/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 NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/MADWiFi-encode_ie_ok.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:49:30,203 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:49:30,205 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:49:30,217 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:49:30,217 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:49:30,218 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:49:30,220 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:49:30,221 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:49:30,223 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:49:30,224 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:49:30,225 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:49:30,226 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:49:30,226 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:49:30,227 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:49:30,228 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:49:30,229 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:49:30,230 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:49:30,231 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:49:30,232 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:49:30,234 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:49:30,236 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:49:30,237 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:49:30,238 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:49:30,239 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:49:30,241 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 11:49:30,249 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:49:30,249 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:49:30,250 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:49:30,251 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 11:49:30,266 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:49:30,266 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:49:30,267 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:49:30,267 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:49:30,267 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:49:30,268 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:49:30,268 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:49:30,268 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:49:30,268 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:49:30,268 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:49:30,269 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:49:30,269 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:49:30,269 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:49:30,269 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:49:30,269 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:49:30,270 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:49:30,270 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:49:30,270 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:49:30,270 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:49:30,270 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:49:30,271 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:49:30,271 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:49:30,271 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:49:30,271 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:49:30,271 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:49:30,272 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:49:30,272 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:30,272 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:49:30,272 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:49:30,272 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 -> NOT_INCREMENTALLY [2020-07-20 11:49:30,543 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:49:30,560 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:49:30,565 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:49:30,568 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:49:30,570 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:49:30,571 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/MADWiFi-encode_ie_ok.i [2020-07-20 11:49:30,642 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ac920efd5/386ee3a136ae40eb8411701cea41fb1e/FLAG0b74944a6 [2020-07-20 11:49:31,097 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:49:31,098 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/MADWiFi-encode_ie_ok.i [2020-07-20 11:49:31,104 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ac920efd5/386ee3a136ae40eb8411701cea41fb1e/FLAG0b74944a6 [2020-07-20 11:49:31,484 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ac920efd5/386ee3a136ae40eb8411701cea41fb1e [2020-07-20 11:49:31,492 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:49:31,495 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:49:31,496 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:49:31,497 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:49:31,502 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:49:31,504 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:49:31" (1/1) ... [2020-07-20 11:49:31,506 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@34800825 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:49:31, skipping insertion in model container [2020-07-20 11:49:31,507 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:49:31" (1/1) ... [2020-07-20 11:49:31,515 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:49:31,537 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:49:31,699 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:49:31,704 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:49:31,723 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:49:31,738 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:49:31,739 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:49:31 WrapperNode [2020-07-20 11:49:31,739 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:49:31,740 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:49:31,740 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:49:31,740 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:49:31,754 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:49:31" (1/1) ... [2020-07-20 11:49:31,754 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:49:31" (1/1) ... [2020-07-20 11:49:31,760 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:49:31" (1/1) ... [2020-07-20 11:49:31,761 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:49:31" (1/1) ... [2020-07-20 11:49:31,767 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:49:31" (1/1) ... [2020-07-20 11:49:31,777 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:49:31" (1/1) ... [2020-07-20 11:49:31,783 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:49:31" (1/1) ... [2020-07-20 11:49:31,787 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:49:31,791 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:49:31,791 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:49:31,791 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:49:31,796 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:49:31" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:49:31,932 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:49:31,932 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:49:31,932 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 11:49:31,932 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 11:49:31,932 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:49:31,932 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:49:31,933 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 11:49:31,933 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 11:49:31,933 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 11:49:31,933 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 11:49:31,933 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:49:31,933 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:49:31,933 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:49:32,167 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:49:32,168 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 11:49:32,172 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:49:32 BoogieIcfgContainer [2020-07-20 11:49:32,172 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:49:32,173 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:49:32,174 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:49:32,177 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:49:32,177 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:49:31" (1/3) ... [2020-07-20 11:49:32,178 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31faf4bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:49:32, skipping insertion in model container [2020-07-20 11:49:32,178 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:49:31" (2/3) ... [2020-07-20 11:49:32,179 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31faf4bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:49:32, skipping insertion in model container [2020-07-20 11:49:32,179 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:49:32" (3/3) ... [2020-07-20 11:49:32,181 INFO L109 eAbstractionObserver]: Analyzing ICFG MADWiFi-encode_ie_ok.i [2020-07-20 11:49:32,192 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:49:32,199 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:49:32,218 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:49:32,249 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:49:32,249 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:49:32,250 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:49:32,250 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:49:32,250 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:49:32,250 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:49:32,250 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:49:32,251 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:49:32,275 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-20 11:49:32,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 11:49:32,283 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:49:32,284 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:49:32,284 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:49:32,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:49:32,292 INFO L82 PathProgramCache]: Analyzing trace with hash 921445730, now seen corresponding path program 1 times [2020-07-20 11:49:32,301 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:49:32,302 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2018720426] [2020-07-20 11:49:32,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:32,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:49:32,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 11:49:32,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:49:32,438 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:49:32,473 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:49:32,474 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:49:32,475 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2018720426] [2020-07-20 11:49:32,476 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:49:32,476 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 11:49:32,477 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1162802028] [2020-07-20 11:49:32,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 11:49:32,482 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:49:32,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 11:49:32,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-20 11:49:32,495 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 6 states. [2020-07-20 11:49:32,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:49:32,627 INFO L93 Difference]: Finished difference Result 51 states and 67 transitions. [2020-07-20 11:49:32,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 11:49:32,629 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2020-07-20 11:49:32,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:49:32,638 INFO L225 Difference]: With dead ends: 51 [2020-07-20 11:49:32,639 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 11:49:32,643 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-20 11:49:32,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 11:49:32,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-20 11:49:32,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 11:49:32,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-07-20 11:49:32,686 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 18 [2020-07-20 11:49:32,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:49:32,686 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-07-20 11:49:32,686 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 11:49:32,687 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-07-20 11:49:32,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 11:49:32,688 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:49:32,688 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:49:32,900 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:32,901 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:49:32,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:49:32,902 INFO L82 PathProgramCache]: Analyzing trace with hash 487181509, now seen corresponding path program 1 times [2020-07-20 11:49:32,903 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:49:32,903 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [310446081] [2020-07-20 11:49:32,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:32,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:49:32,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 11:49:32,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:49:33,001 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:49:33,042 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:49:33,042 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:49:33,047 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [310446081] [2020-07-20 11:49:33,048 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:49:33,048 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 11:49:33,048 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307753338] [2020-07-20 11:49:33,051 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 11:49:33,051 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:49:33,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 11:49:33,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-20 11:49:33,052 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 6 states. [2020-07-20 11:49:33,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:49:33,133 INFO L93 Difference]: Finished difference Result 38 states and 39 transitions. [2020-07-20 11:49:33,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 11:49:33,134 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2020-07-20 11:49:33,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:49:33,136 INFO L225 Difference]: With dead ends: 38 [2020-07-20 11:49:33,137 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 11:49:33,138 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-20 11:49:33,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 11:49:33,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-07-20 11:49:33,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 11:49:33,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-07-20 11:49:33,151 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 23 [2020-07-20 11:49:33,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:49:33,151 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-07-20 11:49:33,152 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 11:49:33,152 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-07-20 11:49:33,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-07-20 11:49:33,154 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:49:33,154 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:49:33,367 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:33,368 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:49:33,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:49:33,369 INFO L82 PathProgramCache]: Analyzing trace with hash 258938125, now seen corresponding path program 1 times [2020-07-20 11:49:33,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:49:33,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [768663943] [2020-07-20 11:49:33,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:33,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:49:33,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 11:49:33,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:49:33,513 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:49:33,561 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 11:49:33,562 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:49:33,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:49:33,694 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [768663943] [2020-07-20 11:49:33,694 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:49:33,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-07-20 11:49:33,695 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071622995] [2020-07-20 11:49:33,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 11:49:33,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:49:33,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 11:49:33,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:49:33,696 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 9 states. [2020-07-20 11:49:33,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:49:33,847 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2020-07-20 11:49:33,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:49:33,848 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 36 [2020-07-20 11:49:33,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:49:33,849 INFO L225 Difference]: With dead ends: 47 [2020-07-20 11:49:33,849 INFO L226 Difference]: Without dead ends: 45 [2020-07-20 11:49:33,850 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2020-07-20 11:49:33,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-20 11:49:33,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2020-07-20 11:49:33,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-20 11:49:33,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-07-20 11:49:33,861 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 36 [2020-07-20 11:49:33,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:49:33,861 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-07-20 11:49:33,861 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 11:49:33,862 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-07-20 11:49:33,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-20 11:49:33,863 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:49:33,864 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:49:34,076 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:34,077 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:49:34,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:49:34,078 INFO L82 PathProgramCache]: Analyzing trace with hash -801144379, now seen corresponding path program 2 times [2020-07-20 11:49:34,079 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:49:34,079 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2115176546] [2020-07-20 11:49:34,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:34,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:49:34,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 11:49:34,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:49:34,217 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:49:34,259 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 10 proven. 11 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 11:49:34,260 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:49:34,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:49:34,373 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2115176546] [2020-07-20 11:49:34,373 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:49:34,373 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-07-20 11:49:34,374 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529036067] [2020-07-20 11:49:34,374 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 11:49:34,374 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:49:34,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 11:49:34,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:49:34,375 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 11 states. [2020-07-20 11:49:34,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:49:34,584 INFO L93 Difference]: Finished difference Result 56 states and 59 transitions. [2020-07-20 11:49:34,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:49:34,584 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2020-07-20 11:49:34,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:49:34,586 INFO L225 Difference]: With dead ends: 56 [2020-07-20 11:49:34,586 INFO L226 Difference]: Without dead ends: 54 [2020-07-20 11:49:34,587 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=83, Invalid=259, Unknown=0, NotChecked=0, Total=342 [2020-07-20 11:49:34,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-20 11:49:34,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-07-20 11:49:34,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-20 11:49:34,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-07-20 11:49:34,597 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 49 [2020-07-20 11:49:34,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:49:34,598 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-07-20 11:49:34,598 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 11:49:34,598 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-07-20 11:49:34,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-07-20 11:49:34,600 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:49:34,600 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:49:34,813 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:34,814 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:49:34,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:49:34,814 INFO L82 PathProgramCache]: Analyzing trace with hash -907575283, now seen corresponding path program 3 times [2020-07-20 11:49:34,815 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:49:34,815 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1628315577] [2020-07-20 11:49:34,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:34,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:49:34,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 11:49:34,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:49:35,004 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:49:35,058 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 14 proven. 24 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-20 11:49:35,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:49:35,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:49:35,177 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1628315577] [2020-07-20 11:49:35,177 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:49:35,178 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-07-20 11:49:35,178 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729083989] [2020-07-20 11:49:35,179 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 11:49:35,179 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:49:35,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 11:49:35,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2020-07-20 11:49:35,180 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 13 states. [2020-07-20 11:49:35,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:49:35,487 INFO L93 Difference]: Finished difference Result 65 states and 69 transitions. [2020-07-20 11:49:35,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 11:49:35,488 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 62 [2020-07-20 11:49:35,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:49:35,489 INFO L225 Difference]: With dead ends: 65 [2020-07-20 11:49:35,489 INFO L226 Difference]: Without dead ends: 63 [2020-07-20 11:49:35,490 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 57 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=102, Invalid=360, Unknown=0, NotChecked=0, Total=462 [2020-07-20 11:49:35,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-20 11:49:35,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2020-07-20 11:49:35,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-07-20 11:49:35,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 66 transitions. [2020-07-20 11:49:35,501 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 66 transitions. Word has length 62 [2020-07-20 11:49:35,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:49:35,502 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 66 transitions. [2020-07-20 11:49:35,502 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 11:49:35,502 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 66 transitions. [2020-07-20 11:49:35,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-07-20 11:49:35,503 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:49:35,504 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 5, 5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:49:35,717 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:35,718 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:49:35,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:49:35,719 INFO L82 PathProgramCache]: Analyzing trace with hash -1945307451, now seen corresponding path program 4 times [2020-07-20 11:49:35,719 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:49:35,720 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1046330717] [2020-07-20 11:49:35,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:35,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:49:35,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 11:49:35,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:49:35,919 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:49:35,968 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 18 proven. 42 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-20 11:49:35,968 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:49:35,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:49:36,089 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1046330717] [2020-07-20 11:49:36,089 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:49:36,089 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-07-20 11:49:36,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703002705] [2020-07-20 11:49:36,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 11:49:36,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:49:36,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 11:49:36,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2020-07-20 11:49:36,091 INFO L87 Difference]: Start difference. First operand 62 states and 66 transitions. Second operand 15 states. [2020-07-20 11:49:36,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:49:36,484 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-07-20 11:49:36,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 11:49:36,488 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 75 [2020-07-20 11:49:36,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:49:36,489 INFO L225 Difference]: With dead ends: 74 [2020-07-20 11:49:36,489 INFO L226 Difference]: Without dead ends: 72 [2020-07-20 11:49:36,490 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 68 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=121, Invalid=479, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:49:36,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-20 11:49:36,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-07-20 11:49:36,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 11:49:36,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 76 transitions. [2020-07-20 11:49:36,501 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 76 transitions. Word has length 75 [2020-07-20 11:49:36,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:49:36,502 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 76 transitions. [2020-07-20 11:49:36,502 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 11:49:36,502 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 76 transitions. [2020-07-20 11:49:36,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-07-20 11:49:36,503 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:49:36,504 INFO L422 BasicCegarLoop]: trace histogram [12, 11, 11, 6, 6, 6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:49:36,718 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:36,719 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:49:36,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:49:36,720 INFO L82 PathProgramCache]: Analyzing trace with hash -1067439347, now seen corresponding path program 5 times [2020-07-20 11:49:36,720 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:49:36,721 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [544747296] [2020-07-20 11:49:36,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:36,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:49:36,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 11:49:36,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:49:36,932 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:49:36,982 INFO L134 CoverageAnalysis]: Checked inductivity of 307 backedges. 22 proven. 65 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-20 11:49:36,982 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:49:37,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:49:37,127 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [544747296] [2020-07-20 11:49:37,128 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:49:37,128 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-07-20 11:49:37,128 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476439945] [2020-07-20 11:49:37,129 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 11:49:37,129 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:49:37,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 11:49:37,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=306, Unknown=0, NotChecked=0, Total=380 [2020-07-20 11:49:37,130 INFO L87 Difference]: Start difference. First operand 71 states and 76 transitions. Second operand 17 states. [2020-07-20 11:49:37,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:49:37,570 INFO L93 Difference]: Finished difference Result 83 states and 89 transitions. [2020-07-20 11:49:37,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 11:49:37,570 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 88 [2020-07-20 11:49:37,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:49:37,572 INFO L225 Difference]: With dead ends: 83 [2020-07-20 11:49:37,572 INFO L226 Difference]: Without dead ends: 81 [2020-07-20 11:49:37,573 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 79 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=140, Invalid=616, Unknown=0, NotChecked=0, Total=756 [2020-07-20 11:49:37,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-20 11:49:37,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2020-07-20 11:49:37,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-20 11:49:37,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 86 transitions. [2020-07-20 11:49:37,595 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 86 transitions. Word has length 88 [2020-07-20 11:49:37,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:49:37,598 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 86 transitions. [2020-07-20 11:49:37,598 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 11:49:37,598 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 86 transitions. [2020-07-20 11:49:37,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2020-07-20 11:49:37,600 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:49:37,600 INFO L422 BasicCegarLoop]: trace histogram [14, 13, 13, 7, 7, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:49:37,814 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:37,815 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:49:37,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:49:37,816 INFO L82 PathProgramCache]: Analyzing trace with hash -29217851, now seen corresponding path program 6 times [2020-07-20 11:49:37,816 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:49:37,817 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1621937576] [2020-07-20 11:49:37,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:37,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:49:37,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 11:49:37,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:49:38,104 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:49:38,163 INFO L134 CoverageAnalysis]: Checked inductivity of 431 backedges. 26 proven. 93 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-20 11:49:38,163 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:49:38,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:49:38,300 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1621937576] [2020-07-20 11:49:38,301 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:49:38,301 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-07-20 11:49:38,301 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634016069] [2020-07-20 11:49:38,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 11:49:38,302 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:49:38,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 11:49:38,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=378, Unknown=0, NotChecked=0, Total=462 [2020-07-20 11:49:38,304 INFO L87 Difference]: Start difference. First operand 80 states and 86 transitions. Second operand 19 states. [2020-07-20 11:49:38,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:49:38,880 INFO L93 Difference]: Finished difference Result 92 states and 99 transitions. [2020-07-20 11:49:38,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-20 11:49:38,880 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 101 [2020-07-20 11:49:38,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:49:38,883 INFO L225 Difference]: With dead ends: 92 [2020-07-20 11:49:38,883 INFO L226 Difference]: Without dead ends: 90 [2020-07-20 11:49:38,885 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 90 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=159, Invalid=771, Unknown=0, NotChecked=0, Total=930 [2020-07-20 11:49:38,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-20 11:49:38,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-07-20 11:49:38,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-07-20 11:49:38,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 96 transitions. [2020-07-20 11:49:38,897 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 96 transitions. Word has length 101 [2020-07-20 11:49:38,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:49:38,898 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 96 transitions. [2020-07-20 11:49:38,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 11:49:38,898 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 96 transitions. [2020-07-20 11:49:38,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-07-20 11:49:38,900 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:49:38,900 INFO L422 BasicCegarLoop]: trace histogram [16, 15, 15, 8, 8, 8, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:49:39,114 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:39,115 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:49:39,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:49:39,116 INFO L82 PathProgramCache]: Analyzing trace with hash 923342349, now seen corresponding path program 7 times [2020-07-20 11:49:39,116 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:49:39,117 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [9734067] [2020-07-20 11:49:39,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:39,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:49:39,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 11:49:39,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:49:39,385 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:49:39,449 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 30 proven. 126 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-20 11:49:39,450 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:49:39,482 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:49:39,619 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [9734067] [2020-07-20 11:49:39,620 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:49:39,620 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-07-20 11:49:39,620 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317240565] [2020-07-20 11:49:39,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:49:39,621 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:49:39,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:49:39,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=458, Unknown=0, NotChecked=0, Total=552 [2020-07-20 11:49:39,622 INFO L87 Difference]: Start difference. First operand 89 states and 96 transitions. Second operand 21 states. [2020-07-20 11:49:40,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:49:40,296 INFO L93 Difference]: Finished difference Result 101 states and 109 transitions. [2020-07-20 11:49:40,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-20 11:49:40,296 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 114 [2020-07-20 11:49:40,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:49:40,298 INFO L225 Difference]: With dead ends: 101 [2020-07-20 11:49:40,298 INFO L226 Difference]: Without dead ends: 99 [2020-07-20 11:49:40,299 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 101 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=178, Invalid=944, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 11:49:40,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-07-20 11:49:40,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2020-07-20 11:49:40,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-07-20 11:49:40,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 106 transitions. [2020-07-20 11:49:40,312 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 106 transitions. Word has length 114 [2020-07-20 11:49:40,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:49:40,313 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 106 transitions. [2020-07-20 11:49:40,313 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:49:40,313 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 106 transitions. [2020-07-20 11:49:40,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-07-20 11:49:40,315 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:49:40,315 INFO L422 BasicCegarLoop]: trace histogram [18, 17, 17, 9, 9, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:49:40,528 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:40,529 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:49:40,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:49:40,530 INFO L82 PathProgramCache]: Analyzing trace with hash 816783557, now seen corresponding path program 8 times [2020-07-20 11:49:40,530 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:49:40,531 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2040435627] [2020-07-20 11:49:40,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:40,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:49:40,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-20 11:49:40,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:49:40,854 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:49:40,919 INFO L134 CoverageAnalysis]: Checked inductivity of 742 backedges. 34 proven. 164 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-20 11:49:40,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:49:40,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:49:41,090 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2040435627] [2020-07-20 11:49:41,091 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:49:41,091 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-07-20 11:49:41,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843200945] [2020-07-20 11:49:41,092 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:49:41,092 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:49:41,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:49:41,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=546, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:49:41,093 INFO L87 Difference]: Start difference. First operand 98 states and 106 transitions. Second operand 23 states. [2020-07-20 11:49:41,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:49:41,842 INFO L93 Difference]: Finished difference Result 110 states and 119 transitions. [2020-07-20 11:49:41,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-20 11:49:41,842 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 127 [2020-07-20 11:49:41,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:49:41,845 INFO L225 Difference]: With dead ends: 110 [2020-07-20 11:49:41,845 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 11:49:41,846 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 112 SyntacticMatches, 3 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 376 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=197, Invalid=1135, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 11:49:41,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 11:49:41,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-07-20 11:49:41,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-20 11:49:41,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 116 transitions. [2020-07-20 11:49:41,860 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 116 transitions. Word has length 127 [2020-07-20 11:49:41,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:49:41,861 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 116 transitions. [2020-07-20 11:49:41,861 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:49:41,861 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 116 transitions. [2020-07-20 11:49:41,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2020-07-20 11:49:41,862 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:49:41,863 INFO L422 BasicCegarLoop]: trace histogram [20, 19, 19, 10, 10, 10, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:49:42,075 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:42,076 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:49:42,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:49:42,077 INFO L82 PathProgramCache]: Analyzing trace with hash -1777188595, now seen corresponding path program 9 times [2020-07-20 11:49:42,078 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:49:42,078 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1573164123] [2020-07-20 11:49:42,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:42,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:49:42,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-20 11:49:42,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:49:42,430 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:49:42,509 INFO L134 CoverageAnalysis]: Checked inductivity of 929 backedges. 38 proven. 207 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-20 11:49:42,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:49:42,545 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:49:42,689 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1573164123] [2020-07-20 11:49:42,690 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:49:42,690 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-07-20 11:49:42,690 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599322390] [2020-07-20 11:49:42,691 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 11:49:42,691 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:49:42,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 11:49:42,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=642, Unknown=0, NotChecked=0, Total=756 [2020-07-20 11:49:42,692 INFO L87 Difference]: Start difference. First operand 107 states and 116 transitions. Second operand 25 states. [2020-07-20 11:49:43,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:49:43,529 INFO L93 Difference]: Finished difference Result 119 states and 129 transitions. [2020-07-20 11:49:43,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 11:49:43,530 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 140 [2020-07-20 11:49:43,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:49:43,531 INFO L225 Difference]: With dead ends: 119 [2020-07-20 11:49:43,531 INFO L226 Difference]: Without dead ends: 117 [2020-07-20 11:49:43,533 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 123 SyntacticMatches, 3 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=216, Invalid=1344, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 11:49:43,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2020-07-20 11:49:43,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 116. [2020-07-20 11:49:43,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-20 11:49:43,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 126 transitions. [2020-07-20 11:49:43,546 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 126 transitions. Word has length 140 [2020-07-20 11:49:43,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:49:43,547 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 126 transitions. [2020-07-20 11:49:43,547 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 11:49:43,547 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 126 transitions. [2020-07-20 11:49:43,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2020-07-20 11:49:43,549 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:49:43,549 INFO L422 BasicCegarLoop]: trace histogram [22, 21, 21, 11, 11, 11, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:49:43,754 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:43,755 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:49:43,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:49:43,756 INFO L82 PathProgramCache]: Analyzing trace with hash -1994140219, now seen corresponding path program 10 times [2020-07-20 11:49:43,756 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:49:43,757 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [712898543] [2020-07-20 11:49:43,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:43,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:49:43,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 29 conjunts are in the unsatisfiable core [2020-07-20 11:49:43,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:49:44,175 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:49:44,260 INFO L134 CoverageAnalysis]: Checked inductivity of 1137 backedges. 42 proven. 255 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-20 11:49:44,261 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:49:44,303 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:49:44,468 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [712898543] [2020-07-20 11:49:44,468 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:49:44,468 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-07-20 11:49:44,468 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675490530] [2020-07-20 11:49:44,469 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 11:49:44,469 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:49:44,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 11:49:44,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=746, Unknown=0, NotChecked=0, Total=870 [2020-07-20 11:49:44,470 INFO L87 Difference]: Start difference. First operand 116 states and 126 transitions. Second operand 27 states. [2020-07-20 11:49:45,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:49:45,404 INFO L93 Difference]: Finished difference Result 128 states and 139 transitions. [2020-07-20 11:49:45,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-07-20 11:49:45,404 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 153 [2020-07-20 11:49:45,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:49:45,406 INFO L225 Difference]: With dead ends: 128 [2020-07-20 11:49:45,406 INFO L226 Difference]: Without dead ends: 126 [2020-07-20 11:49:45,407 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 134 SyntacticMatches, 3 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=235, Invalid=1571, Unknown=0, NotChecked=0, Total=1806 [2020-07-20 11:49:45,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-07-20 11:49:45,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2020-07-20 11:49:45,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-07-20 11:49:45,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 136 transitions. [2020-07-20 11:49:45,419 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 136 transitions. Word has length 153 [2020-07-20 11:49:45,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:49:45,420 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 136 transitions. [2020-07-20 11:49:45,420 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 11:49:45,420 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 136 transitions. [2020-07-20 11:49:45,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2020-07-20 11:49:45,422 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:49:45,422 INFO L422 BasicCegarLoop]: trace histogram [24, 23, 23, 12, 12, 12, 12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:49:45,635 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:45,636 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:49:45,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:49:45,636 INFO L82 PathProgramCache]: Analyzing trace with hash 1772858381, now seen corresponding path program 11 times [2020-07-20 11:49:45,636 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:49:45,636 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [884396682] [2020-07-20 11:49:45,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:45,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:49:45,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 31 conjunts are in the unsatisfiable core [2020-07-20 11:49:45,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:49:46,122 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:49:46,233 INFO L134 CoverageAnalysis]: Checked inductivity of 1366 backedges. 46 proven. 308 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-20 11:49:46,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:49:46,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:49:46,423 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [884396682] [2020-07-20 11:49:46,423 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:49:46,423 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-07-20 11:49:46,424 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113348695] [2020-07-20 11:49:46,424 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 11:49:46,424 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:49:46,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 11:49:46,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=858, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:49:46,426 INFO L87 Difference]: Start difference. First operand 125 states and 136 transitions. Second operand 29 states. [2020-07-20 11:49:47,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:49:47,531 INFO L93 Difference]: Finished difference Result 137 states and 149 transitions. [2020-07-20 11:49:47,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-20 11:49:47,532 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 166 [2020-07-20 11:49:47,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:49:47,534 INFO L225 Difference]: With dead ends: 137 [2020-07-20 11:49:47,534 INFO L226 Difference]: Without dead ends: 135 [2020-07-20 11:49:47,536 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 145 SyntacticMatches, 3 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 631 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=254, Invalid=1816, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 11:49:47,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2020-07-20 11:49:47,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 134. [2020-07-20 11:49:47,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2020-07-20 11:49:47,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 146 transitions. [2020-07-20 11:49:47,549 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 146 transitions. Word has length 166 [2020-07-20 11:49:47,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:49:47,550 INFO L479 AbstractCegarLoop]: Abstraction has 134 states and 146 transitions. [2020-07-20 11:49:47,550 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 11:49:47,550 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 146 transitions. [2020-07-20 11:49:47,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2020-07-20 11:49:47,552 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:49:47,553 INFO L422 BasicCegarLoop]: trace histogram [26, 25, 25, 13, 13, 13, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:49:47,766 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:47,767 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:49:47,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:49:47,768 INFO L82 PathProgramCache]: Analyzing trace with hash -915387707, now seen corresponding path program 12 times [2020-07-20 11:49:47,768 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:49:47,768 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [785917814] [2020-07-20 11:49:47,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:47,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:49:47,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 33 conjunts are in the unsatisfiable core [2020-07-20 11:49:47,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:49:48,308 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:49:48,397 INFO L134 CoverageAnalysis]: Checked inductivity of 1616 backedges. 50 proven. 366 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-20 11:49:48,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:49:48,443 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:49:48,618 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [785917814] [2020-07-20 11:49:48,619 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:49:48,619 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-07-20 11:49:48,620 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527598040] [2020-07-20 11:49:48,620 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 11:49:48,621 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:49:48,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 11:49:48,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=978, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 11:49:48,625 INFO L87 Difference]: Start difference. First operand 134 states and 146 transitions. Second operand 31 states. [2020-07-20 11:49:50,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:49:50,004 INFO L93 Difference]: Finished difference Result 146 states and 159 transitions. [2020-07-20 11:49:50,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-07-20 11:49:50,004 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 179 [2020-07-20 11:49:50,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:49:50,006 INFO L225 Difference]: With dead ends: 146 [2020-07-20 11:49:50,006 INFO L226 Difference]: Without dead ends: 144 [2020-07-20 11:49:50,007 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 156 SyntacticMatches, 3 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 730 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=273, Invalid=2079, Unknown=0, NotChecked=0, Total=2352 [2020-07-20 11:49:50,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2020-07-20 11:49:50,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 143. [2020-07-20 11:49:50,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2020-07-20 11:49:50,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 156 transitions. [2020-07-20 11:49:50,019 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 156 transitions. Word has length 179 [2020-07-20 11:49:50,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:49:50,019 INFO L479 AbstractCegarLoop]: Abstraction has 143 states and 156 transitions. [2020-07-20 11:49:50,019 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 11:49:50,020 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 156 transitions. [2020-07-20 11:49:50,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2020-07-20 11:49:50,022 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:49:50,022 INFO L422 BasicCegarLoop]: trace histogram [28, 27, 27, 14, 14, 14, 14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:49:50,236 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:50,237 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:49:50,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:49:50,238 INFO L82 PathProgramCache]: Analyzing trace with hash 1644517133, now seen corresponding path program 13 times [2020-07-20 11:49:50,238 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:49:50,238 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1669255673] [2020-07-20 11:49:50,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:50,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:49:50,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 370 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-20 11:49:50,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:49:50,833 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:49:50,951 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 54 proven. 429 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-20 11:49:50,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:49:51,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:49:51,180 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1669255673] [2020-07-20 11:49:51,180 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:49:51,181 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-07-20 11:49:51,181 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861582932] [2020-07-20 11:49:51,182 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 11:49:51,182 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:49:51,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 11:49:51,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=1106, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 11:49:51,183 INFO L87 Difference]: Start difference. First operand 143 states and 156 transitions. Second operand 33 states. [2020-07-20 11:49:52,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:49:52,662 INFO L93 Difference]: Finished difference Result 155 states and 169 transitions. [2020-07-20 11:49:52,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-20 11:49:52,662 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 192 [2020-07-20 11:49:52,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:49:52,665 INFO L225 Difference]: With dead ends: 155 [2020-07-20 11:49:52,665 INFO L226 Difference]: Without dead ends: 153 [2020-07-20 11:49:52,666 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 167 SyntacticMatches, 3 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 836 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=292, Invalid=2360, Unknown=0, NotChecked=0, Total=2652 [2020-07-20 11:49:52,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2020-07-20 11:49:52,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 152. [2020-07-20 11:49:52,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2020-07-20 11:49:52,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 166 transitions. [2020-07-20 11:49:52,680 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 166 transitions. Word has length 192 [2020-07-20 11:49:52,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:49:52,680 INFO L479 AbstractCegarLoop]: Abstraction has 152 states and 166 transitions. [2020-07-20 11:49:52,680 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 11:49:52,681 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 166 transitions. [2020-07-20 11:49:52,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2020-07-20 11:49:52,687 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:49:52,687 INFO L422 BasicCegarLoop]: trace histogram [30, 29, 29, 15, 15, 15, 15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:49:52,901 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:52,902 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:49:52,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:49:52,902 INFO L82 PathProgramCache]: Analyzing trace with hash 258244549, now seen corresponding path program 14 times [2020-07-20 11:49:52,902 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:49:52,902 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [498623141] [2020-07-20 11:49:52,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:52,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:49:52,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 37 conjunts are in the unsatisfiable core [2020-07-20 11:49:52,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:49:53,568 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:49:53,687 INFO L134 CoverageAnalysis]: Checked inductivity of 2179 backedges. 58 proven. 497 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-20 11:49:53,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:49:53,740 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:49:53,929 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [498623141] [2020-07-20 11:49:53,929 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:49:53,929 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-07-20 11:49:53,930 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477347309] [2020-07-20 11:49:53,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-20 11:49:53,931 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:49:53,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-20 11:49:53,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=1242, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 11:49:53,932 INFO L87 Difference]: Start difference. First operand 152 states and 166 transitions. Second operand 35 states. [2020-07-20 11:49:55,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:49:55,620 INFO L93 Difference]: Finished difference Result 164 states and 179 transitions. [2020-07-20 11:49:55,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-07-20 11:49:55,621 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 205 [2020-07-20 11:49:55,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:49:55,622 INFO L225 Difference]: With dead ends: 164 [2020-07-20 11:49:55,623 INFO L226 Difference]: Without dead ends: 162 [2020-07-20 11:49:55,625 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 178 SyntacticMatches, 3 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 949 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=311, Invalid=2659, Unknown=0, NotChecked=0, Total=2970 [2020-07-20 11:49:55,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-07-20 11:49:55,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 161. [2020-07-20 11:49:55,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 161 states. [2020-07-20 11:49:55,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 176 transitions. [2020-07-20 11:49:55,639 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 176 transitions. Word has length 205 [2020-07-20 11:49:55,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:49:55,641 INFO L479 AbstractCegarLoop]: Abstraction has 161 states and 176 transitions. [2020-07-20 11:49:55,641 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-20 11:49:55,642 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 176 transitions. [2020-07-20 11:49:55,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2020-07-20 11:49:55,648 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:49:55,648 INFO L422 BasicCegarLoop]: trace histogram [32, 31, 31, 16, 16, 16, 16, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:49:55,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:55,863 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:49:55,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:49:55,864 INFO L82 PathProgramCache]: Analyzing trace with hash 1397703181, now seen corresponding path program 15 times [2020-07-20 11:49:55,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:49:55,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1283434010] [2020-07-20 11:49:55,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:55,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:49:55,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-20 11:49:55,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:49:56,636 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:49:56,765 INFO L134 CoverageAnalysis]: Checked inductivity of 2492 backedges. 62 proven. 570 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-20 11:49:56,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:49:56,820 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:49:57,018 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1283434010] [2020-07-20 11:49:57,018 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:49:57,018 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-07-20 11:49:57,019 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [51457819] [2020-07-20 11:49:57,019 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-20 11:49:57,020 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:49:57,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-20 11:49:57,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1386, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 11:49:57,021 INFO L87 Difference]: Start difference. First operand 161 states and 176 transitions. Second operand 37 states. [2020-07-20 11:49:58,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:49:58,845 INFO L93 Difference]: Finished difference Result 173 states and 189 transitions. [2020-07-20 11:49:58,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-20 11:49:58,846 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 218 [2020-07-20 11:49:58,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:49:58,848 INFO L225 Difference]: With dead ends: 173 [2020-07-20 11:49:58,849 INFO L226 Difference]: Without dead ends: 171 [2020-07-20 11:49:58,851 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 189 SyntacticMatches, 3 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1069 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=330, Invalid=2976, Unknown=0, NotChecked=0, Total=3306 [2020-07-20 11:49:58,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2020-07-20 11:49:58,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 170. [2020-07-20 11:49:58,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2020-07-20 11:49:58,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 186 transitions. [2020-07-20 11:49:58,864 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 186 transitions. Word has length 218 [2020-07-20 11:49:58,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:49:58,865 INFO L479 AbstractCegarLoop]: Abstraction has 170 states and 186 transitions. [2020-07-20 11:49:58,865 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-20 11:49:58,865 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 186 transitions. [2020-07-20 11:49:58,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2020-07-20 11:49:58,867 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:49:58,867 INFO L422 BasicCegarLoop]: trace histogram [34, 33, 33, 17, 17, 17, 17, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:49:59,079 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:59,080 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:49:59,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:49:59,081 INFO L82 PathProgramCache]: Analyzing trace with hash -724536123, now seen corresponding path program 16 times [2020-07-20 11:49:59,081 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:49:59,082 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1843076717] [2020-07-20 11:49:59,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:59,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:49:59,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 442 conjuncts, 41 conjunts are in the unsatisfiable core [2020-07-20 11:49:59,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:49:59,905 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:50:00,035 INFO L134 CoverageAnalysis]: Checked inductivity of 2826 backedges. 66 proven. 648 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-20 11:50:00,035 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:50:00,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:50:00,315 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1843076717] [2020-07-20 11:50:00,315 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:50:00,316 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-07-20 11:50:00,316 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666602549] [2020-07-20 11:50:00,317 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-07-20 11:50:00,317 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:50:00,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-07-20 11:50:00,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1538, Unknown=0, NotChecked=0, Total=1722 [2020-07-20 11:50:00,318 INFO L87 Difference]: Start difference. First operand 170 states and 186 transitions. Second operand 39 states. [2020-07-20 11:50:02,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:50:02,469 INFO L93 Difference]: Finished difference Result 182 states and 199 transitions. [2020-07-20 11:50:02,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-07-20 11:50:02,469 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 231 [2020-07-20 11:50:02,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:50:02,471 INFO L225 Difference]: With dead ends: 182 [2020-07-20 11:50:02,471 INFO L226 Difference]: Without dead ends: 180 [2020-07-20 11:50:02,476 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 200 SyntacticMatches, 3 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1196 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=349, Invalid=3311, Unknown=0, NotChecked=0, Total=3660 [2020-07-20 11:50:02,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2020-07-20 11:50:02,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 179. [2020-07-20 11:50:02,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2020-07-20 11:50:02,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 196 transitions. [2020-07-20 11:50:02,490 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 196 transitions. Word has length 231 [2020-07-20 11:50:02,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:50:02,490 INFO L479 AbstractCegarLoop]: Abstraction has 179 states and 196 transitions. [2020-07-20 11:50:02,491 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-07-20 11:50:02,491 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 196 transitions. [2020-07-20 11:50:02,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2020-07-20 11:50:02,492 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:50:02,493 INFO L422 BasicCegarLoop]: trace histogram [36, 35, 35, 18, 18, 18, 18, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:50:02,706 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:50:02,706 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:50:02,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:50:02,707 INFO L82 PathProgramCache]: Analyzing trace with hash 901344525, now seen corresponding path program 17 times [2020-07-20 11:50:02,707 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:50:02,707 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1738511541] [2020-07-20 11:50:02,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:50:02,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:50:02,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 466 conjuncts, 43 conjunts are in the unsatisfiable core [2020-07-20 11:50:02,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:50:03,580 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:50:03,723 INFO L134 CoverageAnalysis]: Checked inductivity of 3181 backedges. 70 proven. 731 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-20 11:50:03,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:50:03,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:50:04,012 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1738511541] [2020-07-20 11:50:04,012 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:50:04,012 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-07-20 11:50:04,013 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542630634] [2020-07-20 11:50:04,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-07-20 11:50:04,013 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:50:04,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-07-20 11:50:04,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=1698, Unknown=0, NotChecked=0, Total=1892 [2020-07-20 11:50:04,015 INFO L87 Difference]: Start difference. First operand 179 states and 196 transitions. Second operand 41 states. [2020-07-20 11:50:06,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:50:06,273 INFO L93 Difference]: Finished difference Result 191 states and 209 transitions. [2020-07-20 11:50:06,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-07-20 11:50:06,274 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 244 [2020-07-20 11:50:06,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:50:06,275 INFO L225 Difference]: With dead ends: 191 [2020-07-20 11:50:06,275 INFO L226 Difference]: Without dead ends: 189 [2020-07-20 11:50:06,277 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 211 SyntacticMatches, 3 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1330 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=368, Invalid=3664, Unknown=0, NotChecked=0, Total=4032 [2020-07-20 11:50:06,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2020-07-20 11:50:06,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 188. [2020-07-20 11:50:06,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2020-07-20 11:50:06,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 206 transitions. [2020-07-20 11:50:06,291 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 206 transitions. Word has length 244 [2020-07-20 11:50:06,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:50:06,292 INFO L479 AbstractCegarLoop]: Abstraction has 188 states and 206 transitions. [2020-07-20 11:50:06,292 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-07-20 11:50:06,292 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 206 transitions. [2020-07-20 11:50:06,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2020-07-20 11:50:06,294 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:50:06,294 INFO L422 BasicCegarLoop]: trace histogram [38, 37, 37, 19, 19, 19, 19, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:50:06,507 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:50:06,508 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:50:06,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:50:06,509 INFO L82 PathProgramCache]: Analyzing trace with hash -276551227, now seen corresponding path program 18 times [2020-07-20 11:50:06,509 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:50:06,509 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [780042504] [2020-07-20 11:50:06,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:50:06,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:50:06,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 490 conjuncts, 45 conjunts are in the unsatisfiable core [2020-07-20 11:50:06,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:50:07,492 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:50:07,659 INFO L134 CoverageAnalysis]: Checked inductivity of 3557 backedges. 74 proven. 819 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-20 11:50:07,659 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:50:07,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:50:07,961 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [780042504] [2020-07-20 11:50:07,961 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:50:07,961 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-07-20 11:50:07,962 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358124648] [2020-07-20 11:50:07,962 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-07-20 11:50:07,962 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:50:07,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-07-20 11:50:07,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=1866, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 11:50:07,963 INFO L87 Difference]: Start difference. First operand 188 states and 206 transitions. Second operand 43 states. [2020-07-20 11:50:10,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:50:10,307 INFO L93 Difference]: Finished difference Result 200 states and 219 transitions. [2020-07-20 11:50:10,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-07-20 11:50:10,308 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 257 [2020-07-20 11:50:10,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:50:10,311 INFO L225 Difference]: With dead ends: 200 [2020-07-20 11:50:10,311 INFO L226 Difference]: Without dead ends: 198 [2020-07-20 11:50:10,313 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 222 SyntacticMatches, 3 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1471 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=387, Invalid=4035, Unknown=0, NotChecked=0, Total=4422 [2020-07-20 11:50:10,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2020-07-20 11:50:10,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 197. [2020-07-20 11:50:10,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2020-07-20 11:50:10,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 216 transitions. [2020-07-20 11:50:10,327 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 216 transitions. Word has length 257 [2020-07-20 11:50:10,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:50:10,328 INFO L479 AbstractCegarLoop]: Abstraction has 197 states and 216 transitions. [2020-07-20 11:50:10,328 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-07-20 11:50:10,328 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 216 transitions. [2020-07-20 11:50:10,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 271 [2020-07-20 11:50:10,330 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:50:10,330 INFO L422 BasicCegarLoop]: trace histogram [40, 39, 39, 20, 20, 20, 20, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:50:10,537 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:50:10,538 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:50:10,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:50:10,539 INFO L82 PathProgramCache]: Analyzing trace with hash 628348941, now seen corresponding path program 19 times [2020-07-20 11:50:10,539 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:50:10,539 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [963697007] [2020-07-20 11:50:10,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:50:10,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:50:10,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 514 conjuncts, 47 conjunts are in the unsatisfiable core [2020-07-20 11:50:10,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:50:11,591 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:50:11,775 INFO L134 CoverageAnalysis]: Checked inductivity of 3954 backedges. 78 proven. 912 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-20 11:50:11,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:50:11,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:50:12,090 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [963697007] [2020-07-20 11:50:12,091 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:50:12,091 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-07-20 11:50:12,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303551503] [2020-07-20 11:50:12,092 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-07-20 11:50:12,092 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:50:12,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-07-20 11:50:12,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=2042, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 11:50:12,093 INFO L87 Difference]: Start difference. First operand 197 states and 216 transitions. Second operand 45 states. [2020-07-20 11:50:14,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:50:14,677 INFO L93 Difference]: Finished difference Result 209 states and 229 transitions. [2020-07-20 11:50:14,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-20 11:50:14,677 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 270 [2020-07-20 11:50:14,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:50:14,679 INFO L225 Difference]: With dead ends: 209 [2020-07-20 11:50:14,680 INFO L226 Difference]: Without dead ends: 207 [2020-07-20 11:50:14,682 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 233 SyntacticMatches, 3 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1619 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=406, Invalid=4424, Unknown=0, NotChecked=0, Total=4830 [2020-07-20 11:50:14,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2020-07-20 11:50:14,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 206. [2020-07-20 11:50:14,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2020-07-20 11:50:14,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 226 transitions. [2020-07-20 11:50:14,698 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 226 transitions. Word has length 270 [2020-07-20 11:50:14,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:50:14,699 INFO L479 AbstractCegarLoop]: Abstraction has 206 states and 226 transitions. [2020-07-20 11:50:14,699 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-07-20 11:50:14,699 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 226 transitions. [2020-07-20 11:50:14,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 284 [2020-07-20 11:50:14,701 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:50:14,701 INFO L422 BasicCegarLoop]: trace histogram [42, 41, 41, 21, 21, 21, 21, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:50:14,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:50:14,915 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:50:14,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:50:14,916 INFO L82 PathProgramCache]: Analyzing trace with hash -1857052987, now seen corresponding path program 20 times [2020-07-20 11:50:14,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:50:14,916 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [807319516] [2020-07-20 11:50:14,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:50:15,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:50:15,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 538 conjuncts, 49 conjunts are in the unsatisfiable core [2020-07-20 11:50:15,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:50:16,079 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:50:16,275 INFO L134 CoverageAnalysis]: Checked inductivity of 4372 backedges. 82 proven. 1010 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-20 11:50:16,275 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:50:16,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:50:16,612 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [807319516] [2020-07-20 11:50:16,613 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:50:16,613 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-07-20 11:50:16,613 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1246980244] [2020-07-20 11:50:16,613 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-07-20 11:50:16,614 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:50:16,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-07-20 11:50:16,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=2226, Unknown=0, NotChecked=0, Total=2450 [2020-07-20 11:50:16,615 INFO L87 Difference]: Start difference. First operand 206 states and 226 transitions. Second operand 47 states. [2020-07-20 11:50:19,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:50:19,367 INFO L93 Difference]: Finished difference Result 218 states and 239 transitions. [2020-07-20 11:50:19,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-07-20 11:50:19,369 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 283 [2020-07-20 11:50:19,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:50:19,372 INFO L225 Difference]: With dead ends: 218 [2020-07-20 11:50:19,372 INFO L226 Difference]: Without dead ends: 216 [2020-07-20 11:50:19,373 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 244 SyntacticMatches, 3 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1774 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=425, Invalid=4831, Unknown=0, NotChecked=0, Total=5256 [2020-07-20 11:50:19,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2020-07-20 11:50:19,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 215. [2020-07-20 11:50:19,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 215 states. [2020-07-20 11:50:19,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 236 transitions. [2020-07-20 11:50:19,388 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 236 transitions. Word has length 283 [2020-07-20 11:50:19,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:50:19,389 INFO L479 AbstractCegarLoop]: Abstraction has 215 states and 236 transitions. [2020-07-20 11:50:19,389 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-07-20 11:50:19,389 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 236 transitions. [2020-07-20 11:50:19,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2020-07-20 11:50:19,391 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:50:19,391 INFO L422 BasicCegarLoop]: trace histogram [44, 43, 43, 22, 22, 22, 22, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:50:19,600 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:50:19,601 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:50:19,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:50:19,602 INFO L82 PathProgramCache]: Analyzing trace with hash 1655603981, now seen corresponding path program 21 times [2020-07-20 11:50:19,602 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:50:19,602 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1140366871] [2020-07-20 11:50:19,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:50:19,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:50:19,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 562 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-20 11:50:19,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:50:21,017 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:50:21,218 INFO L134 CoverageAnalysis]: Checked inductivity of 4811 backedges. 86 proven. 1113 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-20 11:50:21,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:50:21,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:50:21,582 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1140366871] [2020-07-20 11:50:21,583 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:50:21,583 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-07-20 11:50:21,583 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672091623] [2020-07-20 11:50:21,584 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-07-20 11:50:21,584 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:50:21,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-07-20 11:50:21,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=2418, Unknown=0, NotChecked=0, Total=2652 [2020-07-20 11:50:21,585 INFO L87 Difference]: Start difference. First operand 215 states and 236 transitions. Second operand 49 states. [2020-07-20 11:50:24,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:50:24,950 INFO L93 Difference]: Finished difference Result 227 states and 249 transitions. [2020-07-20 11:50:24,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2020-07-20 11:50:24,950 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 296 [2020-07-20 11:50:24,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:50:24,953 INFO L225 Difference]: With dead ends: 227 [2020-07-20 11:50:24,953 INFO L226 Difference]: Without dead ends: 225 [2020-07-20 11:50:24,954 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 255 SyntacticMatches, 3 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1936 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=444, Invalid=5256, Unknown=0, NotChecked=0, Total=5700 [2020-07-20 11:50:24,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2020-07-20 11:50:24,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 224. [2020-07-20 11:50:24,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2020-07-20 11:50:24,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 246 transitions. [2020-07-20 11:50:24,968 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 246 transitions. Word has length 296 [2020-07-20 11:50:24,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:50:24,969 INFO L479 AbstractCegarLoop]: Abstraction has 224 states and 246 transitions. [2020-07-20 11:50:24,969 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-07-20 11:50:24,969 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 246 transitions. [2020-07-20 11:50:24,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2020-07-20 11:50:24,970 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:50:24,970 INFO L422 BasicCegarLoop]: trace histogram [46, 45, 45, 23, 23, 23, 23, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:50:25,171 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:50:25,172 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:50:25,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:50:25,173 INFO L82 PathProgramCache]: Analyzing trace with hash 1208144837, now seen corresponding path program 22 times [2020-07-20 11:50:25,173 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:50:25,173 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [496403016] [2020-07-20 11:50:25,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:50:25,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:50:25,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 586 conjuncts, 53 conjunts are in the unsatisfiable core [2020-07-20 11:50:25,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:50:26,571 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:50:26,780 INFO L134 CoverageAnalysis]: Checked inductivity of 5271 backedges. 90 proven. 1221 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-20 11:50:26,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:50:26,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:50:27,158 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [496403016] [2020-07-20 11:50:27,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:50:27,159 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-07-20 11:50:27,159 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [144671241] [2020-07-20 11:50:27,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-07-20 11:50:27,160 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:50:27,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-07-20 11:50:27,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=244, Invalid=2618, Unknown=0, NotChecked=0, Total=2862 [2020-07-20 11:50:27,161 INFO L87 Difference]: Start difference. First operand 224 states and 246 transitions. Second operand 51 states. [2020-07-20 11:50:30,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:50:30,530 INFO L93 Difference]: Finished difference Result 236 states and 259 transitions. [2020-07-20 11:50:30,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2020-07-20 11:50:30,531 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 309 [2020-07-20 11:50:30,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:50:30,533 INFO L225 Difference]: With dead ends: 236 [2020-07-20 11:50:30,533 INFO L226 Difference]: Without dead ends: 234 [2020-07-20 11:50:30,534 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 266 SyntacticMatches, 3 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2105 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=463, Invalid=5699, Unknown=0, NotChecked=0, Total=6162 [2020-07-20 11:50:30,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2020-07-20 11:50:30,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 233. [2020-07-20 11:50:30,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 233 states. [2020-07-20 11:50:30,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 256 transitions. [2020-07-20 11:50:30,551 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 256 transitions. Word has length 309 [2020-07-20 11:50:30,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:50:30,552 INFO L479 AbstractCegarLoop]: Abstraction has 233 states and 256 transitions. [2020-07-20 11:50:30,552 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-07-20 11:50:30,552 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 256 transitions. [2020-07-20 11:50:30,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2020-07-20 11:50:30,554 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:50:30,554 INFO L422 BasicCegarLoop]: trace histogram [48, 47, 47, 24, 24, 24, 24, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:50:30,768 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:50:30,769 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:50:30,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:50:30,770 INFO L82 PathProgramCache]: Analyzing trace with hash 1369009677, now seen corresponding path program 23 times [2020-07-20 11:50:30,770 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:50:30,770 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [249740875] [2020-07-20 11:50:30,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:50:30,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:50:30,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 610 conjuncts, 55 conjunts are in the unsatisfiable core [2020-07-20 11:50:30,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:50:32,279 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:50:32,516 INFO L134 CoverageAnalysis]: Checked inductivity of 5752 backedges. 94 proven. 1334 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-20 11:50:32,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:50:32,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:50:32,916 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [249740875] [2020-07-20 11:50:32,916 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:50:32,916 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-07-20 11:50:32,917 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278734536] [2020-07-20 11:50:32,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-07-20 11:50:32,918 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:50:32,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-07-20 11:50:32,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=2826, Unknown=0, NotChecked=0, Total=3080 [2020-07-20 11:50:32,918 INFO L87 Difference]: Start difference. First operand 233 states and 256 transitions. Second operand 53 states. [2020-07-20 11:50:36,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:50:36,727 INFO L93 Difference]: Finished difference Result 245 states and 269 transitions. [2020-07-20 11:50:36,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2020-07-20 11:50:36,728 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 322 [2020-07-20 11:50:36,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:50:36,730 INFO L225 Difference]: With dead ends: 245 [2020-07-20 11:50:36,730 INFO L226 Difference]: Without dead ends: 243 [2020-07-20 11:50:36,731 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 277 SyntacticMatches, 3 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2281 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=482, Invalid=6160, Unknown=0, NotChecked=0, Total=6642 [2020-07-20 11:50:36,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2020-07-20 11:50:36,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 242. [2020-07-20 11:50:36,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 242 states. [2020-07-20 11:50:36,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 266 transitions. [2020-07-20 11:50:36,750 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 266 transitions. Word has length 322 [2020-07-20 11:50:36,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:50:36,751 INFO L479 AbstractCegarLoop]: Abstraction has 242 states and 266 transitions. [2020-07-20 11:50:36,751 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-07-20 11:50:36,751 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 266 transitions. [2020-07-20 11:50:36,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2020-07-20 11:50:36,753 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:50:36,753 INFO L422 BasicCegarLoop]: trace histogram [50, 49, 49, 25, 25, 25, 25, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:50:36,968 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:50:36,969 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:50:36,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:50:36,969 INFO L82 PathProgramCache]: Analyzing trace with hash -43136827, now seen corresponding path program 24 times [2020-07-20 11:50:36,969 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:50:36,970 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [969286271] [2020-07-20 11:50:36,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:50:37,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:50:37,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 634 conjuncts, 57 conjunts are in the unsatisfiable core [2020-07-20 11:50:37,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:50:38,635 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:50:38,881 INFO L134 CoverageAnalysis]: Checked inductivity of 6254 backedges. 98 proven. 1452 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-20 11:50:38,881 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:50:38,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:50:39,304 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [969286271] [2020-07-20 11:50:39,305 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:50:39,305 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-07-20 11:50:39,305 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120574134] [2020-07-20 11:50:39,306 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-07-20 11:50:39,306 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:50:39,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-07-20 11:50:39,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=3042, Unknown=0, NotChecked=0, Total=3306 [2020-07-20 11:50:39,307 INFO L87 Difference]: Start difference. First operand 242 states and 266 transitions. Second operand 55 states. [2020-07-20 11:50:43,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:50:43,247 INFO L93 Difference]: Finished difference Result 254 states and 279 transitions. [2020-07-20 11:50:43,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2020-07-20 11:50:43,248 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 335 [2020-07-20 11:50:43,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:50:43,251 INFO L225 Difference]: With dead ends: 254 [2020-07-20 11:50:43,251 INFO L226 Difference]: Without dead ends: 252 [2020-07-20 11:50:43,252 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 374 GetRequests, 288 SyntacticMatches, 3 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2464 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=501, Invalid=6639, Unknown=0, NotChecked=0, Total=7140 [2020-07-20 11:50:43,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2020-07-20 11:50:43,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 251. [2020-07-20 11:50:43,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 251 states. [2020-07-20 11:50:43,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 276 transitions. [2020-07-20 11:50:43,272 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 276 transitions. Word has length 335 [2020-07-20 11:50:43,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:50:43,272 INFO L479 AbstractCegarLoop]: Abstraction has 251 states and 276 transitions. [2020-07-20 11:50:43,272 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-07-20 11:50:43,272 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 276 transitions. [2020-07-20 11:50:43,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 349 [2020-07-20 11:50:43,275 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:50:43,275 INFO L422 BasicCegarLoop]: trace histogram [52, 51, 51, 26, 26, 26, 26, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:50:43,481 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:50:43,481 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:50:43,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:50:43,482 INFO L82 PathProgramCache]: Analyzing trace with hash 2053413133, now seen corresponding path program 25 times [2020-07-20 11:50:43,483 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:50:43,483 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [697168378] [2020-07-20 11:50:43,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:50:43,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:50:43,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 658 conjuncts, 59 conjunts are in the unsatisfiable core [2020-07-20 11:50:43,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:50:45,327 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:50:45,583 INFO L134 CoverageAnalysis]: Checked inductivity of 6777 backedges. 102 proven. 1575 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-20 11:50:45,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:50:45,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:50:46,074 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [697168378] [2020-07-20 11:50:46,075 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:50:46,075 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-07-20 11:50:46,075 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1855486050] [2020-07-20 11:50:46,076 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-07-20 11:50:46,076 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:50:46,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-07-20 11:50:46,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=3266, Unknown=0, NotChecked=0, Total=3540 [2020-07-20 11:50:46,077 INFO L87 Difference]: Start difference. First operand 251 states and 276 transitions. Second operand 57 states. [2020-07-20 11:50:50,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:50:50,537 INFO L93 Difference]: Finished difference Result 263 states and 289 transitions. [2020-07-20 11:50:50,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2020-07-20 11:50:50,538 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 348 [2020-07-20 11:50:50,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:50:50,541 INFO L225 Difference]: With dead ends: 263 [2020-07-20 11:50:50,541 INFO L226 Difference]: Without dead ends: 261 [2020-07-20 11:50:50,542 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 299 SyntacticMatches, 3 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2654 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=520, Invalid=7136, Unknown=0, NotChecked=0, Total=7656 [2020-07-20 11:50:50,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2020-07-20 11:50:50,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 260. [2020-07-20 11:50:50,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 260 states. [2020-07-20 11:50:50,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 286 transitions. [2020-07-20 11:50:50,562 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 286 transitions. Word has length 348 [2020-07-20 11:50:50,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:50:50,563 INFO L479 AbstractCegarLoop]: Abstraction has 260 states and 286 transitions. [2020-07-20 11:50:50,563 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-07-20 11:50:50,563 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 286 transitions. [2020-07-20 11:50:50,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 362 [2020-07-20 11:50:50,565 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:50:50,566 INFO L422 BasicCegarLoop]: trace histogram [54, 53, 53, 27, 27, 27, 27, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:50:50,778 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:50:50,779 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:50:50,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:50:50,779 INFO L82 PathProgramCache]: Analyzing trace with hash -144671291, now seen corresponding path program 26 times [2020-07-20 11:50:50,779 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:50:50,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1706626163] [2020-07-20 11:50:50,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:50:50,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:50:50,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 682 conjuncts, 61 conjunts are in the unsatisfiable core [2020-07-20 11:50:50,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:50:52,682 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:50:52,961 INFO L134 CoverageAnalysis]: Checked inductivity of 7321 backedges. 106 proven. 1703 refuted. 0 times theorem prover too weak. 5512 trivial. 0 not checked. [2020-07-20 11:50:52,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:50:53,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:50:53,449 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1706626163] [2020-07-20 11:50:53,450 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:50:53,450 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2020-07-20 11:50:53,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090917551] [2020-07-20 11:50:53,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-07-20 11:50:53,451 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:50:53,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-07-20 11:50:53,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=284, Invalid=3498, Unknown=0, NotChecked=0, Total=3782 [2020-07-20 11:50:53,452 INFO L87 Difference]: Start difference. First operand 260 states and 286 transitions. Second operand 59 states. [2020-07-20 11:50:58,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:50:58,240 INFO L93 Difference]: Finished difference Result 272 states and 299 transitions. [2020-07-20 11:50:58,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2020-07-20 11:50:58,241 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 361 [2020-07-20 11:50:58,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:50:58,243 INFO L225 Difference]: With dead ends: 272 [2020-07-20 11:50:58,243 INFO L226 Difference]: Without dead ends: 270 [2020-07-20 11:50:58,244 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 310 SyntacticMatches, 3 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2851 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=539, Invalid=7651, Unknown=0, NotChecked=0, Total=8190 [2020-07-20 11:50:58,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2020-07-20 11:50:58,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 269. [2020-07-20 11:50:58,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 269 states. [2020-07-20 11:50:58,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 296 transitions. [2020-07-20 11:50:58,266 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 296 transitions. Word has length 361 [2020-07-20 11:50:58,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:50:58,279 INFO L479 AbstractCegarLoop]: Abstraction has 269 states and 296 transitions. [2020-07-20 11:50:58,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-07-20 11:50:58,279 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 296 transitions. [2020-07-20 11:50:58,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 375 [2020-07-20 11:50:58,281 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:50:58,282 INFO L422 BasicCegarLoop]: trace histogram [56, 55, 55, 28, 28, 28, 28, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:50:58,495 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:50:58,496 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:50:58,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:50:58,497 INFO L82 PathProgramCache]: Analyzing trace with hash -1992293363, now seen corresponding path program 27 times [2020-07-20 11:50:58,497 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:50:58,498 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [38712702] [2020-07-20 11:50:58,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:50:58,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:50:58,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 706 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-20 11:50:58,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:51:00,640 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:51:00,951 INFO L134 CoverageAnalysis]: Checked inductivity of 7886 backedges. 110 proven. 1836 refuted. 0 times theorem prover too weak. 5940 trivial. 0 not checked. [2020-07-20 11:51:00,951 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:51:01,066 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:51:01,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [38712702] [2020-07-20 11:51:01,461 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:51:01,461 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2020-07-20 11:51:01,461 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950001250] [2020-07-20 11:51:01,462 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-07-20 11:51:01,462 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:51:01,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-07-20 11:51:01,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=3738, Unknown=0, NotChecked=0, Total=4032 [2020-07-20 11:51:01,463 INFO L87 Difference]: Start difference. First operand 269 states and 296 transitions. Second operand 61 states. [2020-07-20 11:51:06,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:51:06,746 INFO L93 Difference]: Finished difference Result 281 states and 309 transitions. [2020-07-20 11:51:06,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2020-07-20 11:51:06,747 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 374 [2020-07-20 11:51:06,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:51:06,751 INFO L225 Difference]: With dead ends: 281 [2020-07-20 11:51:06,751 INFO L226 Difference]: Without dead ends: 279 [2020-07-20 11:51:06,752 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 321 SyntacticMatches, 3 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3055 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=558, Invalid=8184, Unknown=0, NotChecked=0, Total=8742 [2020-07-20 11:51:06,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2020-07-20 11:51:06,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 278. [2020-07-20 11:51:06,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 278 states. [2020-07-20 11:51:06,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 306 transitions. [2020-07-20 11:51:06,773 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 306 transitions. Word has length 374 [2020-07-20 11:51:06,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:51:06,773 INFO L479 AbstractCegarLoop]: Abstraction has 278 states and 306 transitions. [2020-07-20 11:51:06,774 INFO L480 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-07-20 11:51:06,774 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 306 transitions. [2020-07-20 11:51:06,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 388 [2020-07-20 11:51:06,776 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:51:06,776 INFO L422 BasicCegarLoop]: trace histogram [58, 57, 57, 29, 29, 29, 29, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:51:06,989 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:51:06,990 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:51:06,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:51:06,990 INFO L82 PathProgramCache]: Analyzing trace with hash -676662587, now seen corresponding path program 28 times [2020-07-20 11:51:06,991 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:51:06,991 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [79018442] [2020-07-20 11:51:06,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:51:07,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:51:07,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 730 conjuncts, 65 conjunts are in the unsatisfiable core [2020-07-20 11:51:07,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:51:09,256 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:51:09,574 INFO L134 CoverageAnalysis]: Checked inductivity of 8472 backedges. 114 proven. 1974 refuted. 0 times theorem prover too weak. 6384 trivial. 0 not checked. [2020-07-20 11:51:09,575 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:51:09,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:51:10,099 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [79018442] [2020-07-20 11:51:10,099 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:51:10,099 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63] total 63 [2020-07-20 11:51:10,100 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584061706] [2020-07-20 11:51:10,101 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2020-07-20 11:51:10,101 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:51:10,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2020-07-20 11:51:10,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=3986, Unknown=0, NotChecked=0, Total=4290 [2020-07-20 11:51:10,102 INFO L87 Difference]: Start difference. First operand 278 states and 306 transitions. Second operand 63 states. [2020-07-20 11:51:15,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:51:15,628 INFO L93 Difference]: Finished difference Result 290 states and 319 transitions. [2020-07-20 11:51:15,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2020-07-20 11:51:15,629 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 387 [2020-07-20 11:51:15,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:51:15,631 INFO L225 Difference]: With dead ends: 290 [2020-07-20 11:51:15,631 INFO L226 Difference]: Without dead ends: 288 [2020-07-20 11:51:15,632 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 332 SyntacticMatches, 3 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3266 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=577, Invalid=8735, Unknown=0, NotChecked=0, Total=9312 [2020-07-20 11:51:15,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2020-07-20 11:51:15,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 287. [2020-07-20 11:51:15,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 287 states. [2020-07-20 11:51:15,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 316 transitions. [2020-07-20 11:51:15,654 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 316 transitions. Word has length 387 [2020-07-20 11:51:15,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:51:15,654 INFO L479 AbstractCegarLoop]: Abstraction has 287 states and 316 transitions. [2020-07-20 11:51:15,654 INFO L480 AbstractCegarLoop]: Interpolant automaton has 63 states. [2020-07-20 11:51:15,655 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 316 transitions. [2020-07-20 11:51:15,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 401 [2020-07-20 11:51:15,670 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:51:15,670 INFO L422 BasicCegarLoop]: trace histogram [60, 59, 59, 30, 30, 30, 30, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:51:15,885 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:51:15,886 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:51:15,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:51:15,886 INFO L82 PathProgramCache]: Analyzing trace with hash 1314631437, now seen corresponding path program 29 times [2020-07-20 11:51:15,886 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:51:15,886 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2033923957] [2020-07-20 11:51:15,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:51:15,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:51:15,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 754 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-20 11:51:16,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:51:18,288 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:51:18,633 INFO L134 CoverageAnalysis]: Checked inductivity of 9079 backedges. 118 proven. 2117 refuted. 0 times theorem prover too weak. 6844 trivial. 0 not checked. [2020-07-20 11:51:18,633 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:51:18,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:51:19,224 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2033923957] [2020-07-20 11:51:19,225 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:51:19,225 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65] total 65 [2020-07-20 11:51:19,225 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739429412] [2020-07-20 11:51:19,226 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2020-07-20 11:51:19,226 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:51:19,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2020-07-20 11:51:19,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=4242, Unknown=0, NotChecked=0, Total=4556 [2020-07-20 11:51:19,227 INFO L87 Difference]: Start difference. First operand 287 states and 316 transitions. Second operand 65 states. [2020-07-20 11:51:25,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:51:25,617 INFO L93 Difference]: Finished difference Result 299 states and 329 transitions. [2020-07-20 11:51:25,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2020-07-20 11:51:25,618 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 400 [2020-07-20 11:51:25,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:51:25,621 INFO L225 Difference]: With dead ends: 299 [2020-07-20 11:51:25,621 INFO L226 Difference]: Without dead ends: 297 [2020-07-20 11:51:25,622 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 343 SyntacticMatches, 3 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3484 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=596, Invalid=9304, Unknown=0, NotChecked=0, Total=9900 [2020-07-20 11:51:25,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2020-07-20 11:51:25,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 296. [2020-07-20 11:51:25,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 296 states. [2020-07-20 11:51:25,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 326 transitions. [2020-07-20 11:51:25,645 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 326 transitions. Word has length 400 [2020-07-20 11:51:25,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:51:25,646 INFO L479 AbstractCegarLoop]: Abstraction has 296 states and 326 transitions. [2020-07-20 11:51:25,646 INFO L480 AbstractCegarLoop]: Interpolant automaton has 65 states. [2020-07-20 11:51:25,646 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 326 transitions. [2020-07-20 11:51:25,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 414 [2020-07-20 11:51:25,648 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:51:25,649 INFO L422 BasicCegarLoop]: trace histogram [62, 61, 61, 31, 31, 31, 31, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:51:25,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:51:25,863 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:51:25,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:51:25,864 INFO L82 PathProgramCache]: Analyzing trace with hash -1675810875, now seen corresponding path program 30 times [2020-07-20 11:51:25,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:51:25,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2124551054] [2020-07-20 11:51:25,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:51:25,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:51:25,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 778 conjuncts, 69 conjunts are in the unsatisfiable core [2020-07-20 11:51:25,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:51:28,689 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:51:29,044 INFO L134 CoverageAnalysis]: Checked inductivity of 9707 backedges. 122 proven. 2265 refuted. 0 times theorem prover too weak. 7320 trivial. 0 not checked. [2020-07-20 11:51:29,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:51:29,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:51:29,652 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2124551054] [2020-07-20 11:51:29,653 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:51:29,653 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67] total 67 [2020-07-20 11:51:29,653 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653126286] [2020-07-20 11:51:29,653 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2020-07-20 11:51:29,654 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:51:29,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2020-07-20 11:51:29,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=4506, Unknown=0, NotChecked=0, Total=4830 [2020-07-20 11:51:29,654 INFO L87 Difference]: Start difference. First operand 296 states and 326 transitions. Second operand 67 states. [2020-07-20 11:51:36,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:51:36,048 INFO L93 Difference]: Finished difference Result 308 states and 339 transitions. [2020-07-20 11:51:36,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2020-07-20 11:51:36,049 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 413 [2020-07-20 11:51:36,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:51:36,052 INFO L225 Difference]: With dead ends: 308 [2020-07-20 11:51:36,052 INFO L226 Difference]: Without dead ends: 306 [2020-07-20 11:51:36,053 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 354 SyntacticMatches, 3 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3709 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=615, Invalid=9891, Unknown=0, NotChecked=0, Total=10506 [2020-07-20 11:51:36,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2020-07-20 11:51:36,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 305. [2020-07-20 11:51:36,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 305 states. [2020-07-20 11:51:36,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 336 transitions. [2020-07-20 11:51:36,072 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 336 transitions. Word has length 413 [2020-07-20 11:51:36,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:51:36,073 INFO L479 AbstractCegarLoop]: Abstraction has 305 states and 336 transitions. [2020-07-20 11:51:36,073 INFO L480 AbstractCegarLoop]: Interpolant automaton has 67 states. [2020-07-20 11:51:36,073 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 336 transitions. [2020-07-20 11:51:36,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 427 [2020-07-20 11:51:36,075 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:51:36,075 INFO L422 BasicCegarLoop]: trace histogram [64, 63, 63, 32, 32, 32, 32, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:51:36,275 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:51:36,276 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:51:36,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:51:36,277 INFO L82 PathProgramCache]: Analyzing trace with hash -1108895219, now seen corresponding path program 31 times [2020-07-20 11:51:36,277 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:51:36,277 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1225861814] [2020-07-20 11:51:36,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:51:36,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:51:36,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 802 conjuncts, 71 conjunts are in the unsatisfiable core [2020-07-20 11:51:36,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:51:39,306 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:51:39,700 INFO L134 CoverageAnalysis]: Checked inductivity of 10356 backedges. 126 proven. 2418 refuted. 0 times theorem prover too weak. 7812 trivial. 0 not checked. [2020-07-20 11:51:39,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:51:39,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:51:40,376 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1225861814] [2020-07-20 11:51:40,376 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:51:40,376 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69] total 69 [2020-07-20 11:51:40,377 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219500313] [2020-07-20 11:51:40,377 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2020-07-20 11:51:40,378 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:51:40,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2020-07-20 11:51:40,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=334, Invalid=4778, Unknown=0, NotChecked=0, Total=5112 [2020-07-20 11:51:40,379 INFO L87 Difference]: Start difference. First operand 305 states and 336 transitions. Second operand 69 states. [2020-07-20 11:51:47,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:51:47,300 INFO L93 Difference]: Finished difference Result 317 states and 349 transitions. [2020-07-20 11:51:47,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2020-07-20 11:51:47,302 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 426 [2020-07-20 11:51:47,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:51:47,304 INFO L225 Difference]: With dead ends: 317 [2020-07-20 11:51:47,304 INFO L226 Difference]: Without dead ends: 315 [2020-07-20 11:51:47,305 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 472 GetRequests, 365 SyntacticMatches, 3 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3941 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=634, Invalid=10496, Unknown=0, NotChecked=0, Total=11130 [2020-07-20 11:51:47,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2020-07-20 11:51:47,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 314. [2020-07-20 11:51:47,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 314 states. [2020-07-20 11:51:47,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 314 states to 314 states and 346 transitions. [2020-07-20 11:51:47,327 INFO L78 Accepts]: Start accepts. Automaton has 314 states and 346 transitions. Word has length 426 [2020-07-20 11:51:47,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:51:47,327 INFO L479 AbstractCegarLoop]: Abstraction has 314 states and 346 transitions. [2020-07-20 11:51:47,328 INFO L480 AbstractCegarLoop]: Interpolant automaton has 69 states. [2020-07-20 11:51:47,328 INFO L276 IsEmpty]: Start isEmpty. Operand 314 states and 346 transitions. [2020-07-20 11:51:47,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 440 [2020-07-20 11:51:47,331 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:51:47,331 INFO L422 BasicCegarLoop]: trace histogram [66, 65, 65, 33, 33, 33, 33, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:51:47,544 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:51:47,545 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:51:47,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:51:47,545 INFO L82 PathProgramCache]: Analyzing trace with hash -1635312443, now seen corresponding path program 32 times [2020-07-20 11:51:47,545 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:51:47,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1223444684] [2020-07-20 11:51:47,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:51:47,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:51:47,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 826 conjuncts, 73 conjunts are in the unsatisfiable core [2020-07-20 11:51:47,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:51:50,564 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:51:50,962 INFO L134 CoverageAnalysis]: Checked inductivity of 11026 backedges. 130 proven. 2576 refuted. 0 times theorem prover too weak. 8320 trivial. 0 not checked. [2020-07-20 11:51:50,962 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:51:51,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:51:51,598 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1223444684] [2020-07-20 11:51:51,598 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:51:51,598 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71] total 71 [2020-07-20 11:51:51,599 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395729507] [2020-07-20 11:51:51,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2020-07-20 11:51:51,599 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:51:51,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2020-07-20 11:51:51,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=344, Invalid=5058, Unknown=0, NotChecked=0, Total=5402 [2020-07-20 11:51:51,600 INFO L87 Difference]: Start difference. First operand 314 states and 346 transitions. Second operand 71 states. [2020-07-20 11:52:00,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:52:00,006 INFO L93 Difference]: Finished difference Result 326 states and 359 transitions. [2020-07-20 11:52:00,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2020-07-20 11:52:00,008 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 439 [2020-07-20 11:52:00,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:52:00,011 INFO L225 Difference]: With dead ends: 326 [2020-07-20 11:52:00,011 INFO L226 Difference]: Without dead ends: 324 [2020-07-20 11:52:00,012 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 376 SyntacticMatches, 3 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4180 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=653, Invalid=11119, Unknown=0, NotChecked=0, Total=11772 [2020-07-20 11:52:00,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 324 states. [2020-07-20 11:52:00,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 324 to 323. [2020-07-20 11:52:00,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 323 states. [2020-07-20 11:52:00,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 356 transitions. [2020-07-20 11:52:00,037 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 356 transitions. Word has length 439 [2020-07-20 11:52:00,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:52:00,038 INFO L479 AbstractCegarLoop]: Abstraction has 323 states and 356 transitions. [2020-07-20 11:52:00,038 INFO L480 AbstractCegarLoop]: Interpolant automaton has 71 states. [2020-07-20 11:52:00,038 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 356 transitions. [2020-07-20 11:52:00,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 453 [2020-07-20 11:52:00,041 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:52:00,041 INFO L422 BasicCegarLoop]: trace histogram [68, 67, 67, 34, 34, 34, 34, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:52:00,254 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:52:00,255 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:52:00,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:52:00,255 INFO L82 PathProgramCache]: Analyzing trace with hash -267139827, now seen corresponding path program 33 times [2020-07-20 11:52:00,255 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:52:00,255 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [817727548] [2020-07-20 11:52:00,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:52:00,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:52:00,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 850 conjuncts, 75 conjunts are in the unsatisfiable core [2020-07-20 11:52:00,381 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:52:03,661 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:52:04,097 INFO L134 CoverageAnalysis]: Checked inductivity of 11717 backedges. 134 proven. 2739 refuted. 0 times theorem prover too weak. 8844 trivial. 0 not checked. [2020-07-20 11:52:04,097 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:52:04,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:52:04,812 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [817727548] [2020-07-20 11:52:04,812 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:52:04,813 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73] total 73 [2020-07-20 11:52:04,813 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921068829] [2020-07-20 11:52:04,813 INFO L459 AbstractCegarLoop]: Interpolant automaton has 73 states [2020-07-20 11:52:04,814 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:52:04,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2020-07-20 11:52:04,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=354, Invalid=5346, Unknown=0, NotChecked=0, Total=5700 [2020-07-20 11:52:04,814 INFO L87 Difference]: Start difference. First operand 323 states and 356 transitions. Second operand 73 states. [2020-07-20 11:52:13,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:52:13,484 INFO L93 Difference]: Finished difference Result 335 states and 369 transitions. [2020-07-20 11:52:13,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2020-07-20 11:52:13,486 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 452 [2020-07-20 11:52:13,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:52:13,487 INFO L225 Difference]: With dead ends: 335 [2020-07-20 11:52:13,488 INFO L226 Difference]: Without dead ends: 333 [2020-07-20 11:52:13,489 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 387 SyntacticMatches, 3 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4426 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=672, Invalid=11760, Unknown=0, NotChecked=0, Total=12432 [2020-07-20 11:52:13,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2020-07-20 11:52:13,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 332. [2020-07-20 11:52:13,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 332 states. [2020-07-20 11:52:13,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 366 transitions. [2020-07-20 11:52:13,516 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 366 transitions. Word has length 452 [2020-07-20 11:52:13,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:52:13,516 INFO L479 AbstractCegarLoop]: Abstraction has 332 states and 366 transitions. [2020-07-20 11:52:13,516 INFO L480 AbstractCegarLoop]: Interpolant automaton has 73 states. [2020-07-20 11:52:13,517 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 366 transitions. [2020-07-20 11:52:13,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 466 [2020-07-20 11:52:13,520 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:52:13,520 INFO L422 BasicCegarLoop]: trace histogram [70, 69, 69, 35, 35, 35, 35, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:52:13,734 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:52:13,735 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:52:13,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:52:13,736 INFO L82 PathProgramCache]: Analyzing trace with hash -1799827003, now seen corresponding path program 34 times [2020-07-20 11:52:13,736 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:52:13,736 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1237459708] [2020-07-20 11:52:13,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:52:13,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:52:13,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 874 conjuncts, 77 conjunts are in the unsatisfiable core [2020-07-20 11:52:13,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:52:17,557 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:52:18,060 INFO L134 CoverageAnalysis]: Checked inductivity of 12429 backedges. 138 proven. 2907 refuted. 0 times theorem prover too weak. 9384 trivial. 0 not checked. [2020-07-20 11:52:18,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:52:18,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:52:18,855 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1237459708] [2020-07-20 11:52:18,856 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:52:18,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75] total 75 [2020-07-20 11:52:18,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601671752] [2020-07-20 11:52:18,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2020-07-20 11:52:18,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:52:18,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2020-07-20 11:52:18,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=5642, Unknown=0, NotChecked=0, Total=6006 [2020-07-20 11:52:18,857 INFO L87 Difference]: Start difference. First operand 332 states and 366 transitions. Second operand 75 states. [2020-07-20 11:52:28,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:52:28,789 INFO L93 Difference]: Finished difference Result 344 states and 379 transitions. [2020-07-20 11:52:28,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2020-07-20 11:52:28,791 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 465 [2020-07-20 11:52:28,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:52:28,794 INFO L225 Difference]: With dead ends: 344 [2020-07-20 11:52:28,794 INFO L226 Difference]: Without dead ends: 342 [2020-07-20 11:52:28,796 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 398 SyntacticMatches, 3 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4679 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=691, Invalid=12419, Unknown=0, NotChecked=0, Total=13110 [2020-07-20 11:52:28,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2020-07-20 11:52:28,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 341. [2020-07-20 11:52:28,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 341 states. [2020-07-20 11:52:28,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 376 transitions. [2020-07-20 11:52:28,837 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 376 transitions. Word has length 465 [2020-07-20 11:52:28,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:52:28,838 INFO L479 AbstractCegarLoop]: Abstraction has 341 states and 376 transitions. [2020-07-20 11:52:28,838 INFO L480 AbstractCegarLoop]: Interpolant automaton has 75 states. [2020-07-20 11:52:28,838 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 376 transitions. [2020-07-20 11:52:28,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 479 [2020-07-20 11:52:28,841 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:52:28,841 INFO L422 BasicCegarLoop]: trace histogram [72, 71, 71, 36, 36, 36, 36, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:52:29,048 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:52:29,049 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:52:29,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:52:29,050 INFO L82 PathProgramCache]: Analyzing trace with hash 554709005, now seen corresponding path program 35 times [2020-07-20 11:52:29,050 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:52:29,050 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1329132921] [2020-07-20 11:52:29,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:52:29,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:52:29,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 898 conjuncts, 79 conjunts are in the unsatisfiable core [2020-07-20 11:52:29,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:52:33,106 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:52:33,595 INFO L134 CoverageAnalysis]: Checked inductivity of 13162 backedges. 142 proven. 3080 refuted. 0 times theorem prover too weak. 9940 trivial. 0 not checked. [2020-07-20 11:52:33,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:52:33,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:52:34,404 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1329132921] [2020-07-20 11:52:34,405 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:52:34,405 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [77] total 77 [2020-07-20 11:52:34,405 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1987584828] [2020-07-20 11:52:34,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2020-07-20 11:52:34,406 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:52:34,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2020-07-20 11:52:34,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=374, Invalid=5946, Unknown=0, NotChecked=0, Total=6320 [2020-07-20 11:52:34,408 INFO L87 Difference]: Start difference. First operand 341 states and 376 transitions. Second operand 77 states. [2020-07-20 11:52:45,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:52:45,407 INFO L93 Difference]: Finished difference Result 353 states and 389 transitions. [2020-07-20 11:52:45,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2020-07-20 11:52:45,408 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 478 [2020-07-20 11:52:45,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:52:45,411 INFO L225 Difference]: With dead ends: 353 [2020-07-20 11:52:45,411 INFO L226 Difference]: Without dead ends: 351 [2020-07-20 11:52:45,413 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 528 GetRequests, 409 SyntacticMatches, 3 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4939 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=710, Invalid=13096, Unknown=0, NotChecked=0, Total=13806 [2020-07-20 11:52:45,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 351 states. [2020-07-20 11:52:45,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 351 to 350. [2020-07-20 11:52:45,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 350 states. [2020-07-20 11:52:45,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 386 transitions. [2020-07-20 11:52:45,442 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 386 transitions. Word has length 478 [2020-07-20 11:52:45,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:52:45,443 INFO L479 AbstractCegarLoop]: Abstraction has 350 states and 386 transitions. [2020-07-20 11:52:45,443 INFO L480 AbstractCegarLoop]: Interpolant automaton has 77 states. [2020-07-20 11:52:45,443 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 386 transitions. [2020-07-20 11:52:45,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 492 [2020-07-20 11:52:45,446 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:52:45,446 INFO L422 BasicCegarLoop]: trace histogram [74, 73, 73, 37, 37, 37, 37, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:52:45,661 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:52:45,662 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:52:45,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:52:45,663 INFO L82 PathProgramCache]: Analyzing trace with hash -1870510395, now seen corresponding path program 36 times [2020-07-20 11:52:45,663 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:52:45,663 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [694337077] [2020-07-20 11:52:45,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:52:45,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:52:45,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 922 conjuncts, 81 conjunts are in the unsatisfiable core [2020-07-20 11:52:45,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:52:50,035 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:52:50,561 INFO L134 CoverageAnalysis]: Checked inductivity of 13916 backedges. 146 proven. 3258 refuted. 0 times theorem prover too weak. 10512 trivial. 0 not checked. [2020-07-20 11:52:50,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:52:50,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:52:51,428 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [694337077] [2020-07-20 11:52:51,429 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:52:51,429 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [79] total 79 [2020-07-20 11:52:51,429 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210285686] [2020-07-20 11:52:51,430 INFO L459 AbstractCegarLoop]: Interpolant automaton has 79 states [2020-07-20 11:52:51,430 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:52:51,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2020-07-20 11:52:51,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=6258, Unknown=0, NotChecked=0, Total=6642 [2020-07-20 11:52:51,431 INFO L87 Difference]: Start difference. First operand 350 states and 386 transitions. Second operand 79 states. [2020-07-20 11:53:03,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:03,608 INFO L93 Difference]: Finished difference Result 362 states and 399 transitions. [2020-07-20 11:53:03,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2020-07-20 11:53:03,610 INFO L78 Accepts]: Start accepts. Automaton has 79 states. Word has length 491 [2020-07-20 11:53:03,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:03,613 INFO L225 Difference]: With dead ends: 362 [2020-07-20 11:53:03,613 INFO L226 Difference]: Without dead ends: 360 [2020-07-20 11:53:03,615 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 542 GetRequests, 420 SyntacticMatches, 3 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5206 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=729, Invalid=13791, Unknown=0, NotChecked=0, Total=14520 [2020-07-20 11:53:03,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2020-07-20 11:53:03,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 359. [2020-07-20 11:53:03,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 359 states. [2020-07-20 11:53:03,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 359 states to 359 states and 396 transitions. [2020-07-20 11:53:03,638 INFO L78 Accepts]: Start accepts. Automaton has 359 states and 396 transitions. Word has length 491 [2020-07-20 11:53:03,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:03,639 INFO L479 AbstractCegarLoop]: Abstraction has 359 states and 396 transitions. [2020-07-20 11:53:03,639 INFO L480 AbstractCegarLoop]: Interpolant automaton has 79 states. [2020-07-20 11:53:03,639 INFO L276 IsEmpty]: Start isEmpty. Operand 359 states and 396 transitions. [2020-07-20 11:53:03,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-20 11:53:03,642 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:03,643 INFO L422 BasicCegarLoop]: trace histogram [76, 75, 75, 38, 38, 38, 38, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:03,855 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:03,856 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:03,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:03,856 INFO L82 PathProgramCache]: Analyzing trace with hash -1324557555, now seen corresponding path program 37 times [2020-07-20 11:53:03,856 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:03,856 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1009501973] [2020-07-20 11:53:03,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:03,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:03,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 946 conjuncts, 83 conjunts are in the unsatisfiable core [2020-07-20 11:53:04,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:08,688 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:53:09,241 INFO L134 CoverageAnalysis]: Checked inductivity of 14691 backedges. 150 proven. 3441 refuted. 0 times theorem prover too weak. 11100 trivial. 0 not checked. [2020-07-20 11:53:09,241 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:09,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:53:10,301 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1009501973] [2020-07-20 11:53:10,301 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:53:10,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [81] total 81 [2020-07-20 11:53:10,302 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060806647] [2020-07-20 11:53:10,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 81 states [2020-07-20 11:53:10,302 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:10,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2020-07-20 11:53:10,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=394, Invalid=6578, Unknown=0, NotChecked=0, Total=6972 [2020-07-20 11:53:10,303 INFO L87 Difference]: Start difference. First operand 359 states and 396 transitions. Second operand 81 states. [2020-07-20 11:53:25,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:25,465 INFO L93 Difference]: Finished difference Result 371 states and 409 transitions. [2020-07-20 11:53:25,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2020-07-20 11:53:25,467 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 504 [2020-07-20 11:53:25,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:25,470 INFO L225 Difference]: With dead ends: 371 [2020-07-20 11:53:25,470 INFO L226 Difference]: Without dead ends: 369 [2020-07-20 11:53:25,471 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 556 GetRequests, 431 SyntacticMatches, 3 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5480 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=748, Invalid=14504, Unknown=0, NotChecked=0, Total=15252 [2020-07-20 11:53:25,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2020-07-20 11:53:25,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 368. [2020-07-20 11:53:25,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2020-07-20 11:53:25,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 406 transitions. [2020-07-20 11:53:25,502 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 406 transitions. Word has length 504 [2020-07-20 11:53:25,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:25,503 INFO L479 AbstractCegarLoop]: Abstraction has 368 states and 406 transitions. [2020-07-20 11:53:25,503 INFO L480 AbstractCegarLoop]: Interpolant automaton has 81 states. [2020-07-20 11:53:25,503 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 406 transitions. [2020-07-20 11:53:25,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 518 [2020-07-20 11:53:25,506 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:25,507 INFO L422 BasicCegarLoop]: trace histogram [78, 77, 77, 39, 39, 39, 39, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:25,719 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:25,720 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:25,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:25,721 INFO L82 PathProgramCache]: Analyzing trace with hash -5014587, now seen corresponding path program 38 times [2020-07-20 11:53:25,721 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:25,721 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1223678923] [2020-07-20 11:53:25,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:25,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:25,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 970 conjuncts, 85 conjunts are in the unsatisfiable core [2020-07-20 11:53:25,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:31,353 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:53:31,948 INFO L134 CoverageAnalysis]: Checked inductivity of 15487 backedges. 154 proven. 3629 refuted. 0 times theorem prover too weak. 11704 trivial. 0 not checked. [2020-07-20 11:53:31,949 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:32,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:53:32,968 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1223678923] [2020-07-20 11:53:32,968 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:53:32,969 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83] total 83 [2020-07-20 11:53:32,969 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077912889] [2020-07-20 11:53:32,969 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2020-07-20 11:53:32,970 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:32,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2020-07-20 11:53:32,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=6906, Unknown=0, NotChecked=0, Total=7310 [2020-07-20 11:53:32,971 INFO L87 Difference]: Start difference. First operand 368 states and 406 transitions. Second operand 83 states. [2020-07-20 11:53:48,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:53:48,456 INFO L93 Difference]: Finished difference Result 380 states and 419 transitions. [2020-07-20 11:53:48,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2020-07-20 11:53:48,458 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 517 [2020-07-20 11:53:48,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:53:48,461 INFO L225 Difference]: With dead ends: 380 [2020-07-20 11:53:48,462 INFO L226 Difference]: Without dead ends: 378 [2020-07-20 11:53:48,462 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 570 GetRequests, 442 SyntacticMatches, 3 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5761 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=767, Invalid=15235, Unknown=0, NotChecked=0, Total=16002 [2020-07-20 11:53:48,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2020-07-20 11:53:48,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 377. [2020-07-20 11:53:48,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 377 states. [2020-07-20 11:53:48,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 416 transitions. [2020-07-20 11:53:48,490 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 416 transitions. Word has length 517 [2020-07-20 11:53:48,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:53:48,490 INFO L479 AbstractCegarLoop]: Abstraction has 377 states and 416 transitions. [2020-07-20 11:53:48,490 INFO L480 AbstractCegarLoop]: Interpolant automaton has 83 states. [2020-07-20 11:53:48,491 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 416 transitions. [2020-07-20 11:53:48,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 531 [2020-07-20 11:53:48,493 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:53:48,494 INFO L422 BasicCegarLoop]: trace histogram [80, 79, 79, 40, 40, 40, 40, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:53:48,694 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:48,695 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:53:48,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:53:48,696 INFO L82 PathProgramCache]: Analyzing trace with hash 607766029, now seen corresponding path program 39 times [2020-07-20 11:53:48,696 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:53:48,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2015801724] [2020-07-20 11:53:48,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:53:48,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:53:48,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 994 conjuncts, 87 conjunts are in the unsatisfiable core [2020-07-20 11:53:48,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:53:54,677 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:53:55,309 INFO L134 CoverageAnalysis]: Checked inductivity of 16304 backedges. 158 proven. 3822 refuted. 0 times theorem prover too weak. 12324 trivial. 0 not checked. [2020-07-20 11:53:55,309 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:53:55,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:53:56,382 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2015801724] [2020-07-20 11:53:56,383 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:53:56,383 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [85] total 85 [2020-07-20 11:53:56,383 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098573290] [2020-07-20 11:53:56,384 INFO L459 AbstractCegarLoop]: Interpolant automaton has 85 states [2020-07-20 11:53:56,384 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:53:56,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2020-07-20 11:53:56,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=414, Invalid=7242, Unknown=0, NotChecked=0, Total=7656 [2020-07-20 11:53:56,385 INFO L87 Difference]: Start difference. First operand 377 states and 416 transitions. Second operand 85 states. [2020-07-20 11:54:16,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:54:16,703 INFO L93 Difference]: Finished difference Result 389 states and 429 transitions. [2020-07-20 11:54:16,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2020-07-20 11:54:16,706 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 530 [2020-07-20 11:54:16,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:54:16,709 INFO L225 Difference]: With dead ends: 389 [2020-07-20 11:54:16,709 INFO L226 Difference]: Without dead ends: 387 [2020-07-20 11:54:16,710 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 584 GetRequests, 453 SyntacticMatches, 3 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6049 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=786, Invalid=15984, Unknown=0, NotChecked=0, Total=16770 [2020-07-20 11:54:16,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2020-07-20 11:54:16,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 386. [2020-07-20 11:54:16,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 386 states. [2020-07-20 11:54:16,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 386 states to 386 states and 426 transitions. [2020-07-20 11:54:16,737 INFO L78 Accepts]: Start accepts. Automaton has 386 states and 426 transitions. Word has length 530 [2020-07-20 11:54:16,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:54:16,738 INFO L479 AbstractCegarLoop]: Abstraction has 386 states and 426 transitions. [2020-07-20 11:54:16,738 INFO L480 AbstractCegarLoop]: Interpolant automaton has 85 states. [2020-07-20 11:54:16,738 INFO L276 IsEmpty]: Start isEmpty. Operand 386 states and 426 transitions. [2020-07-20 11:54:16,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 544 [2020-07-20 11:54:16,741 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:54:16,741 INFO L422 BasicCegarLoop]: trace histogram [82, 81, 81, 41, 41, 41, 41, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:54:16,942 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:16,942 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:54:16,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:54:16,943 INFO L82 PathProgramCache]: Analyzing trace with hash -1407422267, now seen corresponding path program 40 times [2020-07-20 11:54:16,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:54:16,943 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1303694157] [2020-07-20 11:54:16,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:17,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:54:17,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 1018 conjuncts, 89 conjunts are in the unsatisfiable core [2020-07-20 11:54:17,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:54:23,533 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:54:24,199 INFO L134 CoverageAnalysis]: Checked inductivity of 17142 backedges. 162 proven. 4020 refuted. 0 times theorem prover too weak. 12960 trivial. 0 not checked. [2020-07-20 11:54:24,199 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:54:24,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:54:25,404 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1303694157] [2020-07-20 11:54:25,404 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:54:25,405 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [87] total 87 [2020-07-20 11:54:25,405 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203846837] [2020-07-20 11:54:25,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 87 states [2020-07-20 11:54:25,406 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:54:25,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2020-07-20 11:54:25,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=424, Invalid=7586, Unknown=0, NotChecked=0, Total=8010 [2020-07-20 11:54:25,407 INFO L87 Difference]: Start difference. First operand 386 states and 426 transitions. Second operand 87 states. [2020-07-20 11:54:45,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:54:45,534 INFO L93 Difference]: Finished difference Result 398 states and 439 transitions. [2020-07-20 11:54:45,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2020-07-20 11:54:45,537 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 543 [2020-07-20 11:54:45,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:54:45,539 INFO L225 Difference]: With dead ends: 398 [2020-07-20 11:54:45,539 INFO L226 Difference]: Without dead ends: 396 [2020-07-20 11:54:45,540 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 598 GetRequests, 464 SyntacticMatches, 3 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6344 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=805, Invalid=16751, Unknown=0, NotChecked=0, Total=17556 [2020-07-20 11:54:45,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 396 states. [2020-07-20 11:54:45,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 396 to 395. [2020-07-20 11:54:45,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 395 states. [2020-07-20 11:54:45,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 436 transitions. [2020-07-20 11:54:45,565 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 436 transitions. Word has length 543 [2020-07-20 11:54:45,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:54:45,566 INFO L479 AbstractCegarLoop]: Abstraction has 395 states and 436 transitions. [2020-07-20 11:54:45,566 INFO L480 AbstractCegarLoop]: Interpolant automaton has 87 states. [2020-07-20 11:54:45,566 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 436 transitions. [2020-07-20 11:54:45,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 557 [2020-07-20 11:54:45,570 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:54:45,570 INFO L422 BasicCegarLoop]: trace histogram [84, 83, 83, 42, 42, 42, 42, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:54:45,784 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:45,785 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:54:45,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:54:45,785 INFO L82 PathProgramCache]: Analyzing trace with hash 583463181, now seen corresponding path program 41 times [2020-07-20 11:54:45,785 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:54:45,785 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [967014067] [2020-07-20 11:54:45,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:54:45,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:54:45,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 1042 conjuncts, 91 conjunts are in the unsatisfiable core [2020-07-20 11:54:45,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:54:52,847 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:54:53,590 INFO L134 CoverageAnalysis]: Checked inductivity of 18001 backedges. 166 proven. 4223 refuted. 0 times theorem prover too weak. 13612 trivial. 0 not checked. [2020-07-20 11:54:53,590 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:54:53,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:54:54,870 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [967014067] [2020-07-20 11:54:54,870 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:54:54,871 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [89] total 89 [2020-07-20 11:54:54,871 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113189802] [2020-07-20 11:54:54,872 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2020-07-20 11:54:54,872 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:54:54,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2020-07-20 11:54:54,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=434, Invalid=7938, Unknown=0, NotChecked=0, Total=8372 [2020-07-20 11:54:54,873 INFO L87 Difference]: Start difference. First operand 395 states and 436 transitions. Second operand 89 states. [2020-07-20 11:55:18,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:55:18,613 INFO L93 Difference]: Finished difference Result 407 states and 449 transitions. [2020-07-20 11:55:18,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2020-07-20 11:55:18,615 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 556 [2020-07-20 11:55:18,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:55:18,619 INFO L225 Difference]: With dead ends: 407 [2020-07-20 11:55:18,619 INFO L226 Difference]: Without dead ends: 405 [2020-07-20 11:55:18,620 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 612 GetRequests, 475 SyntacticMatches, 3 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6646 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=824, Invalid=17536, Unknown=0, NotChecked=0, Total=18360 [2020-07-20 11:55:18,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 405 states. [2020-07-20 11:55:18,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 405 to 404. [2020-07-20 11:55:18,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 404 states. [2020-07-20 11:55:18,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 404 states to 404 states and 446 transitions. [2020-07-20 11:55:18,652 INFO L78 Accepts]: Start accepts. Automaton has 404 states and 446 transitions. Word has length 556 [2020-07-20 11:55:18,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:55:18,653 INFO L479 AbstractCegarLoop]: Abstraction has 404 states and 446 transitions. [2020-07-20 11:55:18,653 INFO L480 AbstractCegarLoop]: Interpolant automaton has 89 states. [2020-07-20 11:55:18,653 INFO L276 IsEmpty]: Start isEmpty. Operand 404 states and 446 transitions. [2020-07-20 11:55:18,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 570 [2020-07-20 11:55:18,657 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:55:18,657 INFO L422 BasicCegarLoop]: trace histogram [86, 85, 85, 43, 43, 43, 43, 42, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:55:18,858 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:55:18,858 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:55:18,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:55:18,859 INFO L82 PathProgramCache]: Analyzing trace with hash -1148377659, now seen corresponding path program 42 times [2020-07-20 11:55:18,859 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:55:18,859 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2115916859] [2020-07-20 11:55:18,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:55:19,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:55:19,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 1066 conjuncts, 93 conjunts are in the unsatisfiable core [2020-07-20 11:55:19,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:55:26,529 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:55:27,308 INFO L134 CoverageAnalysis]: Checked inductivity of 18881 backedges. 170 proven. 4431 refuted. 0 times theorem prover too weak. 14280 trivial. 0 not checked. [2020-07-20 11:55:27,309 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:55:27,669 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:55:28,744 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2115916859] [2020-07-20 11:55:28,744 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:55:28,744 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [91] total 91 [2020-07-20 11:55:28,745 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738242325] [2020-07-20 11:55:28,745 INFO L459 AbstractCegarLoop]: Interpolant automaton has 91 states [2020-07-20 11:55:28,746 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:55:28,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2020-07-20 11:55:28,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=444, Invalid=8298, Unknown=0, NotChecked=0, Total=8742 [2020-07-20 11:55:28,747 INFO L87 Difference]: Start difference. First operand 404 states and 446 transitions. Second operand 91 states. [2020-07-20 11:55:54,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:55:54,439 INFO L93 Difference]: Finished difference Result 416 states and 459 transitions. [2020-07-20 11:55:54,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2020-07-20 11:55:54,442 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 569 [2020-07-20 11:55:54,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:55:54,445 INFO L225 Difference]: With dead ends: 416 [2020-07-20 11:55:54,445 INFO L226 Difference]: Without dead ends: 414 [2020-07-20 11:55:54,446 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 626 GetRequests, 486 SyntacticMatches, 3 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6955 ImplicationChecksByTransitivity, 13.9s TimeCoverageRelationStatistics Valid=843, Invalid=18339, Unknown=0, NotChecked=0, Total=19182 [2020-07-20 11:55:54,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 414 states. [2020-07-20 11:55:54,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 414 to 413. [2020-07-20 11:55:54,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 413 states. [2020-07-20 11:55:54,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 456 transitions. [2020-07-20 11:55:54,490 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 456 transitions. Word has length 569 [2020-07-20 11:55:54,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:55:54,490 INFO L479 AbstractCegarLoop]: Abstraction has 413 states and 456 transitions. [2020-07-20 11:55:54,490 INFO L480 AbstractCegarLoop]: Interpolant automaton has 91 states. [2020-07-20 11:55:54,490 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 456 transitions. [2020-07-20 11:55:54,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 583 [2020-07-20 11:55:54,493 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:55:54,494 INFO L422 BasicCegarLoop]: trace histogram [88, 87, 87, 44, 44, 44, 44, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:55:54,694 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:55:54,694 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:55:54,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:55:54,695 INFO L82 PathProgramCache]: Analyzing trace with hash 2028231693, now seen corresponding path program 43 times [2020-07-20 11:55:54,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:55:54,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [326744445] [2020-07-20 11:55:54,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:55:54,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:55:54,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 1090 conjuncts, 95 conjunts are in the unsatisfiable core [2020-07-20 11:55:54,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:56:03,242 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:56:04,060 INFO L134 CoverageAnalysis]: Checked inductivity of 19782 backedges. 174 proven. 4644 refuted. 0 times theorem prover too weak. 14964 trivial. 0 not checked. [2020-07-20 11:56:04,061 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:56:04,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:56:05,574 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [326744445] [2020-07-20 11:56:05,574 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:56:05,574 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [93] total 93 [2020-07-20 11:56:05,575 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [351461414] [2020-07-20 11:56:05,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 93 states [2020-07-20 11:56:05,576 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:56:05,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2020-07-20 11:56:05,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=454, Invalid=8666, Unknown=0, NotChecked=0, Total=9120 [2020-07-20 11:56:05,577 INFO L87 Difference]: Start difference. First operand 413 states and 456 transitions. Second operand 93 states. [2020-07-20 11:56:35,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:56:35,922 INFO L93 Difference]: Finished difference Result 425 states and 469 transitions. [2020-07-20 11:56:35,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 136 states. [2020-07-20 11:56:35,925 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 582 [2020-07-20 11:56:35,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:56:35,929 INFO L225 Difference]: With dead ends: 425 [2020-07-20 11:56:35,929 INFO L226 Difference]: Without dead ends: 423 [2020-07-20 11:56:35,930 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 640 GetRequests, 497 SyntacticMatches, 3 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7271 ImplicationChecksByTransitivity, 15.5s TimeCoverageRelationStatistics Valid=862, Invalid=19160, Unknown=0, NotChecked=0, Total=20022 [2020-07-20 11:56:35,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 423 states. [2020-07-20 11:56:35,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 423 to 422. [2020-07-20 11:56:35,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 422 states. [2020-07-20 11:56:35,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 422 states to 422 states and 466 transitions. [2020-07-20 11:56:35,957 INFO L78 Accepts]: Start accepts. Automaton has 422 states and 466 transitions. Word has length 582 [2020-07-20 11:56:35,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:56:35,957 INFO L479 AbstractCegarLoop]: Abstraction has 422 states and 466 transitions. [2020-07-20 11:56:35,958 INFO L480 AbstractCegarLoop]: Interpolant automaton has 93 states. [2020-07-20 11:56:35,958 INFO L276 IsEmpty]: Start isEmpty. Operand 422 states and 466 transitions. [2020-07-20 11:56:35,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 596 [2020-07-20 11:56:35,962 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:56:35,962 INFO L422 BasicCegarLoop]: trace histogram [90, 89, 89, 45, 45, 45, 45, 44, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:56:36,163 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:56:36,163 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:56:36,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:56:36,164 INFO L82 PathProgramCache]: Analyzing trace with hash -1344955707, now seen corresponding path program 44 times [2020-07-20 11:56:36,164 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:56:36,164 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [412676040] [2020-07-20 11:56:36,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:56:36,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:56:36,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 1114 conjuncts, 97 conjunts are in the unsatisfiable core [2020-07-20 11:56:36,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:56:45,669 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:56:46,554 INFO L134 CoverageAnalysis]: Checked inductivity of 20704 backedges. 178 proven. 4862 refuted. 0 times theorem prover too weak. 15664 trivial. 0 not checked. [2020-07-20 11:56:46,555 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:56:46,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:56:48,180 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [412676040] [2020-07-20 11:56:48,180 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:56:48,181 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [95] total 95 [2020-07-20 11:56:48,181 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1717051822] [2020-07-20 11:56:48,182 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2020-07-20 11:56:48,182 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:56:48,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2020-07-20 11:56:48,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=464, Invalid=9042, Unknown=0, NotChecked=0, Total=9506 [2020-07-20 11:56:48,183 INFO L87 Difference]: Start difference. First operand 422 states and 466 transitions. Second operand 95 states. [2020-07-20 11:57:21,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:57:21,656 INFO L93 Difference]: Finished difference Result 434 states and 479 transitions. [2020-07-20 11:57:21,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2020-07-20 11:57:21,659 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 595 [2020-07-20 11:57:21,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:57:21,663 INFO L225 Difference]: With dead ends: 434 [2020-07-20 11:57:21,663 INFO L226 Difference]: Without dead ends: 432 [2020-07-20 11:57:21,664 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 654 GetRequests, 508 SyntacticMatches, 3 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7594 ImplicationChecksByTransitivity, 17.0s TimeCoverageRelationStatistics Valid=881, Invalid=19999, Unknown=0, NotChecked=0, Total=20880 [2020-07-20 11:57:21,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 432 states. [2020-07-20 11:57:21,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 432 to 431. [2020-07-20 11:57:21,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 431 states. [2020-07-20 11:57:21,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 431 states to 431 states and 476 transitions. [2020-07-20 11:57:21,704 INFO L78 Accepts]: Start accepts. Automaton has 431 states and 476 transitions. Word has length 595 [2020-07-20 11:57:21,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:57:21,704 INFO L479 AbstractCegarLoop]: Abstraction has 431 states and 476 transitions. [2020-07-20 11:57:21,704 INFO L480 AbstractCegarLoop]: Interpolant automaton has 95 states. [2020-07-20 11:57:21,705 INFO L276 IsEmpty]: Start isEmpty. Operand 431 states and 476 transitions. [2020-07-20 11:57:21,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 609 [2020-07-20 11:57:21,709 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:57:21,709 INFO L422 BasicCegarLoop]: trace histogram [92, 91, 91, 46, 46, 46, 46, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:57:21,923 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:57:21,924 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:57:21,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:57:21,925 INFO L82 PathProgramCache]: Analyzing trace with hash 381814541, now seen corresponding path program 45 times [2020-07-20 11:57:21,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:57:21,925 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [528034487] [2020-07-20 11:57:21,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:57:22,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:57:22,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 1138 conjuncts, 99 conjunts are in the unsatisfiable core [2020-07-20 11:57:22,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:57:32,324 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:57:33,224 INFO L134 CoverageAnalysis]: Checked inductivity of 21647 backedges. 182 proven. 5085 refuted. 0 times theorem prover too weak. 16380 trivial. 0 not checked. [2020-07-20 11:57:33,224 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:57:33,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:57:35,047 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [528034487] [2020-07-20 11:57:35,047 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:57:35,047 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97] total 97 [2020-07-20 11:57:35,048 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1175908125] [2020-07-20 11:57:35,048 INFO L459 AbstractCegarLoop]: Interpolant automaton has 97 states [2020-07-20 11:57:35,049 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:57:35,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2020-07-20 11:57:35,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=474, Invalid=9426, Unknown=0, NotChecked=0, Total=9900 [2020-07-20 11:57:35,049 INFO L87 Difference]: Start difference. First operand 431 states and 476 transitions. Second operand 97 states. [2020-07-20 11:58:11,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:58:11,409 INFO L93 Difference]: Finished difference Result 443 states and 489 transitions. [2020-07-20 11:58:11,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2020-07-20 11:58:11,413 INFO L78 Accepts]: Start accepts. Automaton has 97 states. Word has length 608 [2020-07-20 11:58:11,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:58:11,416 INFO L225 Difference]: With dead ends: 443 [2020-07-20 11:58:11,416 INFO L226 Difference]: Without dead ends: 441 [2020-07-20 11:58:11,417 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 668 GetRequests, 519 SyntacticMatches, 3 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7924 ImplicationChecksByTransitivity, 18.3s TimeCoverageRelationStatistics Valid=900, Invalid=20856, Unknown=0, NotChecked=0, Total=21756 [2020-07-20 11:58:11,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2020-07-20 11:58:11,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 440. [2020-07-20 11:58:11,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 440 states. [2020-07-20 11:58:11,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 440 states to 440 states and 486 transitions. [2020-07-20 11:58:11,457 INFO L78 Accepts]: Start accepts. Automaton has 440 states and 486 transitions. Word has length 608 [2020-07-20 11:58:11,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:58:11,458 INFO L479 AbstractCegarLoop]: Abstraction has 440 states and 486 transitions. [2020-07-20 11:58:11,458 INFO L480 AbstractCegarLoop]: Interpolant automaton has 97 states. [2020-07-20 11:58:11,458 INFO L276 IsEmpty]: Start isEmpty. Operand 440 states and 486 transitions. [2020-07-20 11:58:11,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 622 [2020-07-20 11:58:11,461 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:58:11,461 INFO L422 BasicCegarLoop]: trace histogram [94, 93, 93, 47, 47, 47, 47, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:58:11,662 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:58:11,662 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:58:11,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:58:11,663 INFO L82 PathProgramCache]: Analyzing trace with hash 1724239813, now seen corresponding path program 46 times [2020-07-20 11:58:11,663 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:58:11,663 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [204621244] [2020-07-20 11:58:11,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:58:11,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:58:11,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 1162 conjuncts, 101 conjunts are in the unsatisfiable core [2020-07-20 11:58:11,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:58:22,703 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:58:23,681 INFO L134 CoverageAnalysis]: Checked inductivity of 22611 backedges. 186 proven. 5313 refuted. 0 times theorem prover too weak. 17112 trivial. 0 not checked. [2020-07-20 11:58:23,681 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:58:24,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:58:25,545 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [204621244] [2020-07-20 11:58:25,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:58:25,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [99] total 99 [2020-07-20 11:58:25,546 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1577698352] [2020-07-20 11:58:25,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 99 states [2020-07-20 11:58:25,547 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:58:25,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2020-07-20 11:58:25,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=484, Invalid=9818, Unknown=0, NotChecked=0, Total=10302 [2020-07-20 11:58:25,552 INFO L87 Difference]: Start difference. First operand 440 states and 486 transitions. Second operand 99 states. [2020-07-20 11:59:05,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:59:05,067 INFO L93 Difference]: Finished difference Result 452 states and 499 transitions. [2020-07-20 11:59:05,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 145 states. [2020-07-20 11:59:05,072 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 621 [2020-07-20 11:59:05,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:59:05,075 INFO L225 Difference]: With dead ends: 452 [2020-07-20 11:59:05,075 INFO L226 Difference]: Without dead ends: 450 [2020-07-20 11:59:05,077 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 530 SyntacticMatches, 3 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8261 ImplicationChecksByTransitivity, 19.8s TimeCoverageRelationStatistics Valid=919, Invalid=21731, Unknown=0, NotChecked=0, Total=22650 [2020-07-20 11:59:05,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 450 states. [2020-07-20 11:59:05,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 450 to 449. [2020-07-20 11:59:05,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 449 states. [2020-07-20 11:59:05,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 496 transitions. [2020-07-20 11:59:05,120 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 496 transitions. Word has length 621 [2020-07-20 11:59:05,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:59:05,122 INFO L479 AbstractCegarLoop]: Abstraction has 449 states and 496 transitions. [2020-07-20 11:59:05,122 INFO L480 AbstractCegarLoop]: Interpolant automaton has 99 states. [2020-07-20 11:59:05,122 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 496 transitions. [2020-07-20 11:59:05,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 635 [2020-07-20 11:59:05,127 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:59:05,127 INFO L422 BasicCegarLoop]: trace histogram [96, 95, 95, 48, 48, 48, 48, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:59:05,341 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:59:05,342 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:59:05,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:59:05,342 INFO L82 PathProgramCache]: Analyzing trace with hash 277869069, now seen corresponding path program 47 times [2020-07-20 11:59:05,342 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:59:05,342 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1697583780] [2020-07-20 11:59:05,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:59:05,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:59:05,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 1186 conjuncts, 103 conjunts are in the unsatisfiable core [2020-07-20 11:59:05,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:59:17,419 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:59:18,456 INFO L134 CoverageAnalysis]: Checked inductivity of 23596 backedges. 190 proven. 5546 refuted. 0 times theorem prover too weak. 17860 trivial. 0 not checked. [2020-07-20 11:59:18,457 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:59:18,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:59:20,464 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1697583780] [2020-07-20 11:59:20,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 11:59:20,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101] total 101 [2020-07-20 11:59:20,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665292695] [2020-07-20 11:59:20,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2020-07-20 11:59:20,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:59:20,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2020-07-20 11:59:20,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=494, Invalid=10218, Unknown=0, NotChecked=0, Total=10712 [2020-07-20 11:59:20,466 INFO L87 Difference]: Start difference. First operand 449 states and 496 transitions. Second operand 101 states. [2020-07-20 12:00:02,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:00:02,776 INFO L93 Difference]: Finished difference Result 461 states and 509 transitions. [2020-07-20 12:00:02,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 148 states. [2020-07-20 12:00:02,781 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 634 [2020-07-20 12:00:02,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:00:02,784 INFO L225 Difference]: With dead ends: 461 [2020-07-20 12:00:02,784 INFO L226 Difference]: Without dead ends: 459 [2020-07-20 12:00:02,786 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 696 GetRequests, 541 SyntacticMatches, 3 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8605 ImplicationChecksByTransitivity, 21.3s TimeCoverageRelationStatistics Valid=938, Invalid=22624, Unknown=0, NotChecked=0, Total=23562 [2020-07-20 12:00:02,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 459 states. [2020-07-20 12:00:02,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 459 to 458. [2020-07-20 12:00:02,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 458 states. [2020-07-20 12:00:02,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 458 states to 458 states and 506 transitions. [2020-07-20 12:00:02,836 INFO L78 Accepts]: Start accepts. Automaton has 458 states and 506 transitions. Word has length 634 [2020-07-20 12:00:02,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:00:02,837 INFO L479 AbstractCegarLoop]: Abstraction has 458 states and 506 transitions. [2020-07-20 12:00:02,837 INFO L480 AbstractCegarLoop]: Interpolant automaton has 101 states. [2020-07-20 12:00:02,837 INFO L276 IsEmpty]: Start isEmpty. Operand 458 states and 506 transitions. [2020-07-20 12:00:02,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 648 [2020-07-20 12:00:02,840 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:00:02,841 INFO L422 BasicCegarLoop]: trace histogram [98, 97, 97, 49, 49, 49, 49, 48, 48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:00:03,041 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:00:03,042 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:00:03,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:00:03,042 INFO L82 PathProgramCache]: Analyzing trace with hash 439207109, now seen corresponding path program 48 times [2020-07-20 12:00:03,043 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:00:03,043 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [533131968] [2020-07-20 12:00:03,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:00:03,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:00:03,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 1210 conjuncts, 105 conjunts are in the unsatisfiable core [2020-07-20 12:00:03,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:00:15,931 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 12:00:17,023 INFO L134 CoverageAnalysis]: Checked inductivity of 24602 backedges. 194 proven. 5784 refuted. 0 times theorem prover too weak. 18624 trivial. 0 not checked. [2020-07-20 12:00:17,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:00:17,546 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:00:19,169 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [533131968] [2020-07-20 12:00:19,169 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 12:00:19,170 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [103] total 103 [2020-07-20 12:00:19,170 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431627362] [2020-07-20 12:00:19,171 INFO L459 AbstractCegarLoop]: Interpolant automaton has 103 states [2020-07-20 12:00:19,171 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:00:19,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2020-07-20 12:00:19,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=504, Invalid=10626, Unknown=0, NotChecked=0, Total=11130 [2020-07-20 12:00:19,172 INFO L87 Difference]: Start difference. First operand 458 states and 506 transitions. Second operand 103 states. [2020-07-20 12:01:06,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:01:06,964 INFO L93 Difference]: Finished difference Result 470 states and 519 transitions. [2020-07-20 12:01:06,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 151 states. [2020-07-20 12:01:06,969 INFO L78 Accepts]: Start accepts. Automaton has 103 states. Word has length 647 [2020-07-20 12:01:06,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:01:06,973 INFO L225 Difference]: With dead ends: 470 [2020-07-20 12:01:06,973 INFO L226 Difference]: Without dead ends: 468 [2020-07-20 12:01:06,974 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 710 GetRequests, 552 SyntacticMatches, 3 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8956 ImplicationChecksByTransitivity, 22.8s TimeCoverageRelationStatistics Valid=957, Invalid=23535, Unknown=0, NotChecked=0, Total=24492 [2020-07-20 12:01:06,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 468 states. [2020-07-20 12:01:07,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 468 to 467. [2020-07-20 12:01:07,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 467 states. [2020-07-20 12:01:07,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 516 transitions. [2020-07-20 12:01:07,005 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 516 transitions. Word has length 647 [2020-07-20 12:01:07,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:01:07,006 INFO L479 AbstractCegarLoop]: Abstraction has 467 states and 516 transitions. [2020-07-20 12:01:07,006 INFO L480 AbstractCegarLoop]: Interpolant automaton has 103 states. [2020-07-20 12:01:07,006 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 516 transitions. [2020-07-20 12:01:07,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 661 [2020-07-20 12:01:07,011 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:01:07,011 INFO L422 BasicCegarLoop]: trace histogram [100, 99, 99, 50, 50, 50, 50, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:01:07,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:01:07,212 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:01:07,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:01:07,213 INFO L82 PathProgramCache]: Analyzing trace with hash -1635902195, now seen corresponding path program 49 times [2020-07-20 12:01:07,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:01:07,214 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1963260689] [2020-07-20 12:01:07,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:01:07,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:01:07,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 1234 conjuncts, 107 conjunts are in the unsatisfiable core [2020-07-20 12:01:07,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:01:21,085 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 12:01:22,249 INFO L134 CoverageAnalysis]: Checked inductivity of 25629 backedges. 198 proven. 6027 refuted. 0 times theorem prover too weak. 19404 trivial. 0 not checked. [2020-07-20 12:01:22,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:01:22,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:01:24,572 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1963260689] [2020-07-20 12:01:24,572 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 12:01:24,572 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [105] total 105 [2020-07-20 12:01:24,572 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497324209] [2020-07-20 12:01:24,573 INFO L459 AbstractCegarLoop]: Interpolant automaton has 105 states [2020-07-20 12:01:24,574 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:01:24,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2020-07-20 12:01:24,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=514, Invalid=11042, Unknown=0, NotChecked=0, Total=11556 [2020-07-20 12:01:24,575 INFO L87 Difference]: Start difference. First operand 467 states and 516 transitions. Second operand 105 states. [2020-07-20 12:02:16,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:02:16,666 INFO L93 Difference]: Finished difference Result 479 states and 529 transitions. [2020-07-20 12:02:16,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 154 states. [2020-07-20 12:02:16,677 INFO L78 Accepts]: Start accepts. Automaton has 105 states. Word has length 660 [2020-07-20 12:02:16,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:02:16,680 INFO L225 Difference]: With dead ends: 479 [2020-07-20 12:02:16,681 INFO L226 Difference]: Without dead ends: 477 [2020-07-20 12:02:16,682 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 724 GetRequests, 563 SyntacticMatches, 3 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9314 ImplicationChecksByTransitivity, 24.8s TimeCoverageRelationStatistics Valid=976, Invalid=24464, Unknown=0, NotChecked=0, Total=25440 [2020-07-20 12:02:16,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 477 states. [2020-07-20 12:02:16,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 477 to 476. [2020-07-20 12:02:16,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 476 states. [2020-07-20 12:02:16,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 526 transitions. [2020-07-20 12:02:16,713 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 526 transitions. Word has length 660 [2020-07-20 12:02:16,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:02:16,714 INFO L479 AbstractCegarLoop]: Abstraction has 476 states and 526 transitions. [2020-07-20 12:02:16,714 INFO L480 AbstractCegarLoop]: Interpolant automaton has 105 states. [2020-07-20 12:02:16,714 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 526 transitions. [2020-07-20 12:02:16,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 674 [2020-07-20 12:02:16,718 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:02:16,718 INFO L422 BasicCegarLoop]: trace histogram [102, 101, 101, 51, 51, 51, 51, 50, 50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:02:16,919 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:02:16,919 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:02:16,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:02:16,920 INFO L82 PathProgramCache]: Analyzing trace with hash 1608350149, now seen corresponding path program 50 times [2020-07-20 12:02:16,920 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:02:16,921 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1757591774] [2020-07-20 12:02:16,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:02:17,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:02:17,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 1258 conjuncts, 109 conjunts are in the unsatisfiable core [2020-07-20 12:02:17,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:02:32,784 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 12:02:34,024 INFO L134 CoverageAnalysis]: Checked inductivity of 26677 backedges. 202 proven. 6275 refuted. 0 times theorem prover too weak. 20200 trivial. 0 not checked. [2020-07-20 12:02:34,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:02:34,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:02:36,665 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1757591774] [2020-07-20 12:02:36,666 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 12:02:36,666 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [107] total 107 [2020-07-20 12:02:36,667 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163874255] [2020-07-20 12:02:36,667 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2020-07-20 12:02:36,667 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:02:36,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2020-07-20 12:02:36,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=524, Invalid=11466, Unknown=0, NotChecked=0, Total=11990 [2020-07-20 12:02:36,668 INFO L87 Difference]: Start difference. First operand 476 states and 526 transitions. Second operand 107 states.