/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 [2020-07-21 11:41:23,412 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 11:41:23,415 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 11:41:23,436 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 11:41:23,437 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 11:41:23,439 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 11:41:23,441 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 11:41:23,454 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 11:41:23,456 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 11:41:23,457 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 11:41:23,458 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 11:41:23,459 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 11:41:23,459 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 11:41:23,460 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 11:41:23,461 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 11:41:23,463 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 11:41:23,463 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 11:41:23,464 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 11:41:23,466 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 11:41:23,467 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 11:41:23,469 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 11:41:23,470 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 11:41:23,471 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 11:41:23,472 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 11:41:23,474 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 11:41:23,475 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 11:41:23,475 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 11:41:23,476 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 11:41:23,477 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 11:41:23,477 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 11:41:23,478 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 11:41:23,478 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 11:41:23,479 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 11:41:23,480 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 11:41:23,481 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 11:41:23,481 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 11:41:23,482 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 11:41:23,482 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 11:41:23,483 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 11:41:23,484 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 11:41:23,484 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 11:41:23,485 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 11:41:23,500 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 11:41:23,500 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 11:41:23,502 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 11:41:23,502 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 11:41:23,502 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 11:41:23,503 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 11:41:23,503 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 11:41:23,503 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 11:41:23,503 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 11:41:23,503 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 11:41:23,504 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 11:41:23,504 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 11:41:23,504 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 11:41:23,504 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 11:41:23,504 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 11:41:23,504 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 11:41:23,505 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 11:41:23,505 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 11:41:23,505 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 11:41:23,505 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 11:41:23,506 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 11:41:23,506 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 11:41:23,506 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 11:41:23,506 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 11:41:23,506 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 11:41:23,507 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 11:41:23,507 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:41:23,507 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 11:41:23,507 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 11:41:23,507 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 [2020-07-21 11:41:23,782 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 11:41:23,800 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 11:41:23,805 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 11:41:23,806 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 11:41:23,809 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 11:41:23,810 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/MADWiFi-encode_ie_ok.i [2020-07-21 11:41:23,896 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/459db8f92/983f47caf22848eca4236ce2dd9509b0/FLAGc7676d80a [2020-07-21 11:41:24,415 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 11:41:24,416 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/MADWiFi-encode_ie_ok.i [2020-07-21 11:41:24,424 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/459db8f92/983f47caf22848eca4236ce2dd9509b0/FLAGc7676d80a [2020-07-21 11:41:24,764 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/459db8f92/983f47caf22848eca4236ce2dd9509b0 [2020-07-21 11:41:24,774 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 11:41:24,777 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 11:41:24,778 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 11:41:24,778 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 11:41:24,782 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 11:41:24,783 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:41:24" (1/1) ... [2020-07-21 11:41:24,786 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@37828335 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:41:24, skipping insertion in model container [2020-07-21 11:41:24,787 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:41:24" (1/1) ... [2020-07-21 11:41:24,795 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 11:41:24,817 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 11:41:25,000 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:41:25,004 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 11:41:25,025 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:41:25,042 INFO L208 MainTranslator]: Completed translation [2020-07-21 11:41:25,043 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:41:25 WrapperNode [2020-07-21 11:41:25,043 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 11:41:25,044 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 11:41:25,044 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 11:41:25,044 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 11:41:25,057 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:41:25" (1/1) ... [2020-07-21 11:41:25,057 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:41:25" (1/1) ... [2020-07-21 11:41:25,063 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:41:25" (1/1) ... [2020-07-21 11:41:25,063 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:41:25" (1/1) ... [2020-07-21 11:41:25,068 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:41:25" (1/1) ... [2020-07-21 11:41:25,074 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:41:25" (1/1) ... [2020-07-21 11:41:25,075 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:41:25" (1/1) ... [2020-07-21 11:41:25,077 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 11:41:25,078 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 11:41:25,078 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 11:41:25,079 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 11:41:25,080 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:41:25" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 11:41:25,237 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 11:41:25,237 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 11:41:25,238 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 11:41:25,238 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 11:41:25,238 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 11:41:25,238 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 11:41:25,238 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 11:41:25,238 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 11:41:25,238 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 11:41:25,239 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 11:41:25,239 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 11:41:25,239 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 11:41:25,239 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 11:41:25,491 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 11:41:25,491 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 11:41:25,496 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:41:25 BoogieIcfgContainer [2020-07-21 11:41:25,497 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 11:41:25,498 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 11:41:25,498 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 11:41:25,502 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 11:41:25,503 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:41:24" (1/3) ... [2020-07-21 11:41:25,504 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9fb9e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:41:25, skipping insertion in model container [2020-07-21 11:41:25,504 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:41:25" (2/3) ... [2020-07-21 11:41:25,504 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9fb9e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:41:25, skipping insertion in model container [2020-07-21 11:41:25,505 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:41:25" (3/3) ... [2020-07-21 11:41:25,506 INFO L109 eAbstractionObserver]: Analyzing ICFG MADWiFi-encode_ie_ok.i [2020-07-21 11:41:25,519 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 11:41:25,528 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 11:41:25,551 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 11:41:25,584 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 11:41:25,585 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 11:41:25,585 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 11:41:25,585 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 11:41:25,585 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 11:41:25,586 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 11:41:25,586 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 11:41:25,586 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 11:41:25,613 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-21 11:41:25,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 11:41:25,623 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:41:25,624 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:41:25,625 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:41:25,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:41:25,634 INFO L82 PathProgramCache]: Analyzing trace with hash 921445730, now seen corresponding path program 1 times [2020-07-21 11:41:25,644 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:41:25,644 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2094551327] [2020-07-21 11:41:25,645 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 [2020-07-21 11:41:25,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:41:25,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 11:41:25,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:41:25,822 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:41:25,864 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:41:25,865 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:41:25,866 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2094551327] [2020-07-21 11:41:25,867 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:41:25,867 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 11:41:25,868 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2048442331] [2020-07-21 11:41:25,877 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 11:41:25,878 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:41:25,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 11:41:25,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 11:41:25,899 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 6 states. [2020-07-21 11:41:26,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:41:26,039 INFO L93 Difference]: Finished difference Result 51 states and 67 transitions. [2020-07-21 11:41:26,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 11:41:26,041 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2020-07-21 11:41:26,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:41:26,052 INFO L225 Difference]: With dead ends: 51 [2020-07-21 11:41:26,052 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 11:41:26,056 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 [2020-07-21 11:41:26,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 11:41:26,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-21 11:41:26,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 11:41:26,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-07-21 11:41:26,106 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 18 [2020-07-21 11:41:26,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:41:26,107 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-07-21 11:41:26,108 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 11:41:26,108 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-07-21 11:41:26,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 11:41:26,109 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:41:26,110 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] [2020-07-21 11:41:26,324 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:41:26,324 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:41:26,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:41:26,325 INFO L82 PathProgramCache]: Analyzing trace with hash 487181509, now seen corresponding path program 1 times [2020-07-21 11:41:26,325 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:41:26,326 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [434273202] [2020-07-21 11:41:26,327 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 [2020-07-21 11:41:26,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:41:26,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 11:41:26,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:41:26,397 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:41:26,422 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:41:26,422 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:41:26,422 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [434273202] [2020-07-21 11:41:26,423 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:41:26,423 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 11:41:26,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063505840] [2020-07-21 11:41:26,425 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 11:41:26,426 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:41:26,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 11:41:26,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 11:41:26,427 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 6 states. [2020-07-21 11:41:26,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:41:26,515 INFO L93 Difference]: Finished difference Result 38 states and 39 transitions. [2020-07-21 11:41:26,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 11:41:26,516 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2020-07-21 11:41:26,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:41:26,519 INFO L225 Difference]: With dead ends: 38 [2020-07-21 11:41:26,520 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 11:41:26,521 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 [2020-07-21 11:41:26,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 11:41:26,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-07-21 11:41:26,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 11:41:26,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-07-21 11:41:26,535 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 23 [2020-07-21 11:41:26,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:41:26,536 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-07-21 11:41:26,536 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 11:41:26,536 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-07-21 11:41:26,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-07-21 11:41:26,539 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:41:26,539 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] [2020-07-21 11:41:26,753 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:41:26,754 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:41:26,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:41:26,755 INFO L82 PathProgramCache]: Analyzing trace with hash 258938125, now seen corresponding path program 1 times [2020-07-21 11:41:26,756 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:41:26,756 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [875161078] [2020-07-21 11:41:26,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:41:26,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:41:26,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 11:41:26,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:41:26,883 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:41:26,935 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 11:41:26,936 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:41:26,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:41:27,094 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [875161078] [2020-07-21 11:41:27,094 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:41:27,094 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-07-21 11:41:27,094 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [26819141] [2020-07-21 11:41:27,095 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 11:41:27,096 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:41:27,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 11:41:27,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2020-07-21 11:41:27,097 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 9 states. [2020-07-21 11:41:27,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:41:27,260 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2020-07-21 11:41:27,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 11:41:27,261 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 36 [2020-07-21 11:41:27,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:41:27,263 INFO L225 Difference]: With dead ends: 47 [2020-07-21 11:41:27,263 INFO L226 Difference]: Without dead ends: 45 [2020-07-21 11:41:27,264 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 [2020-07-21 11:41:27,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-21 11:41:27,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2020-07-21 11:41:27,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-21 11:41:27,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-07-21 11:41:27,275 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 36 [2020-07-21 11:41:27,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:41:27,275 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-07-21 11:41:27,275 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 11:41:27,276 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-07-21 11:41:27,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-21 11:41:27,277 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:41:27,278 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] [2020-07-21 11:41:27,490 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:41:27,491 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:41:27,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:41:27,492 INFO L82 PathProgramCache]: Analyzing trace with hash -801144379, now seen corresponding path program 2 times [2020-07-21 11:41:27,493 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:41:27,494 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1546626940] [2020-07-21 11:41:27,494 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 [2020-07-21 11:41:27,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:41:27,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 11:41:27,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:41:27,639 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:41:27,686 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 10 proven. 11 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 11:41:27,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:41:27,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:41:27,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1546626940] [2020-07-21 11:41:27,837 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:41:27,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-07-21 11:41:27,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980107181] [2020-07-21 11:41:27,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 11:41:27,839 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:41:27,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 11:41:27,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2020-07-21 11:41:27,840 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 11 states. [2020-07-21 11:41:28,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:41:28,077 INFO L93 Difference]: Finished difference Result 56 states and 59 transitions. [2020-07-21 11:41:28,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 11:41:28,078 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2020-07-21 11:41:28,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:41:28,080 INFO L225 Difference]: With dead ends: 56 [2020-07-21 11:41:28,080 INFO L226 Difference]: Without dead ends: 54 [2020-07-21 11:41:28,081 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=83, Invalid=259, Unknown=0, NotChecked=0, Total=342 [2020-07-21 11:41:28,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-21 11:41:28,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-07-21 11:41:28,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-21 11:41:28,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-07-21 11:41:28,093 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 49 [2020-07-21 11:41:28,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:41:28,094 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-07-21 11:41:28,094 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 11:41:28,094 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-07-21 11:41:28,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-07-21 11:41:28,097 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:41:28,097 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] [2020-07-21 11:41:28,312 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:41:28,313 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:41:28,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:41:28,313 INFO L82 PathProgramCache]: Analyzing trace with hash -907575283, now seen corresponding path program 3 times [2020-07-21 11:41:28,314 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:41:28,314 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [722016360] [2020-07-21 11:41:28,315 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 [2020-07-21 11:41:28,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:41:28,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 11:41:28,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:41:28,514 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:41:28,573 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 14 proven. 24 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 11:41:28,573 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:41:28,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:41:28,716 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [722016360] [2020-07-21 11:41:28,717 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:41:28,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-07-21 11:41:28,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711549831] [2020-07-21 11:41:28,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 11:41:28,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:41:28,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 11:41:28,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2020-07-21 11:41:28,719 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 13 states. [2020-07-21 11:41:29,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:41:29,052 INFO L93 Difference]: Finished difference Result 65 states and 69 transitions. [2020-07-21 11:41:29,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 11:41:29,053 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 62 [2020-07-21 11:41:29,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:41:29,054 INFO L225 Difference]: With dead ends: 65 [2020-07-21 11:41:29,055 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 11:41:29,056 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 [2020-07-21 11:41:29,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 11:41:29,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2020-07-21 11:41:29,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-07-21 11:41:29,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 66 transitions. [2020-07-21 11:41:29,067 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 66 transitions. Word has length 62 [2020-07-21 11:41:29,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:41:29,068 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 66 transitions. [2020-07-21 11:41:29,068 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 11:41:29,068 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 66 transitions. [2020-07-21 11:41:29,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-07-21 11:41:29,070 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:41:29,070 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] [2020-07-21 11:41:29,277 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:41:29,278 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:41:29,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:41:29,279 INFO L82 PathProgramCache]: Analyzing trace with hash -1945307451, now seen corresponding path program 4 times [2020-07-21 11:41:29,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:41:29,280 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [133968729] [2020-07-21 11:41:29,281 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 [2020-07-21 11:41:29,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:41:29,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 11:41:29,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:41:29,481 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:41:29,523 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 18 proven. 42 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 11:41:29,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:41:29,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:41:29,679 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [133968729] [2020-07-21 11:41:29,680 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:41:29,680 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-07-21 11:41:29,680 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367562796] [2020-07-21 11:41:29,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 11:41:29,685 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:41:29,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 11:41:29,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2020-07-21 11:41:29,686 INFO L87 Difference]: Start difference. First operand 62 states and 66 transitions. Second operand 15 states. [2020-07-21 11:41:30,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:41:30,108 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-07-21 11:41:30,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 11:41:30,109 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 75 [2020-07-21 11:41:30,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:41:30,110 INFO L225 Difference]: With dead ends: 74 [2020-07-21 11:41:30,111 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 11:41:30,113 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 68 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=121, Invalid=479, Unknown=0, NotChecked=0, Total=600 [2020-07-21 11:41:30,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 11:41:30,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-07-21 11:41:30,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 11:41:30,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 76 transitions. [2020-07-21 11:41:30,126 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 76 transitions. Word has length 75 [2020-07-21 11:41:30,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:41:30,126 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 76 transitions. [2020-07-21 11:41:30,126 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 11:41:30,126 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 76 transitions. [2020-07-21 11:41:30,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-07-21 11:41:30,128 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:41:30,129 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] [2020-07-21 11:41:30,342 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:41:30,343 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:41:30,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:41:30,344 INFO L82 PathProgramCache]: Analyzing trace with hash -1067439347, now seen corresponding path program 5 times [2020-07-21 11:41:30,344 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:41:30,345 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [598228248] [2020-07-21 11:41:30,345 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 [2020-07-21 11:41:30,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:41:30,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 11:41:30,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:41:30,613 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:41:30,673 INFO L134 CoverageAnalysis]: Checked inductivity of 307 backedges. 22 proven. 65 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 11:41:30,673 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:41:30,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:41:30,845 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [598228248] [2020-07-21 11:41:30,846 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:41:30,846 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-07-21 11:41:30,846 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433134715] [2020-07-21 11:41:30,847 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 11:41:30,847 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:41:30,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 11:41:30,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=306, Unknown=0, NotChecked=0, Total=380 [2020-07-21 11:41:30,851 INFO L87 Difference]: Start difference. First operand 71 states and 76 transitions. Second operand 17 states. [2020-07-21 11:41:31,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:41:31,329 INFO L93 Difference]: Finished difference Result 83 states and 89 transitions. [2020-07-21 11:41:31,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 11:41:31,330 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 88 [2020-07-21 11:41:31,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:41:31,332 INFO L225 Difference]: With dead ends: 83 [2020-07-21 11:41:31,332 INFO L226 Difference]: Without dead ends: 81 [2020-07-21 11:41:31,334 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 [2020-07-21 11:41:31,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-21 11:41:31,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2020-07-21 11:41:31,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-21 11:41:31,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 86 transitions. [2020-07-21 11:41:31,346 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 86 transitions. Word has length 88 [2020-07-21 11:41:31,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:41:31,347 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 86 transitions. [2020-07-21 11:41:31,347 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 11:41:31,347 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 86 transitions. [2020-07-21 11:41:31,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2020-07-21 11:41:31,349 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:41:31,349 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] [2020-07-21 11:41:31,553 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:41:31,554 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:41:31,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:41:31,555 INFO L82 PathProgramCache]: Analyzing trace with hash -29217851, now seen corresponding path program 6 times [2020-07-21 11:41:31,555 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:41:31,556 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [547395379] [2020-07-21 11:41:31,556 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 [2020-07-21 11:41:31,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:41:31,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 11:41:31,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:41:31,816 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:41:31,870 INFO L134 CoverageAnalysis]: Checked inductivity of 431 backedges. 26 proven. 93 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 11:41:31,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:41:31,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:41:32,026 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [547395379] [2020-07-21 11:41:32,027 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:41:32,027 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-07-21 11:41:32,027 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090133581] [2020-07-21 11:41:32,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 11:41:32,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:41:32,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 11:41:32,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=378, Unknown=0, NotChecked=0, Total=462 [2020-07-21 11:41:32,029 INFO L87 Difference]: Start difference. First operand 80 states and 86 transitions. Second operand 19 states. [2020-07-21 11:41:32,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:41:32,650 INFO L93 Difference]: Finished difference Result 92 states and 99 transitions. [2020-07-21 11:41:32,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 11:41:32,651 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 101 [2020-07-21 11:41:32,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:41:32,653 INFO L225 Difference]: With dead ends: 92 [2020-07-21 11:41:32,653 INFO L226 Difference]: Without dead ends: 90 [2020-07-21 11:41:32,654 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 90 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=159, Invalid=771, Unknown=0, NotChecked=0, Total=930 [2020-07-21 11:41:32,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-21 11:41:32,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-07-21 11:41:32,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-07-21 11:41:32,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 96 transitions. [2020-07-21 11:41:32,669 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 96 transitions. Word has length 101 [2020-07-21 11:41:32,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:41:32,669 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 96 transitions. [2020-07-21 11:41:32,670 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 11:41:32,670 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 96 transitions. [2020-07-21 11:41:32,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-07-21 11:41:32,672 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:41:32,672 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] [2020-07-21 11:41:32,884 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:41:32,885 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:41:32,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:41:32,886 INFO L82 PathProgramCache]: Analyzing trace with hash 923342349, now seen corresponding path program 7 times [2020-07-21 11:41:32,887 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:41:32,887 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [888273486] [2020-07-21 11:41:32,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:41:32,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:41:32,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 11:41:32,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:41:33,199 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:41:33,266 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 30 proven. 126 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 11:41:33,267 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:41:33,301 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:41:33,433 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [888273486] [2020-07-21 11:41:33,434 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:41:33,434 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-07-21 11:41:33,434 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1162758555] [2020-07-21 11:41:33,435 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 11:41:33,435 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:41:33,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 11:41:33,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=458, Unknown=0, NotChecked=0, Total=552 [2020-07-21 11:41:33,436 INFO L87 Difference]: Start difference. First operand 89 states and 96 transitions. Second operand 21 states. [2020-07-21 11:41:34,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:41:34,119 INFO L93 Difference]: Finished difference Result 101 states and 109 transitions. [2020-07-21 11:41:34,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-21 11:41:34,120 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 114 [2020-07-21 11:41:34,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:41:34,121 INFO L225 Difference]: With dead ends: 101 [2020-07-21 11:41:34,121 INFO L226 Difference]: Without dead ends: 99 [2020-07-21 11:41:34,123 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 [2020-07-21 11:41:34,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-07-21 11:41:34,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2020-07-21 11:41:34,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-07-21 11:41:34,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 106 transitions. [2020-07-21 11:41:34,135 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 106 transitions. Word has length 114 [2020-07-21 11:41:34,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:41:34,136 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 106 transitions. [2020-07-21 11:41:34,136 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 11:41:34,136 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 106 transitions. [2020-07-21 11:41:34,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-07-21 11:41:34,139 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:41:34,139 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] [2020-07-21 11:41:34,352 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:41:34,353 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:41:34,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:41:34,354 INFO L82 PathProgramCache]: Analyzing trace with hash 816783557, now seen corresponding path program 8 times [2020-07-21 11:41:34,355 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:41:34,355 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [565255332] [2020-07-21 11:41:34,355 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 [2020-07-21 11:41:34,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:41:34,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 11:41:34,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:41:34,672 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:41:34,740 INFO L134 CoverageAnalysis]: Checked inductivity of 742 backedges. 34 proven. 164 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 11:41:34,740 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:41:34,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:41:34,943 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [565255332] [2020-07-21 11:41:34,943 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:41:34,943 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-07-21 11:41:34,944 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [215089943] [2020-07-21 11:41:34,944 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 11:41:34,945 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:41:34,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 11:41:34,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=546, Unknown=0, NotChecked=0, Total=650 [2020-07-21 11:41:34,946 INFO L87 Difference]: Start difference. First operand 98 states and 106 transitions. Second operand 23 states. [2020-07-21 11:41:35,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:41:35,724 INFO L93 Difference]: Finished difference Result 110 states and 119 transitions. [2020-07-21 11:41:35,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-21 11:41:35,725 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 127 [2020-07-21 11:41:35,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:41:35,727 INFO L225 Difference]: With dead ends: 110 [2020-07-21 11:41:35,727 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 11:41:35,729 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 [2020-07-21 11:41:35,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 11:41:35,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-07-21 11:41:35,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-21 11:41:35,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 116 transitions. [2020-07-21 11:41:35,743 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 116 transitions. Word has length 127 [2020-07-21 11:41:35,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:41:35,743 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 116 transitions. [2020-07-21 11:41:35,744 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 11:41:35,744 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 116 transitions. [2020-07-21 11:41:35,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2020-07-21 11:41:35,751 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:41:35,751 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] [2020-07-21 11:41:35,967 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:41:35,968 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:41:35,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:41:35,968 INFO L82 PathProgramCache]: Analyzing trace with hash -1777188595, now seen corresponding path program 9 times [2020-07-21 11:41:35,969 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:41:35,969 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1328965848] [2020-07-21 11:41:35,969 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 [2020-07-21 11:41:36,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:41:36,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 11:41:36,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:41:36,341 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:41:36,421 INFO L134 CoverageAnalysis]: Checked inductivity of 929 backedges. 38 proven. 207 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 11:41:36,421 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:41:36,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:41:36,600 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1328965848] [2020-07-21 11:41:36,600 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:41:36,601 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-07-21 11:41:36,601 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1833308162] [2020-07-21 11:41:36,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 11:41:36,602 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:41:36,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 11:41:36,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=642, Unknown=0, NotChecked=0, Total=756 [2020-07-21 11:41:36,603 INFO L87 Difference]: Start difference. First operand 107 states and 116 transitions. Second operand 25 states. [2020-07-21 11:41:37,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:41:37,538 INFO L93 Difference]: Finished difference Result 119 states and 129 transitions. [2020-07-21 11:41:37,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 11:41:37,539 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 140 [2020-07-21 11:41:37,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:41:37,542 INFO L225 Difference]: With dead ends: 119 [2020-07-21 11:41:37,542 INFO L226 Difference]: Without dead ends: 117 [2020-07-21 11:41:37,543 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 123 SyntacticMatches, 3 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=216, Invalid=1344, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 11:41:37,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2020-07-21 11:41:37,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 116. [2020-07-21 11:41:37,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-21 11:41:37,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 126 transitions. [2020-07-21 11:41:37,554 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 126 transitions. Word has length 140 [2020-07-21 11:41:37,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:41:37,555 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 126 transitions. [2020-07-21 11:41:37,555 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 11:41:37,555 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 126 transitions. [2020-07-21 11:41:37,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2020-07-21 11:41:37,557 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:41:37,557 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] [2020-07-21 11:41:37,765 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:41:37,765 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:41:37,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:41:37,766 INFO L82 PathProgramCache]: Analyzing trace with hash -1994140219, now seen corresponding path program 10 times [2020-07-21 11:41:37,767 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:41:37,767 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1433618979] [2020-07-21 11:41:37,767 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 [2020-07-21 11:41:37,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:41:37,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 29 conjunts are in the unsatisfiable core [2020-07-21 11:41:37,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:41:38,217 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:41:38,306 INFO L134 CoverageAnalysis]: Checked inductivity of 1137 backedges. 42 proven. 255 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 11:41:38,306 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:41:38,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:41:38,510 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1433618979] [2020-07-21 11:41:38,511 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:41:38,511 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-07-21 11:41:38,511 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936054955] [2020-07-21 11:41:38,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 11:41:38,512 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:41:38,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 11:41:38,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=746, Unknown=0, NotChecked=0, Total=870 [2020-07-21 11:41:38,513 INFO L87 Difference]: Start difference. First operand 116 states and 126 transitions. Second operand 27 states. [2020-07-21 11:41:39,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:41:39,526 INFO L93 Difference]: Finished difference Result 128 states and 139 transitions. [2020-07-21 11:41:39,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-07-21 11:41:39,527 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 153 [2020-07-21 11:41:39,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:41:39,529 INFO L225 Difference]: With dead ends: 128 [2020-07-21 11:41:39,529 INFO L226 Difference]: Without dead ends: 126 [2020-07-21 11:41:39,530 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 [2020-07-21 11:41:39,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-07-21 11:41:39,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2020-07-21 11:41:39,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-07-21 11:41:39,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 136 transitions. [2020-07-21 11:41:39,553 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 136 transitions. Word has length 153 [2020-07-21 11:41:39,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:41:39,561 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 136 transitions. [2020-07-21 11:41:39,561 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 11:41:39,562 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 136 transitions. [2020-07-21 11:41:39,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2020-07-21 11:41:39,563 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:41:39,563 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] [2020-07-21 11:41:39,776 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:41:39,777 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:41:39,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:41:39,778 INFO L82 PathProgramCache]: Analyzing trace with hash 1772858381, now seen corresponding path program 11 times [2020-07-21 11:41:39,778 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:41:39,779 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [877390170] [2020-07-21 11:41:39,779 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 [2020-07-21 11:41:39,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:41:39,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 31 conjunts are in the unsatisfiable core [2020-07-21 11:41:39,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:41:40,272 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:41:40,380 INFO L134 CoverageAnalysis]: Checked inductivity of 1366 backedges. 46 proven. 308 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 11:41:40,380 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:41:40,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:41:40,582 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [877390170] [2020-07-21 11:41:40,582 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:41:40,583 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-07-21 11:41:40,583 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511653739] [2020-07-21 11:41:40,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 11:41:40,583 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:41:40,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 11:41:40,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=858, Unknown=0, NotChecked=0, Total=992 [2020-07-21 11:41:40,584 INFO L87 Difference]: Start difference. First operand 125 states and 136 transitions. Second operand 29 states. [2020-07-21 11:41:41,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:41:41,729 INFO L93 Difference]: Finished difference Result 137 states and 149 transitions. [2020-07-21 11:41:41,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-21 11:41:41,730 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 166 [2020-07-21 11:41:41,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:41:41,732 INFO L225 Difference]: With dead ends: 137 [2020-07-21 11:41:41,733 INFO L226 Difference]: Without dead ends: 135 [2020-07-21 11:41:41,734 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 [2020-07-21 11:41:41,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2020-07-21 11:41:41,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 134. [2020-07-21 11:41:41,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2020-07-21 11:41:41,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 146 transitions. [2020-07-21 11:41:41,748 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 146 transitions. Word has length 166 [2020-07-21 11:41:41,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:41:41,749 INFO L479 AbstractCegarLoop]: Abstraction has 134 states and 146 transitions. [2020-07-21 11:41:41,749 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 11:41:41,750 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 146 transitions. [2020-07-21 11:41:41,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2020-07-21 11:41:41,752 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:41:41,753 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] [2020-07-21 11:41:41,955 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:41:41,956 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:41:41,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:41:41,957 INFO L82 PathProgramCache]: Analyzing trace with hash -915387707, now seen corresponding path program 12 times [2020-07-21 11:41:41,957 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:41:41,958 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1638051867] [2020-07-21 11:41:41,958 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 [2020-07-21 11:41:42,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:41:42,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 33 conjunts are in the unsatisfiable core [2020-07-21 11:41:42,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:41:42,579 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:41:42,773 INFO L134 CoverageAnalysis]: Checked inductivity of 1616 backedges. 50 proven. 366 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 11:41:42,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:41:42,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:41:43,084 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1638051867] [2020-07-21 11:41:43,084 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:41:43,085 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-07-21 11:41:43,085 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917456576] [2020-07-21 11:41:43,086 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 11:41:43,086 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:41:43,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 11:41:43,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=978, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 11:41:43,087 INFO L87 Difference]: Start difference. First operand 134 states and 146 transitions. Second operand 31 states. [2020-07-21 11:41:44,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:41:44,478 INFO L93 Difference]: Finished difference Result 146 states and 159 transitions. [2020-07-21 11:41:44,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-07-21 11:41:44,479 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 179 [2020-07-21 11:41:44,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:41:44,481 INFO L225 Difference]: With dead ends: 146 [2020-07-21 11:41:44,481 INFO L226 Difference]: Without dead ends: 144 [2020-07-21 11:41:44,483 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 156 SyntacticMatches, 3 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 730 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=273, Invalid=2079, Unknown=0, NotChecked=0, Total=2352 [2020-07-21 11:41:44,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2020-07-21 11:41:44,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 143. [2020-07-21 11:41:44,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2020-07-21 11:41:44,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 156 transitions. [2020-07-21 11:41:44,495 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 156 transitions. Word has length 179 [2020-07-21 11:41:44,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:41:44,496 INFO L479 AbstractCegarLoop]: Abstraction has 143 states and 156 transitions. [2020-07-21 11:41:44,496 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 11:41:44,496 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 156 transitions. [2020-07-21 11:41:44,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2020-07-21 11:41:44,498 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:41:44,498 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] [2020-07-21 11:41:44,699 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:41:44,700 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:41:44,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:41:44,701 INFO L82 PathProgramCache]: Analyzing trace with hash 1644517133, now seen corresponding path program 13 times [2020-07-21 11:41:44,701 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:41:44,702 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1931642894] [2020-07-21 11:41:44,702 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 [2020-07-21 11:41:44,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:41:44,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 370 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-21 11:41:44,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:41:45,323 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:41:45,424 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 54 proven. 429 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 11:41:45,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:41:45,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:41:45,663 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1931642894] [2020-07-21 11:41:45,664 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:41:45,664 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-07-21 11:41:45,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636673852] [2020-07-21 11:41:45,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 11:41:45,665 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:41:45,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 11:41:45,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=1106, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 11:41:45,666 INFO L87 Difference]: Start difference. First operand 143 states and 156 transitions. Second operand 33 states. [2020-07-21 11:41:47,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:41:47,152 INFO L93 Difference]: Finished difference Result 155 states and 169 transitions. [2020-07-21 11:41:47,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-21 11:41:47,153 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 192 [2020-07-21 11:41:47,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:41:47,156 INFO L225 Difference]: With dead ends: 155 [2020-07-21 11:41:47,156 INFO L226 Difference]: Without dead ends: 153 [2020-07-21 11:41:47,158 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 [2020-07-21 11:41:47,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2020-07-21 11:41:47,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 152. [2020-07-21 11:41:47,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2020-07-21 11:41:47,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 166 transitions. [2020-07-21 11:41:47,171 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 166 transitions. Word has length 192 [2020-07-21 11:41:47,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:41:47,171 INFO L479 AbstractCegarLoop]: Abstraction has 152 states and 166 transitions. [2020-07-21 11:41:47,171 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 11:41:47,172 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 166 transitions. [2020-07-21 11:41:47,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2020-07-21 11:41:47,173 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:41:47,173 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] [2020-07-21 11:41:47,381 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:41:47,381 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:41:47,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:41:47,382 INFO L82 PathProgramCache]: Analyzing trace with hash 258244549, now seen corresponding path program 14 times [2020-07-21 11:41:47,382 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:41:47,383 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1210490478] [2020-07-21 11:41:47,383 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 [2020-07-21 11:41:47,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:41:47,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 37 conjunts are in the unsatisfiable core [2020-07-21 11:41:47,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:41:48,058 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:41:48,220 INFO L134 CoverageAnalysis]: Checked inductivity of 2179 backedges. 58 proven. 497 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 11:41:48,220 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:41:48,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:41:48,465 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1210490478] [2020-07-21 11:41:48,465 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:41:48,465 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-07-21 11:41:48,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218826707] [2020-07-21 11:41:48,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 11:41:48,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:41:48,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 11:41:48,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=1242, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 11:41:48,467 INFO L87 Difference]: Start difference. First operand 152 states and 166 transitions. Second operand 35 states. [2020-07-21 11:41:50,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:41:50,359 INFO L93 Difference]: Finished difference Result 164 states and 179 transitions. [2020-07-21 11:41:50,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-07-21 11:41:50,360 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 205 [2020-07-21 11:41:50,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:41:50,362 INFO L225 Difference]: With dead ends: 164 [2020-07-21 11:41:50,362 INFO L226 Difference]: Without dead ends: 162 [2020-07-21 11:41:50,365 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 178 SyntacticMatches, 3 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 949 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=311, Invalid=2659, Unknown=0, NotChecked=0, Total=2970 [2020-07-21 11:41:50,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-07-21 11:41:50,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 161. [2020-07-21 11:41:50,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 161 states. [2020-07-21 11:41:50,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 176 transitions. [2020-07-21 11:41:50,383 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 176 transitions. Word has length 205 [2020-07-21 11:41:50,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:41:50,386 INFO L479 AbstractCegarLoop]: Abstraction has 161 states and 176 transitions. [2020-07-21 11:41:50,386 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 11:41:50,386 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 176 transitions. [2020-07-21 11:41:50,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2020-07-21 11:41:50,394 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:41:50,394 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] [2020-07-21 11:41:50,607 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:41:50,608 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:41:50,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:41:50,608 INFO L82 PathProgramCache]: Analyzing trace with hash 1397703181, now seen corresponding path program 15 times [2020-07-21 11:41:50,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:41:50,608 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1909680435] [2020-07-21 11:41:50,609 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 [2020-07-21 11:41:50,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:41:50,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-21 11:41:50,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:41:51,384 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:41:51,507 INFO L134 CoverageAnalysis]: Checked inductivity of 2492 backedges. 62 proven. 570 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 11:41:51,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:41:51,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:41:51,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1909680435] [2020-07-21 11:41:51,782 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:41:51,782 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-07-21 11:41:51,782 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484684649] [2020-07-21 11:41:51,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-21 11:41:51,783 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:41:51,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-21 11:41:51,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1386, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 11:41:51,784 INFO L87 Difference]: Start difference. First operand 161 states and 176 transitions. Second operand 37 states. [2020-07-21 11:41:53,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:41:53,679 INFO L93 Difference]: Finished difference Result 173 states and 189 transitions. [2020-07-21 11:41:53,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-21 11:41:53,680 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 218 [2020-07-21 11:41:53,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:41:53,681 INFO L225 Difference]: With dead ends: 173 [2020-07-21 11:41:53,682 INFO L226 Difference]: Without dead ends: 171 [2020-07-21 11:41:53,683 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 [2020-07-21 11:41:53,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2020-07-21 11:41:53,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 170. [2020-07-21 11:41:53,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2020-07-21 11:41:53,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 186 transitions. [2020-07-21 11:41:53,697 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 186 transitions. Word has length 218 [2020-07-21 11:41:53,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:41:53,698 INFO L479 AbstractCegarLoop]: Abstraction has 170 states and 186 transitions. [2020-07-21 11:41:53,698 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-21 11:41:53,698 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 186 transitions. [2020-07-21 11:41:53,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2020-07-21 11:41:53,700 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:41:53,700 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] [2020-07-21 11:41:53,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:41:53,915 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:41:53,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:41:53,916 INFO L82 PathProgramCache]: Analyzing trace with hash -724536123, now seen corresponding path program 16 times [2020-07-21 11:41:53,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:41:53,916 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1614320390] [2020-07-21 11:41:53,917 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 [2020-07-21 11:41:53,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:41:53,988 INFO L263 TraceCheckSpWp]: Trace formula consists of 442 conjuncts, 41 conjunts are in the unsatisfiable core [2020-07-21 11:41:53,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:41:54,749 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:41:54,905 INFO L134 CoverageAnalysis]: Checked inductivity of 2826 backedges. 66 proven. 648 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 11:41:54,905 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:41:54,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:41:55,179 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1614320390] [2020-07-21 11:41:55,179 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:41:55,180 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-07-21 11:41:55,180 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985464565] [2020-07-21 11:41:55,180 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-07-21 11:41:55,181 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:41:55,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-07-21 11:41:55,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1538, Unknown=0, NotChecked=0, Total=1722 [2020-07-21 11:41:55,182 INFO L87 Difference]: Start difference. First operand 170 states and 186 transitions. Second operand 39 states. [2020-07-21 11:41:57,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:41:57,423 INFO L93 Difference]: Finished difference Result 182 states and 199 transitions. [2020-07-21 11:41:57,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-07-21 11:41:57,423 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 231 [2020-07-21 11:41:57,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:41:57,425 INFO L225 Difference]: With dead ends: 182 [2020-07-21 11:41:57,425 INFO L226 Difference]: Without dead ends: 180 [2020-07-21 11:41:57,426 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 [2020-07-21 11:41:57,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2020-07-21 11:41:57,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 179. [2020-07-21 11:41:57,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2020-07-21 11:41:57,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 196 transitions. [2020-07-21 11:41:57,444 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 196 transitions. Word has length 231 [2020-07-21 11:41:57,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:41:57,444 INFO L479 AbstractCegarLoop]: Abstraction has 179 states and 196 transitions. [2020-07-21 11:41:57,444 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-07-21 11:41:57,444 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 196 transitions. [2020-07-21 11:41:57,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2020-07-21 11:41:57,446 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:41:57,446 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] [2020-07-21 11:41:57,657 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:41:57,658 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:41:57,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:41:57,659 INFO L82 PathProgramCache]: Analyzing trace with hash 901344525, now seen corresponding path program 17 times [2020-07-21 11:41:57,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:41:57,661 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [92882973] [2020-07-21 11:41:57,661 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 [2020-07-21 11:41:57,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:41:57,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 466 conjuncts, 43 conjunts are in the unsatisfiable core [2020-07-21 11:41:57,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:41:58,597 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:41:58,743 INFO L134 CoverageAnalysis]: Checked inductivity of 3181 backedges. 70 proven. 731 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 11:41:58,743 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:41:58,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:41:59,043 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [92882973] [2020-07-21 11:41:59,044 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:41:59,044 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-07-21 11:41:59,044 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913963580] [2020-07-21 11:41:59,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-07-21 11:41:59,045 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:41:59,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-07-21 11:41:59,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=1698, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 11:41:59,046 INFO L87 Difference]: Start difference. First operand 179 states and 196 transitions. Second operand 41 states. [2020-07-21 11:42:01,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:42:01,458 INFO L93 Difference]: Finished difference Result 191 states and 209 transitions. [2020-07-21 11:42:01,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-07-21 11:42:01,459 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 244 [2020-07-21 11:42:01,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:42:01,462 INFO L225 Difference]: With dead ends: 191 [2020-07-21 11:42:01,462 INFO L226 Difference]: Without dead ends: 189 [2020-07-21 11:42:01,464 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 211 SyntacticMatches, 3 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1330 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=368, Invalid=3664, Unknown=0, NotChecked=0, Total=4032 [2020-07-21 11:42:01,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2020-07-21 11:42:01,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 188. [2020-07-21 11:42:01,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2020-07-21 11:42:01,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 206 transitions. [2020-07-21 11:42:01,480 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 206 transitions. Word has length 244 [2020-07-21 11:42:01,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:42:01,480 INFO L479 AbstractCegarLoop]: Abstraction has 188 states and 206 transitions. [2020-07-21 11:42:01,481 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-07-21 11:42:01,481 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 206 transitions. [2020-07-21 11:42:01,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2020-07-21 11:42:01,482 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:42:01,483 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] [2020-07-21 11:42:01,696 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:42:01,697 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:42:01,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:42:01,697 INFO L82 PathProgramCache]: Analyzing trace with hash -276551227, now seen corresponding path program 18 times [2020-07-21 11:42:01,697 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:42:01,697 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1792512899] [2020-07-21 11:42:01,698 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 [2020-07-21 11:42:01,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:42:01,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 490 conjuncts, 45 conjunts are in the unsatisfiable core [2020-07-21 11:42:01,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:42:02,703 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:42:02,860 INFO L134 CoverageAnalysis]: Checked inductivity of 3557 backedges. 74 proven. 819 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 11:42:02,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:42:02,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:42:03,154 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1792512899] [2020-07-21 11:42:03,154 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:42:03,154 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-07-21 11:42:03,155 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656844381] [2020-07-21 11:42:03,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-07-21 11:42:03,155 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:42:03,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-07-21 11:42:03,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=1866, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 11:42:03,157 INFO L87 Difference]: Start difference. First operand 188 states and 206 transitions. Second operand 43 states. [2020-07-21 11:42:05,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:42:05,741 INFO L93 Difference]: Finished difference Result 200 states and 219 transitions. [2020-07-21 11:42:05,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-07-21 11:42:05,743 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 257 [2020-07-21 11:42:05,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:42:05,745 INFO L225 Difference]: With dead ends: 200 [2020-07-21 11:42:05,745 INFO L226 Difference]: Without dead ends: 198 [2020-07-21 11:42:05,747 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 [2020-07-21 11:42:05,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2020-07-21 11:42:05,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 197. [2020-07-21 11:42:05,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2020-07-21 11:42:05,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 216 transitions. [2020-07-21 11:42:05,763 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 216 transitions. Word has length 257 [2020-07-21 11:42:05,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:42:05,764 INFO L479 AbstractCegarLoop]: Abstraction has 197 states and 216 transitions. [2020-07-21 11:42:05,765 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-07-21 11:42:05,765 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 216 transitions. [2020-07-21 11:42:05,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 271 [2020-07-21 11:42:05,767 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:42:05,767 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] [2020-07-21 11:42:05,981 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:42:05,982 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:42:05,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:42:05,983 INFO L82 PathProgramCache]: Analyzing trace with hash 628348941, now seen corresponding path program 19 times [2020-07-21 11:42:05,983 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:42:05,984 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1017852803] [2020-07-21 11:42:05,984 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 [2020-07-21 11:42:06,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:42:06,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 514 conjuncts, 47 conjunts are in the unsatisfiable core [2020-07-21 11:42:06,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:42:07,161 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:42:07,347 INFO L134 CoverageAnalysis]: Checked inductivity of 3954 backedges. 78 proven. 912 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 11:42:07,347 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:42:07,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:42:07,696 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1017852803] [2020-07-21 11:42:07,697 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:42:07,697 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-07-21 11:42:07,697 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13779142] [2020-07-21 11:42:07,698 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-07-21 11:42:07,698 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:42:07,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-07-21 11:42:07,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=2042, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 11:42:07,699 INFO L87 Difference]: Start difference. First operand 197 states and 216 transitions. Second operand 45 states. [2020-07-21 11:42:10,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:42:10,682 INFO L93 Difference]: Finished difference Result 209 states and 229 transitions. [2020-07-21 11:42:10,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-21 11:42:10,683 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 270 [2020-07-21 11:42:10,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:42:10,687 INFO L225 Difference]: With dead ends: 209 [2020-07-21 11:42:10,687 INFO L226 Difference]: Without dead ends: 207 [2020-07-21 11:42:10,689 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 233 SyntacticMatches, 3 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1619 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=406, Invalid=4424, Unknown=0, NotChecked=0, Total=4830 [2020-07-21 11:42:10,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2020-07-21 11:42:10,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 206. [2020-07-21 11:42:10,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2020-07-21 11:42:10,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 226 transitions. [2020-07-21 11:42:10,709 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 226 transitions. Word has length 270 [2020-07-21 11:42:10,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:42:10,710 INFO L479 AbstractCegarLoop]: Abstraction has 206 states and 226 transitions. [2020-07-21 11:42:10,710 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-07-21 11:42:10,711 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 226 transitions. [2020-07-21 11:42:10,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 284 [2020-07-21 11:42:10,713 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:42:10,713 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] [2020-07-21 11:42:10,927 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:42:10,928 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:42:10,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:42:10,929 INFO L82 PathProgramCache]: Analyzing trace with hash -1857052987, now seen corresponding path program 20 times [2020-07-21 11:42:10,929 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:42:10,929 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1024967892] [2020-07-21 11:42:10,930 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 [2020-07-21 11:42:11,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:42:11,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 538 conjuncts, 49 conjunts are in the unsatisfiable core [2020-07-21 11:42:11,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:42:12,354 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:42:12,540 INFO L134 CoverageAnalysis]: Checked inductivity of 4372 backedges. 82 proven. 1010 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 11:42:12,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:42:12,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:42:12,945 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1024967892] [2020-07-21 11:42:12,945 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:42:12,945 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-07-21 11:42:12,946 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424054271] [2020-07-21 11:42:12,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-07-21 11:42:12,946 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:42:12,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-07-21 11:42:12,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=2226, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 11:42:12,948 INFO L87 Difference]: Start difference. First operand 206 states and 226 transitions. Second operand 47 states. [2020-07-21 11:42:16,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:42:16,267 INFO L93 Difference]: Finished difference Result 218 states and 239 transitions. [2020-07-21 11:42:16,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-07-21 11:42:16,271 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 283 [2020-07-21 11:42:16,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:42:16,273 INFO L225 Difference]: With dead ends: 218 [2020-07-21 11:42:16,273 INFO L226 Difference]: Without dead ends: 216 [2020-07-21 11:42:16,275 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 244 SyntacticMatches, 3 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1774 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=425, Invalid=4831, Unknown=0, NotChecked=0, Total=5256 [2020-07-21 11:42:16,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2020-07-21 11:42:16,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 215. [2020-07-21 11:42:16,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 215 states. [2020-07-21 11:42:16,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 236 transitions. [2020-07-21 11:42:16,301 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 236 transitions. Word has length 283 [2020-07-21 11:42:16,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:42:16,302 INFO L479 AbstractCegarLoop]: Abstraction has 215 states and 236 transitions. [2020-07-21 11:42:16,302 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-07-21 11:42:16,302 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 236 transitions. [2020-07-21 11:42:16,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2020-07-21 11:42:16,304 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:42:16,304 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] [2020-07-21 11:42:16,517 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:42:16,517 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:42:16,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:42:16,518 INFO L82 PathProgramCache]: Analyzing trace with hash 1655603981, now seen corresponding path program 21 times [2020-07-21 11:42:16,518 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:42:16,519 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [871679843] [2020-07-21 11:42:16,519 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 [2020-07-21 11:42:16,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:42:16,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 562 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-21 11:42:16,616 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:42:18,335 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:42:18,541 INFO L134 CoverageAnalysis]: Checked inductivity of 4811 backedges. 86 proven. 1113 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 11:42:18,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:42:18,632 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:42:18,972 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [871679843] [2020-07-21 11:42:18,973 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:42:18,973 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-07-21 11:42:18,973 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068357731] [2020-07-21 11:42:18,974 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-07-21 11:42:18,974 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:42:18,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-07-21 11:42:18,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=2418, Unknown=0, NotChecked=0, Total=2652 [2020-07-21 11:42:18,976 INFO L87 Difference]: Start difference. First operand 215 states and 236 transitions. Second operand 49 states. [2020-07-21 11:42:23,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:42:23,201 INFO L93 Difference]: Finished difference Result 227 states and 249 transitions. [2020-07-21 11:42:23,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2020-07-21 11:42:23,202 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 296 [2020-07-21 11:42:23,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:42:23,205 INFO L225 Difference]: With dead ends: 227 [2020-07-21 11:42:23,205 INFO L226 Difference]: Without dead ends: 225 [2020-07-21 11:42:23,207 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 255 SyntacticMatches, 3 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1936 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=444, Invalid=5256, Unknown=0, NotChecked=0, Total=5700 [2020-07-21 11:42:23,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2020-07-21 11:42:23,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 224. [2020-07-21 11:42:23,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2020-07-21 11:42:23,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 246 transitions. [2020-07-21 11:42:23,228 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 246 transitions. Word has length 296 [2020-07-21 11:42:23,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:42:23,228 INFO L479 AbstractCegarLoop]: Abstraction has 224 states and 246 transitions. [2020-07-21 11:42:23,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-07-21 11:42:23,229 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 246 transitions. [2020-07-21 11:42:23,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2020-07-21 11:42:23,231 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:42:23,232 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] [2020-07-21 11:42:23,445 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:42:23,446 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:42:23,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:42:23,447 INFO L82 PathProgramCache]: Analyzing trace with hash 1208144837, now seen corresponding path program 22 times [2020-07-21 11:42:23,447 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:42:23,448 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [35935963] [2020-07-21 11:42:23,448 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 [2020-07-21 11:42:23,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:42:23,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 586 conjuncts, 53 conjunts are in the unsatisfiable core [2020-07-21 11:42:23,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:42:25,193 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:42:25,430 INFO L134 CoverageAnalysis]: Checked inductivity of 5271 backedges. 90 proven. 1221 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 11:42:25,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:42:25,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:42:25,900 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [35935963] [2020-07-21 11:42:25,901 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:42:25,901 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-07-21 11:42:25,901 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538779020] [2020-07-21 11:42:25,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-07-21 11:42:25,902 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:42:25,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-07-21 11:42:25,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=244, Invalid=2618, Unknown=0, NotChecked=0, Total=2862 [2020-07-21 11:42:25,903 INFO L87 Difference]: Start difference. First operand 224 states and 246 transitions. Second operand 51 states. [2020-07-21 11:42:30,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:42:30,039 INFO L93 Difference]: Finished difference Result 236 states and 259 transitions. [2020-07-21 11:42:30,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2020-07-21 11:42:30,040 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 309 [2020-07-21 11:42:30,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:42:30,042 INFO L225 Difference]: With dead ends: 236 [2020-07-21 11:42:30,042 INFO L226 Difference]: Without dead ends: 234 [2020-07-21 11:42:30,043 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 266 SyntacticMatches, 3 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2105 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=463, Invalid=5699, Unknown=0, NotChecked=0, Total=6162 [2020-07-21 11:42:30,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2020-07-21 11:42:30,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 233. [2020-07-21 11:42:30,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 233 states. [2020-07-21 11:42:30,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 256 transitions. [2020-07-21 11:42:30,064 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 256 transitions. Word has length 309 [2020-07-21 11:42:30,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:42:30,065 INFO L479 AbstractCegarLoop]: Abstraction has 233 states and 256 transitions. [2020-07-21 11:42:30,065 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-07-21 11:42:30,065 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 256 transitions. [2020-07-21 11:42:30,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2020-07-21 11:42:30,068 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:42:30,068 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] [2020-07-21 11:42:30,281 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:42:30,282 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:42:30,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:42:30,283 INFO L82 PathProgramCache]: Analyzing trace with hash 1369009677, now seen corresponding path program 23 times [2020-07-21 11:42:30,283 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:42:30,284 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [333515919] [2020-07-21 11:42:30,284 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 [2020-07-21 11:42:30,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:42:30,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 610 conjuncts, 55 conjunts are in the unsatisfiable core [2020-07-21 11:42:30,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:42:32,153 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:42:32,418 INFO L134 CoverageAnalysis]: Checked inductivity of 5752 backedges. 94 proven. 1334 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 11:42:32,419 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:42:32,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:42:32,909 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [333515919] [2020-07-21 11:42:32,909 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:42:32,910 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-07-21 11:42:32,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377321301] [2020-07-21 11:42:32,911 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-07-21 11:42:32,911 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:42:32,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-07-21 11:42:32,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=2826, Unknown=0, NotChecked=0, Total=3080 [2020-07-21 11:42:32,912 INFO L87 Difference]: Start difference. First operand 233 states and 256 transitions. Second operand 53 states. [2020-07-21 11:42:37,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:42:37,676 INFO L93 Difference]: Finished difference Result 245 states and 269 transitions. [2020-07-21 11:42:37,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2020-07-21 11:42:37,678 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 322 [2020-07-21 11:42:37,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:42:37,680 INFO L225 Difference]: With dead ends: 245 [2020-07-21 11:42:37,681 INFO L226 Difference]: Without dead ends: 243 [2020-07-21 11:42:37,682 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 277 SyntacticMatches, 3 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2281 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=482, Invalid=6160, Unknown=0, NotChecked=0, Total=6642 [2020-07-21 11:42:37,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2020-07-21 11:42:37,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 242. [2020-07-21 11:42:37,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 242 states. [2020-07-21 11:42:37,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 266 transitions. [2020-07-21 11:42:37,704 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 266 transitions. Word has length 322 [2020-07-21 11:42:37,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:42:37,705 INFO L479 AbstractCegarLoop]: Abstraction has 242 states and 266 transitions. [2020-07-21 11:42:37,705 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-07-21 11:42:37,705 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 266 transitions. [2020-07-21 11:42:37,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2020-07-21 11:42:37,708 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:42:37,708 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] [2020-07-21 11:42:37,923 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:42:37,924 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:42:37,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:42:37,925 INFO L82 PathProgramCache]: Analyzing trace with hash -43136827, now seen corresponding path program 24 times [2020-07-21 11:42:37,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:42:37,926 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [909852568] [2020-07-21 11:42:37,926 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 [2020-07-21 11:42:38,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:42:38,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 634 conjuncts, 57 conjunts are in the unsatisfiable core [2020-07-21 11:42:38,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:42:40,060 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:42:40,336 INFO L134 CoverageAnalysis]: Checked inductivity of 6254 backedges. 98 proven. 1452 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-21 11:42:40,337 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:42:40,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:42:40,883 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [909852568] [2020-07-21 11:42:40,883 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:42:40,883 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-07-21 11:42:40,884 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45706693] [2020-07-21 11:42:40,884 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-07-21 11:42:40,885 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:42:40,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-07-21 11:42:40,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=3042, Unknown=0, NotChecked=0, Total=3306 [2020-07-21 11:42:40,886 INFO L87 Difference]: Start difference. First operand 242 states and 266 transitions. Second operand 55 states. [2020-07-21 11:42:45,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:42:45,944 INFO L93 Difference]: Finished difference Result 254 states and 279 transitions. [2020-07-21 11:42:45,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2020-07-21 11:42:45,949 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 335 [2020-07-21 11:42:45,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:42:45,951 INFO L225 Difference]: With dead ends: 254 [2020-07-21 11:42:45,952 INFO L226 Difference]: Without dead ends: 252 [2020-07-21 11:42:45,953 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 374 GetRequests, 288 SyntacticMatches, 3 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2464 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=501, Invalid=6639, Unknown=0, NotChecked=0, Total=7140 [2020-07-21 11:42:45,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2020-07-21 11:42:45,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 251. [2020-07-21 11:42:45,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 251 states. [2020-07-21 11:42:45,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 276 transitions. [2020-07-21 11:42:45,975 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 276 transitions. Word has length 335 [2020-07-21 11:42:45,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:42:45,976 INFO L479 AbstractCegarLoop]: Abstraction has 251 states and 276 transitions. [2020-07-21 11:42:45,976 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-07-21 11:42:45,976 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 276 transitions. [2020-07-21 11:42:45,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 349 [2020-07-21 11:42:45,979 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:42:45,979 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] [2020-07-21 11:42:46,194 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:42:46,195 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:42:46,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:42:46,196 INFO L82 PathProgramCache]: Analyzing trace with hash 2053413133, now seen corresponding path program 25 times [2020-07-21 11:42:46,197 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:42:46,197 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1362879204] [2020-07-21 11:42:46,198 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 [2020-07-21 11:42:46,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:42:46,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 658 conjuncts, 59 conjunts are in the unsatisfiable core [2020-07-21 11:42:46,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:42:48,569 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:42:48,871 INFO L134 CoverageAnalysis]: Checked inductivity of 6777 backedges. 102 proven. 1575 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-21 11:42:48,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:42:48,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:42:49,450 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1362879204] [2020-07-21 11:42:49,451 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:42:49,451 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-07-21 11:42:49,451 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459941731] [2020-07-21 11:42:49,452 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-07-21 11:42:49,452 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:42:49,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-07-21 11:42:49,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=3266, Unknown=0, NotChecked=0, Total=3540 [2020-07-21 11:42:49,454 INFO L87 Difference]: Start difference. First operand 251 states and 276 transitions. Second operand 57 states. [2020-07-21 11:42:55,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:42:55,271 INFO L93 Difference]: Finished difference Result 263 states and 289 transitions. [2020-07-21 11:42:55,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2020-07-21 11:42:55,272 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 348 [2020-07-21 11:42:55,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:42:55,274 INFO L225 Difference]: With dead ends: 263 [2020-07-21 11:42:55,274 INFO L226 Difference]: Without dead ends: 261 [2020-07-21 11:42:55,278 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 299 SyntacticMatches, 3 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2654 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=520, Invalid=7136, Unknown=0, NotChecked=0, Total=7656 [2020-07-21 11:42:55,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2020-07-21 11:42:55,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 260. [2020-07-21 11:42:55,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 260 states. [2020-07-21 11:42:55,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 286 transitions. [2020-07-21 11:42:55,304 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 286 transitions. Word has length 348 [2020-07-21 11:42:55,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:42:55,304 INFO L479 AbstractCegarLoop]: Abstraction has 260 states and 286 transitions. [2020-07-21 11:42:55,305 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-07-21 11:42:55,305 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 286 transitions. [2020-07-21 11:42:55,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 362 [2020-07-21 11:42:55,308 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:42:55,308 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] [2020-07-21 11:42:55,522 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:42:55,523 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:42:55,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:42:55,523 INFO L82 PathProgramCache]: Analyzing trace with hash -144671291, now seen corresponding path program 26 times [2020-07-21 11:42:55,523 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:42:55,524 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [739830771] [2020-07-21 11:42:55,524 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 [2020-07-21 11:42:55,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:42:55,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 682 conjuncts, 61 conjunts are in the unsatisfiable core [2020-07-21 11:42:55,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:42:58,113 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:42:58,441 INFO L134 CoverageAnalysis]: Checked inductivity of 7321 backedges. 106 proven. 1703 refuted. 0 times theorem prover too weak. 5512 trivial. 0 not checked. [2020-07-21 11:42:58,441 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:42:58,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:42:59,085 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [739830771] [2020-07-21 11:42:59,086 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:42:59,086 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2020-07-21 11:42:59,086 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [461616934] [2020-07-21 11:42:59,087 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-07-21 11:42:59,087 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:42:59,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-07-21 11:42:59,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=284, Invalid=3498, Unknown=0, NotChecked=0, Total=3782 [2020-07-21 11:42:59,088 INFO L87 Difference]: Start difference. First operand 260 states and 286 transitions. Second operand 59 states. [2020-07-21 11:43:05,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:43:05,684 INFO L93 Difference]: Finished difference Result 272 states and 299 transitions. [2020-07-21 11:43:05,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2020-07-21 11:43:05,686 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 361 [2020-07-21 11:43:05,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:43:05,690 INFO L225 Difference]: With dead ends: 272 [2020-07-21 11:43:05,690 INFO L226 Difference]: Without dead ends: 270 [2020-07-21 11:43:05,692 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 310 SyntacticMatches, 3 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2851 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=539, Invalid=7651, Unknown=0, NotChecked=0, Total=8190 [2020-07-21 11:43:05,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2020-07-21 11:43:05,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 269. [2020-07-21 11:43:05,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 269 states. [2020-07-21 11:43:05,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 296 transitions. [2020-07-21 11:43:05,716 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 296 transitions. Word has length 361 [2020-07-21 11:43:05,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:43:05,717 INFO L479 AbstractCegarLoop]: Abstraction has 269 states and 296 transitions. [2020-07-21 11:43:05,717 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-07-21 11:43:05,717 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 296 transitions. [2020-07-21 11:43:05,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 375 [2020-07-21 11:43:05,720 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:43:05,721 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] [2020-07-21 11:43:05,933 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:43:05,934 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:43:05,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:43:05,934 INFO L82 PathProgramCache]: Analyzing trace with hash -1992293363, now seen corresponding path program 27 times [2020-07-21 11:43:05,934 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:43:05,935 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1004352048] [2020-07-21 11:43:05,935 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 [2020-07-21 11:43:06,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:43:06,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 706 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-21 11:43:06,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:43:09,361 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:43:09,690 INFO L134 CoverageAnalysis]: Checked inductivity of 7886 backedges. 110 proven. 1836 refuted. 0 times theorem prover too weak. 5940 trivial. 0 not checked. [2020-07-21 11:43:09,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:43:09,851 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:43:10,383 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1004352048] [2020-07-21 11:43:10,384 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:43:10,384 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2020-07-21 11:43:10,384 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489040830] [2020-07-21 11:43:10,385 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-07-21 11:43:10,385 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:43:10,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-07-21 11:43:10,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=3738, Unknown=0, NotChecked=0, Total=4032 [2020-07-21 11:43:10,386 INFO L87 Difference]: Start difference. First operand 269 states and 296 transitions. Second operand 61 states. [2020-07-21 11:43:18,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:43:18,270 INFO L93 Difference]: Finished difference Result 281 states and 309 transitions. [2020-07-21 11:43:18,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2020-07-21 11:43:18,272 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 374 [2020-07-21 11:43:18,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:43:18,274 INFO L225 Difference]: With dead ends: 281 [2020-07-21 11:43:18,275 INFO L226 Difference]: Without dead ends: 279 [2020-07-21 11:43:18,276 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 321 SyntacticMatches, 3 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3055 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=558, Invalid=8184, Unknown=0, NotChecked=0, Total=8742 [2020-07-21 11:43:18,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2020-07-21 11:43:18,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 278. [2020-07-21 11:43:18,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 278 states. [2020-07-21 11:43:18,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 306 transitions. [2020-07-21 11:43:18,301 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 306 transitions. Word has length 374 [2020-07-21 11:43:18,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:43:18,302 INFO L479 AbstractCegarLoop]: Abstraction has 278 states and 306 transitions. [2020-07-21 11:43:18,302 INFO L480 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-07-21 11:43:18,302 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 306 transitions. [2020-07-21 11:43:18,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 388 [2020-07-21 11:43:18,306 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:43:18,306 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] [2020-07-21 11:43:18,520 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:43:18,521 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:43:18,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:43:18,522 INFO L82 PathProgramCache]: Analyzing trace with hash -676662587, now seen corresponding path program 28 times [2020-07-21 11:43:18,522 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:43:18,523 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1629324000] [2020-07-21 11:43:18,523 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 [2020-07-21 11:43:18,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:43:18,638 INFO L263 TraceCheckSpWp]: Trace formula consists of 730 conjuncts, 65 conjunts are in the unsatisfiable core [2020-07-21 11:43:18,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:43:21,771 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:43:22,156 INFO L134 CoverageAnalysis]: Checked inductivity of 8472 backedges. 114 proven. 1974 refuted. 0 times theorem prover too weak. 6384 trivial. 0 not checked. [2020-07-21 11:43:22,156 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:43:22,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:43:22,893 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1629324000] [2020-07-21 11:43:22,893 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:43:22,893 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63] total 63 [2020-07-21 11:43:22,893 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1028264724] [2020-07-21 11:43:22,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2020-07-21 11:43:22,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:43:22,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2020-07-21 11:43:22,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=3986, Unknown=0, NotChecked=0, Total=4290 [2020-07-21 11:43:22,896 INFO L87 Difference]: Start difference. First operand 278 states and 306 transitions. Second operand 63 states. [2020-07-21 11:43:31,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:43:31,577 INFO L93 Difference]: Finished difference Result 290 states and 319 transitions. [2020-07-21 11:43:31,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2020-07-21 11:43:31,579 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 387 [2020-07-21 11:43:31,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:43:31,582 INFO L225 Difference]: With dead ends: 290 [2020-07-21 11:43:31,582 INFO L226 Difference]: Without dead ends: 288 [2020-07-21 11:43:31,583 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 332 SyntacticMatches, 3 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3266 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=577, Invalid=8735, Unknown=0, NotChecked=0, Total=9312 [2020-07-21 11:43:31,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2020-07-21 11:43:31,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 287. [2020-07-21 11:43:31,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 287 states. [2020-07-21 11:43:31,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 316 transitions. [2020-07-21 11:43:31,607 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 316 transitions. Word has length 387 [2020-07-21 11:43:31,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:43:31,608 INFO L479 AbstractCegarLoop]: Abstraction has 287 states and 316 transitions. [2020-07-21 11:43:31,608 INFO L480 AbstractCegarLoop]: Interpolant automaton has 63 states. [2020-07-21 11:43:31,608 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 316 transitions. [2020-07-21 11:43:31,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 401 [2020-07-21 11:43:31,610 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:43:31,610 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] [2020-07-21 11:43:31,811 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:43:31,812 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:43:31,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:43:31,812 INFO L82 PathProgramCache]: Analyzing trace with hash 1314631437, now seen corresponding path program 29 times [2020-07-21 11:43:31,813 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:43:31,813 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1745105362] [2020-07-21 11:43:31,813 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 [2020-07-21 11:43:31,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:43:31,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 754 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-21 11:43:31,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:43:35,474 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:43:35,887 INFO L134 CoverageAnalysis]: Checked inductivity of 9079 backedges. 118 proven. 2117 refuted. 0 times theorem prover too weak. 6844 trivial. 0 not checked. [2020-07-21 11:43:35,888 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:43:36,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:43:36,701 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1745105362] [2020-07-21 11:43:36,702 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:43:36,702 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65] total 65 [2020-07-21 11:43:36,702 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032348860] [2020-07-21 11:43:36,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2020-07-21 11:43:36,703 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:43:36,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2020-07-21 11:43:36,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=4242, Unknown=0, NotChecked=0, Total=4556 [2020-07-21 11:43:36,705 INFO L87 Difference]: Start difference. First operand 287 states and 316 transitions. Second operand 65 states. [2020-07-21 11:43:46,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:43:46,802 INFO L93 Difference]: Finished difference Result 299 states and 329 transitions. [2020-07-21 11:43:46,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2020-07-21 11:43:46,804 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 400 [2020-07-21 11:43:46,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:43:46,808 INFO L225 Difference]: With dead ends: 299 [2020-07-21 11:43:46,809 INFO L226 Difference]: Without dead ends: 297 [2020-07-21 11:43:46,810 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 343 SyntacticMatches, 3 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3484 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=596, Invalid=9304, Unknown=0, NotChecked=0, Total=9900 [2020-07-21 11:43:46,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2020-07-21 11:43:46,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 296. [2020-07-21 11:43:46,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 296 states. [2020-07-21 11:43:46,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 326 transitions. [2020-07-21 11:43:46,835 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 326 transitions. Word has length 400 [2020-07-21 11:43:46,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:43:46,836 INFO L479 AbstractCegarLoop]: Abstraction has 296 states and 326 transitions. [2020-07-21 11:43:46,836 INFO L480 AbstractCegarLoop]: Interpolant automaton has 65 states. [2020-07-21 11:43:46,837 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 326 transitions. [2020-07-21 11:43:46,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 414 [2020-07-21 11:43:46,840 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:43:46,841 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] [2020-07-21 11:43:47,054 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:43:47,055 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:43:47,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:43:47,055 INFO L82 PathProgramCache]: Analyzing trace with hash -1675810875, now seen corresponding path program 30 times [2020-07-21 11:43:47,055 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:43:47,056 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [527328444] [2020-07-21 11:43:47,056 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 [2020-07-21 11:43:47,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:43:47,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 778 conjuncts, 69 conjunts are in the unsatisfiable core [2020-07-21 11:43:47,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:43:50,977 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:43:51,430 INFO L134 CoverageAnalysis]: Checked inductivity of 9707 backedges. 122 proven. 2265 refuted. 0 times theorem prover too weak. 7320 trivial. 0 not checked. [2020-07-21 11:43:51,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:43:51,675 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:43:52,409 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [527328444] [2020-07-21 11:43:52,410 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:43:52,410 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67] total 67 [2020-07-21 11:43:52,411 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100770590] [2020-07-21 11:43:52,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2020-07-21 11:43:52,411 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:43:52,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2020-07-21 11:43:52,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=4506, Unknown=0, NotChecked=0, Total=4830 [2020-07-21 11:43:52,412 INFO L87 Difference]: Start difference. First operand 296 states and 326 transitions. Second operand 67 states. [2020-07-21 11:44:03,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:03,908 INFO L93 Difference]: Finished difference Result 308 states and 339 transitions. [2020-07-21 11:44:03,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2020-07-21 11:44:03,910 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 413 [2020-07-21 11:44:03,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:03,913 INFO L225 Difference]: With dead ends: 308 [2020-07-21 11:44:03,913 INFO L226 Difference]: Without dead ends: 306 [2020-07-21 11:44:03,915 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 354 SyntacticMatches, 3 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3709 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=615, Invalid=9891, Unknown=0, NotChecked=0, Total=10506 [2020-07-21 11:44:03,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2020-07-21 11:44:03,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 305. [2020-07-21 11:44:03,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 305 states. [2020-07-21 11:44:03,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 336 transitions. [2020-07-21 11:44:03,938 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 336 transitions. Word has length 413 [2020-07-21 11:44:03,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:03,939 INFO L479 AbstractCegarLoop]: Abstraction has 305 states and 336 transitions. [2020-07-21 11:44:03,939 INFO L480 AbstractCegarLoop]: Interpolant automaton has 67 states. [2020-07-21 11:44:03,939 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 336 transitions. [2020-07-21 11:44:03,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 427 [2020-07-21 11:44:03,943 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:03,944 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] [2020-07-21 11:44:04,147 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:04,148 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:04,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:04,149 INFO L82 PathProgramCache]: Analyzing trace with hash -1108895219, now seen corresponding path program 31 times [2020-07-21 11:44:04,149 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:04,149 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1199910254] [2020-07-21 11:44:04,149 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 [2020-07-21 11:44:04,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:04,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 802 conjuncts, 71 conjunts are in the unsatisfiable core [2020-07-21 11:44:04,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:08,522 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:44:09,005 INFO L134 CoverageAnalysis]: Checked inductivity of 10356 backedges. 126 proven. 2418 refuted. 0 times theorem prover too weak. 7812 trivial. 0 not checked. [2020-07-21 11:44:09,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:09,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:44:10,023 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1199910254] [2020-07-21 11:44:10,023 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:44:10,024 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69] total 69 [2020-07-21 11:44:10,024 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469400561] [2020-07-21 11:44:10,025 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2020-07-21 11:44:10,025 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:10,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2020-07-21 11:44:10,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=334, Invalid=4778, Unknown=0, NotChecked=0, Total=5112 [2020-07-21 11:44:10,027 INFO L87 Difference]: Start difference. First operand 305 states and 336 transitions. Second operand 69 states. [2020-07-21 11:44:23,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:23,404 INFO L93 Difference]: Finished difference Result 317 states and 349 transitions. [2020-07-21 11:44:23,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2020-07-21 11:44:23,406 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 426 [2020-07-21 11:44:23,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:23,408 INFO L225 Difference]: With dead ends: 317 [2020-07-21 11:44:23,409 INFO L226 Difference]: Without dead ends: 315 [2020-07-21 11:44:23,410 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 472 GetRequests, 365 SyntacticMatches, 3 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3941 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=634, Invalid=10496, Unknown=0, NotChecked=0, Total=11130 [2020-07-21 11:44:23,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2020-07-21 11:44:23,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 314. [2020-07-21 11:44:23,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 314 states. [2020-07-21 11:44:23,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 314 states to 314 states and 346 transitions. [2020-07-21 11:44:23,459 INFO L78 Accepts]: Start accepts. Automaton has 314 states and 346 transitions. Word has length 426 [2020-07-21 11:44:23,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:23,460 INFO L479 AbstractCegarLoop]: Abstraction has 314 states and 346 transitions. [2020-07-21 11:44:23,460 INFO L480 AbstractCegarLoop]: Interpolant automaton has 69 states. [2020-07-21 11:44:23,460 INFO L276 IsEmpty]: Start isEmpty. Operand 314 states and 346 transitions. [2020-07-21 11:44:23,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 440 [2020-07-21 11:44:23,464 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:23,465 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] [2020-07-21 11:44:23,677 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:23,678 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:23,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:23,679 INFO L82 PathProgramCache]: Analyzing trace with hash -1635312443, now seen corresponding path program 32 times [2020-07-21 11:44:23,679 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:23,680 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [82062300] [2020-07-21 11:44:23,680 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 [2020-07-21 11:44:23,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:23,812 INFO L263 TraceCheckSpWp]: Trace formula consists of 826 conjuncts, 73 conjunts are in the unsatisfiable core [2020-07-21 11:44:23,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:28,521 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:44:29,039 INFO L134 CoverageAnalysis]: Checked inductivity of 11026 backedges. 130 proven. 2576 refuted. 0 times theorem prover too weak. 8320 trivial. 0 not checked. [2020-07-21 11:44:29,040 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:29,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:44:30,095 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [82062300] [2020-07-21 11:44:30,095 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:44:30,096 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71] total 71 [2020-07-21 11:44:30,096 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2125346579] [2020-07-21 11:44:30,097 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2020-07-21 11:44:30,097 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:30,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2020-07-21 11:44:30,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=344, Invalid=5058, Unknown=0, NotChecked=0, Total=5402 [2020-07-21 11:44:30,098 INFO L87 Difference]: Start difference. First operand 314 states and 346 transitions. Second operand 71 states. [2020-07-21 11:44:45,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:45,336 INFO L93 Difference]: Finished difference Result 326 states and 359 transitions. [2020-07-21 11:44:45,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2020-07-21 11:44:45,339 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 439 [2020-07-21 11:44:45,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:45,342 INFO L225 Difference]: With dead ends: 326 [2020-07-21 11:44:45,342 INFO L226 Difference]: Without dead ends: 324 [2020-07-21 11:44:45,344 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 376 SyntacticMatches, 3 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4180 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=653, Invalid=11119, Unknown=0, NotChecked=0, Total=11772 [2020-07-21 11:44:45,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 324 states. [2020-07-21 11:44:45,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 324 to 323. [2020-07-21 11:44:45,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 323 states. [2020-07-21 11:44:45,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 356 transitions. [2020-07-21 11:44:45,374 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 356 transitions. Word has length 439 [2020-07-21 11:44:45,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:45,375 INFO L479 AbstractCegarLoop]: Abstraction has 323 states and 356 transitions. [2020-07-21 11:44:45,375 INFO L480 AbstractCegarLoop]: Interpolant automaton has 71 states. [2020-07-21 11:44:45,375 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 356 transitions. [2020-07-21 11:44:45,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 453 [2020-07-21 11:44:45,380 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:45,380 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] [2020-07-21 11:44:45,593 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:45,594 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:45,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:45,594 INFO L82 PathProgramCache]: Analyzing trace with hash -267139827, now seen corresponding path program 33 times [2020-07-21 11:44:45,594 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:45,595 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [788641679] [2020-07-21 11:44:45,595 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 [2020-07-21 11:44:45,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:45,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 850 conjuncts, 75 conjunts are in the unsatisfiable core [2020-07-21 11:44:45,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:50,928 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:44:51,500 INFO L134 CoverageAnalysis]: Checked inductivity of 11717 backedges. 134 proven. 2739 refuted. 0 times theorem prover too weak. 8844 trivial. 0 not checked. [2020-07-21 11:44:51,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:51,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:44:52,655 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [788641679] [2020-07-21 11:44:52,655 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:44:52,656 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73] total 73 [2020-07-21 11:44:52,656 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032301281] [2020-07-21 11:44:52,657 INFO L459 AbstractCegarLoop]: Interpolant automaton has 73 states [2020-07-21 11:44:52,657 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:52,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2020-07-21 11:44:52,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=354, Invalid=5346, Unknown=0, NotChecked=0, Total=5700 [2020-07-21 11:44:52,658 INFO L87 Difference]: Start difference. First operand 323 states and 356 transitions. Second operand 73 states. [2020-07-21 11:45:09,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:09,995 INFO L93 Difference]: Finished difference Result 335 states and 369 transitions. [2020-07-21 11:45:09,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2020-07-21 11:45:09,998 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 452 [2020-07-21 11:45:09,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:10,002 INFO L225 Difference]: With dead ends: 335 [2020-07-21 11:45:10,002 INFO L226 Difference]: Without dead ends: 333 [2020-07-21 11:45:10,004 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 387 SyntacticMatches, 3 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4426 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=672, Invalid=11760, Unknown=0, NotChecked=0, Total=12432 [2020-07-21 11:45:10,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2020-07-21 11:45:10,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 332. [2020-07-21 11:45:10,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 332 states. [2020-07-21 11:45:10,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 366 transitions. [2020-07-21 11:45:10,037 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 366 transitions. Word has length 452 [2020-07-21 11:45:10,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:10,038 INFO L479 AbstractCegarLoop]: Abstraction has 332 states and 366 transitions. [2020-07-21 11:45:10,038 INFO L480 AbstractCegarLoop]: Interpolant automaton has 73 states. [2020-07-21 11:45:10,039 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 366 transitions. [2020-07-21 11:45:10,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 466 [2020-07-21 11:45:10,043 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:10,043 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] [2020-07-21 11:45:10,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:10,257 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:10,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:10,258 INFO L82 PathProgramCache]: Analyzing trace with hash -1799827003, now seen corresponding path program 34 times [2020-07-21 11:45:10,258 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:10,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [767604882] [2020-07-21 11:45:10,259 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 [2020-07-21 11:45:10,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:10,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 874 conjuncts, 77 conjunts are in the unsatisfiable core [2020-07-21 11:45:10,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:16,131 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:45:16,751 INFO L134 CoverageAnalysis]: Checked inductivity of 12429 backedges. 138 proven. 2907 refuted. 0 times theorem prover too weak. 9384 trivial. 0 not checked. [2020-07-21 11:45:16,751 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:17,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:45:17,990 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [767604882] [2020-07-21 11:45:17,991 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:45:17,991 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75] total 75 [2020-07-21 11:45:17,991 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936678789] [2020-07-21 11:45:17,992 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2020-07-21 11:45:17,992 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:17,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2020-07-21 11:45:17,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=5642, Unknown=0, NotChecked=0, Total=6006 [2020-07-21 11:45:17,993 INFO L87 Difference]: Start difference. First operand 332 states and 366 transitions. Second operand 75 states. [2020-07-21 11:45:38,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:38,108 INFO L93 Difference]: Finished difference Result 344 states and 379 transitions. [2020-07-21 11:45:38,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2020-07-21 11:45:38,112 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 465 [2020-07-21 11:45:38,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:38,115 INFO L225 Difference]: With dead ends: 344 [2020-07-21 11:45:38,115 INFO L226 Difference]: Without dead ends: 342 [2020-07-21 11:45:38,116 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 398 SyntacticMatches, 3 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4679 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=691, Invalid=12419, Unknown=0, NotChecked=0, Total=13110 [2020-07-21 11:45:38,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2020-07-21 11:45:38,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 341. [2020-07-21 11:45:38,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 341 states. [2020-07-21 11:45:38,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 376 transitions. [2020-07-21 11:45:38,151 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 376 transitions. Word has length 465 [2020-07-21 11:45:38,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:38,152 INFO L479 AbstractCegarLoop]: Abstraction has 341 states and 376 transitions. [2020-07-21 11:45:38,152 INFO L480 AbstractCegarLoop]: Interpolant automaton has 75 states. [2020-07-21 11:45:38,152 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 376 transitions. [2020-07-21 11:45:38,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 479 [2020-07-21 11:45:38,156 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:38,157 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] [2020-07-21 11:45:38,372 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:38,373 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:38,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:38,374 INFO L82 PathProgramCache]: Analyzing trace with hash 554709005, now seen corresponding path program 35 times [2020-07-21 11:45:38,374 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:38,375 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1243523862] [2020-07-21 11:45:38,375 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 [2020-07-21 11:45:38,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:38,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 898 conjuncts, 79 conjunts are in the unsatisfiable core [2020-07-21 11:45:38,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:44,972 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:45:45,626 INFO L134 CoverageAnalysis]: Checked inductivity of 13162 backedges. 142 proven. 3080 refuted. 0 times theorem prover too weak. 9940 trivial. 0 not checked. [2020-07-21 11:45:45,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:45,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:45:47,000 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1243523862] [2020-07-21 11:45:47,000 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:45:47,001 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [77] total 77 [2020-07-21 11:45:47,001 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1516350974] [2020-07-21 11:45:47,002 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2020-07-21 11:45:47,002 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:47,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2020-07-21 11:45:47,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=374, Invalid=5946, Unknown=0, NotChecked=0, Total=6320 [2020-07-21 11:45:47,003 INFO L87 Difference]: Start difference. First operand 341 states and 376 transitions. Second operand 77 states. [2020-07-21 11:46:09,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:46:09,513 INFO L93 Difference]: Finished difference Result 353 states and 389 transitions. [2020-07-21 11:46:09,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2020-07-21 11:46:09,516 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 478 [2020-07-21 11:46:09,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:46:09,520 INFO L225 Difference]: With dead ends: 353 [2020-07-21 11:46:09,520 INFO L226 Difference]: Without dead ends: 351 [2020-07-21 11:46:09,522 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 528 GetRequests, 409 SyntacticMatches, 3 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4939 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=710, Invalid=13096, Unknown=0, NotChecked=0, Total=13806 [2020-07-21 11:46:09,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 351 states. [2020-07-21 11:46:09,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 351 to 350. [2020-07-21 11:46:09,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 350 states. [2020-07-21 11:46:09,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 386 transitions. [2020-07-21 11:46:09,557 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 386 transitions. Word has length 478 [2020-07-21 11:46:09,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:46:09,558 INFO L479 AbstractCegarLoop]: Abstraction has 350 states and 386 transitions. [2020-07-21 11:46:09,558 INFO L480 AbstractCegarLoop]: Interpolant automaton has 77 states. [2020-07-21 11:46:09,558 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 386 transitions. [2020-07-21 11:46:09,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 492 [2020-07-21 11:46:09,563 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:46:09,563 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] [2020-07-21 11:46:09,773 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:09,774 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:46:09,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:46:09,775 INFO L82 PathProgramCache]: Analyzing trace with hash -1870510395, now seen corresponding path program 36 times [2020-07-21 11:46:09,775 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:46:09,776 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1114563937] [2020-07-21 11:46:09,776 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 [2020-07-21 11:46:09,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:46:09,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 922 conjuncts, 81 conjunts are in the unsatisfiable core [2020-07-21 11:46:09,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:46:16,920 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:46:17,617 INFO L134 CoverageAnalysis]: Checked inductivity of 13916 backedges. 146 proven. 3258 refuted. 0 times theorem prover too weak. 10512 trivial. 0 not checked. [2020-07-21 11:46:17,618 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:46:17,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:46:19,097 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1114563937] [2020-07-21 11:46:19,097 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:46:19,098 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [79] total 79 [2020-07-21 11:46:19,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071055217] [2020-07-21 11:46:19,099 INFO L459 AbstractCegarLoop]: Interpolant automaton has 79 states [2020-07-21 11:46:19,099 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:46:19,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2020-07-21 11:46:19,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=6258, Unknown=0, NotChecked=0, Total=6642 [2020-07-21 11:46:19,101 INFO L87 Difference]: Start difference. First operand 350 states and 386 transitions. Second operand 79 states. [2020-07-21 11:46:43,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:46:43,533 INFO L93 Difference]: Finished difference Result 362 states and 399 transitions. [2020-07-21 11:46:43,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2020-07-21 11:46:43,537 INFO L78 Accepts]: Start accepts. Automaton has 79 states. Word has length 491 [2020-07-21 11:46:43,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:46:43,540 INFO L225 Difference]: With dead ends: 362 [2020-07-21 11:46:43,540 INFO L226 Difference]: Without dead ends: 360 [2020-07-21 11:46:43,541 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 542 GetRequests, 420 SyntacticMatches, 3 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5206 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=729, Invalid=13791, Unknown=0, NotChecked=0, Total=14520 [2020-07-21 11:46:43,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2020-07-21 11:46:43,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 359. [2020-07-21 11:46:43,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 359 states. [2020-07-21 11:46:43,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 359 states to 359 states and 396 transitions. [2020-07-21 11:46:43,570 INFO L78 Accepts]: Start accepts. Automaton has 359 states and 396 transitions. Word has length 491 [2020-07-21 11:46:43,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:46:43,571 INFO L479 AbstractCegarLoop]: Abstraction has 359 states and 396 transitions. [2020-07-21 11:46:43,571 INFO L480 AbstractCegarLoop]: Interpolant automaton has 79 states. [2020-07-21 11:46:43,572 INFO L276 IsEmpty]: Start isEmpty. Operand 359 states and 396 transitions. [2020-07-21 11:46:43,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-21 11:46:43,576 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:46:43,577 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] [2020-07-21 11:46:43,792 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:43,793 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:46:43,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:46:43,793 INFO L82 PathProgramCache]: Analyzing trace with hash -1324557555, now seen corresponding path program 37 times [2020-07-21 11:46:43,793 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:46:43,794 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1733183527] [2020-07-21 11:46:43,794 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 [2020-07-21 11:46:43,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:46:43,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 946 conjuncts, 83 conjunts are in the unsatisfiable core [2020-07-21 11:46:43,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:46:51,699 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:46:52,454 INFO L134 CoverageAnalysis]: Checked inductivity of 14691 backedges. 150 proven. 3441 refuted. 0 times theorem prover too weak. 11100 trivial. 0 not checked. [2020-07-21 11:46:52,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:46:52,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:46:54,052 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1733183527] [2020-07-21 11:46:54,053 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:46:54,053 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [81] total 81 [2020-07-21 11:46:54,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985263655] [2020-07-21 11:46:54,054 INFO L459 AbstractCegarLoop]: Interpolant automaton has 81 states [2020-07-21 11:46:54,054 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:46:54,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2020-07-21 11:46:54,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=394, Invalid=6578, Unknown=0, NotChecked=0, Total=6972 [2020-07-21 11:46:54,055 INFO L87 Difference]: Start difference. First operand 359 states and 396 transitions. Second operand 81 states. [2020-07-21 11:47:20,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:47:20,106 INFO L93 Difference]: Finished difference Result 371 states and 409 transitions. [2020-07-21 11:47:20,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2020-07-21 11:47:20,110 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 504 [2020-07-21 11:47:20,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:47:20,113 INFO L225 Difference]: With dead ends: 371 [2020-07-21 11:47:20,113 INFO L226 Difference]: Without dead ends: 369 [2020-07-21 11:47:20,113 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 556 GetRequests, 431 SyntacticMatches, 3 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5480 ImplicationChecksByTransitivity, 14.2s TimeCoverageRelationStatistics Valid=748, Invalid=14504, Unknown=0, NotChecked=0, Total=15252 [2020-07-21 11:47:20,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2020-07-21 11:47:20,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 368. [2020-07-21 11:47:20,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2020-07-21 11:47:20,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 406 transitions. [2020-07-21 11:47:20,150 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 406 transitions. Word has length 504 [2020-07-21 11:47:20,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:47:20,151 INFO L479 AbstractCegarLoop]: Abstraction has 368 states and 406 transitions. [2020-07-21 11:47:20,151 INFO L480 AbstractCegarLoop]: Interpolant automaton has 81 states. [2020-07-21 11:47:20,151 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 406 transitions. [2020-07-21 11:47:20,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 518 [2020-07-21 11:47:20,155 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:47:20,155 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] [2020-07-21 11:47:20,370 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:20,371 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:47:20,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:47:20,371 INFO L82 PathProgramCache]: Analyzing trace with hash -5014587, now seen corresponding path program 38 times [2020-07-21 11:47:20,371 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:47:20,371 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1088684325] [2020-07-21 11:47:20,372 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 [2020-07-21 11:47:20,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:47:20,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 970 conjuncts, 85 conjunts are in the unsatisfiable core [2020-07-21 11:47:20,514 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:47:26,230 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:47:26,863 INFO L134 CoverageAnalysis]: Checked inductivity of 15487 backedges. 154 proven. 3629 refuted. 0 times theorem prover too weak. 11704 trivial. 0 not checked. [2020-07-21 11:47:26,864 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:47:27,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:47:28,012 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1088684325] [2020-07-21 11:47:28,013 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:47:28,013 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83] total 83 [2020-07-21 11:47:28,013 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010253753] [2020-07-21 11:47:28,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2020-07-21 11:47:28,014 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:47:28,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2020-07-21 11:47:28,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=6906, Unknown=0, NotChecked=0, Total=7310 [2020-07-21 11:47:28,014 INFO L87 Difference]: Start difference. First operand 368 states and 406 transitions. Second operand 83 states. [2020-07-21 11:47:51,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:47:51,781 INFO L93 Difference]: Finished difference Result 380 states and 419 transitions. [2020-07-21 11:47:51,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2020-07-21 11:47:51,785 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 517 [2020-07-21 11:47:51,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:47:51,788 INFO L225 Difference]: With dead ends: 380 [2020-07-21 11:47:51,788 INFO L226 Difference]: Without dead ends: 378 [2020-07-21 11:47:51,790 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 570 GetRequests, 442 SyntacticMatches, 3 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5761 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=767, Invalid=15235, Unknown=0, NotChecked=0, Total=16002 [2020-07-21 11:47:51,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2020-07-21 11:47:51,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 377. [2020-07-21 11:47:51,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 377 states. [2020-07-21 11:47:51,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 416 transitions. [2020-07-21 11:47:51,819 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 416 transitions. Word has length 517 [2020-07-21 11:47:51,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:47:51,820 INFO L479 AbstractCegarLoop]: Abstraction has 377 states and 416 transitions. [2020-07-21 11:47:51,820 INFO L480 AbstractCegarLoop]: Interpolant automaton has 83 states. [2020-07-21 11:47:51,820 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 416 transitions. [2020-07-21 11:47:51,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 531 [2020-07-21 11:47:51,824 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:47:51,825 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] [2020-07-21 11:47:52,032 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:52,033 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:47:52,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:47:52,034 INFO L82 PathProgramCache]: Analyzing trace with hash 607766029, now seen corresponding path program 39 times [2020-07-21 11:47:52,034 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:47:52,034 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [622335778] [2020-07-21 11:47:52,035 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 [2020-07-21 11:47:52,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:47:52,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 994 conjuncts, 87 conjunts are in the unsatisfiable core [2020-07-21 11:47:52,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:48:01,645 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:48:02,513 INFO L134 CoverageAnalysis]: Checked inductivity of 16304 backedges. 158 proven. 3822 refuted. 0 times theorem prover too weak. 12324 trivial. 0 not checked. [2020-07-21 11:48:02,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:48:02,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:48:04,432 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [622335778] [2020-07-21 11:48:04,433 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:48:04,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [85] total 85 [2020-07-21 11:48:04,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1840810914] [2020-07-21 11:48:04,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 85 states [2020-07-21 11:48:04,434 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:48:04,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2020-07-21 11:48:04,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=414, Invalid=7242, Unknown=0, NotChecked=0, Total=7656 [2020-07-21 11:48:04,435 INFO L87 Difference]: Start difference. First operand 377 states and 416 transitions. Second operand 85 states. [2020-07-21 11:48:39,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:48:39,710 INFO L93 Difference]: Finished difference Result 389 states and 429 transitions. [2020-07-21 11:48:39,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2020-07-21 11:48:39,715 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 530 [2020-07-21 11:48:39,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:48:39,718 INFO L225 Difference]: With dead ends: 389 [2020-07-21 11:48:39,718 INFO L226 Difference]: Without dead ends: 387 [2020-07-21 11:48:39,720 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 584 GetRequests, 453 SyntacticMatches, 3 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6049 ImplicationChecksByTransitivity, 17.9s TimeCoverageRelationStatistics Valid=786, Invalid=15984, Unknown=0, NotChecked=0, Total=16770 [2020-07-21 11:48:39,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2020-07-21 11:48:39,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 386. [2020-07-21 11:48:39,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 386 states. [2020-07-21 11:48:39,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 386 states to 386 states and 426 transitions. [2020-07-21 11:48:39,760 INFO L78 Accepts]: Start accepts. Automaton has 386 states and 426 transitions. Word has length 530 [2020-07-21 11:48:39,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:48:39,761 INFO L479 AbstractCegarLoop]: Abstraction has 386 states and 426 transitions. [2020-07-21 11:48:39,761 INFO L480 AbstractCegarLoop]: Interpolant automaton has 85 states. [2020-07-21 11:48:39,761 INFO L276 IsEmpty]: Start isEmpty. Operand 386 states and 426 transitions. [2020-07-21 11:48:39,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 544 [2020-07-21 11:48:39,765 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:48:39,766 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] [2020-07-21 11:48:39,966 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:48:39,967 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:48:39,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:48:39,968 INFO L82 PathProgramCache]: Analyzing trace with hash -1407422267, now seen corresponding path program 40 times [2020-07-21 11:48:39,968 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:48:39,969 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [676232813] [2020-07-21 11:48:39,969 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 [2020-07-21 11:48:40,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:48:40,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 1018 conjuncts, 89 conjunts are in the unsatisfiable core [2020-07-21 11:48:40,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:48:50,314 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:48:51,247 INFO L134 CoverageAnalysis]: Checked inductivity of 17142 backedges. 162 proven. 4020 refuted. 0 times theorem prover too weak. 12960 trivial. 0 not checked. [2020-07-21 11:48:51,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:48:51,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:48:53,324 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [676232813] [2020-07-21 11:48:53,324 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:48:53,324 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [87] total 87 [2020-07-21 11:48:53,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027332638] [2020-07-21 11:48:53,325 INFO L459 AbstractCegarLoop]: Interpolant automaton has 87 states [2020-07-21 11:48:53,325 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:48:53,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2020-07-21 11:48:53,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=424, Invalid=7586, Unknown=0, NotChecked=0, Total=8010 [2020-07-21 11:48:53,326 INFO L87 Difference]: Start difference. First operand 386 states and 426 transitions. Second operand 87 states. [2020-07-21 11:49:30,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:49:30,987 INFO L93 Difference]: Finished difference Result 398 states and 439 transitions. [2020-07-21 11:49:30,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2020-07-21 11:49:30,992 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 543 [2020-07-21 11:49:30,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:49:30,996 INFO L225 Difference]: With dead ends: 398 [2020-07-21 11:49:30,997 INFO L226 Difference]: Without dead ends: 396 [2020-07-21 11:49:30,999 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 598 GetRequests, 464 SyntacticMatches, 3 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6344 ImplicationChecksByTransitivity, 19.1s TimeCoverageRelationStatistics Valid=805, Invalid=16751, Unknown=0, NotChecked=0, Total=17556 [2020-07-21 11:49:30,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 396 states. [2020-07-21 11:49:31,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 396 to 395. [2020-07-21 11:49:31,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 395 states. [2020-07-21 11:49:31,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 436 transitions. [2020-07-21 11:49:31,052 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 436 transitions. Word has length 543 [2020-07-21 11:49:31,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:49:31,053 INFO L479 AbstractCegarLoop]: Abstraction has 395 states and 436 transitions. [2020-07-21 11:49:31,054 INFO L480 AbstractCegarLoop]: Interpolant automaton has 87 states. [2020-07-21 11:49:31,054 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 436 transitions. [2020-07-21 11:49:31,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 557 [2020-07-21 11:49:31,059 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:49:31,060 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] [2020-07-21 11:49:31,274 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:49:31,275 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:49:31,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:49:31,276 INFO L82 PathProgramCache]: Analyzing trace with hash 583463181, now seen corresponding path program 41 times [2020-07-21 11:49:31,276 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:49:31,277 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1543625399] [2020-07-21 11:49:31,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:49:31,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:49:31,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 1042 conjuncts, 91 conjunts are in the unsatisfiable core [2020-07-21 11:49:31,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:49:42,869 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:49:43,876 INFO L134 CoverageAnalysis]: Checked inductivity of 18001 backedges. 166 proven. 4223 refuted. 0 times theorem prover too weak. 13612 trivial. 0 not checked. [2020-07-21 11:49:43,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:49:44,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:49:46,156 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1543625399] [2020-07-21 11:49:46,156 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:49:46,157 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [89] total 89 [2020-07-21 11:49:46,157 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1832834875] [2020-07-21 11:49:46,158 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2020-07-21 11:49:46,158 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:49:46,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2020-07-21 11:49:46,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=434, Invalid=7938, Unknown=0, NotChecked=0, Total=8372 [2020-07-21 11:49:46,160 INFO L87 Difference]: Start difference. First operand 395 states and 436 transitions. Second operand 89 states. [2020-07-21 11:50:28,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:50:28,538 INFO L93 Difference]: Finished difference Result 407 states and 449 transitions. [2020-07-21 11:50:28,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2020-07-21 11:50:28,543 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 556 [2020-07-21 11:50:28,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:50:28,546 INFO L225 Difference]: With dead ends: 407 [2020-07-21 11:50:28,546 INFO L226 Difference]: Without dead ends: 405 [2020-07-21 11:50:28,549 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 612 GetRequests, 475 SyntacticMatches, 3 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6646 ImplicationChecksByTransitivity, 21.3s TimeCoverageRelationStatistics Valid=824, Invalid=17536, Unknown=0, NotChecked=0, Total=18360 [2020-07-21 11:50:28,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 405 states. [2020-07-21 11:50:28,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 405 to 404. [2020-07-21 11:50:28,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 404 states. [2020-07-21 11:50:28,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 404 states to 404 states and 446 transitions. [2020-07-21 11:50:28,595 INFO L78 Accepts]: Start accepts. Automaton has 404 states and 446 transitions. Word has length 556 [2020-07-21 11:50:28,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:50:28,596 INFO L479 AbstractCegarLoop]: Abstraction has 404 states and 446 transitions. [2020-07-21 11:50:28,596 INFO L480 AbstractCegarLoop]: Interpolant automaton has 89 states. [2020-07-21 11:50:28,596 INFO L276 IsEmpty]: Start isEmpty. Operand 404 states and 446 transitions. [2020-07-21 11:50:28,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 570 [2020-07-21 11:50:28,602 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:50:28,602 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] [2020-07-21 11:50:28,810 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:50:28,811 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:50:28,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:50:28,812 INFO L82 PathProgramCache]: Analyzing trace with hash -1148377659, now seen corresponding path program 42 times [2020-07-21 11:50:28,812 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:50:28,813 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1369644343] [2020-07-21 11:50:28,813 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 [2020-07-21 11:50:28,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:50:28,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 1066 conjuncts, 93 conjunts are in the unsatisfiable core [2020-07-21 11:50:28,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:50:41,705 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:50:42,780 INFO L134 CoverageAnalysis]: Checked inductivity of 18881 backedges. 170 proven. 4431 refuted. 0 times theorem prover too weak. 14280 trivial. 0 not checked. [2020-07-21 11:50:42,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:50:43,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:50:45,243 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1369644343] [2020-07-21 11:50:45,244 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:50:45,244 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [91] total 91 [2020-07-21 11:50:45,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961132653] [2020-07-21 11:50:45,245 INFO L459 AbstractCegarLoop]: Interpolant automaton has 91 states [2020-07-21 11:50:45,245 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:50:45,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2020-07-21 11:50:45,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=444, Invalid=8298, Unknown=0, NotChecked=0, Total=8742 [2020-07-21 11:50:45,246 INFO L87 Difference]: Start difference. First operand 404 states and 446 transitions. Second operand 91 states. [2020-07-21 11:51:23,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:51:23,790 INFO L93 Difference]: Finished difference Result 416 states and 459 transitions. [2020-07-21 11:51:23,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2020-07-21 11:51:23,794 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 569 [2020-07-21 11:51:23,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:51:23,797 INFO L225 Difference]: With dead ends: 416 [2020-07-21 11:51:23,797 INFO L226 Difference]: Without dead ends: 414 [2020-07-21 11:51:23,798 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 626 GetRequests, 486 SyntacticMatches, 3 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6955 ImplicationChecksByTransitivity, 22.3s TimeCoverageRelationStatistics Valid=843, Invalid=18339, Unknown=0, NotChecked=0, Total=19182 [2020-07-21 11:51:23,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 414 states. [2020-07-21 11:51:23,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 414 to 413. [2020-07-21 11:51:23,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 413 states. [2020-07-21 11:51:23,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 456 transitions. [2020-07-21 11:51:23,849 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 456 transitions. Word has length 569 [2020-07-21 11:51:23,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:51:23,850 INFO L479 AbstractCegarLoop]: Abstraction has 413 states and 456 transitions. [2020-07-21 11:51:23,850 INFO L480 AbstractCegarLoop]: Interpolant automaton has 91 states. [2020-07-21 11:51:23,850 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 456 transitions. [2020-07-21 11:51:23,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 583 [2020-07-21 11:51:23,853 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:51:23,854 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] [2020-07-21 11:51:24,054 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:51:24,054 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:51:24,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:51:24,055 INFO L82 PathProgramCache]: Analyzing trace with hash 2028231693, now seen corresponding path program 43 times [2020-07-21 11:51:24,055 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:51:24,056 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2053434658] [2020-07-21 11:51:24,056 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 [2020-07-21 11:51:24,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:51:24,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 1090 conjuncts, 95 conjunts are in the unsatisfiable core [2020-07-21 11:51:24,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:51:33,075 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:51:33,933 INFO L134 CoverageAnalysis]: Checked inductivity of 19782 backedges. 174 proven. 4644 refuted. 0 times theorem prover too weak. 14964 trivial. 0 not checked. [2020-07-21 11:51:33,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:51:34,333 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:51:35,542 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2053434658] [2020-07-21 11:51:35,542 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:51:35,542 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [93] total 93 [2020-07-21 11:51:35,543 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032674761] [2020-07-21 11:51:35,543 INFO L459 AbstractCegarLoop]: Interpolant automaton has 93 states [2020-07-21 11:51:35,544 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:51:35,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2020-07-21 11:51:35,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=454, Invalid=8666, Unknown=0, NotChecked=0, Total=9120 [2020-07-21 11:51:35,545 INFO L87 Difference]: Start difference. First operand 413 states and 456 transitions. Second operand 93 states. [2020-07-21 11:52:08,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:52:08,142 INFO L93 Difference]: Finished difference Result 425 states and 469 transitions. [2020-07-21 11:52:08,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 136 states. [2020-07-21 11:52:08,146 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 582 [2020-07-21 11:52:08,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:52:08,149 INFO L225 Difference]: With dead ends: 425 [2020-07-21 11:52:08,149 INFO L226 Difference]: Without dead ends: 423 [2020-07-21 11:52:08,150 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 640 GetRequests, 497 SyntacticMatches, 3 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7271 ImplicationChecksByTransitivity, 16.2s TimeCoverageRelationStatistics Valid=862, Invalid=19160, Unknown=0, NotChecked=0, Total=20022 [2020-07-21 11:52:08,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 423 states. [2020-07-21 11:52:08,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 423 to 422. [2020-07-21 11:52:08,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 422 states. [2020-07-21 11:52:08,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 422 states to 422 states and 466 transitions. [2020-07-21 11:52:08,178 INFO L78 Accepts]: Start accepts. Automaton has 422 states and 466 transitions. Word has length 582 [2020-07-21 11:52:08,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:52:08,179 INFO L479 AbstractCegarLoop]: Abstraction has 422 states and 466 transitions. [2020-07-21 11:52:08,179 INFO L480 AbstractCegarLoop]: Interpolant automaton has 93 states. [2020-07-21 11:52:08,179 INFO L276 IsEmpty]: Start isEmpty. Operand 422 states and 466 transitions. [2020-07-21 11:52:08,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 596 [2020-07-21 11:52:08,184 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:52:08,184 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] [2020-07-21 11:52:08,388 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:52:08,389 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:52:08,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:52:08,390 INFO L82 PathProgramCache]: Analyzing trace with hash -1344955707, now seen corresponding path program 44 times [2020-07-21 11:52:08,390 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:52:08,390 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1108965669] [2020-07-21 11:52:08,391 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 [2020-07-21 11:52:08,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:52:08,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 1114 conjuncts, 97 conjunts are in the unsatisfiable core [2020-07-21 11:52:08,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:52:18,688 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:52:19,615 INFO L134 CoverageAnalysis]: Checked inductivity of 20704 backedges. 178 proven. 4862 refuted. 0 times theorem prover too weak. 15664 trivial. 0 not checked. [2020-07-21 11:52:19,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:52:20,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:52:21,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1108965669] [2020-07-21 11:52:21,477 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:52:21,477 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [95] total 95 [2020-07-21 11:52:21,477 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529363924] [2020-07-21 11:52:21,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2020-07-21 11:52:21,478 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:52:21,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2020-07-21 11:52:21,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=464, Invalid=9042, Unknown=0, NotChecked=0, Total=9506 [2020-07-21 11:52:21,479 INFO L87 Difference]: Start difference. First operand 422 states and 466 transitions. Second operand 95 states. [2020-07-21 11:53:00,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:53:00,268 INFO L93 Difference]: Finished difference Result 434 states and 479 transitions. [2020-07-21 11:53:00,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2020-07-21 11:53:00,273 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 595 [2020-07-21 11:53:00,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:53:00,277 INFO L225 Difference]: With dead ends: 434 [2020-07-21 11:53:00,277 INFO L226 Difference]: Without dead ends: 432 [2020-07-21 11:53:00,278 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 654 GetRequests, 508 SyntacticMatches, 3 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7594 ImplicationChecksByTransitivity, 18.6s TimeCoverageRelationStatistics Valid=881, Invalid=19999, Unknown=0, NotChecked=0, Total=20880 [2020-07-21 11:53:00,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 432 states. [2020-07-21 11:53:00,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 432 to 431. [2020-07-21 11:53:00,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 431 states. [2020-07-21 11:53:00,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 431 states to 431 states and 476 transitions. [2020-07-21 11:53:00,320 INFO L78 Accepts]: Start accepts. Automaton has 431 states and 476 transitions. Word has length 595 [2020-07-21 11:53:00,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:53:00,321 INFO L479 AbstractCegarLoop]: Abstraction has 431 states and 476 transitions. [2020-07-21 11:53:00,321 INFO L480 AbstractCegarLoop]: Interpolant automaton has 95 states. [2020-07-21 11:53:00,321 INFO L276 IsEmpty]: Start isEmpty. Operand 431 states and 476 transitions. [2020-07-21 11:53:00,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 609 [2020-07-21 11:53:00,326 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:53:00,327 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] [2020-07-21 11:53:00,539 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:53:00,540 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:53:00,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:53:00,541 INFO L82 PathProgramCache]: Analyzing trace with hash 381814541, now seen corresponding path program 45 times [2020-07-21 11:53:00,541 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:53:00,541 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [512473211] [2020-07-21 11:53:00,542 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 [2020-07-21 11:53:00,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:53:00,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 1138 conjuncts, 99 conjunts are in the unsatisfiable core [2020-07-21 11:53:00,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:53:12,719 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:53:13,785 INFO L134 CoverageAnalysis]: Checked inductivity of 21647 backedges. 182 proven. 5085 refuted. 0 times theorem prover too weak. 16380 trivial. 0 not checked. [2020-07-21 11:53:13,786 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:53:14,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:53:16,028 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [512473211] [2020-07-21 11:53:16,028 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:53:16,029 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97] total 97 [2020-07-21 11:53:16,029 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024825604] [2020-07-21 11:53:16,030 INFO L459 AbstractCegarLoop]: Interpolant automaton has 97 states [2020-07-21 11:53:16,030 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:53:16,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2020-07-21 11:53:16,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=474, Invalid=9426, Unknown=0, NotChecked=0, Total=9900 [2020-07-21 11:53:16,031 INFO L87 Difference]: Start difference. First operand 431 states and 476 transitions. Second operand 97 states. [2020-07-21 11:54:04,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:54:04,142 INFO L93 Difference]: Finished difference Result 443 states and 489 transitions. [2020-07-21 11:54:04,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2020-07-21 11:54:04,147 INFO L78 Accepts]: Start accepts. Automaton has 97 states. Word has length 608 [2020-07-21 11:54:04,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:54:04,150 INFO L225 Difference]: With dead ends: 443 [2020-07-21 11:54:04,151 INFO L226 Difference]: Without dead ends: 441 [2020-07-21 11:54:04,152 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 668 GetRequests, 519 SyntacticMatches, 3 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7924 ImplicationChecksByTransitivity, 22.2s TimeCoverageRelationStatistics Valid=900, Invalid=20856, Unknown=0, NotChecked=0, Total=21756 [2020-07-21 11:54:04,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2020-07-21 11:54:04,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 440. [2020-07-21 11:54:04,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 440 states. [2020-07-21 11:54:04,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 440 states to 440 states and 486 transitions. [2020-07-21 11:54:04,197 INFO L78 Accepts]: Start accepts. Automaton has 440 states and 486 transitions. Word has length 608 [2020-07-21 11:54:04,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:54:04,199 INFO L479 AbstractCegarLoop]: Abstraction has 440 states and 486 transitions. [2020-07-21 11:54:04,199 INFO L480 AbstractCegarLoop]: Interpolant automaton has 97 states. [2020-07-21 11:54:04,199 INFO L276 IsEmpty]: Start isEmpty. Operand 440 states and 486 transitions. [2020-07-21 11:54:04,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 622 [2020-07-21 11:54:04,204 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:54:04,204 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] [2020-07-21 11:54:04,417 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:54:04,418 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:54:04,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:54:04,419 INFO L82 PathProgramCache]: Analyzing trace with hash 1724239813, now seen corresponding path program 46 times [2020-07-21 11:54:04,419 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:54:04,419 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [950752490] [2020-07-21 11:54:04,420 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 [2020-07-21 11:54:04,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:54:04,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 1162 conjuncts, 101 conjunts are in the unsatisfiable core [2020-07-21 11:54:04,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:54:18,289 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:54:19,435 INFO L134 CoverageAnalysis]: Checked inductivity of 22611 backedges. 186 proven. 5313 refuted. 0 times theorem prover too weak. 17112 trivial. 0 not checked. [2020-07-21 11:54:19,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:54:20,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:54:21,880 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [950752490] [2020-07-21 11:54:21,881 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 11:54:21,881 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [99] total 99 [2020-07-21 11:54:21,881 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382773527] [2020-07-21 11:54:21,882 INFO L459 AbstractCegarLoop]: Interpolant automaton has 99 states [2020-07-21 11:54:21,882 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:54:21,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2020-07-21 11:54:21,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=484, Invalid=9818, Unknown=0, NotChecked=0, Total=10302 [2020-07-21 11:54:21,884 INFO L87 Difference]: Start difference. First operand 440 states and 486 transitions. Second operand 99 states.