/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/ldv-regression/test23-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-22 03:52:44,413 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-22 03:52:44,417 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-22 03:52:44,477 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-12-22 03:52:44,576 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-22 03:52:44,631 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-22 03:52:44,631 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-22 03:52:44,636 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-22 03:52:44,636 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-22 03:52:44,637 INFO L138 SettingsManager]: * Use SBE=true [2020-12-22 03:52:44,637 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-22 03:52:44,637 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-22 03:52:44,637 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-22 03:52:44,638 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-22 03:52:44,638 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-22 03:52:44,639 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-22 03:52:44,640 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-22 03:52:44,640 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-22 03:52:44,640 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-22 03:52:44,640 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-22 03:52:44,640 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-22 03:52:44,641 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-22 03:52:44,641 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-22 03:52:44,641 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-22 03:52:44,641 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-22 03:52:44,642 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-22 03:52:44,642 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-22 03:52:44,642 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-22 03:52:44,642 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-22 03:52:44,642 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-22 03:52:44,643 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-22 03:52:45,035 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-22 03:52:45,077 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-22 03:52:45,080 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-22 03:52:45,081 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-22 03:52:45,082 INFO L275 PluginConnector]: CDTParser initialized [2020-12-22 03:52:45,083 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/ldv-regression/test23-1.c [2020-12-22 03:52:45,183 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/490d53327/1b4d1814038d4f398453a649e7380681/FLAG8b1231a6f [2020-12-22 03:52:45,904 INFO L306 CDTParser]: Found 1 translation units. [2020-12-22 03:52:45,904 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/ldv-regression/test23-1.c [2020-12-22 03:52:45,914 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/490d53327/1b4d1814038d4f398453a649e7380681/FLAG8b1231a6f [2020-12-22 03:52:46,242 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/490d53327/1b4d1814038d4f398453a649e7380681 [2020-12-22 03:52:46,245 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-22 03:52:46,248 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-22 03:52:46,249 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-22 03:52:46,250 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-22 03:52:46,254 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-22 03:52:46,255 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 03:52:46" (1/1) ... [2020-12-22 03:52:46,256 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@482c46a6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:52:46, skipping insertion in model container [2020-12-22 03:52:46,256 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 03:52:46" (1/1) ... [2020-12-22 03:52:46,265 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-22 03:52:46,282 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-22 03:52:46,463 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/ldv-regression/test23-1.c[1075,1088] [2020-12-22 03:52:46,467 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 03:52:46,482 INFO L203 MainTranslator]: Completed pre-run [2020-12-22 03:52:46,503 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/ldv-regression/test23-1.c[1075,1088] [2020-12-22 03:52:46,505 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 03:52:46,522 INFO L208 MainTranslator]: Completed translation [2020-12-22 03:52:46,523 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:52:46 WrapperNode [2020-12-22 03:52:46,523 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-22 03:52:46,525 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-22 03:52:46,525 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-22 03:52:46,525 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-22 03:52:46,533 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:52:46" (1/1) ... [2020-12-22 03:52:46,543 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:52:46" (1/1) ... [2020-12-22 03:52:46,572 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-22 03:52:46,573 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-22 03:52:46,573 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-22 03:52:46,574 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-22 03:52:46,583 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:52:46" (1/1) ... [2020-12-22 03:52:46,584 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:52:46" (1/1) ... [2020-12-22 03:52:46,586 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:52:46" (1/1) ... [2020-12-22 03:52:46,587 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:52:46" (1/1) ... [2020-12-22 03:52:46,594 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:52:46" (1/1) ... [2020-12-22 03:52:46,598 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:52:46" (1/1) ... [2020-12-22 03:52:46,600 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:52:46" (1/1) ... [2020-12-22 03:52:46,603 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-22 03:52:46,604 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-22 03:52:46,604 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-22 03:52:46,604 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-22 03:52:46,606 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:52:46" (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 [2020-12-22 03:52:46,698 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-22 03:52:46,698 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-22 03:52:46,699 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-22 03:52:46,699 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-22 03:52:46,699 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-22 03:52:46,699 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-22 03:52:47,150 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-22 03:52:47,150 INFO L299 CfgBuilder]: Removed 13 assume(true) statements. [2020-12-22 03:52:47,153 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 03:52:47 BoogieIcfgContainer [2020-12-22 03:52:47,153 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-22 03:52:47,157 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-22 03:52:47,157 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-22 03:52:47,162 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-22 03:52:47,163 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 03:52:46" (1/3) ... [2020-12-22 03:52:47,165 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d02f9aa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 03:52:47, skipping insertion in model container [2020-12-22 03:52:47,165 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 03:52:46" (2/3) ... [2020-12-22 03:52:47,167 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d02f9aa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 03:52:47, skipping insertion in model container [2020-12-22 03:52:47,167 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 03:52:47" (3/3) ... [2020-12-22 03:52:47,170 INFO L111 eAbstractionObserver]: Analyzing ICFG test23-1.c [2020-12-22 03:52:47,177 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-22 03:52:47,184 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-22 03:52:47,206 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-22 03:52:47,255 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-22 03:52:47,256 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-22 03:52:47,258 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-22 03:52:47,258 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-22 03:52:47,258 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-22 03:52:47,259 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-22 03:52:47,259 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-22 03:52:47,259 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-22 03:52:47,280 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-12-22 03:52:47,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-22 03:52:47,294 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 03:52:47,296 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 03:52:47,297 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 03:52:47,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 03:52:47,305 INFO L82 PathProgramCache]: Analyzing trace with hash 2100293056, now seen corresponding path program 1 times [2020-12-22 03:52:47,315 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 03:52:47,316 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [362615852] [2020-12-22 03:52:47,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 03:52:47,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 03:52:47,647 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:52:47,648 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [362615852] [2020-12-22 03:52:47,650 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 03:52:47,650 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-22 03:52:47,651 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586955134] [2020-12-22 03:52:47,657 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-12-22 03:52:47,657 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 03:52:47,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-12-22 03:52:47,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-22 03:52:47,680 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-12-22 03:52:47,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 03:52:47,715 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-12-22 03:52:47,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-12-22 03:52:47,716 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2020-12-22 03:52:47,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 03:52:47,725 INFO L225 Difference]: With dead ends: 30 [2020-12-22 03:52:47,725 INFO L226 Difference]: Without dead ends: 17 [2020-12-22 03:52:47,730 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-22 03:52:47,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-12-22 03:52:47,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-12-22 03:52:47,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-22 03:52:47,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-12-22 03:52:47,766 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 15 [2020-12-22 03:52:47,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 03:52:47,767 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-12-22 03:52:47,767 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-12-22 03:52:47,767 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-12-22 03:52:47,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-22 03:52:47,769 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 03:52:47,769 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 03:52:47,770 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-22 03:52:47,771 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 03:52:47,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 03:52:47,774 INFO L82 PathProgramCache]: Analyzing trace with hash 478567452, now seen corresponding path program 1 times [2020-12-22 03:52:47,775 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 03:52:47,777 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1894605732] [2020-12-22 03:52:47,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 03:52:47,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 03:52:48,113 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:52:48,114 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1894605732] [2020-12-22 03:52:48,114 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 03:52:48,114 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2020-12-22 03:52:48,114 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405426113] [2020-12-22 03:52:48,116 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-22 03:52:48,116 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 03:52:48,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-22 03:52:48,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2020-12-22 03:52:48,118 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 11 states. [2020-12-22 03:52:48,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 03:52:48,539 INFO L93 Difference]: Finished difference Result 59 states and 63 transitions. [2020-12-22 03:52:48,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-22 03:52:48,540 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2020-12-22 03:52:48,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 03:52:48,542 INFO L225 Difference]: With dead ends: 59 [2020-12-22 03:52:48,542 INFO L226 Difference]: Without dead ends: 54 [2020-12-22 03:52:48,544 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=251, Unknown=0, NotChecked=0, Total=342 [2020-12-22 03:52:48,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-12-22 03:52:48,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 25. [2020-12-22 03:52:48,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-12-22 03:52:48,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2020-12-22 03:52:48,554 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 16 [2020-12-22 03:52:48,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 03:52:48,555 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2020-12-22 03:52:48,555 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-22 03:52:48,555 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2020-12-22 03:52:48,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-22 03:52:48,556 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 03:52:48,556 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 03:52:48,556 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-22 03:52:48,557 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 03:52:48,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 03:52:48,557 INFO L82 PathProgramCache]: Analyzing trace with hash -108238562, now seen corresponding path program 1 times [2020-12-22 03:52:48,558 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 03:52:48,558 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1245159290] [2020-12-22 03:52:48,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 03:52:48,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 03:52:48,647 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:52:48,647 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1245159290] [2020-12-22 03:52:48,648 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 03:52:48,648 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-12-22 03:52:48,648 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1034578066] [2020-12-22 03:52:48,649 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-22 03:52:48,649 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 03:52:48,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-22 03:52:48,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-12-22 03:52:48,650 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand 9 states. [2020-12-22 03:52:48,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 03:52:48,821 INFO L93 Difference]: Finished difference Result 54 states and 57 transitions. [2020-12-22 03:52:48,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-22 03:52:48,821 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-12-22 03:52:48,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 03:52:48,823 INFO L225 Difference]: With dead ends: 54 [2020-12-22 03:52:48,823 INFO L226 Difference]: Without dead ends: 44 [2020-12-22 03:52:48,824 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-12-22 03:52:48,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-12-22 03:52:48,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 25. [2020-12-22 03:52:48,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-12-22 03:52:48,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-12-22 03:52:48,831 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 16 [2020-12-22 03:52:48,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 03:52:48,832 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-12-22 03:52:48,832 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-22 03:52:48,832 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-12-22 03:52:48,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-22 03:52:48,833 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 03:52:48,833 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 03:52:48,833 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-12-22 03:52:48,834 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 03:52:48,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 03:52:48,834 INFO L82 PathProgramCache]: Analyzing trace with hash -501265572, now seen corresponding path program 1 times [2020-12-22 03:52:48,835 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 03:52:48,835 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [186468407] [2020-12-22 03:52:48,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 03:52:48,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 03:52:49,045 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:52:49,046 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [186468407] [2020-12-22 03:52:49,046 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 03:52:49,046 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2020-12-22 03:52:49,047 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688539741] [2020-12-22 03:52:49,048 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-22 03:52:49,048 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 03:52:49,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-22 03:52:49,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2020-12-22 03:52:49,050 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 11 states. [2020-12-22 03:52:49,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 03:52:49,368 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-12-22 03:52:49,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-22 03:52:49,369 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2020-12-22 03:52:49,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 03:52:49,370 INFO L225 Difference]: With dead ends: 51 [2020-12-22 03:52:49,370 INFO L226 Difference]: Without dead ends: 46 [2020-12-22 03:52:49,371 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2020-12-22 03:52:49,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-12-22 03:52:49,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 22. [2020-12-22 03:52:49,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-12-22 03:52:49,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-12-22 03:52:49,378 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 16 [2020-12-22 03:52:49,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 03:52:49,378 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-12-22 03:52:49,378 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-22 03:52:49,378 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-12-22 03:52:49,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-12-22 03:52:49,379 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 03:52:49,379 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 03:52:49,380 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-12-22 03:52:49,380 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 03:52:49,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 03:52:49,381 INFO L82 PathProgramCache]: Analyzing trace with hash 1851619425, now seen corresponding path program 1 times [2020-12-22 03:52:49,381 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 03:52:49,381 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [736056392] [2020-12-22 03:52:49,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 03:52:49,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 03:52:49,557 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:52:49,557 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [736056392] [2020-12-22 03:52:49,558 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1605977216] [2020-12-22 03:52:49,558 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 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 03:52:49,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 03:52:49,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 35 conjunts are in the unsatisfiable core [2020-12-22 03:52:49,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 03:52:49,752 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2020-12-22 03:52:49,753 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-22 03:52:49,765 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-22 03:52:49,767 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-22 03:52:49,768 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:54, output treesize:50 [2020-12-22 03:52:49,932 INFO L348 Elim1Store]: treesize reduction 43, result has 39.4 percent of original size [2020-12-22 03:52:49,933 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 39 [2020-12-22 03:52:49,946 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-22 03:52:49,956 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-12-22 03:52:49,976 INFO L625 ElimStorePlain]: treesize reduction 14, result has 60.0 percent of original size [2020-12-22 03:52:49,980 INFO L547 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-22 03:52:49,980 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:59, output treesize:5 [2020-12-22 03:52:50,001 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:52:50,002 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 03:52:50,002 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 15 [2020-12-22 03:52:50,002 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070635357] [2020-12-22 03:52:50,003 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-22 03:52:50,003 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 03:52:50,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-22 03:52:50,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=202, Unknown=0, NotChecked=0, Total=240 [2020-12-22 03:52:50,004 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 16 states. [2020-12-22 03:52:50,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 03:52:50,816 INFO L93 Difference]: Finished difference Result 55 states and 58 transitions. [2020-12-22 03:52:50,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-22 03:52:50,817 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 18 [2020-12-22 03:52:50,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 03:52:50,818 INFO L225 Difference]: With dead ends: 55 [2020-12-22 03:52:50,818 INFO L226 Difference]: Without dead ends: 50 [2020-12-22 03:52:50,819 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=181, Invalid=575, Unknown=0, NotChecked=0, Total=756 [2020-12-22 03:52:50,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-12-22 03:52:50,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 27. [2020-12-22 03:52:50,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-12-22 03:52:50,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2020-12-22 03:52:50,826 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 18 [2020-12-22 03:52:50,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 03:52:50,827 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2020-12-22 03:52:50,827 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-22 03:52:50,827 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2020-12-22 03:52:50,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-12-22 03:52:50,828 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 03:52:50,828 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 03:52:51,037 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 03:52:51,037 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 03:52:51,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 03:52:51,038 INFO L82 PathProgramCache]: Analyzing trace with hash 829921185, now seen corresponding path program 1 times [2020-12-22 03:52:51,039 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 03:52:51,039 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [151144434] [2020-12-22 03:52:51,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 03:52:51,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 03:52:51,321 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:52:51,322 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [151144434] [2020-12-22 03:52:51,322 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [107709522] [2020-12-22 03:52:51,322 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 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 03:52:51,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 03:52:51,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 35 conjunts are in the unsatisfiable core [2020-12-22 03:52:51,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 03:52:51,461 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2020-12-22 03:52:51,462 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-22 03:52:51,475 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-22 03:52:51,477 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-22 03:52:51,477 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:54, output treesize:50 [2020-12-22 03:52:51,634 INFO L348 Elim1Store]: treesize reduction 48, result has 32.4 percent of original size [2020-12-22 03:52:51,635 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 34 [2020-12-22 03:52:51,639 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-22 03:52:51,649 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-12-22 03:52:51,667 INFO L625 ElimStorePlain]: treesize reduction 14, result has 60.0 percent of original size [2020-12-22 03:52:51,671 INFO L547 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-22 03:52:51,671 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:59, output treesize:5 [2020-12-22 03:52:51,693 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:52:51,693 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 03:52:51,693 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 15 [2020-12-22 03:52:51,694 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541459138] [2020-12-22 03:52:51,694 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-22 03:52:51,694 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 03:52:51,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-22 03:52:51,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=202, Unknown=0, NotChecked=0, Total=240 [2020-12-22 03:52:51,696 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 16 states. [2020-12-22 03:52:52,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 03:52:52,277 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2020-12-22 03:52:52,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-22 03:52:52,277 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 18 [2020-12-22 03:52:52,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 03:52:52,278 INFO L225 Difference]: With dead ends: 57 [2020-12-22 03:52:52,278 INFO L226 Difference]: Without dead ends: 52 [2020-12-22 03:52:52,279 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=116, Invalid=390, Unknown=0, NotChecked=0, Total=506 [2020-12-22 03:52:52,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-12-22 03:52:52,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 24. [2020-12-22 03:52:52,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-22 03:52:52,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-12-22 03:52:52,286 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 18 [2020-12-22 03:52:52,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 03:52:52,286 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-12-22 03:52:52,287 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-22 03:52:52,287 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-12-22 03:52:52,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-12-22 03:52:52,287 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 03:52:52,288 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 03:52:52,499 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 03:52:52,499 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 03:52:52,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 03:52:52,500 INFO L82 PathProgramCache]: Analyzing trace with hash -1495361690, now seen corresponding path program 2 times [2020-12-22 03:52:52,501 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 03:52:52,501 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1089490131] [2020-12-22 03:52:52,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 03:52:52,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 03:52:52,680 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:52:52,681 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1089490131] [2020-12-22 03:52:52,681 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1649926184] [2020-12-22 03:52:52,681 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 03:52:52,753 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-22 03:52:52,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 03:52:52,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 44 conjunts are in the unsatisfiable core [2020-12-22 03:52:52,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 03:52:52,797 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2020-12-22 03:52:52,798 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-22 03:52:52,808 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-22 03:52:52,809 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-22 03:52:52,809 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:59, output treesize:55 [2020-12-22 03:52:52,971 INFO L348 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-12-22 03:52:52,972 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 49 treesize of output 86 [2020-12-22 03:52:52,978 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-22 03:52:52,979 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-22 03:52:52,982 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-22 03:52:52,983 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-12-22 03:52:52,985 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-22 03:52:52,987 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-22 03:52:52,991 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 3 xjuncts. [2020-12-22 03:52:53,018 INFO L625 ElimStorePlain]: treesize reduction 47, result has 33.8 percent of original size [2020-12-22 03:52:53,022 INFO L547 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-22 03:52:53,022 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:64, output treesize:9 [2020-12-22 03:52:53,046 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:52:53,046 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 03:52:53,046 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 17 [2020-12-22 03:52:53,047 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1902652364] [2020-12-22 03:52:53,047 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-22 03:52:53,047 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 03:52:53,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-22 03:52:53,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2020-12-22 03:52:53,049 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 18 states. [2020-12-22 03:52:54,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 03:52:54,164 INFO L93 Difference]: Finished difference Result 63 states and 67 transitions. [2020-12-22 03:52:54,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-12-22 03:52:54,164 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 20 [2020-12-22 03:52:54,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 03:52:54,165 INFO L225 Difference]: With dead ends: 63 [2020-12-22 03:52:54,165 INFO L226 Difference]: Without dead ends: 58 [2020-12-22 03:52:54,167 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 332 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=359, Invalid=1201, Unknown=0, NotChecked=0, Total=1560 [2020-12-22 03:52:54,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-12-22 03:52:54,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 26. [2020-12-22 03:52:54,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-12-22 03:52:54,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-12-22 03:52:54,174 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 20 [2020-12-22 03:52:54,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 03:52:54,174 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-12-22 03:52:54,174 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-22 03:52:54,175 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-12-22 03:52:54,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-12-22 03:52:54,175 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 03:52:54,175 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 03:52:54,390 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 03:52:54,391 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 03:52:54,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 03:52:54,392 INFO L82 PathProgramCache]: Analyzing trace with hash -1013708501, now seen corresponding path program 3 times [2020-12-22 03:52:54,393 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 03:52:54,393 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1862488413] [2020-12-22 03:52:54,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 03:52:54,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 03:52:54,593 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:52:54,594 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1862488413] [2020-12-22 03:52:54,594 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1613271483] [2020-12-22 03:52:54,594 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 03:52:54,682 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-12-22 03:52:54,682 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 03:52:54,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 37 conjunts are in the unsatisfiable core [2020-12-22 03:52:54,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 03:52:54,738 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2020-12-22 03:52:54,740 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-22 03:52:54,748 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-22 03:52:54,750 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-22 03:52:54,752 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:54, output treesize:50 [2020-12-22 03:52:54,959 INFO L348 Elim1Store]: treesize reduction 48, result has 32.4 percent of original size [2020-12-22 03:52:54,959 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 34 [2020-12-22 03:52:54,963 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-22 03:52:54,965 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-12-22 03:52:54,985 INFO L625 ElimStorePlain]: treesize reduction 14, result has 60.0 percent of original size [2020-12-22 03:52:54,988 INFO L547 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-22 03:52:54,989 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:59, output treesize:5 [2020-12-22 03:52:54,995 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:52:54,995 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 03:52:54,995 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 18 [2020-12-22 03:52:54,996 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472242122] [2020-12-22 03:52:54,996 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-22 03:52:54,996 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 03:52:54,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-22 03:52:54,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=279, Unknown=0, NotChecked=0, Total=342 [2020-12-22 03:52:54,998 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 19 states. [2020-12-22 03:52:56,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 03:52:56,418 INFO L93 Difference]: Finished difference Result 69 states and 73 transitions. [2020-12-22 03:52:56,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-12-22 03:52:56,422 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 22 [2020-12-22 03:52:56,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 03:52:56,423 INFO L225 Difference]: With dead ends: 69 [2020-12-22 03:52:56,423 INFO L226 Difference]: Without dead ends: 64 [2020-12-22 03:52:56,425 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 511 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=512, Invalid=1650, Unknown=0, NotChecked=0, Total=2162 [2020-12-22 03:52:56,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-12-22 03:52:56,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 28. [2020-12-22 03:52:56,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-12-22 03:52:56,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-12-22 03:52:56,433 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 22 [2020-12-22 03:52:56,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 03:52:56,433 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-12-22 03:52:56,433 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-22 03:52:56,434 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-12-22 03:52:56,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-22 03:52:56,434 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 03:52:56,434 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 03:52:56,648 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 03:52:56,649 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 03:52:56,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 03:52:56,650 INFO L82 PathProgramCache]: Analyzing trace with hash -2001461840, now seen corresponding path program 4 times [2020-12-22 03:52:56,650 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 03:52:56,651 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2083677182] [2020-12-22 03:52:56,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 03:52:56,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 03:52:56,911 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:52:56,911 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2083677182] [2020-12-22 03:52:56,911 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1161058426] [2020-12-22 03:52:56,912 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 03:52:56,957 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-22 03:52:56,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 03:52:56,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 20 conjunts are in the unsatisfiable core [2020-12-22 03:52:56,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 03:52:57,002 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 50 [2020-12-22 03:52:57,003 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-22 03:52:57,009 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-22 03:52:57,012 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2020-12-22 03:52:57,013 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:92, output treesize:76 [2020-12-22 03:53:37,224 INFO L348 Elim1Store]: treesize reduction 33, result has 8.3 percent of original size [2020-12-22 03:53:37,225 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 83 treesize of output 18 [2020-12-22 03:53:37,226 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-22 03:53:37,232 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-22 03:53:37,234 INFO L547 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-22 03:53:37,235 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:83, output treesize:5 [2020-12-22 03:53:37,273 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:53:37,274 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 03:53:37,274 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 8] total 22 [2020-12-22 03:53:37,274 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067463833] [2020-12-22 03:53:37,274 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-12-22 03:53:37,275 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 03:53:37,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-12-22 03:53:37,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=371, Unknown=18, NotChecked=0, Total=462 [2020-12-22 03:53:37,276 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 22 states. [2020-12-22 03:53:53,601 WARN L197 SmtUtils]: Spent 2.08 s on a formula simplification. DAG size of input: 50 DAG size of output: 48 [2020-12-22 03:53:56,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 03:53:56,589 INFO L93 Difference]: Finished difference Result 75 states and 79 transitions. [2020-12-22 03:53:56,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-12-22 03:53:56,590 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 24 [2020-12-22 03:53:56,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 03:53:56,594 INFO L225 Difference]: With dead ends: 75 [2020-12-22 03:53:56,594 INFO L226 Difference]: Without dead ends: 70 [2020-12-22 03:53:56,596 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 667 ImplicationChecksByTransitivity, 45.6s TimeCoverageRelationStatistics Valid=706, Invalid=2356, Unknown=18, NotChecked=0, Total=3080 [2020-12-22 03:53:56,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-12-22 03:53:56,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 30. [2020-12-22 03:53:56,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-12-22 03:53:56,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-12-22 03:53:56,617 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 24 [2020-12-22 03:53:56,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 03:53:56,618 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-12-22 03:53:56,618 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-12-22 03:53:56,618 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-12-22 03:53:56,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-12-22 03:53:56,619 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 03:53:56,620 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 03:53:56,833 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 03:53:56,834 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 03:53:56,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 03:53:56,835 INFO L82 PathProgramCache]: Analyzing trace with hash -2044648203, now seen corresponding path program 5 times [2020-12-22 03:53:56,835 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 03:53:56,836 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1396420951] [2020-12-22 03:53:56,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 03:53:56,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 03:53:57,186 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:53:57,186 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1396420951] [2020-12-22 03:53:57,187 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1619902161] [2020-12-22 03:53:57,187 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 03:53:57,251 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-12-22 03:53:57,252 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 03:53:57,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 39 conjunts are in the unsatisfiable core [2020-12-22 03:53:57,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 03:53:57,307 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2020-12-22 03:53:57,308 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-22 03:53:57,321 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-22 03:53:57,322 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-22 03:53:57,325 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:54, output treesize:50 [2020-12-22 03:53:57,703 INFO L348 Elim1Store]: treesize reduction 48, result has 32.4 percent of original size [2020-12-22 03:53:57,704 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 34 [2020-12-22 03:53:57,707 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-22 03:53:57,709 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-12-22 03:53:57,736 INFO L625 ElimStorePlain]: treesize reduction 14, result has 60.0 percent of original size [2020-12-22 03:53:57,740 INFO L547 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-22 03:53:57,740 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:59, output treesize:5 [2020-12-22 03:53:57,748 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:53:57,749 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 03:53:57,749 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 22 [2020-12-22 03:53:57,749 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2039016169] [2020-12-22 03:53:57,750 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-12-22 03:53:57,750 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 03:53:57,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-12-22 03:53:57,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=404, Unknown=0, NotChecked=0, Total=506 [2020-12-22 03:53:57,751 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 23 states. [2020-12-22 03:54:00,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 03:54:00,563 INFO L93 Difference]: Finished difference Result 81 states and 85 transitions. [2020-12-22 03:54:00,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-12-22 03:54:00,564 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 26 [2020-12-22 03:54:00,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 03:54:00,565 INFO L225 Difference]: With dead ends: 81 [2020-12-22 03:54:00,565 INFO L226 Difference]: Without dead ends: 76 [2020-12-22 03:54:00,568 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1073 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=929, Invalid=2977, Unknown=0, NotChecked=0, Total=3906 [2020-12-22 03:54:00,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-12-22 03:54:00,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 32. [2020-12-22 03:54:00,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-12-22 03:54:00,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-12-22 03:54:00,578 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 26 [2020-12-22 03:54:00,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 03:54:00,578 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-12-22 03:54:00,578 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-12-22 03:54:00,579 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-12-22 03:54:00,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-12-22 03:54:00,579 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 03:54:00,580 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 03:54:00,793 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 03:54:00,794 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 03:54:00,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 03:54:00,795 INFO L82 PathProgramCache]: Analyzing trace with hash -597070086, now seen corresponding path program 6 times [2020-12-22 03:54:00,795 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 03:54:00,796 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1811122204] [2020-12-22 03:54:00,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 03:54:00,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 03:54:01,220 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:54:01,220 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1811122204] [2020-12-22 03:54:01,221 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1981665345] [2020-12-22 03:54:01,221 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 03:54:01,356 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-22 03:54:01,356 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 03:54:01,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 44 conjunts are in the unsatisfiable core [2020-12-22 03:54:01,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 03:54:01,400 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2020-12-22 03:54:01,401 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-22 03:54:01,413 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-22 03:54:01,414 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-22 03:54:01,415 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:49, output treesize:45 [2020-12-22 03:54:01,923 INFO L348 Elim1Store]: treesize reduction 17, result has 15.0 percent of original size [2020-12-22 03:54:01,923 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 48 treesize of output 17 [2020-12-22 03:54:01,925 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-22 03:54:01,947 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-22 03:54:01,948 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-22 03:54:01,948 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:48, output treesize:5 [2020-12-22 03:54:01,992 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:54:01,993 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 03:54:01,993 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 25 [2020-12-22 03:54:01,993 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1416005525] [2020-12-22 03:54:01,995 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-12-22 03:54:01,995 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 03:54:01,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-12-22 03:54:01,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=547, Unknown=0, NotChecked=0, Total=650 [2020-12-22 03:54:01,997 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 26 states. [2020-12-22 03:54:05,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 03:54:05,458 INFO L93 Difference]: Finished difference Result 85 states and 88 transitions. [2020-12-22 03:54:05,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-12-22 03:54:05,462 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 28 [2020-12-22 03:54:05,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 03:54:05,463 INFO L225 Difference]: With dead ends: 85 [2020-12-22 03:54:05,463 INFO L226 Difference]: Without dead ends: 80 [2020-12-22 03:54:05,465 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 664 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=831, Invalid=2475, Unknown=0, NotChecked=0, Total=3306 [2020-12-22 03:54:05,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-12-22 03:54:05,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 37. [2020-12-22 03:54:05,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-12-22 03:54:05,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2020-12-22 03:54:05,477 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 28 [2020-12-22 03:54:05,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 03:54:05,477 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2020-12-22 03:54:05,477 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-12-22 03:54:05,477 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2020-12-22 03:54:05,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-12-22 03:54:05,478 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 03:54:05,478 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 03:54:05,691 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 03:54:05,692 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 03:54:05,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 03:54:05,693 INFO L82 PathProgramCache]: Analyzing trace with hash -237666758, now seen corresponding path program 2 times [2020-12-22 03:54:05,693 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 03:54:05,693 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [759702517] [2020-12-22 03:54:05,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 03:54:05,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 03:54:06,102 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:54:06,103 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [759702517] [2020-12-22 03:54:06,103 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [126985552] [2020-12-22 03:54:06,103 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 03:54:06,170 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-22 03:54:06,170 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 03:54:06,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 40 conjunts are in the unsatisfiable core [2020-12-22 03:54:06,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 03:54:06,206 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2020-12-22 03:54:06,207 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-22 03:54:06,216 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-22 03:54:06,217 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-22 03:54:06,217 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:46, output treesize:42 [2020-12-22 03:54:06,650 INFO L348 Elim1Store]: treesize reduction 17, result has 15.0 percent of original size [2020-12-22 03:54:06,650 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 48 treesize of output 17 [2020-12-22 03:54:06,653 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-22 03:54:06,664 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-22 03:54:06,665 INFO L547 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-22 03:54:06,666 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:48, output treesize:5 [2020-12-22 03:54:06,720 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:54:06,721 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 03:54:06,721 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 25 [2020-12-22 03:54:06,722 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598795306] [2020-12-22 03:54:06,722 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-12-22 03:54:06,723 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 03:54:06,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-12-22 03:54:06,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=547, Unknown=0, NotChecked=0, Total=650 [2020-12-22 03:54:06,724 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand 26 states. [2020-12-22 03:54:08,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 03:54:08,762 INFO L93 Difference]: Finished difference Result 87 states and 89 transitions. [2020-12-22 03:54:08,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-12-22 03:54:08,764 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 28 [2020-12-22 03:54:08,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 03:54:08,765 INFO L225 Difference]: With dead ends: 87 [2020-12-22 03:54:08,765 INFO L226 Difference]: Without dead ends: 82 [2020-12-22 03:54:08,766 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 248 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=446, Invalid=1360, Unknown=0, NotChecked=0, Total=1806 [2020-12-22 03:54:08,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-12-22 03:54:08,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 34. [2020-12-22 03:54:08,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-12-22 03:54:08,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-12-22 03:54:08,776 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 28 [2020-12-22 03:54:08,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 03:54:08,777 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-12-22 03:54:08,777 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-12-22 03:54:08,777 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-12-22 03:54:08,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-12-22 03:54:08,778 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 03:54:08,778 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 03:54:08,980 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-22 03:54:08,981 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 03:54:08,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 03:54:08,982 INFO L82 PathProgramCache]: Analyzing trace with hash -1043903553, now seen corresponding path program 7 times [2020-12-22 03:54:08,982 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 03:54:08,982 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2050063550] [2020-12-22 03:54:08,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 03:54:09,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 03:54:09,397 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:54:09,397 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2050063550] [2020-12-22 03:54:09,397 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [835764003] [2020-12-22 03:54:09,397 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 03:54:09,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 03:54:09,460 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 41 conjunts are in the unsatisfiable core [2020-12-22 03:54:09,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 03:54:09,497 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2020-12-22 03:54:09,498 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-22 03:54:09,508 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-22 03:54:09,509 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-22 03:54:09,509 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:54, output treesize:50 [2020-12-22 03:54:10,061 INFO L348 Elim1Store]: treesize reduction 48, result has 32.4 percent of original size [2020-12-22 03:54:10,062 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 34 [2020-12-22 03:54:10,065 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-22 03:54:10,067 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-12-22 03:54:10,094 INFO L625 ElimStorePlain]: treesize reduction 14, result has 60.0 percent of original size [2020-12-22 03:54:10,098 INFO L547 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-22 03:54:10,098 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:59, output treesize:5 [2020-12-22 03:54:10,143 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:54:10,143 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 03:54:10,143 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 27 [2020-12-22 03:54:10,144 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213002101] [2020-12-22 03:54:10,144 INFO L461 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-12-22 03:54:10,144 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 03:54:10,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-12-22 03:54:10,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=634, Unknown=0, NotChecked=0, Total=756 [2020-12-22 03:54:10,145 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 28 states. [2020-12-22 03:54:14,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 03:54:14,175 INFO L93 Difference]: Finished difference Result 91 states and 94 transitions. [2020-12-22 03:54:14,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-12-22 03:54:14,176 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 30 [2020-12-22 03:54:14,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 03:54:14,176 INFO L225 Difference]: With dead ends: 91 [2020-12-22 03:54:14,177 INFO L226 Difference]: Without dead ends: 86 [2020-12-22 03:54:14,178 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 840 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=1018, Invalid=3014, Unknown=0, NotChecked=0, Total=4032 [2020-12-22 03:54:14,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-12-22 03:54:14,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 39. [2020-12-22 03:54:14,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-12-22 03:54:14,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2020-12-22 03:54:14,190 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 30 [2020-12-22 03:54:14,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 03:54:14,190 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2020-12-22 03:54:14,190 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-12-22 03:54:14,190 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2020-12-22 03:54:14,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-12-22 03:54:14,191 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 03:54:14,191 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 03:54:14,394 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 03:54:14,395 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 03:54:14,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 03:54:14,396 INFO L82 PathProgramCache]: Analyzing trace with hash 745310975, now seen corresponding path program 3 times [2020-12-22 03:54:14,396 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 03:54:14,396 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773857980] [2020-12-22 03:54:14,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 03:54:14,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 03:54:14,799 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:54:14,800 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773857980] [2020-12-22 03:54:14,800 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1567222581] [2020-12-22 03:54:14,800 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 03:54:14,902 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2020-12-22 03:54:14,903 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 03:54:14,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 41 conjunts are in the unsatisfiable core [2020-12-22 03:54:14,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 03:54:14,949 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2020-12-22 03:54:14,950 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-22 03:54:14,959 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-22 03:54:14,960 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-22 03:54:14,961 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:46, output treesize:42 [2020-12-22 03:54:15,505 INFO L348 Elim1Store]: treesize reduction 17, result has 15.0 percent of original size [2020-12-22 03:54:15,505 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 48 treesize of output 17 [2020-12-22 03:54:15,508 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-22 03:54:15,514 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-22 03:54:15,516 INFO L547 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-22 03:54:15,516 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:48, output treesize:5 [2020-12-22 03:54:15,559 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:54:15,559 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 03:54:15,560 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 27 [2020-12-22 03:54:15,560 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358185581] [2020-12-22 03:54:15,560 INFO L461 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-12-22 03:54:15,560 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 03:54:15,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-12-22 03:54:15,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=634, Unknown=0, NotChecked=0, Total=756 [2020-12-22 03:54:15,562 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand 28 states. [2020-12-22 03:54:18,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 03:54:18,022 INFO L93 Difference]: Finished difference Result 93 states and 95 transitions. [2020-12-22 03:54:18,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-12-22 03:54:18,023 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 30 [2020-12-22 03:54:18,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 03:54:18,024 INFO L225 Difference]: With dead ends: 93 [2020-12-22 03:54:18,024 INFO L226 Difference]: Without dead ends: 88 [2020-12-22 03:54:18,025 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 309 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=539, Invalid=1623, Unknown=0, NotChecked=0, Total=2162 [2020-12-22 03:54:18,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-12-22 03:54:18,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 36. [2020-12-22 03:54:18,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-12-22 03:54:18,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-12-22 03:54:18,040 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 30 [2020-12-22 03:54:18,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 03:54:18,040 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-12-22 03:54:18,040 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-12-22 03:54:18,040 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-12-22 03:54:18,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-12-22 03:54:18,041 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 03:54:18,041 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 03:54:18,246 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 03:54:18,247 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 03:54:18,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 03:54:18,248 INFO L82 PathProgramCache]: Analyzing trace with hash -954135740, now seen corresponding path program 8 times [2020-12-22 03:54:18,248 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 03:54:18,248 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [353770156] [2020-12-22 03:54:18,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 03:54:18,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 03:54:18,711 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:54:18,711 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [353770156] [2020-12-22 03:54:18,712 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1323300055] [2020-12-22 03:54:18,712 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 03:54:18,778 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-22 03:54:18,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 03:54:18,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 42 conjunts are in the unsatisfiable core [2020-12-22 03:54:18,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 03:54:18,818 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2020-12-22 03:54:18,820 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-22 03:54:18,831 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-22 03:54:18,832 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-22 03:54:18,832 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:54, output treesize:50 [2020-12-22 03:54:19,535 INFO L348 Elim1Store]: treesize reduction 48, result has 32.4 percent of original size [2020-12-22 03:54:19,535 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 34 [2020-12-22 03:54:19,538 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-22 03:54:19,541 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-12-22 03:54:19,571 INFO L625 ElimStorePlain]: treesize reduction 14, result has 60.0 percent of original size [2020-12-22 03:54:19,574 INFO L547 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-22 03:54:19,574 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:59, output treesize:5 [2020-12-22 03:54:19,624 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:54:19,624 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 03:54:19,624 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 29 [2020-12-22 03:54:19,624 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655841174] [2020-12-22 03:54:19,625 INFO L461 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-12-22 03:54:19,625 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 03:54:19,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-12-22 03:54:19,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=727, Unknown=0, NotChecked=0, Total=870 [2020-12-22 03:54:19,626 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 30 states. [2020-12-22 03:54:24,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 03:54:24,717 INFO L93 Difference]: Finished difference Result 97 states and 100 transitions. [2020-12-22 03:54:24,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-12-22 03:54:24,718 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 32 [2020-12-22 03:54:24,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 03:54:24,719 INFO L225 Difference]: With dead ends: 97 [2020-12-22 03:54:24,719 INFO L226 Difference]: Without dead ends: 92 [2020-12-22 03:54:24,721 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1037 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=1224, Invalid=3606, Unknown=0, NotChecked=0, Total=4830 [2020-12-22 03:54:24,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-12-22 03:54:24,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 41. [2020-12-22 03:54:24,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-12-22 03:54:24,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2020-12-22 03:54:24,735 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 32 [2020-12-22 03:54:24,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 03:54:24,735 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2020-12-22 03:54:24,736 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-12-22 03:54:24,736 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2020-12-22 03:54:24,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-12-22 03:54:24,736 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 03:54:24,737 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 03:54:24,937 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2020-12-22 03:54:24,937 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 03:54:24,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 03:54:24,938 INFO L82 PathProgramCache]: Analyzing trace with hash 494107268, now seen corresponding path program 4 times [2020-12-22 03:54:24,939 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 03:54:24,939 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [133241154] [2020-12-22 03:54:24,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 03:54:24,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 03:54:25,433 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:54:25,433 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [133241154] [2020-12-22 03:54:25,433 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [543687580] [2020-12-22 03:54:25,434 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 03:54:25,475 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-22 03:54:25,475 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 03:54:25,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 24 conjunts are in the unsatisfiable core [2020-12-22 03:54:25,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 03:54:25,507 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 35 [2020-12-22 03:54:25,508 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-22 03:54:25,517 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-22 03:54:25,519 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2020-12-22 03:54:25,519 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:68, output treesize:59 [2020-12-22 03:56:09,219 INFO L348 Elim1Store]: treesize reduction 24, result has 11.1 percent of original size [2020-12-22 03:56:09,220 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 66 treesize of output 19 [2020-12-22 03:56:09,223 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-22 03:56:09,242 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-22 03:56:09,244 INFO L547 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-22 03:56:09,245 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:66, output treesize:5 [2020-12-22 03:56:09,324 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:56:09,324 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 03:56:09,325 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 12] total 30 [2020-12-22 03:56:09,325 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676613610] [2020-12-22 03:56:09,325 INFO L461 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-12-22 03:56:09,325 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 03:56:09,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-12-22 03:56:09,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=673, Unknown=54, NotChecked=0, Total=870 [2020-12-22 03:56:09,326 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 30 states. [2020-12-22 03:56:16,732 WARN L197 SmtUtils]: Spent 2.11 s on a formula simplification. DAG size of input: 48 DAG size of output: 45 [2020-12-22 03:56:19,136 WARN L197 SmtUtils]: Spent 2.13 s on a formula simplification. DAG size of input: 51 DAG size of output: 48 [2020-12-22 03:56:19,860 WARN L197 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 47 [2020-12-22 03:56:27,951 WARN L197 SmtUtils]: Spent 2.10 s on a formula simplification. DAG size of input: 46 DAG size of output: 43 [2020-12-22 03:56:30,598 WARN L197 SmtUtils]: Spent 2.12 s on a formula simplification. DAG size of input: 48 DAG size of output: 45 [2020-12-22 03:56:30,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 03:56:30,936 INFO L93 Difference]: Finished difference Result 99 states and 101 transitions. [2020-12-22 03:56:30,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2020-12-22 03:56:30,938 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 32 [2020-12-22 03:56:30,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 03:56:30,939 INFO L225 Difference]: With dead ends: 99 [2020-12-22 03:56:30,939 INFO L226 Difference]: Without dead ends: 94 [2020-12-22 03:56:30,942 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2007 ImplicationChecksByTransitivity, 119.9s TimeCoverageRelationStatistics Valid=1604, Invalid=5824, Unknown=54, NotChecked=0, Total=7482 [2020-12-22 03:56:30,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-12-22 03:56:30,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 38. [2020-12-22 03:56:30,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-12-22 03:56:30,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-12-22 03:56:30,964 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 32 [2020-12-22 03:56:30,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 03:56:30,964 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-12-22 03:56:30,964 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-12-22 03:56:30,964 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-12-22 03:56:30,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-12-22 03:56:30,965 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 03:56:30,965 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 03:56:31,180 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-22 03:56:31,180 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 03:56:31,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 03:56:31,181 INFO L82 PathProgramCache]: Analyzing trace with hash -586613367, now seen corresponding path program 9 times [2020-12-22 03:56:31,182 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 03:56:31,182 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [833847823] [2020-12-22 03:56:31,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 03:56:31,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 03:56:31,986 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:56:31,986 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [833847823] [2020-12-22 03:56:31,986 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1518783144] [2020-12-22 03:56:31,986 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 03:56:32,093 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2020-12-22 03:56:32,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 03:56:32,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 38 conjunts are in the unsatisfiable core [2020-12-22 03:56:32,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 03:56:32,554 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 42 [2020-12-22 03:56:32,557 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-22 03:56:32,589 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-22 03:56:32,597 INFO L547 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2020-12-22 03:56:32,597 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:95, output treesize:79 [2020-12-22 03:56:34,725 INFO L173 IndexEqualityManager]: detected equality via solver [2020-12-22 03:56:34,730 INFO L348 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-12-22 03:56:34,730 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 67 treesize of output 18 [2020-12-22 03:56:34,733 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-22 03:56:34,755 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-22 03:56:34,760 INFO L547 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2020-12-22 03:56:34,760 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 5 variables, input treesize:86, output treesize:27 [2020-12-22 03:56:40,798 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 03:56:40,799 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 03:56:40,799 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 37 [2020-12-22 03:56:40,799 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354755083] [2020-12-22 03:56:40,800 INFO L461 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-12-22 03:56:40,800 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 03:56:40,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-12-22 03:56:40,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=1163, Unknown=3, NotChecked=0, Total=1406 [2020-12-22 03:56:40,803 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 38 states. [2020-12-22 03:56:45,780 WARN L197 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 55 [2020-12-22 03:56:50,198 WARN L197 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 58 [2020-12-22 03:56:59,460 WARN L197 SmtUtils]: Spent 368.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 62 [2020-12-22 03:57:08,417 WARN L197 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 61