-07-21 14:15:33,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:35,107 INFO L134 CoverageAnalysis]: Checked inductivity of 3672 backedges. 1512 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 14:15:35,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:37,074 INFO L134 CoverageAnalysis]: Checked inductivity of 3672 backedges. 1512 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 14:15:37,075 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [548372001] [2020-07-21 14:15:37,075 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:37,075 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58] total 86 [2020-07-21 14:15:37,075 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084158572] [2020-07-21 14:15:37,076 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2020-07-21 14:15:37,076 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:37,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2020-07-21 14:15:37,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1709, Invalid=5601, Unknown=0, NotChecked=0, Total=7310 [2020-07-21 14:15:37,077 INFO L87 Difference]: Start difference. First operand 238 states and 254 transitions. Second operand 86 states. [2020-07-21 14:15:39,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:39,315 INFO L93 Difference]: Finished difference Result 471 states and 571 transitions. [2020-07-21 14:15:39,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-07-21 14:15:39,315 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 287 [2020-07-21 14:15:39,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:39,317 INFO L225 Difference]: With dead ends: 471 [2020-07-21 14:15:39,317 INFO L226 Difference]: Without dead ends: 352 [2020-07-21 14:15:39,319 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 461 SyntacticMatches, 28 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3375 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=3361, Invalid=9521, Unknown=0, NotChecked=0, Total=12882 [2020-07-21 14:15:39,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2020-07-21 14:15:39,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 240. [2020-07-21 14:15:39,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2020-07-21 14:15:39,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 256 transitions. [2020-07-21 14:15:39,331 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 256 transitions. Word has length 287 [2020-07-21 14:15:39,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:39,332 INFO L479 AbstractCegarLoop]: Abstraction has 240 states and 256 transitions. [2020-07-21 14:15:39,332 INFO L480 AbstractCegarLoop]: Interpolant automaton has 86 states. [2020-07-21 14:15:39,332 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 256 transitions. [2020-07-21 14:15:39,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 290 [2020-07-21 14:15:39,334 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:39,334 INFO L422 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:39,546 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:39,547 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:39,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:39,548 INFO L82 PathProgramCache]: Analyzing trace with hash 1925141270, now seen corresponding path program 41 times [2020-07-21 14:15:39,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:39,549 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [930610267] [2020-07-21 14:15:39,549 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:15:39,656 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:39,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:39,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 782 conjuncts, 59 conjunts are in the unsatisfiable core [2020-07-21 14:15:39,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:40,254 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:15:40,337 INFO L134 CoverageAnalysis]: Checked inductivity of 3728 backedges. 866 proven. 1458 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 14:15:40,338 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:40,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:15:41,549 INFO L134 CoverageAnalysis]: Checked inductivity of 3728 backedges. 866 proven. 1458 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 14:15:41,550 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [930610267] [2020-07-21 14:15:41,550 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:41,550 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 34 [2020-07-21 14:15:41,551 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115972314] [2020-07-21 14:15:41,573 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-21 14:15:41,573 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:41,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-21 14:15:41,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=500, Invalid=622, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 14:15:41,583 INFO L87 Difference]: Start difference. First operand 240 states and 256 transitions. Second operand 34 states. [2020-07-21 14:15:41,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:41,972 INFO L93 Difference]: Finished difference Result 259 states and 277 transitions. [2020-07-21 14:15:41,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 14:15:41,973 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 289 [2020-07-21 14:15:41,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:41,975 INFO L225 Difference]: With dead ends: 259 [2020-07-21 14:15:41,975 INFO L226 Difference]: Without dead ends: 257 [2020-07-21 14:15:41,975 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 489 SyntacticMatches, 56 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 979 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=504, Invalid=686, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 14:15:41,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2020-07-21 14:15:41,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 252. [2020-07-21 14:15:41,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 252 states. [2020-07-21 14:15:41,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 269 transitions. [2020-07-21 14:15:41,987 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 269 transitions. Word has length 289 [2020-07-21 14:15:41,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:41,987 INFO L479 AbstractCegarLoop]: Abstraction has 252 states and 269 transitions. [2020-07-21 14:15:41,988 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-21 14:15:41,988 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 269 transitions. [2020-07-21 14:15:41,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2020-07-21 14:15:41,989 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:41,990 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 29, 29, 29, 29, 29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:42,204 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:42,205 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:42,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:42,205 INFO L82 PathProgramCache]: Analyzing trace with hash -2144237320, now seen corresponding path program 42 times [2020-07-21 14:15:42,205 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:42,205 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1829233204] [2020-07-21 14:15:42,206 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:15:42,322 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:42,322 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:42,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 816 conjuncts, 60 conjunts are in the unsatisfiable core [2020-07-21 14:15:42,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:44,200 INFO L134 CoverageAnalysis]: Checked inductivity of 4176 backedges. 1848 proven. 812 refuted. 0 times theorem prover too weak. 1516 trivial. 0 not checked. [2020-07-21 14:15:44,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:46,346 INFO L134 CoverageAnalysis]: Checked inductivity of 4176 backedges. 1738 proven. 812 refuted. 0 times theorem prover too weak. 1626 trivial. 0 not checked. [2020-07-21 14:15:46,347 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1829233204] [2020-07-21 14:15:46,347 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:46,347 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60] total 89 [2020-07-21 14:15:46,347 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353252854] [2020-07-21 14:15:46,348 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2020-07-21 14:15:46,348 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:46,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2020-07-21 14:15:46,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1828, Invalid=6004, Unknown=0, NotChecked=0, Total=7832 [2020-07-21 14:15:46,349 INFO L87 Difference]: Start difference. First operand 252 states and 269 transitions. Second operand 89 states. [2020-07-21 14:15:48,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:48,803 INFO L93 Difference]: Finished difference Result 499 states and 603 transitions. [2020-07-21 14:15:48,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-07-21 14:15:48,803 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 305 [2020-07-21 14:15:48,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:48,806 INFO L225 Difference]: With dead ends: 499 [2020-07-21 14:15:48,806 INFO L226 Difference]: Without dead ends: 370 [2020-07-21 14:15:48,808 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 638 GetRequests, 493 SyntacticMatches, 29 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3626 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=3597, Invalid=10209, Unknown=0, NotChecked=0, Total=13806 [2020-07-21 14:15:48,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2020-07-21 14:15:48,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 254. [2020-07-21 14:15:48,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2020-07-21 14:15:48,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 271 transitions. [2020-07-21 14:15:48,821 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 271 transitions. Word has length 305 [2020-07-21 14:15:48,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:48,821 INFO L479 AbstractCegarLoop]: Abstraction has 254 states and 271 transitions. [2020-07-21 14:15:48,821 INFO L480 AbstractCegarLoop]: Interpolant automaton has 89 states. [2020-07-21 14:15:48,821 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 271 transitions. [2020-07-21 14:15:48,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 308 [2020-07-21 14:15:48,823 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:48,823 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 29, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:49,036 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:49,037 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:49,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:49,038 INFO L82 PathProgramCache]: Analyzing trace with hash 191997085, now seen corresponding path program 43 times [2020-07-21 14:15:49,038 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:49,038 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1491396076] [2020-07-21 14:15:49,038 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:15:49,156 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:49,156 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:49,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 826 conjuncts, 62 conjunts are in the unsatisfiable core [2020-07-21 14:15:49,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:51,133 INFO L134 CoverageAnalysis]: Checked inductivity of 4234 backedges. 1740 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 14:15:51,133 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:53,478 INFO L134 CoverageAnalysis]: Checked inductivity of 4234 backedges. 1740 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 14:15:53,479 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1491396076] [2020-07-21 14:15:53,479 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:53,479 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62] total 92 [2020-07-21 14:15:53,479 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463153619] [2020-07-21 14:15:53,480 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2020-07-21 14:15:53,480 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:53,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2020-07-21 14:15:53,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1951, Invalid=6421, Unknown=0, NotChecked=0, Total=8372 [2020-07-21 14:15:53,481 INFO L87 Difference]: Start difference. First operand 254 states and 271 transitions. Second operand 92 states. [2020-07-21 14:15:56,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:56,025 INFO L93 Difference]: Finished difference Result 503 states and 610 transitions. [2020-07-21 14:15:56,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2020-07-21 14:15:56,025 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 307 [2020-07-21 14:15:56,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:56,027 INFO L225 Difference]: With dead ends: 503 [2020-07-21 14:15:56,027 INFO L226 Difference]: Without dead ends: 376 [2020-07-21 14:15:56,028 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 643 GetRequests, 493 SyntacticMatches, 30 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3886 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=3841, Invalid=10921, Unknown=0, NotChecked=0, Total=14762 [2020-07-21 14:15:56,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2020-07-21 14:15:56,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 256. [2020-07-21 14:15:56,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2020-07-21 14:15:56,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 273 transitions. [2020-07-21 14:15:56,040 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 273 transitions. Word has length 307 [2020-07-21 14:15:56,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:56,040 INFO L479 AbstractCegarLoop]: Abstraction has 256 states and 273 transitions. [2020-07-21 14:15:56,040 INFO L480 AbstractCegarLoop]: Interpolant automaton has 92 states. [2020-07-21 14:15:56,040 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 273 transitions. [2020-07-21 14:15:56,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2020-07-21 14:15:56,042 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:56,043 INFO L422 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:56,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:56,257 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:56,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:56,257 INFO L82 PathProgramCache]: Analyzing trace with hash -954635518, now seen corresponding path program 44 times [2020-07-21 14:15:56,258 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:56,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1918450196] [2020-07-21 14:15:56,258 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:15:56,371 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:56,372 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:56,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 836 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-21 14:15:56,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:57,032 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:15:57,130 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 988 proven. 1682 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 14:15:57,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:57,174 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:15:58,492 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 988 proven. 1682 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 14:15:58,492 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1918450196] [2020-07-21 14:15:58,492 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:58,493 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 36 [2020-07-21 14:15:58,493 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1829363983] [2020-07-21 14:15:58,493 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 14:15:58,493 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:58,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 14:15:58,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=565, Invalid=695, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 14:15:58,494 INFO L87 Difference]: Start difference. First operand 256 states and 273 transitions. Second operand 36 states. [2020-07-21 14:15:58,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:58,935 INFO L93 Difference]: Finished difference Result 275 states and 294 transitions. [2020-07-21 14:15:58,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 14:15:58,936 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 309 [2020-07-21 14:15:58,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:58,938 INFO L225 Difference]: With dead ends: 275 [2020-07-21 14:15:58,939 INFO L226 Difference]: Without dead ends: 273 [2020-07-21 14:15:58,939 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 618 GetRequests, 523 SyntacticMatches, 60 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1109 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=569, Invalid=763, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 14:15:58,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2020-07-21 14:15:58,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 268. [2020-07-21 14:15:58,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 268 states. [2020-07-21 14:15:58,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 286 transitions. [2020-07-21 14:15:58,952 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 286 transitions. Word has length 309 [2020-07-21 14:15:58,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:58,952 INFO L479 AbstractCegarLoop]: Abstraction has 268 states and 286 transitions. [2020-07-21 14:15:58,952 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 14:15:58,953 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 286 transitions. [2020-07-21 14:15:58,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2020-07-21 14:15:58,955 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:58,955 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 31, 31, 31, 31, 31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:59,168 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:59,169 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:59,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:59,169 INFO L82 PathProgramCache]: Analyzing trace with hash -2146023196, now seen corresponding path program 45 times [2020-07-21 14:15:59,169 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:59,169 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [121059597] [2020-07-21 14:15:59,170 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:15:59,292 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:59,292 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:59,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 870 conjuncts, 64 conjunts are in the unsatisfiable core [2020-07-21 14:15:59,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:16:01,410 INFO L134 CoverageAnalysis]: Checked inductivity of 4774 backedges. 2100 proven. 930 refuted. 0 times theorem prover too weak. 1744 trivial. 0 not checked. [2020-07-21 14:16:01,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:16:03,919 INFO L134 CoverageAnalysis]: Checked inductivity of 4774 backedges. 1982 proven. 930 refuted. 0 times theorem prover too weak. 1862 trivial. 0 not checked. [2020-07-21 14:16:03,919 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [121059597] [2020-07-21 14:16:03,919 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:16:03,919 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64] total 95 [2020-07-21 14:16:03,920 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [801607726] [2020-07-21 14:16:03,921 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2020-07-21 14:16:03,921 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:16:03,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2020-07-21 14:16:03,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2078, Invalid=6852, Unknown=0, NotChecked=0, Total=8930 [2020-07-21 14:16:03,923 INFO L87 Difference]: Start difference. First operand 268 states and 286 transitions. Second operand 95 states. [2020-07-21 14:16:07,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:16:07,907 INFO L93 Difference]: Finished difference Result 531 states and 642 transitions. [2020-07-21 14:16:07,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-21 14:16:07,908 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 325 [2020-07-21 14:16:07,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:16:07,911 INFO L225 Difference]: With dead ends: 531 [2020-07-21 14:16:07,911 INFO L226 Difference]: Without dead ends: 394 [2020-07-21 14:16:07,916 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 680 GetRequests, 525 SyntacticMatches, 31 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4155 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=4093, Invalid=11657, Unknown=0, NotChecked=0, Total=15750 [2020-07-21 14:16:07,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2020-07-21 14:16:07,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 270. [2020-07-21 14:16:07,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 270 states. [2020-07-21 14:16:07,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 288 transitions. [2020-07-21 14:16:07,938 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 288 transitions. Word has length 325 [2020-07-21 14:16:07,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:16:07,938 INFO L479 AbstractCegarLoop]: Abstraction has 270 states and 288 transitions. [2020-07-21 14:16:07,938 INFO L480 AbstractCegarLoop]: Interpolant automaton has 95 states. [2020-07-21 14:16:07,939 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 288 transitions. [2020-07-21 14:16:07,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2020-07-21 14:16:07,942 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:16:07,943 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 31, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:16:08,156 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:08,157 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:16:08,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:16:08,158 INFO L82 PathProgramCache]: Analyzing trace with hash 735125513, now seen corresponding path program 46 times [2020-07-21 14:16:08,158 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:16:08,158 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [335106999] [2020-07-21 14:16:08,159 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:16:08,358 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:16:08,358 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:16:08,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 880 conjuncts, 66 conjunts are in the unsatisfiable core [2020-07-21 14:16:08,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:16:11,532 INFO L134 CoverageAnalysis]: Checked inductivity of 4836 backedges. 1984 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 14:16:11,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:16:14,272 INFO L134 CoverageAnalysis]: Checked inductivity of 4836 backedges. 1984 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 14:16:14,273 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [335106999] [2020-07-21 14:16:14,273 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:16:14,273 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66] total 98 [2020-07-21 14:16:14,273 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [332073984] [2020-07-21 14:16:14,274 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2020-07-21 14:16:14,274 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:16:14,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2020-07-21 14:16:14,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2209, Invalid=7297, Unknown=0, NotChecked=0, Total=9506 [2020-07-21 14:16:14,275 INFO L87 Difference]: Start difference. First operand 270 states and 288 transitions. Second operand 98 states. [2020-07-21 14:16:17,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:16:17,193 INFO L93 Difference]: Finished difference Result 535 states and 649 transitions. [2020-07-21 14:16:17,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2020-07-21 14:16:17,193 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 327 [2020-07-21 14:16:17,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:16:17,195 INFO L225 Difference]: With dead ends: 535 [2020-07-21 14:16:17,195 INFO L226 Difference]: Without dead ends: 400 [2020-07-21 14:16:17,197 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 685 GetRequests, 525 SyntacticMatches, 32 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4433 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=4353, Invalid=12417, Unknown=0, NotChecked=0, Total=16770 [2020-07-21 14:16:17,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400 states. [2020-07-21 14:16:17,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400 to 272. [2020-07-21 14:16:17,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 272 states. [2020-07-21 14:16:17,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 290 transitions. [2020-07-21 14:16:17,211 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 290 transitions. Word has length 327 [2020-07-21 14:16:17,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:16:17,211 INFO L479 AbstractCegarLoop]: Abstraction has 272 states and 290 transitions. [2020-07-21 14:16:17,211 INFO L480 AbstractCegarLoop]: Interpolant automaton has 98 states. [2020-07-21 14:16:17,211 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 290 transitions. [2020-07-21 14:16:17,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 330 [2020-07-21 14:16:17,214 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:16:17,214 INFO L422 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:16:17,428 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:17,429 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:16:17,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:16:17,429 INFO L82 PathProgramCache]: Analyzing trace with hash -734871058, now seen corresponding path program 47 times [2020-07-21 14:16:17,429 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:16:17,429 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1657209878] [2020-07-21 14:16:17,430 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:16:17,554 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:16:17,554 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:16:17,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 890 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-21 14:16:17,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:16:18,314 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:16:18,421 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1118 proven. 1922 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 14:16:18,422 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:16:18,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:16:20,017 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1118 proven. 1922 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 14:16:20,018 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1657209878] [2020-07-21 14:16:20,018 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:16:20,018 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37] total 38 [2020-07-21 14:16:20,018 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [741860249] [2020-07-21 14:16:20,019 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-21 14:16:20,019 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:16:20,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-21 14:16:20,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=634, Invalid=772, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 14:16:20,019 INFO L87 Difference]: Start difference. First operand 272 states and 290 transitions. Second operand 38 states. [2020-07-21 14:16:20,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:16:20,458 INFO L93 Difference]: Finished difference Result 291 states and 311 transitions. [2020-07-21 14:16:20,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 14:16:20,459 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 329 [2020-07-21 14:16:20,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:16:20,461 INFO L225 Difference]: With dead ends: 291 [2020-07-21 14:16:20,462 INFO L226 Difference]: Without dead ends: 289 [2020-07-21 14:16:20,462 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 658 GetRequests, 557 SyntacticMatches, 64 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1247 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=638, Invalid=844, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 14:16:20,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2020-07-21 14:16:20,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 284. [2020-07-21 14:16:20,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 284 states. [2020-07-21 14:16:20,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 303 transitions. [2020-07-21 14:16:20,480 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 303 transitions. Word has length 329 [2020-07-21 14:16:20,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:16:20,480 INFO L479 AbstractCegarLoop]: Abstraction has 284 states and 303 transitions. [2020-07-21 14:16:20,480 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-21 14:16:20,480 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 303 transitions. [2020-07-21 14:16:20,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 346 [2020-07-21 14:16:20,483 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:16:20,483 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 34, 33, 33, 33, 33, 33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:16:20,696 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:20,697 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:16:20,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:16:20,699 INFO L82 PathProgramCache]: Analyzing trace with hash -1470347312, now seen corresponding path program 48 times [2020-07-21 14:16:20,699 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:16:20,699 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1154484833] [2020-07-21 14:16:20,699 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:16:20,838 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:16:20,839 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:16:20,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 924 conjuncts, 68 conjunts are in the unsatisfiable core [2020-07-21 14:16:20,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:16:23,358 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 2368 proven. 1056 refuted. 0 times theorem prover too weak. 1988 trivial. 0 not checked. [2020-07-21 14:16:23,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:16:26,351 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 2242 proven. 1056 refuted. 0 times theorem prover too weak. 2114 trivial. 0 not checked. [2020-07-21 14:16:26,352 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1154484833] [2020-07-21 14:16:26,352 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:16:26,352 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68] total 101 [2020-07-21 14:16:26,352 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448840985] [2020-07-21 14:16:26,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2020-07-21 14:16:26,353 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:16:26,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2020-07-21 14:16:26,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2344, Invalid=7756, Unknown=0, NotChecked=0, Total=10100 [2020-07-21 14:16:26,354 INFO L87 Difference]: Start difference. First operand 284 states and 303 transitions. Second operand 101 states. [2020-07-21 14:16:30,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:16:30,044 INFO L93 Difference]: Finished difference Result 563 states and 681 transitions. [2020-07-21 14:16:30,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2020-07-21 14:16:30,044 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 345 [2020-07-21 14:16:30,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:16:30,046 INFO L225 Difference]: With dead ends: 563 [2020-07-21 14:16:30,046 INFO L226 Difference]: Without dead ends: 418 [2020-07-21 14:16:30,048 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 722 GetRequests, 557 SyntacticMatches, 33 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4720 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=4621, Invalid=13201, Unknown=0, NotChecked=0, Total=17822 [2020-07-21 14:16:30,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2020-07-21 14:16:30,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 286. [2020-07-21 14:16:30,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 286 states. [2020-07-21 14:16:30,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 305 transitions. [2020-07-21 14:16:30,062 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 305 transitions. Word has length 345 [2020-07-21 14:16:30,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:16:30,063 INFO L479 AbstractCegarLoop]: Abstraction has 286 states and 305 transitions. [2020-07-21 14:16:30,063 INFO L480 AbstractCegarLoop]: Interpolant automaton has 101 states. [2020-07-21 14:16:30,063 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 305 transitions. [2020-07-21 14:16:30,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 348 [2020-07-21 14:16:30,065 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:16:30,065 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 33, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:16:30,279 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:30,280 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:16:30,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:16:30,281 INFO L82 PathProgramCache]: Analyzing trace with hash 2069961333, now seen corresponding path program 49 times [2020-07-21 14:16:30,281 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:16:30,282 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [441430905] [2020-07-21 14:16:30,282 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:16:30,412 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:16:30,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:16:30,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 934 conjuncts, 70 conjunts are in the unsatisfiable core [2020-07-21 14:16:30,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:16:33,126 INFO L134 CoverageAnalysis]: Checked inductivity of 5478 backedges. 2244 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 14:16:33,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:16:36,294 INFO L134 CoverageAnalysis]: Checked inductivity of 5478 backedges. 2244 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 14:16:36,295 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [441430905] [2020-07-21 14:16:36,295 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:16:36,295 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70] total 104 [2020-07-21 14:16:36,295 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588401761] [2020-07-21 14:16:36,296 INFO L459 AbstractCegarLoop]: Interpolant automaton has 104 states [2020-07-21 14:16:36,296 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:16:36,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2020-07-21 14:16:36,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2483, Invalid=8229, Unknown=0, NotChecked=0, Total=10712 [2020-07-21 14:16:36,297 INFO L87 Difference]: Start difference. First operand 286 states and 305 transitions. Second operand 104 states. [2020-07-21 14:16:39,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:16:39,851 INFO L93 Difference]: Finished difference Result 567 states and 688 transitions. [2020-07-21 14:16:39,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2020-07-21 14:16:39,851 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 347 [2020-07-21 14:16:39,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:16:39,853 INFO L225 Difference]: With dead ends: 567 [2020-07-21 14:16:39,853 INFO L226 Difference]: Without dead ends: 424 [2020-07-21 14:16:39,855 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 727 GetRequests, 557 SyntacticMatches, 34 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5016 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=4897, Invalid=14009, Unknown=0, NotChecked=0, Total=18906 [2020-07-21 14:16:39,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2020-07-21 14:16:39,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 288. [2020-07-21 14:16:39,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-07-21 14:16:39,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 307 transitions. [2020-07-21 14:16:39,867 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 307 transitions. Word has length 347 [2020-07-21 14:16:39,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:16:39,867 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 307 transitions. [2020-07-21 14:16:39,867 INFO L480 AbstractCegarLoop]: Interpolant automaton has 104 states. [2020-07-21 14:16:39,868 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 307 transitions. [2020-07-21 14:16:39,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 350 [2020-07-21 14:16:39,870 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:16:39,870 INFO L422 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:16:40,083 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:40,084 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:16:40,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:16:40,085 INFO L82 PathProgramCache]: Analyzing trace with hash -1602496550, now seen corresponding path program 50 times [2020-07-21 14:16:40,085 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:16:40,085 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1319567834] [2020-07-21 14:16:40,086 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:16:40,218 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:16:40,218 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:16:40,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 944 conjuncts, 71 conjunts are in the unsatisfiable core [2020-07-21 14:16:40,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:16:41,114 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:16:41,233 INFO L134 CoverageAnalysis]: Checked inductivity of 5546 backedges. 1256 proven. 2178 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 14:16:41,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:16:41,287 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:16:43,121 INFO L134 CoverageAnalysis]: Checked inductivity of 5546 backedges. 1256 proven. 2178 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 14:16:43,121 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1319567834] [2020-07-21 14:16:43,121 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:16:43,122 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39] total 40 [2020-07-21 14:16:43,122 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139373152] [2020-07-21 14:16:43,122 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-21 14:16:43,122 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:16:43,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-21 14:16:43,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=707, Invalid=853, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 14:16:43,123 INFO L87 Difference]: Start difference. First operand 288 states and 307 transitions. Second operand 40 states. [2020-07-21 14:16:43,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:16:43,640 INFO L93 Difference]: Finished difference Result 307 states and 328 transitions. [2020-07-21 14:16:43,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-21 14:16:43,641 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 349 [2020-07-21 14:16:43,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:16:43,643 INFO L225 Difference]: With dead ends: 307 [2020-07-21 14:16:43,643 INFO L226 Difference]: Without dead ends: 305 [2020-07-21 14:16:43,643 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 698 GetRequests, 591 SyntacticMatches, 68 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1393 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=711, Invalid=929, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 14:16:43,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2020-07-21 14:16:43,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 300. [2020-07-21 14:16:43,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 300 states. [2020-07-21 14:16:43,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 320 transitions. [2020-07-21 14:16:43,655 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 320 transitions. Word has length 349 [2020-07-21 14:16:43,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:16:43,655 INFO L479 AbstractCegarLoop]: Abstraction has 300 states and 320 transitions. [2020-07-21 14:16:43,655 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-21 14:16:43,655 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 320 transitions. [2020-07-21 14:16:43,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 366 [2020-07-21 14:16:43,656 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:16:43,657 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 35, 35, 35, 35, 35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:16:43,857 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:43,858 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:16:43,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:16:43,859 INFO L82 PathProgramCache]: Analyzing trace with hash 242484668, now seen corresponding path program 51 times [2020-07-21 14:16:43,859 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:16:43,859 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [480505924] [2020-07-21 14:16:43,859 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:16:44,015 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:16:44,016 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:16:44,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 978 conjuncts, 72 conjunts are in the unsatisfiable core [2020-07-21 14:16:44,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:16:46,970 INFO L134 CoverageAnalysis]: Checked inductivity of 6090 backedges. 2652 proven. 1190 refuted. 0 times theorem prover too weak. 2248 trivial. 0 not checked. [2020-07-21 14:16:46,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:16:50,493 INFO L134 CoverageAnalysis]: Checked inductivity of 6090 backedges. 2518 proven. 1190 refuted. 0 times theorem prover too weak. 2382 trivial. 0 not checked. [2020-07-21 14:16:50,494 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [480505924] [2020-07-21 14:16:50,494 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:16:50,494 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72] total 107 [2020-07-21 14:16:50,494 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [591280723] [2020-07-21 14:16:50,495 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2020-07-21 14:16:50,495 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:16:50,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2020-07-21 14:16:50,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2626, Invalid=8716, Unknown=0, NotChecked=0, Total=11342 [2020-07-21 14:16:50,496 INFO L87 Difference]: Start difference. First operand 300 states and 320 transitions. Second operand 107 states. [2020-07-21 14:16:54,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:16:54,543 INFO L93 Difference]: Finished difference Result 595 states and 720 transitions. [2020-07-21 14:16:54,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2020-07-21 14:16:54,544 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 365 [2020-07-21 14:16:54,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:16:54,545 INFO L225 Difference]: With dead ends: 595 [2020-07-21 14:16:54,546 INFO L226 Difference]: Without dead ends: 442 [2020-07-21 14:16:54,547 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 764 GetRequests, 589 SyntacticMatches, 35 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5321 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=5181, Invalid=14841, Unknown=0, NotChecked=0, Total=20022 [2020-07-21 14:16:54,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2020-07-21 14:16:54,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 302. [2020-07-21 14:16:54,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 302 states. [2020-07-21 14:16:54,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 322 transitions. [2020-07-21 14:16:54,558 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 322 transitions. Word has length 365 [2020-07-21 14:16:54,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:16:54,558 INFO L479 AbstractCegarLoop]: Abstraction has 302 states and 322 transitions. [2020-07-21 14:16:54,558 INFO L480 AbstractCegarLoop]: Interpolant automaton has 107 states. [2020-07-21 14:16:54,558 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 322 transitions. [2020-07-21 14:16:54,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 368 [2020-07-21 14:16:54,560 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:16:54,560 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:16:54,760 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:54,761 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:16:54,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:16:54,762 INFO L82 PathProgramCache]: Analyzing trace with hash -814607391, now seen corresponding path program 52 times [2020-07-21 14:16:54,762 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:16:54,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [931626472] [2020-07-21 14:16:54,763 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:16:54,900 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:16:54,900 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:16:54,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 988 conjuncts, 74 conjunts are in the unsatisfiable core [2020-07-21 14:16:54,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:16:58,034 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 2520 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 14:16:58,034 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:17:01,717 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 2520 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 14:17:01,717 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [931626472] [2020-07-21 14:17:01,717 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:17:01,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74] total 110 [2020-07-21 14:17:01,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965250686] [2020-07-21 14:17:01,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2020-07-21 14:17:01,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:17:01,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2020-07-21 14:17:01,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2773, Invalid=9217, Unknown=0, NotChecked=0, Total=11990 [2020-07-21 14:17:01,720 INFO L87 Difference]: Start difference. First operand 302 states and 322 transitions. Second operand 110 states. [2020-07-21 14:17:06,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:17:06,281 INFO L93 Difference]: Finished difference Result 599 states and 727 transitions. [2020-07-21 14:17:06,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2020-07-21 14:17:06,281 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 367 [2020-07-21 14:17:06,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:17:06,283 INFO L225 Difference]: With dead ends: 599 [2020-07-21 14:17:06,283 INFO L226 Difference]: Without dead ends: 448 [2020-07-21 14:17:06,285 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 769 GetRequests, 589 SyntacticMatches, 36 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5635 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=5473, Invalid=15697, Unknown=0, NotChecked=0, Total=21170 [2020-07-21 14:17:06,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 448 states. [2020-07-21 14:17:06,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 448 to 304. [2020-07-21 14:17:06,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 304 states. [2020-07-21 14:17:06,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 324 transitions. [2020-07-21 14:17:06,301 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 324 transitions. Word has length 367 [2020-07-21 14:17:06,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:17:06,301 INFO L479 AbstractCegarLoop]: Abstraction has 304 states and 324 transitions. [2020-07-21 14:17:06,301 INFO L480 AbstractCegarLoop]: Interpolant automaton has 110 states. [2020-07-21 14:17:06,301 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 324 transitions. [2020-07-21 14:17:06,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 370 [2020-07-21 14:17:06,303 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:17:06,304 INFO L422 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 36, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:17:06,517 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:06,518 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:17:06,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:17:06,519 INFO L82 PathProgramCache]: Analyzing trace with hash 1227173062, now seen corresponding path program 53 times [2020-07-21 14:17:06,519 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:17:06,519 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1238155173] [2020-07-21 14:17:06,519 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:17:06,658 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:17:06,658 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:17:06,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 998 conjuncts, 75 conjunts are in the unsatisfiable core [2020-07-21 14:17:06,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:17:07,675 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:17:07,821 INFO L134 CoverageAnalysis]: Checked inductivity of 6232 backedges. 1402 proven. 2450 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 14:17:07,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:17:07,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:17:09,925 INFO L134 CoverageAnalysis]: Checked inductivity of 6232 backedges. 1402 proven. 2450 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 14:17:09,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1238155173] [2020-07-21 14:17:09,925 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:17:09,925 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41] total 42 [2020-07-21 14:17:09,926 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246068709] [2020-07-21 14:17:09,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-07-21 14:17:09,926 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:17:09,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-07-21 14:17:09,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=784, Invalid=938, Unknown=0, NotChecked=0, Total=1722 [2020-07-21 14:17:09,927 INFO L87 Difference]: Start difference. First operand 304 states and 324 transitions. Second operand 42 states. [2020-07-21 14:17:10,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:17:10,493 INFO L93 Difference]: Finished difference Result 323 states and 345 transitions. [2020-07-21 14:17:10,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-21 14:17:10,494 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 369 [2020-07-21 14:17:10,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:17:10,497 INFO L225 Difference]: With dead ends: 323 [2020-07-21 14:17:10,497 INFO L226 Difference]: Without dead ends: 321 [2020-07-21 14:17:10,497 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 738 GetRequests, 625 SyntacticMatches, 72 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1547 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=788, Invalid=1018, Unknown=0, NotChecked=0, Total=1806 [2020-07-21 14:17:10,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2020-07-21 14:17:10,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 316. [2020-07-21 14:17:10,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 316 states. [2020-07-21 14:17:10,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 337 transitions. [2020-07-21 14:17:10,509 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 337 transitions. Word has length 369 [2020-07-21 14:17:10,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:17:10,509 INFO L479 AbstractCegarLoop]: Abstraction has 316 states and 337 transitions. [2020-07-21 14:17:10,509 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-07-21 14:17:10,509 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 337 transitions. [2020-07-21 14:17:10,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 386 [2020-07-21 14:17:10,511 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:17:10,511 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 38, 37, 37, 37, 37, 37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:17:10,711 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:10,712 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:17:10,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:17:10,713 INFO L82 PathProgramCache]: Analyzing trace with hash 1586365096, now seen corresponding path program 54 times [2020-07-21 14:17:10,713 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:17:10,714 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1782044224] [2020-07-21 14:17:10,714 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:17:10,856 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:17:10,856 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:17:10,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 1032 conjuncts, 76 conjunts are in the unsatisfiable core [2020-07-21 14:17:10,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:17:14,191 INFO L134 CoverageAnalysis]: Checked inductivity of 6808 backedges. 2952 proven. 1332 refuted. 0 times theorem prover too weak. 2524 trivial. 0 not checked. [2020-07-21 14:17:14,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:17:18,133 INFO L134 CoverageAnalysis]: Checked inductivity of 6808 backedges. 2810 proven. 1332 refuted. 0 times theorem prover too weak. 2666 trivial. 0 not checked. [2020-07-21 14:17:18,133 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1782044224] [2020-07-21 14:17:18,133 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:17:18,133 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76] total 113 [2020-07-21 14:17:18,133 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27904449] [2020-07-21 14:17:18,134 INFO L459 AbstractCegarLoop]: Interpolant automaton has 113 states [2020-07-21 14:17:18,134 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:17:18,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2020-07-21 14:17:18,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2924, Invalid=9732, Unknown=0, NotChecked=0, Total=12656 [2020-07-21 14:17:18,135 INFO L87 Difference]: Start difference. First operand 316 states and 337 transitions. Second operand 113 states. [2020-07-21 14:17:22,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:17:22,422 INFO L93 Difference]: Finished difference Result 627 states and 759 transitions. [2020-07-21 14:17:22,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2020-07-21 14:17:22,422 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 385 [2020-07-21 14:17:22,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:17:22,424 INFO L225 Difference]: With dead ends: 627 [2020-07-21 14:17:22,424 INFO L226 Difference]: Without dead ends: 466 [2020-07-21 14:17:22,426 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 806 GetRequests, 621 SyntacticMatches, 37 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5958 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=5773, Invalid=16577, Unknown=0, NotChecked=0, Total=22350 [2020-07-21 14:17:22,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2020-07-21 14:17:22,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 318. [2020-07-21 14:17:22,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 318 states. [2020-07-21 14:17:22,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 339 transitions. [2020-07-21 14:17:22,437 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 339 transitions. Word has length 385 [2020-07-21 14:17:22,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:17:22,438 INFO L479 AbstractCegarLoop]: Abstraction has 318 states and 339 transitions. [2020-07-21 14:17:22,438 INFO L480 AbstractCegarLoop]: Interpolant automaton has 113 states. [2020-07-21 14:17:22,438 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 339 transitions. [2020-07-21 14:17:22,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 388 [2020-07-21 14:17:22,439 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:17:22,439 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 37, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:17:22,640 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:22,640 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:17:22,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:17:22,641 INFO L82 PathProgramCache]: Analyzing trace with hash -468415411, now seen corresponding path program 55 times [2020-07-21 14:17:22,641 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:17:22,642 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2139636815] [2020-07-21 14:17:22,642 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:17:22,796 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:17:22,796 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:17:22,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 1042 conjuncts, 78 conjunts are in the unsatisfiable core [2020-07-21 14:17:22,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:17:26,390 INFO L134 CoverageAnalysis]: Checked inductivity of 6882 backedges. 2812 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 14:17:26,390 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:17:30,627 INFO L134 CoverageAnalysis]: Checked inductivity of 6882 backedges. 2812 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 14:17:30,627 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2139636815] [2020-07-21 14:17:30,627 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:17:30,627 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 78] total 116 [2020-07-21 14:17:30,627 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1357194857] [2020-07-21 14:17:30,628 INFO L459 AbstractCegarLoop]: Interpolant automaton has 116 states [2020-07-21 14:17:30,628 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:17:30,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2020-07-21 14:17:30,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3079, Invalid=10261, Unknown=0, NotChecked=0, Total=13340 [2020-07-21 14:17:30,630 INFO L87 Difference]: Start difference. First operand 318 states and 339 transitions. Second operand 116 states. [2020-07-21 14:17:35,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:17:35,253 INFO L93 Difference]: Finished difference Result 631 states and 766 transitions. [2020-07-21 14:17:35,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2020-07-21 14:17:35,253 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 387 [2020-07-21 14:17:35,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:17:35,256 INFO L225 Difference]: With dead ends: 631 [2020-07-21 14:17:35,256 INFO L226 Difference]: Without dead ends: 472 [2020-07-21 14:17:35,257 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 811 GetRequests, 621 SyntacticMatches, 38 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6290 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=6081, Invalid=17481, Unknown=0, NotChecked=0, Total=23562 [2020-07-21 14:17:35,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2020-07-21 14:17:35,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 320. [2020-07-21 14:17:35,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 320 states. [2020-07-21 14:17:35,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 320 states to 320 states and 341 transitions. [2020-07-21 14:17:35,271 INFO L78 Accepts]: Start accepts. Automaton has 320 states and 341 transitions. Word has length 387 [2020-07-21 14:17:35,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:17:35,272 INFO L479 AbstractCegarLoop]: Abstraction has 320 states and 341 transitions. [2020-07-21 14:17:35,272 INFO L480 AbstractCegarLoop]: Interpolant automaton has 116 states. [2020-07-21 14:17:35,272 INFO L276 IsEmpty]: Start isEmpty. Operand 320 states and 341 transitions. [2020-07-21 14:17:35,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2020-07-21 14:17:35,274 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:17:35,274 INFO L422 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 38, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:17:35,488 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:35,489 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:17:35,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:17:35,489 INFO L82 PathProgramCache]: Analyzing trace with hash 572473522, now seen corresponding path program 56 times [2020-07-21 14:17:35,489 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:17:35,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1851794591] [2020-07-21 14:17:35,489 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:17:35,636 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:17:35,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:17:35,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 1052 conjuncts, 79 conjunts are in the unsatisfiable core [2020-07-21 14:17:35,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:17:36,843 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:17:36,983 INFO L134 CoverageAnalysis]: Checked inductivity of 6958 backedges. 1556 proven. 2738 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 14:17:36,983 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:17:37,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:17:39,480 INFO L134 CoverageAnalysis]: Checked inductivity of 6958 backedges. 1556 proven. 2738 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 14:17:39,481 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1851794591] [2020-07-21 14:17:39,481 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:17:39,481 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43] total 44 [2020-07-21 14:17:39,481 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738022867] [2020-07-21 14:17:39,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-21 14:17:39,482 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:17:39,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-21 14:17:39,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=865, Invalid=1027, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 14:17:39,482 INFO L87 Difference]: Start difference. First operand 320 states and 341 transitions. Second operand 44 states. [2020-07-21 14:17:40,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:17:40,322 INFO L93 Difference]: Finished difference Result 339 states and 362 transitions. [2020-07-21 14:17:40,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-21 14:17:40,324 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 389 [2020-07-21 14:17:40,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:17:40,327 INFO L225 Difference]: With dead ends: 339 [2020-07-21 14:17:40,327 INFO L226 Difference]: Without dead ends: 337 [2020-07-21 14:17:40,328 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 778 GetRequests, 659 SyntacticMatches, 76 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1709 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=869, Invalid=1111, Unknown=0, NotChecked=0, Total=1980 [2020-07-21 14:17:40,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2020-07-21 14:17:40,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 332. [2020-07-21 14:17:40,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 332 states. [2020-07-21 14:17:40,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 354 transitions. [2020-07-21 14:17:40,351 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 354 transitions. Word has length 389 [2020-07-21 14:17:40,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:17:40,351 INFO L479 AbstractCegarLoop]: Abstraction has 332 states and 354 transitions. [2020-07-21 14:17:40,351 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-21 14:17:40,352 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 354 transitions. [2020-07-21 14:17:40,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 406 [2020-07-21 14:17:40,354 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:17:40,354 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 40, 39, 39, 39, 39, 39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:17:40,569 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:40,570 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:17:40,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:17:40,570 INFO L82 PathProgramCache]: Analyzing trace with hash -73744748, now seen corresponding path program 57 times [2020-07-21 14:17:40,570 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:17:40,570 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1042708318] [2020-07-21 14:17:40,570 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:17:40,719 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:17:40,719 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:17:40,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 1086 conjuncts, 80 conjunts are in the unsatisfiable core [2020-07-21 14:17:40,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:17:44,630 INFO L134 CoverageAnalysis]: Checked inductivity of 7566 backedges. 3268 proven. 1482 refuted. 0 times theorem prover too weak. 2816 trivial. 0 not checked. [2020-07-21 14:17:44,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:17:49,233 INFO L134 CoverageAnalysis]: Checked inductivity of 7566 backedges. 3118 proven. 1482 refuted. 0 times theorem prover too weak. 2966 trivial. 0 not checked. [2020-07-21 14:17:49,233 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1042708318] [2020-07-21 14:17:49,233 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:17:49,233 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80] total 119 [2020-07-21 14:17:49,234 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937789959] [2020-07-21 14:17:49,234 INFO L459 AbstractCegarLoop]: Interpolant automaton has 119 states [2020-07-21 14:17:49,234 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:17:49,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2020-07-21 14:17:49,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3238, Invalid=10804, Unknown=0, NotChecked=0, Total=14042 [2020-07-21 14:17:49,235 INFO L87 Difference]: Start difference. First operand 332 states and 354 transitions. Second operand 119 states. [2020-07-21 14:17:54,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:17:54,599 INFO L93 Difference]: Finished difference Result 659 states and 798 transitions. [2020-07-21 14:17:54,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2020-07-21 14:17:54,599 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 405 [2020-07-21 14:17:54,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:17:54,601 INFO L225 Difference]: With dead ends: 659 [2020-07-21 14:17:54,601 INFO L226 Difference]: Without dead ends: 490 [2020-07-21 14:17:54,603 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 653 SyntacticMatches, 39 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6631 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=6397, Invalid=18409, Unknown=0, NotChecked=0, Total=24806 [2020-07-21 14:17:54,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2020-07-21 14:17:54,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 334. [2020-07-21 14:17:54,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 334 states. [2020-07-21 14:17:54,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 356 transitions. [2020-07-21 14:17:54,615 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 356 transitions. Word has length 405 [2020-07-21 14:17:54,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:17:54,615 INFO L479 AbstractCegarLoop]: Abstraction has 334 states and 356 transitions. [2020-07-21 14:17:54,615 INFO L480 AbstractCegarLoop]: Interpolant automaton has 119 states. [2020-07-21 14:17:54,615 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 356 transitions. [2020-07-21 14:17:54,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 408 [2020-07-21 14:17:54,617 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:17:54,617 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 40, 40, 39, 39, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:17:54,818 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:54,818 INFO L427 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:17:54,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:17:54,819 INFO L82 PathProgramCache]: Analyzing trace with hash 2082014137, now seen corresponding path program 58 times [2020-07-21 14:17:54,819 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:17:54,820 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [330779737] [2020-07-21 14:17:54,820 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:17:54,968 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:17:54,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:17:54,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 1096 conjuncts, 82 conjunts are in the unsatisfiable core [2020-07-21 14:17:54,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:17:59,195 INFO L134 CoverageAnalysis]: Checked inductivity of 7644 backedges. 3120 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 14:17:59,195 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:18:04,177 INFO L134 CoverageAnalysis]: Checked inductivity of 7644 backedges. 3120 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 14:18:04,177 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [330779737] [2020-07-21 14:18:04,177 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:18:04,178 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [82, 82] total 122 [2020-07-21 14:18:04,178 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087020273] [2020-07-21 14:18:04,178 INFO L459 AbstractCegarLoop]: Interpolant automaton has 122 states [2020-07-21 14:18:04,178 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:18:04,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2020-07-21 14:18:04,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3401, Invalid=11361, Unknown=0, NotChecked=0, Total=14762 [2020-07-21 14:18:04,179 INFO L87 Difference]: Start difference. First operand 334 states and 356 transitions. Second operand 122 states. [2020-07-21 14:18:09,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:18:09,570 INFO L93 Difference]: Finished difference Result 663 states and 805 transitions. [2020-07-21 14:18:09,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2020-07-21 14:18:09,571 INFO L78 Accepts]: Start accepts. Automaton has 122 states. Word has length 407 [2020-07-21 14:18:09,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:18:09,573 INFO L225 Difference]: With dead ends: 663 [2020-07-21 14:18:09,573 INFO L226 Difference]: Without dead ends: 496 [2020-07-21 14:18:09,575 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 853 GetRequests, 653 SyntacticMatches, 40 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6981 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=6721, Invalid=19361, Unknown=0, NotChecked=0, Total=26082 [2020-07-21 14:18:09,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496 states. [2020-07-21 14:18:09,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496 to 336. [2020-07-21 14:18:09,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 336 states. [2020-07-21 14:18:09,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 358 transitions. [2020-07-21 14:18:09,592 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 358 transitions. Word has length 407 [2020-07-21 14:18:09,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:18:09,592 INFO L479 AbstractCegarLoop]: Abstraction has 336 states and 358 transitions. [2020-07-21 14:18:09,592 INFO L480 AbstractCegarLoop]: Interpolant automaton has 122 states. [2020-07-21 14:18:09,592 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 358 transitions. [2020-07-21 14:18:09,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 410 [2020-07-21 14:18:09,595 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:18:09,595 INFO L422 BasicCegarLoop]: trace histogram [41, 40, 40, 40, 40, 39, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:18:09,808 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:18:09,809 INFO L427 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:18:09,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:18:09,810 INFO L82 PathProgramCache]: Analyzing trace with hash -702901346, now seen corresponding path program 59 times [2020-07-21 14:18:09,810 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:18:09,810 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2030583263] [2020-07-21 14:18:09,810 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:18:09,963 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:18:09,963 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:18:09,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 1106 conjuncts, 83 conjunts are in the unsatisfiable core [2020-07-21 14:18:09,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:18:11,411 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:18:11,579 INFO L134 CoverageAnalysis]: Checked inductivity of 7724 backedges. 1718 proven. 3042 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 14:18:11,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:18:11,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:18:14,561 INFO L134 CoverageAnalysis]: Checked inductivity of 7724 backedges. 1718 proven. 3042 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 14:18:14,562 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2030583263] [2020-07-21 14:18:14,562 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:18:14,562 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45] total 46 [2020-07-21 14:18:14,562 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616404911] [2020-07-21 14:18:14,563 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-07-21 14:18:14,563 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:18:14,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-07-21 14:18:14,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=950, Invalid=1120, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 14:18:14,564 INFO L87 Difference]: Start difference. First operand 336 states and 358 transitions. Second operand 46 states. [2020-07-21 14:18:15,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:18:15,300 INFO L93 Difference]: Finished difference Result 355 states and 379 transitions. [2020-07-21 14:18:15,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-21 14:18:15,301 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 409 [2020-07-21 14:18:15,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:18:15,303 INFO L225 Difference]: With dead ends: 355 [2020-07-21 14:18:15,303 INFO L226 Difference]: Without dead ends: 353 [2020-07-21 14:18:15,304 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 818 GetRequests, 693 SyntacticMatches, 80 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1879 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=954, Invalid=1208, Unknown=0, NotChecked=0, Total=2162 [2020-07-21 14:18:15,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2020-07-21 14:18:15,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 348. [2020-07-21 14:18:15,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-21 14:18:15,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 371 transitions. [2020-07-21 14:18:15,319 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 371 transitions. Word has length 409 [2020-07-21 14:18:15,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:18:15,319 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 371 transitions. [2020-07-21 14:18:15,319 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-07-21 14:18:15,319 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 371 transitions. [2020-07-21 14:18:15,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 426 [2020-07-21 14:18:15,321 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:18:15,321 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 41, 41, 41, 41, 41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:18:15,521 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:18:15,522 INFO L427 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:18:15,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:18:15,523 INFO L82 PathProgramCache]: Analyzing trace with hash 524990848, now seen corresponding path program 60 times [2020-07-21 14:18:15,523 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:18:15,523 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1859388700] [2020-07-21 14:18:15,524 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:18:15,683 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:18:15,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:18:15,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 1140 conjuncts, 84 conjunts are in the unsatisfiable core [2020-07-21 14:18:15,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:18:20,483 INFO L134 CoverageAnalysis]: Checked inductivity of 8364 backedges. 3600 proven. 1640 refuted. 0 times theorem prover too weak. 3124 trivial. 0 not checked. [2020-07-21 14:18:20,484 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:18:26,198 INFO L134 CoverageAnalysis]: Checked inductivity of 8364 backedges. 3442 proven. 1640 refuted. 0 times theorem prover too weak. 3282 trivial. 0 not checked. [2020-07-21 14:18:26,198 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1859388700] [2020-07-21 14:18:26,198 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:18:26,199 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84] total 125 [2020-07-21 14:18:26,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615791671] [2020-07-21 14:18:26,199 INFO L459 AbstractCegarLoop]: Interpolant automaton has 125 states [2020-07-21 14:18:26,199 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:18:26,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2020-07-21 14:18:26,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3568, Invalid=11932, Unknown=0, NotChecked=0, Total=15500 [2020-07-21 14:18:26,202 INFO L87 Difference]: Start difference. First operand 348 states and 371 transitions. Second operand 125 states. [2020-07-21 14:18:32,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:18:32,778 INFO L93 Difference]: Finished difference Result 691 states and 837 transitions. [2020-07-21 14:18:32,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2020-07-21 14:18:32,778 INFO L78 Accepts]: Start accepts. Automaton has 125 states. Word has length 425 [2020-07-21 14:18:32,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:18:32,781 INFO L225 Difference]: With dead ends: 691 [2020-07-21 14:18:32,781 INFO L226 Difference]: Without dead ends: 514 [2020-07-21 14:18:32,783 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 890 GetRequests, 685 SyntacticMatches, 41 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7340 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=7053, Invalid=20337, Unknown=0, NotChecked=0, Total=27390 [2020-07-21 14:18:32,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2020-07-21 14:18:32,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 350. [2020-07-21 14:18:32,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 350 states. [2020-07-21 14:18:32,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 373 transitions. [2020-07-21 14:18:32,800 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 373 transitions. Word has length 425 [2020-07-21 14:18:32,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:18:32,800 INFO L479 AbstractCegarLoop]: Abstraction has 350 states and 373 transitions. [2020-07-21 14:18:32,800 INFO L480 AbstractCegarLoop]: Interpolant automaton has 125 states. [2020-07-21 14:18:32,800 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 373 transitions. [2020-07-21 14:18:32,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 428 [2020-07-21 14:18:32,802 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:18:32,802 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 42, 41, 41, 41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:18:33,005 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:18:33,006 INFO L427 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:18:33,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:18:33,007 INFO L82 PathProgramCache]: Analyzing trace with hash -2129659355, now seen corresponding path program 61 times [2020-07-21 14:18:33,007 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:18:33,008 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1779739169] [2020-07-21 14:18:33,008 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:18:33,171 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:18:33,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:18:33,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 1150 conjuncts, 86 conjunts are in the unsatisfiable core [2020-07-21 14:18:33,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:18:38,515 INFO L134 CoverageAnalysis]: Checked inductivity of 8446 backedges. 3444 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 14:18:38,515 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:18:44,942 INFO L134 CoverageAnalysis]: Checked inductivity of 8446 backedges. 3444 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 14:18:44,943 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1779739169] [2020-07-21 14:18:44,943 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:18:44,943 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [86, 86] total 128 [2020-07-21 14:18:44,943 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411395215] [2020-07-21 14:18:44,944 INFO L459 AbstractCegarLoop]: Interpolant automaton has 128 states [2020-07-21 14:18:44,944 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:18:44,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2020-07-21 14:18:44,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3739, Invalid=12517, Unknown=0, NotChecked=0, Total=16256 [2020-07-21 14:18:44,946 INFO L87 Difference]: Start difference. First operand 350 states and 373 transitions. Second operand 128 states. [2020-07-21 14:18:52,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:18:52,309 INFO L93 Difference]: Finished difference Result 695 states and 844 transitions. [2020-07-21 14:18:52,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2020-07-21 14:18:52,310 INFO L78 Accepts]: Start accepts. Automaton has 128 states. Word has length 427 [2020-07-21 14:18:52,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:18:52,312 INFO L225 Difference]: With dead ends: 695 [2020-07-21 14:18:52,313 INFO L226 Difference]: Without dead ends: 520 [2020-07-21 14:18:52,315 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 895 GetRequests, 685 SyntacticMatches, 42 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7708 ImplicationChecksByTransitivity, 14.2s TimeCoverageRelationStatistics Valid=7393, Invalid=21337, Unknown=0, NotChecked=0, Total=28730 [2020-07-21 14:18:52,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2020-07-21 14:18:52,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 352. [2020-07-21 14:18:52,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 352 states. [2020-07-21 14:18:52,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 375 transitions. [2020-07-21 14:18:52,330 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 375 transitions. Word has length 427 [2020-07-21 14:18:52,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:18:52,331 INFO L479 AbstractCegarLoop]: Abstraction has 352 states and 375 transitions. [2020-07-21 14:18:52,331 INFO L480 AbstractCegarLoop]: Interpolant automaton has 128 states. [2020-07-21 14:18:52,331 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 375 transitions. [2020-07-21 14:18:52,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 430 [2020-07-21 14:18:52,334 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:18:52,334 INFO L422 BasicCegarLoop]: trace histogram [43, 42, 42, 42, 42, 41, 41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:18:52,548 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:18:52,549 INFO L427 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:18:52,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:18:52,550 INFO L82 PathProgramCache]: Analyzing trace with hash -2037930614, now seen corresponding path program 62 times [2020-07-21 14:18:52,550 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:18:52,551 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1876483710] [2020-07-21 14:18:52,551 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:18:52,717 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:18:52,717 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:18:52,721 INFO L263 TraceCheckSpWp]: Trace formula consists of 1160 conjuncts, 87 conjunts are in the unsatisfiable core [2020-07-21 14:18:52,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:18:54,625 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:18:54,812 INFO L134 CoverageAnalysis]: Checked inductivity of 8530 backedges. 1888 proven. 3362 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 14:18:54,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:18:54,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:18:58,823 INFO L134 CoverageAnalysis]: Checked inductivity of 8530 backedges. 1888 proven. 3362 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 14:18:58,824 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1876483710] [2020-07-21 14:18:58,824 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:18:58,824 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47] total 48 [2020-07-21 14:18:58,824 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281557519] [2020-07-21 14:18:58,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-21 14:18:58,825 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:18:58,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-21 14:18:58,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1039, Invalid=1217, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 14:18:58,825 INFO L87 Difference]: Start difference. First operand 352 states and 375 transitions. Second operand 48 states. [2020-07-21 14:18:59,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:18:59,789 INFO L93 Difference]: Finished difference Result 371 states and 396 transitions. [2020-07-21 14:18:59,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 14:18:59,791 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 429 [2020-07-21 14:18:59,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:18:59,794 INFO L225 Difference]: With dead ends: 371 [2020-07-21 14:18:59,794 INFO L226 Difference]: Without dead ends: 369 [2020-07-21 14:18:59,795 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 858 GetRequests, 727 SyntacticMatches, 84 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2057 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=1043, Invalid=1309, Unknown=0, NotChecked=0, Total=2352 [2020-07-21 14:18:59,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2020-07-21 14:18:59,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 364. [2020-07-21 14:18:59,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 364 states. [2020-07-21 14:18:59,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 388 transitions. [2020-07-21 14:18:59,809 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 388 transitions. Word has length 429 [2020-07-21 14:18:59,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:18:59,809 INFO L479 AbstractCegarLoop]: Abstraction has 364 states and 388 transitions. [2020-07-21 14:18:59,810 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-21 14:18:59,810 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 388 transitions. [2020-07-21 14:18:59,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 446 [2020-07-21 14:18:59,812 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:18:59,812 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 44, 43, 43, 43, 43, 43, 43, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:19:00,013 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:19:00,013 INFO L427 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:19:00,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:19:00,014 INFO L82 PathProgramCache]: Analyzing trace with hash -99716244, now seen corresponding path program 63 times [2020-07-21 14:19:00,015 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:19:00,015 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1637744203] [2020-07-21 14:19:00,015 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:19:00,189 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:19:00,189 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:19:00,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 1194 conjuncts, 88 conjunts are in the unsatisfiable core [2020-07-21 14:19:00,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:19:06,549 INFO L134 CoverageAnalysis]: Checked inductivity of 9202 backedges. 3948 proven. 1806 refuted. 0 times theorem prover too weak. 3448 trivial. 0 not checked. [2020-07-21 14:19:06,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:19:14,158 INFO L134 CoverageAnalysis]: Checked inductivity of 9202 backedges. 3782 proven. 1806 refuted. 0 times theorem prover too weak. 3614 trivial. 0 not checked. [2020-07-21 14:19:14,158 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1637744203] [2020-07-21 14:19:14,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:19:14,159 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88] total 131 [2020-07-21 14:19:14,159 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1078643179] [2020-07-21 14:19:14,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 131 states [2020-07-21 14:19:14,160 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:19:14,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2020-07-21 14:19:14,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3914, Invalid=13116, Unknown=0, NotChecked=0, Total=17030 [2020-07-21 14:19:14,162 INFO L87 Difference]: Start difference. First operand 364 states and 388 transitions. Second operand 131 states. [2020-07-21 14:19:22,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:19:22,454 INFO L93 Difference]: Finished difference Result 723 states and 876 transitions. [2020-07-21 14:19:22,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2020-07-21 14:19:22,454 INFO L78 Accepts]: Start accepts. Automaton has 131 states. Word has length 445 [2020-07-21 14:19:22,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:19:22,456 INFO L225 Difference]: With dead ends: 723 [2020-07-21 14:19:22,456 INFO L226 Difference]: Without dead ends: 538 [2020-07-21 14:19:22,458 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 932 GetRequests, 717 SyntacticMatches, 43 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8085 ImplicationChecksByTransitivity, 16.9s TimeCoverageRelationStatistics Valid=7741, Invalid=22361, Unknown=0, NotChecked=0, Total=30102 [2020-07-21 14:19:22,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 538 states. [2020-07-21 14:19:22,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 538 to 366. [2020-07-21 14:19:22,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 366 states. [2020-07-21 14:19:22,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 366 states to 366 states and 390 transitions. [2020-07-21 14:19:22,473 INFO L78 Accepts]: Start accepts. Automaton has 366 states and 390 transitions. Word has length 445 [2020-07-21 14:19:22,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:19:22,473 INFO L479 AbstractCegarLoop]: Abstraction has 366 states and 390 transitions. [2020-07-21 14:19:22,473 INFO L480 AbstractCegarLoop]: Interpolant automaton has 131 states. [2020-07-21 14:19:22,473 INFO L276 IsEmpty]: Start isEmpty. Operand 366 states and 390 transitions. [2020-07-21 14:19:22,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 448 [2020-07-21 14:19:22,476 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:19:22,476 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 44, 44, 43, 43, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:19:22,676 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:19:22,677 INFO L427 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:19:22,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:19:22,678 INFO L82 PathProgramCache]: Analyzing trace with hash 592048017, now seen corresponding path program 64 times [2020-07-21 14:19:22,678 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:19:22,678 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [885982587] [2020-07-21 14:19:22,679 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:19:22,859 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:19:22,859 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:19:22,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 1204 conjuncts, 90 conjunts are in the unsatisfiable core [2020-07-21 14:19:22,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:19:30,116 INFO L134 CoverageAnalysis]: Checked inductivity of 9288 backedges. 3784 proven. 1892 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 14:19:30,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:19:39,031 INFO L134 CoverageAnalysis]: Checked inductivity of 9288 backedges. 3784 proven. 1892 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 14:19:39,032 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [885982587] [2020-07-21 14:19:39,032 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:19:39,032 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 90] total 134 [2020-07-21 14:19:39,033 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [920087882] [2020-07-21 14:19:39,034 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2020-07-21 14:19:39,034 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:19:39,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2020-07-21 14:19:39,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4093, Invalid=13729, Unknown=0, NotChecked=0, Total=17822 [2020-07-21 14:19:39,036 INFO L87 Difference]: Start difference. First operand 366 states and 390 transitions. Second operand 134 states. [2020-07-21 14:19:48,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:19:48,969 INFO L93 Difference]: Finished difference Result 727 states and 883 transitions. [2020-07-21 14:19:48,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2020-07-21 14:19:48,969 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 447 [2020-07-21 14:19:48,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:19:48,971 INFO L225 Difference]: With dead ends: 727 [2020-07-21 14:19:48,971 INFO L226 Difference]: Without dead ends: 544 [2020-07-21 14:19:48,973 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 937 GetRequests, 717 SyntacticMatches, 44 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8471 ImplicationChecksByTransitivity, 19.5s TimeCoverageRelationStatistics Valid=8097, Invalid=23409, Unknown=0, NotChecked=0, Total=31506 [2020-07-21 14:19:48,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 544 states. [2020-07-21 14:19:48,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 544 to 368. [2020-07-21 14:19:48,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2020-07-21 14:19:48,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 392 transitions. [2020-07-21 14:19:48,987 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 392 transitions. Word has length 447 [2020-07-21 14:19:48,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:19:48,987 INFO L479 AbstractCegarLoop]: Abstraction has 368 states and 392 transitions. [2020-07-21 14:19:48,987 INFO L480 AbstractCegarLoop]: Interpolant automaton has 134 states. [2020-07-21 14:19:48,987 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 392 transitions. [2020-07-21 14:19:48,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 450 [2020-07-21 14:19:48,989 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:19:48,990 INFO L422 BasicCegarLoop]: trace histogram [45, 44, 44, 44, 44, 43, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:19:49,190 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:19:49,191 INFO L427 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:19:49,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:19:49,192 INFO L82 PathProgramCache]: Analyzing trace with hash -342428042, now seen corresponding path program 65 times [2020-07-21 14:19:49,192 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:19:49,192 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1890629331] [2020-07-21 14:19:49,192 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:19:49,370 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:19:49,370 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:19:49,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 1214 conjuncts, 91 conjunts are in the unsatisfiable core [2020-07-21 14:19:49,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:19:51,929 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:19:52,164 INFO L134 CoverageAnalysis]: Checked inductivity of 9376 backedges. 2066 proven. 3698 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 14:19:52,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:19:52,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:19:57,145 INFO L134 CoverageAnalysis]: Checked inductivity of 9376 backedges. 2066 proven. 3698 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 14:19:57,146 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1890629331] [2020-07-21 14:19:57,146 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:19:57,146 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 50 [2020-07-21 14:19:57,146 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276964164] [2020-07-21 14:19:57,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-21 14:19:57,147 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:19:57,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-21 14:19:57,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1132, Invalid=1318, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 14:19:57,147 INFO L87 Difference]: Start difference. First operand 368 states and 392 transitions. Second operand 50 states. [2020-07-21 14:19:58,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:19:58,298 INFO L93 Difference]: Finished difference Result 387 states and 413 transitions. [2020-07-21 14:19:58,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-21 14:19:58,299 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 449 [2020-07-21 14:19:58,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:19:58,302 INFO L225 Difference]: With dead ends: 387 [2020-07-21 14:19:58,302 INFO L226 Difference]: Without dead ends: 385 [2020-07-21 14:19:58,302 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 898 GetRequests, 761 SyntacticMatches, 88 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2243 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=1136, Invalid=1414, Unknown=0, NotChecked=0, Total=2550 [2020-07-21 14:19:58,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2020-07-21 14:19:58,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 380. [2020-07-21 14:19:58,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 380 states. [2020-07-21 14:19:58,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 380 states to 380 states and 405 transitions. [2020-07-21 14:19:58,323 INFO L78 Accepts]: Start accepts. Automaton has 380 states and 405 transitions. Word has length 449 [2020-07-21 14:19:58,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:19:58,323 INFO L479 AbstractCegarLoop]: Abstraction has 380 states and 405 transitions. [2020-07-21 14:19:58,323 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-21 14:19:58,323 INFO L276 IsEmpty]: Start isEmpty. Operand 380 states and 405 transitions. [2020-07-21 14:19:58,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 466 [2020-07-21 14:19:58,326 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:19:58,326 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 46, 45, 45, 45, 45, 45, 45, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:19:58,527 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:19:58,527 INFO L427 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:19:58,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:19:58,528 INFO L82 PathProgramCache]: Analyzing trace with hash -753505192, now seen corresponding path program 66 times [2020-07-21 14:19:58,529 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:19:58,529 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [113210162] [2020-07-21 14:19:58,529 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:19:58,704 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:19:58,704 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:19:58,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 1248 conjuncts, 92 conjunts are in the unsatisfiable core [2020-07-21 14:19:58,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:20:07,101 INFO L134 CoverageAnalysis]: Checked inductivity of 10080 backedges. 4312 proven. 1980 refuted. 0 times theorem prover too weak. 3788 trivial. 0 not checked. [2020-07-21 14:20:07,101 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:20:17,480 INFO L134 CoverageAnalysis]: Checked inductivity of 10080 backedges. 4138 proven. 1980 refuted. 0 times theorem prover too weak. 3962 trivial. 0 not checked. [2020-07-21 14:20:17,481 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [113210162] [2020-07-21 14:20:17,481 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:20:17,481 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92] total 137 [2020-07-21 14:20:17,481 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206656566] [2020-07-21 14:20:17,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 137 states [2020-07-21 14:20:17,482 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:20:17,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2020-07-21 14:20:17,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4276, Invalid=14356, Unknown=0, NotChecked=0, Total=18632 [2020-07-21 14:20:17,484 INFO L87 Difference]: Start difference. First operand 380 states and 405 transitions. Second operand 137 states. [2020-07-21 14:20:27,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:20:27,826 INFO L93 Difference]: Finished difference Result 755 states and 915 transitions. [2020-07-21 14:20:27,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2020-07-21 14:20:27,826 INFO L78 Accepts]: Start accepts. Automaton has 137 states. Word has length 465 [2020-07-21 14:20:27,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:20:27,828 INFO L225 Difference]: With dead ends: 755 [2020-07-21 14:20:27,828 INFO L226 Difference]: Without dead ends: 562 [2020-07-21 14:20:27,831 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 974 GetRequests, 749 SyntacticMatches, 45 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8866 ImplicationChecksByTransitivity, 22.4s TimeCoverageRelationStatistics Valid=8461, Invalid=24481, Unknown=0, NotChecked=0, Total=32942 [2020-07-21 14:20:27,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 562 states. [2020-07-21 14:20:27,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 562 to 382. [2020-07-21 14:20:27,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 382 states. [2020-07-21 14:20:27,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 407 transitions. [2020-07-21 14:20:27,846 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 407 transitions. Word has length 465 [2020-07-21 14:20:27,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:20:27,846 INFO L479 AbstractCegarLoop]: Abstraction has 382 states and 407 transitions. [2020-07-21 14:20:27,847 INFO L480 AbstractCegarLoop]: Interpolant automaton has 137 states. [2020-07-21 14:20:27,847 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 407 transitions. [2020-07-21 14:20:27,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-07-21 14:20:27,850 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:20:27,850 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 46, 46, 45, 45, 45, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:20:28,064 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:20:28,065 INFO L427 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:20:28,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:20:28,066 INFO L82 PathProgramCache]: Analyzing trace with hash -103324675, now seen corresponding path program 67 times [2020-07-21 14:20:28,066 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:20:28,067 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [185580727] [2020-07-21 14:20:28,067 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:20:28,245 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:20:28,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:20:28,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 1258 conjuncts, 94 conjunts are in the unsatisfiable core [2020-07-21 14:20:28,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:20:37,516 INFO L134 CoverageAnalysis]: Checked inductivity of 10170 backedges. 4140 proven. 2070 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 14:20:37,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:20:48,672 INFO L134 CoverageAnalysis]: Checked inductivity of 10170 backedges. 4140 proven. 2070 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 14:20:48,673 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [185580727] [2020-07-21 14:20:48,673 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:20:48,673 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [94, 94] total 140 [2020-07-21 14:20:48,673 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [419653102] [2020-07-21 14:20:48,674 INFO L459 AbstractCegarLoop]: Interpolant automaton has 140 states [2020-07-21 14:20:48,674 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:20:48,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2020-07-21 14:20:48,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4463, Invalid=14997, Unknown=0, NotChecked=0, Total=19460 [2020-07-21 14:20:48,676 INFO L87 Difference]: Start difference. First operand 382 states and 407 transitions. Second operand 140 states. [2020-07-21 14:21:01,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:21:01,189 INFO L93 Difference]: Finished difference Result 759 states and 922 transitions. [2020-07-21 14:21:01,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2020-07-21 14:21:01,189 INFO L78 Accepts]: Start accepts. Automaton has 140 states. Word has length 467 [2020-07-21 14:21:01,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:21:01,192 INFO L225 Difference]: With dead ends: 759 [2020-07-21 14:21:01,192 INFO L226 Difference]: Without dead ends: 568 [2020-07-21 14:21:01,195 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 979 GetRequests, 749 SyntacticMatches, 46 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9270 ImplicationChecksByTransitivity, 25.0s TimeCoverageRelationStatistics Valid=8833, Invalid=25577, Unknown=0, NotChecked=0, Total=34410 [2020-07-21 14:21:01,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 568 states. [2020-07-21 14:21:01,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 568 to 384. [2020-07-21 14:21:01,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 384 states. [2020-07-21 14:21:01,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 384 states to 384 states and 409 transitions. [2020-07-21 14:21:01,211 INFO L78 Accepts]: Start accepts. Automaton has 384 states and 409 transitions. Word has length 467 [2020-07-21 14:21:01,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:21:01,211 INFO L479 AbstractCegarLoop]: Abstraction has 384 states and 409 transitions. [2020-07-21 14:21:01,211 INFO L480 AbstractCegarLoop]: Interpolant automaton has 140 states. [2020-07-21 14:21:01,211 INFO L276 IsEmpty]: Start isEmpty. Operand 384 states and 409 transitions. [2020-07-21 14:21:01,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 470 [2020-07-21 14:21:01,213 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:21:01,213 INFO L422 BasicCegarLoop]: trace histogram [47, 46, 46, 46, 46, 45, 45, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:21:01,414 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:21:01,415 INFO L427 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:21:01,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:21:01,416 INFO L82 PathProgramCache]: Analyzing trace with hash 1949894242, now seen corresponding path program 68 times [2020-07-21 14:21:01,416 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:21:01,416 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1273449840] [2020-07-21 14:21:01,417 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:21:01,593 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:21:01,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:21:01,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 1268 conjuncts, 95 conjunts are in the unsatisfiable core [2020-07-21 14:21:01,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:21:04,961 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:21:05,227 INFO L134 CoverageAnalysis]: Checked inductivity of 10262 backedges. 2252 proven. 4050 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 14:21:05,227 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:21:05,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:21:12,047 INFO L134 CoverageAnalysis]: Checked inductivity of 10262 backedges. 2252 proven. 4050 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 14:21:12,047 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1273449840] [2020-07-21 14:21:12,047 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:21:12,048 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51] total 52 [2020-07-21 14:21:12,048 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348105691] [2020-07-21 14:21:12,048 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-07-21 14:21:12,048 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:21:12,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-07-21 14:21:12,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1229, Invalid=1423, Unknown=0, NotChecked=0, Total=2652 [2020-07-21 14:21:12,049 INFO L87 Difference]: Start difference. First operand 384 states and 409 transitions. Second operand 52 states. [2020-07-21 14:21:13,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:21:13,555 INFO L93 Difference]: Finished difference Result 403 states and 430 transitions. [2020-07-21 14:21:13,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-21 14:21:13,558 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 469 [2020-07-21 14:21:13,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:21:13,561 INFO L225 Difference]: With dead ends: 403 [2020-07-21 14:21:13,561 INFO L226 Difference]: Without dead ends: 401 [2020-07-21 14:21:13,562 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 938 GetRequests, 795 SyntacticMatches, 92 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2437 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=1233, Invalid=1523, Unknown=0, NotChecked=0, Total=2756 [2020-07-21 14:21:13,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2020-07-21 14:21:13,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 396. [2020-07-21 14:21:13,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 396 states. [2020-07-21 14:21:13,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 422 transitions. [2020-07-21 14:21:13,578 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 422 transitions. Word has length 469 [2020-07-21 14:21:13,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:21:13,578 INFO L479 AbstractCegarLoop]: Abstraction has 396 states and 422 transitions. [2020-07-21 14:21:13,578 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-07-21 14:21:13,579 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 422 transitions. [2020-07-21 14:21:13,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 486 [2020-07-21 14:21:13,581 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:21:13,581 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 48, 47, 47, 47, 47, 47, 47, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:21:13,782 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:21:13,782 INFO L427 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:21:13,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:21:13,784 INFO L82 PathProgramCache]: Analyzing trace with hash 676537412, now seen corresponding path program 69 times [2020-07-21 14:21:13,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:21:13,784 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1368510109] [2020-07-21 14:21:13,784 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:21:13,967 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:21:13,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:21:13,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 1302 conjuncts, 96 conjunts are in the unsatisfiable core [2020-07-21 14:21:13,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:21:24,514 INFO L134 CoverageAnalysis]: Checked inductivity of 10998 backedges. 4692 proven. 2162 refuted. 0 times theorem prover too weak. 4144 trivial. 0 not checked. [2020-07-21 14:21:24,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:21:37,382 INFO L134 CoverageAnalysis]: Checked inductivity of 10998 backedges. 4510 proven. 2162 refuted. 0 times theorem prover too weak. 4326 trivial. 0 not checked. [2020-07-21 14:21:37,383 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1368510109] [2020-07-21 14:21:37,383 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:21:37,383 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96] total 143 [2020-07-21 14:21:37,383 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308362543] [2020-07-21 14:21:37,384 INFO L459 AbstractCegarLoop]: Interpolant automaton has 143 states [2020-07-21 14:21:37,384 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:21:37,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2020-07-21 14:21:37,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4654, Invalid=15652, Unknown=0, NotChecked=0, Total=20306 [2020-07-21 14:21:37,387 INFO L87 Difference]: Start difference. First operand 396 states and 422 transitions. Second operand 143 states. [2020-07-21 14:21:51,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:21:51,542 INFO L93 Difference]: Finished difference Result 787 states and 954 transitions. [2020-07-21 14:21:51,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-21 14:21:51,543 INFO L78 Accepts]: Start accepts. Automaton has 143 states. Word has length 485 [2020-07-21 14:21:51,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:21:51,545 INFO L225 Difference]: With dead ends: 787 [2020-07-21 14:21:51,546 INFO L226 Difference]: Without dead ends: 586 [2020-07-21 14:21:51,549 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1016 GetRequests, 781 SyntacticMatches, 47 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9683 ImplicationChecksByTransitivity, 28.4s TimeCoverageRelationStatistics Valid=9213, Invalid=26697, Unknown=0, NotChecked=0, Total=35910 [2020-07-21 14:21:51,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2020-07-21 14:21:51,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 398. [2020-07-21 14:21:51,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 398 states. [2020-07-21 14:21:51,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 398 states to 398 states and 424 transitions. [2020-07-21 14:21:51,565 INFO L78 Accepts]: Start accepts. Automaton has 398 states and 424 transitions. Word has length 485 [2020-07-21 14:21:51,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:21:51,565 INFO L479 AbstractCegarLoop]: Abstraction has 398 states and 424 transitions. [2020-07-21 14:21:51,566 INFO L480 AbstractCegarLoop]: Interpolant automaton has 143 states. [2020-07-21 14:21:51,566 INFO L276 IsEmpty]: Start isEmpty. Operand 398 states and 424 transitions. [2020-07-21 14:21:51,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-21 14:21:51,568 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:21:51,569 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 48, 48, 47, 47, 47, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:21:51,769 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:21:51,770 INFO L427 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:21:51,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:21:51,771 INFO L82 PathProgramCache]: Analyzing trace with hash 579393385, now seen corresponding path program 70 times [2020-07-21 14:21:51,771 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:21:51,772 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2073952388] [2020-07-21 14:21:51,772 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:21:51,961 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:21:51,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:21:51,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 1312 conjuncts, 98 conjunts are in the unsatisfiable core [2020-07-21 14:21:51,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:22:03,812 INFO L134 CoverageAnalysis]: Checked inductivity of 11092 backedges. 4512 proven. 2256 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 14:22:03,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:22:17,861 INFO L134 CoverageAnalysis]: Checked inductivity of 11092 backedges. 4512 proven. 2256 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 14:22:17,862 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2073952388] [2020-07-21 14:22:17,862 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:22:17,862 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98] total 146 [2020-07-21 14:22:17,862 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669847915] [2020-07-21 14:22:17,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 146 states [2020-07-21 14:22:17,863 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:22:17,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2020-07-21 14:22:17,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4849, Invalid=16321, Unknown=0, NotChecked=0, Total=21170 [2020-07-21 14:22:17,865 INFO L87 Difference]: Start difference. First operand 398 states and 424 transitions. Second operand 146 states. [2020-07-21 14:22:34,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:22:34,240 INFO L93 Difference]: Finished difference Result 791 states and 961 transitions. [2020-07-21 14:22:34,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2020-07-21 14:22:34,240 INFO L78 Accepts]: Start accepts. Automaton has 146 states. Word has length 487 [2020-07-21 14:22:34,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:22:34,243 INFO L225 Difference]: With dead ends: 791 [2020-07-21 14:22:34,243 INFO L226 Difference]: Without dead ends: 592 [2020-07-21 14:22:34,245 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 781 SyntacticMatches, 48 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10105 ImplicationChecksByTransitivity, 31.5s TimeCoverageRelationStatistics Valid=9601, Invalid=27841, Unknown=0, NotChecked=0, Total=37442 [2020-07-21 14:22:34,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2020-07-21 14:22:34,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 400. [2020-07-21 14:22:34,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 400 states. [2020-07-21 14:22:34,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 426 transitions. [2020-07-21 14:22:34,272 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 426 transitions. Word has length 487 [2020-07-21 14:22:34,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:22:34,273 INFO L479 AbstractCegarLoop]: Abstraction has 400 states and 426 transitions. [2020-07-21 14:22:34,273 INFO L480 AbstractCegarLoop]: Interpolant automaton has 146 states. [2020-07-21 14:22:34,273 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 426 transitions. [2020-07-21 14:22:34,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-21 14:22:34,277 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:22:34,277 INFO L422 BasicCegarLoop]: trace histogram [49, 48, 48, 48, 48, 47, 47, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:22:34,490 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:22:34,491 INFO L427 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:22:34,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:22:34,492 INFO L82 PathProgramCache]: Analyzing trace with hash 1713263950, now seen corresponding path program 71 times [2020-07-21 14:22:34,492 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:22:34,492 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [434989172] [2020-07-21 14:22:34,492 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:22:34,782 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:22:34,783 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:22:34,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 1322 conjuncts, 99 conjunts are in the unsatisfiable core [2020-07-21 14:22:34,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:22:39,370 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:22:39,700 INFO L134 CoverageAnalysis]: Checked inductivity of 11188 backedges. 2446 proven. 4418 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 14:22:39,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:22:39,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:22:48,419 INFO L134 CoverageAnalysis]: Checked inductivity of 11188 backedges. 2446 proven. 4418 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 14:22:48,419 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [434989172] [2020-07-21 14:22:48,420 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:22:48,420 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53] total 54 [2020-07-21 14:22:48,420 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966584461] [2020-07-21 14:22:48,421 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-07-21 14:22:48,421 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:22:48,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-07-21 14:22:48,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1330, Invalid=1532, Unknown=0, NotChecked=0, Total=2862 [2020-07-21 14:22:48,421 INFO L87 Difference]: Start difference. First operand 400 states and 426 transitions. Second operand 54 states. [2020-07-21 14:22:50,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:22:50,379 INFO L93 Difference]: Finished difference Result 419 states and 447 transitions. [2020-07-21 14:22:50,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-21 14:22:50,383 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 489 [2020-07-21 14:22:50,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:22:50,386 INFO L225 Difference]: With dead ends: 419 [2020-07-21 14:22:50,386 INFO L226 Difference]: Without dead ends: 417 [2020-07-21 14:22:50,387 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 978 GetRequests, 829 SyntacticMatches, 96 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2639 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=1334, Invalid=1636, Unknown=0, NotChecked=0, Total=2970 [2020-07-21 14:22:50,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2020-07-21 14:22:50,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 412. [2020-07-21 14:22:50,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 412 states. [2020-07-21 14:22:50,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 412 states to 412 states and 439 transitions. [2020-07-21 14:22:50,405 INFO L78 Accepts]: Start accepts. Automaton has 412 states and 439 transitions. Word has length 489 [2020-07-21 14:22:50,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:22:50,405 INFO L479 AbstractCegarLoop]: Abstraction has 412 states and 439 transitions. [2020-07-21 14:22:50,405 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-07-21 14:22:50,405 INFO L276 IsEmpty]: Start isEmpty. Operand 412 states and 439 transitions. [2020-07-21 14:22:50,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2020-07-21 14:22:50,408 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:22:50,409 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 49, 49, 49, 49, 49, 49, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:22:50,609 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:22:50,610 INFO L427 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:22:50,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:22:50,611 INFO L82 PathProgramCache]: Analyzing trace with hash -831186128, now seen corresponding path program 72 times [2020-07-21 14:22:50,611 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:22:50,611 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [888702277] [2020-07-21 14:22:50,612 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:22:50,809 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:22:50,809 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:22:50,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 1356 conjuncts, 100 conjunts are in the unsatisfiable core [2020-07-21 14:22:50,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:23:04,015 INFO L134 CoverageAnalysis]: Checked inductivity of 11956 backedges. 5088 proven. 2352 refuted. 0 times theorem prover too weak. 4516 trivial. 0 not checked. [2020-07-21 14:23:04,016 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:23:20,356 INFO L134 CoverageAnalysis]: Checked inductivity of 11956 backedges. 4898 proven. 2352 refuted. 0 times theorem prover too weak. 4706 trivial. 0 not checked. [2020-07-21 14:23:20,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [888702277] [2020-07-21 14:23:20,357 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:23:20,357 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 100] total 149 [2020-07-21 14:23:20,357 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913801143] [2020-07-21 14:23:20,358 INFO L459 AbstractCegarLoop]: Interpolant automaton has 149 states [2020-07-21 14:23:20,358 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:23:20,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 149 interpolants. [2020-07-21 14:23:20,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5048, Invalid=17004, Unknown=0, NotChecked=0, Total=22052 [2020-07-21 14:23:20,360 INFO L87 Difference]: Start difference. First operand 412 states and 439 transitions. Second operand 149 states. [2020-07-21 14:23:38,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:23:38,348 INFO L93 Difference]: Finished difference Result 819 states and 993 transitions. [2020-07-21 14:23:38,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2020-07-21 14:23:38,349 INFO L78 Accepts]: Start accepts. Automaton has 149 states. Word has length 505 [2020-07-21 14:23:38,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:23:38,352 INFO L225 Difference]: With dead ends: 819 [2020-07-21 14:23:38,352 INFO L226 Difference]: Without dead ends: 610 [2020-07-21 14:23:38,357 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1058 GetRequests, 813 SyntacticMatches, 49 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10536 ImplicationChecksByTransitivity, 36.0s TimeCoverageRelationStatistics Valid=9997, Invalid=29009, Unknown=0, NotChecked=0, Total=39006 [2020-07-21 14:23:38,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2020-07-21 14:23:38,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 414. [2020-07-21 14:23:38,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 414 states. [2020-07-21 14:23:38,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 441 transitions. [2020-07-21 14:23:38,374 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 441 transitions. Word has length 505 [2020-07-21 14:23:38,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:23:38,375 INFO L479 AbstractCegarLoop]: Abstraction has 414 states and 441 transitions. [2020-07-21 14:23:38,375 INFO L480 AbstractCegarLoop]: Interpolant automaton has 149 states. [2020-07-21 14:23:38,375 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 441 transitions. [2020-07-21 14:23:38,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-21 14:23:38,378 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:23:38,378 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 50, 49, 49, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:23:38,579 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:23:38,579 INFO L427 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:23:38,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:23:38,580 INFO L82 PathProgramCache]: Analyzing trace with hash 1643039189, now seen corresponding path program 73 times [2020-07-21 14:23:38,581 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:23:38,581 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1846696565] [2020-07-21 14:23:38,581 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:23:38,800 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:23:38,800 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:23:38,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 1366 conjuncts, 102 conjunts are in the unsatisfiable core [2020-07-21 14:23:38,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:23:53,994 INFO L134 CoverageAnalysis]: Checked inductivity of 12054 backedges. 4900 proven. 2450 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-21 14:23:53,994 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:24:12,111 INFO L134 CoverageAnalysis]: Checked inductivity of 12054 backedges. 4900 proven. 2450 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-21 14:24:12,112 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1846696565] [2020-07-21 14:24:12,112 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:24:12,113 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 102] total 152 [2020-07-21 14:24:12,113 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [893555869] [2020-07-21 14:24:12,113 INFO L459 AbstractCegarLoop]: Interpolant automaton has 152 states [2020-07-21 14:24:12,114 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:24:12,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2020-07-21 14:24:12,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5251, Invalid=17701, Unknown=0, NotChecked=0, Total=22952 [2020-07-21 14:24:12,116 INFO L87 Difference]: Start difference. First operand 414 states and 441 transitions. Second operand 152 states. [2020-07-21 14:24:33,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:24:33,311 INFO L93 Difference]: Finished difference Result 823 states and 1000 transitions. [2020-07-21 14:24:33,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2020-07-21 14:24:33,311 INFO L78 Accepts]: Start accepts. Automaton has 152 states. Word has length 507 [2020-07-21 14:24:33,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:24:33,314 INFO L225 Difference]: With dead ends: 823 [2020-07-21 14:24:33,314 INFO L226 Difference]: Without dead ends: 616 [2020-07-21 14:24:33,317 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1063 GetRequests, 813 SyntacticMatches, 50 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10976 ImplicationChecksByTransitivity, 40.6s TimeCoverageRelationStatistics Valid=10401, Invalid=30201, Unknown=0, NotChecked=0, Total=40602 [2020-07-21 14:24:33,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 616 states. [2020-07-21 14:24:33,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 616 to 416. [2020-07-21 14:24:33,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 416 states. [2020-07-21 14:24:33,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 416 states to 416 states and 443 transitions. [2020-07-21 14:24:33,334 INFO L78 Accepts]: Start accepts. Automaton has 416 states and 443 transitions. Word has length 507 [2020-07-21 14:24:33,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:24:33,334 INFO L479 AbstractCegarLoop]: Abstraction has 416 states and 443 transitions. [2020-07-21 14:24:33,334 INFO L480 AbstractCegarLoop]: Interpolant automaton has 152 states. [2020-07-21 14:24:33,335 INFO L276 IsEmpty]: Start isEmpty. Operand 416 states and 443 transitions. [2020-07-21 14:24:33,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 510 [2020-07-21 14:24:33,337 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:24:33,338 INFO L422 BasicCegarLoop]: trace histogram [51, 50, 50, 50, 50, 49, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:24:33,538 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:24:33,539 INFO L427 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:24:33,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:24:33,540 INFO L82 PathProgramCache]: Analyzing trace with hash -38313158, now seen corresponding path program 74 times [2020-07-21 14:24:33,540 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:24:33,541 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1407803953] [2020-07-21 14:24:33,541 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:24:33,748 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:24:33,748 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:24:33,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 1376 conjuncts, 103 conjunts are in the unsatisfiable core [2020-07-21 14:24:33,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:24:39,159 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:24:39,514 INFO L134 CoverageAnalysis]: Checked inductivity of 12154 backedges. 2648 proven. 4802 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-21 14:24:39,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:24:39,730 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:24:50,801 INFO L134 CoverageAnalysis]: Checked inductivity of 12154 backedges. 2648 proven. 4802 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-21 14:24:50,801 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1407803953] [2020-07-21 14:24:50,802 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:24:50,802 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55] total 56 [2020-07-21 14:24:50,802 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [680573562] [2020-07-21 14:24:50,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-07-21 14:24:50,803 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:24:50,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-07-21 14:24:50,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1435, Invalid=1645, Unknown=0, NotChecked=0, Total=3080 [2020-07-21 14:24:50,804 INFO L87 Difference]: Start difference. First operand 416 states and 443 transitions. Second operand 56 states. [2020-07-21 14:24:53,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:24:53,303 INFO L93 Difference]: Finished difference Result 435 states and 464 transitions. [2020-07-21 14:24:53,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-07-21 14:24:53,308 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 509 [2020-07-21 14:24:53,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:24:53,312 INFO L225 Difference]: With dead ends: 435 [2020-07-21 14:24:53,312 INFO L226 Difference]: Without dead ends: 433 [2020-07-21 14:24:53,313 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1018 GetRequests, 863 SyntacticMatches, 100 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2849 ImplicationChecksByTransitivity, 15.7s TimeCoverageRelationStatistics Valid=1439, Invalid=1753, Unknown=0, NotChecked=0, Total=3192 [2020-07-21 14:24:53,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 433 states. [2020-07-21 14:24:53,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 433 to 428. [2020-07-21 14:24:53,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 428 states. [2020-07-21 14:24:53,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 428 states to 428 states and 456 transitions. [2020-07-21 14:24:53,341 INFO L78 Accepts]: Start accepts. Automaton has 428 states and 456 transitions. Word has length 509 [2020-07-21 14:24:53,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:24:53,341 INFO L479 AbstractCegarLoop]: Abstraction has 428 states and 456 transitions. [2020-07-21 14:24:53,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-07-21 14:24:53,342 INFO L276 IsEmpty]: Start isEmpty. Operand 428 states and 456 transitions. [2020-07-21 14:24:53,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 526 [2020-07-21 14:24:53,345 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:24:53,345 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 52, 51, 51, 51, 51, 51, 51, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:24:53,546 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:24:53,546 INFO L427 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:24:53,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:24:53,547 INFO L82 PathProgramCache]: Analyzing trace with hash 283955484, now seen corresponding path program 75 times [2020-07-21 14:24:53,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:24:53,548 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1808333062] [2020-07-21 14:24:53,548 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:24:53,751 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:24:53,751 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:24:53,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 1410 conjuncts, 104 conjunts are in the unsatisfiable core [2020-07-21 14:24:53,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:25:11,393 INFO L134 CoverageAnalysis]: Checked inductivity of 12954 backedges. 5500 proven. 2550 refuted. 0 times theorem prover too weak. 4904 trivial. 0 not checked. [2020-07-21 14:25:11,394 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:25:32,198 INFO L134 CoverageAnalysis]: Checked inductivity of 12954 backedges. 5302 proven. 2550 refuted. 0 times theorem prover too weak. 5102 trivial. 0 not checked. [2020-07-21 14:25:32,199 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1808333062] [2020-07-21 14:25:32,199 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:25:32,199 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [104, 104] total 155 [2020-07-21 14:25:32,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761038288] [2020-07-21 14:25:32,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 155 states [2020-07-21 14:25:32,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:25:32,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2020-07-21 14:25:32,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5458, Invalid=18412, Unknown=0, NotChecked=0, Total=23870 [2020-07-21 14:25:32,202 INFO L87 Difference]: Start difference. First operand 428 states and 456 transitions. Second operand 155 states. [2020-07-21 14:25:55,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:25:55,678 INFO L93 Difference]: Finished difference Result 851 states and 1032 transitions. [2020-07-21 14:25:55,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2020-07-21 14:25:55,678 INFO L78 Accepts]: Start accepts. Automaton has 155 states. Word has length 525 [2020-07-21 14:25:55,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:25:55,682 INFO L225 Difference]: With dead ends: 851 [2020-07-21 14:25:55,682 INFO L226 Difference]: Without dead ends: 634 [2020-07-21 14:25:55,687 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1100 GetRequests, 845 SyntacticMatches, 51 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11425 ImplicationChecksByTransitivity, 46.8s TimeCoverageRelationStatistics Valid=10813, Invalid=31417, Unknown=0, NotChecked=0, Total=42230 [2020-07-21 14:25:55,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 634 states. [2020-07-21 14:25:55,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 634 to 430. [2020-07-21 14:25:55,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 430 states. [2020-07-21 14:25:55,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 458 transitions. [2020-07-21 14:25:55,718 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 458 transitions. Word has length 525 [2020-07-21 14:25:55,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:25:55,719 INFO L479 AbstractCegarLoop]: Abstraction has 430 states and 458 transitions. [2020-07-21 14:25:55,719 INFO L480 AbstractCegarLoop]: Interpolant automaton has 155 states. [2020-07-21 14:25:55,719 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 458 transitions. [2020-07-21 14:25:55,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 528 [2020-07-21 14:25:55,723 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:25:55,724 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 52, 52, 51, 51, 51, 51, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:25:55,938 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:25:55,939 INFO L427 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:25:55,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:25:55,940 INFO L82 PathProgramCache]: Analyzing trace with hash 1129954113, now seen corresponding path program 76 times [2020-07-21 14:25:55,940 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:25:55,940 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [577908554] [2020-07-21 14:25:55,940 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:25:56,145 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:25:56,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:25:56,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 1420 conjuncts, 106 conjunts are in the unsatisfiable core [2020-07-21 14:25:56,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:26:15,177 INFO L134 CoverageAnalysis]: Checked inductivity of 13056 backedges. 5304 proven. 2652 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-21 14:26:15,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:26:38,334 INFO L134 CoverageAnalysis]: Checked inductivity of 13056 backedges. 5304 proven. 2652 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-21 14:26:38,335 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [577908554] [2020-07-21 14:26:38,335 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:26:38,335 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [106, 106] total 158 [2020-07-21 14:26:38,335 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713220919] [2020-07-21 14:26:38,336 INFO L459 AbstractCegarLoop]: Interpolant automaton has 158 states [2020-07-21 14:26:38,336 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:26:38,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2020-07-21 14:26:38,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5669, Invalid=19137, Unknown=0, NotChecked=0, Total=24806 [2020-07-21 14:26:38,338 INFO L87 Difference]: Start difference. First operand 430 states and 458 transitions. Second operand 158 states. [2020-07-21 14:27:04,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:27:04,615 INFO L93 Difference]: Finished difference Result 855 states and 1039 transitions. [2020-07-21 14:27:04,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2020-07-21 14:27:04,615 INFO L78 Accepts]: Start accepts. Automaton has 158 states. Word has length 527 [2020-07-21 14:27:04,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:27:04,619 INFO L225 Difference]: With dead ends: 855 [2020-07-21 14:27:04,619 INFO L226 Difference]: Without dead ends: 640 [2020-07-21 14:27:04,624 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1105 GetRequests, 845 SyntacticMatches, 52 SemanticMatches, 208 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11883 ImplicationChecksByTransitivity, 51.7s TimeCoverageRelationStatistics Valid=11233, Invalid=32657, Unknown=0, NotChecked=0, Total=43890 [2020-07-21 14:27:04,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 640 states. [2020-07-21 14:27:04,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 640 to 432. [2020-07-21 14:27:04,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 432 states. [2020-07-21 14:27:04,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 432 states to 432 states and 460 transitions. [2020-07-21 14:27:04,656 INFO L78 Accepts]: Start accepts. Automaton has 432 states and 460 transitions. Word has length 527 [2020-07-21 14:27:04,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:27:04,656 INFO L479 AbstractCegarLoop]: Abstraction has 432 states and 460 transitions. [2020-07-21 14:27:04,656 INFO L480 AbstractCegarLoop]: Interpolant automaton has 158 states. [2020-07-21 14:27:04,656 INFO L276 IsEmpty]: Start isEmpty. Operand 432 states and 460 transitions. [2020-07-21 14:27:04,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 530 [2020-07-21 14:27:04,661 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:27:04,662 INFO L422 BasicCegarLoop]: trace histogram [53, 52, 52, 52, 52, 51, 51, 51, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:27:04,874 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:27:04,875 INFO L427 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:27:04,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:27:04,876 INFO L82 PathProgramCache]: Analyzing trace with hash -1909149658, now seen corresponding path program 77 times [2020-07-21 14:27:04,876 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:27:04,876 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [150417205] [2020-07-21 14:27:04,877 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 81 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:27:05,186 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:27:05,186 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:27:05,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 1430 conjuncts, 107 conjunts are in the unsatisfiable core [2020-07-21 14:27:05,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:27:12,037 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:27:12,449 INFO L134 CoverageAnalysis]: Checked inductivity of 13160 backedges. 2858 proven. 5202 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-21 14:27:12,450 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:27:12,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:27:26,418 INFO L134 CoverageAnalysis]: Checked inductivity of 13160 backedges. 2858 proven. 5202 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-21 14:27:26,419 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [150417205] [2020-07-21 14:27:26,419 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:27:26,419 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57] total 58 [2020-07-21 14:27:26,420 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952676010] [2020-07-21 14:27:26,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-07-21 14:27:26,420 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:27:26,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-07-21 14:27:26,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1544, Invalid=1762, Unknown=0, NotChecked=0, Total=3306 [2020-07-21 14:27:26,421 INFO L87 Difference]: Start difference. First operand 432 states and 460 transitions. Second operand 58 states. [2020-07-21 14:27:29,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:27:29,586 INFO L93 Difference]: Finished difference Result 451 states and 481 transitions. [2020-07-21 14:27:29,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-07-21 14:27:29,592 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 529 [2020-07-21 14:27:29,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:27:29,596 INFO L225 Difference]: With dead ends: 451 [2020-07-21 14:27:29,596 INFO L226 Difference]: Without dead ends: 449 [2020-07-21 14:27:29,596 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1058 GetRequests, 897 SyntacticMatches, 104 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3067 ImplicationChecksByTransitivity, 19.7s TimeCoverageRelationStatistics Valid=1548, Invalid=1874, Unknown=0, NotChecked=0, Total=3422 [2020-07-21 14:27:29,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 449 states. [2020-07-21 14:27:29,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 449 to 444. [2020-07-21 14:27:29,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 444 states. [2020-07-21 14:27:29,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 444 states to 444 states and 473 transitions. [2020-07-21 14:27:29,616 INFO L78 Accepts]: Start accepts. Automaton has 444 states and 473 transitions. Word has length 529 [2020-07-21 14:27:29,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:27:29,617 INFO L479 AbstractCegarLoop]: Abstraction has 444 states and 473 transitions. [2020-07-21 14:27:29,617 INFO L480 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-07-21 14:27:29,617 INFO L276 IsEmpty]: Start isEmpty. Operand 444 states and 473 transitions. [2020-07-21 14:27:29,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 546 [2020-07-21 14:27:29,621 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:27:29,621 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 54, 53, 53, 53, 53, 53, 53, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:27:29,822 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:27:29,823 INFO L427 AbstractCegarLoop]: === Iteration 81 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:27:29,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:27:29,824 INFO L82 PathProgramCache]: Analyzing trace with hash -773143032, now seen corresponding path program 78 times [2020-07-21 14:27:29,824 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:27:29,824 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2072246569] [2020-07-21 14:27:29,825 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 82 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:27:30,042 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:27:30,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:27:30,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 1464 conjuncts, 108 conjunts are in the unsatisfiable core [2020-07-21 14:27:30,055 INFO L286 TraceCheckSpWp]: Computing forward predicates...