/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:45:29,898 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:45:29,900 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:45:29,913 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-07-20 11:45:29,956 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 11:45:29,981 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:45:29,982 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:45:29,984 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:45:29,984 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:45:29,984 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:45:29,984 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:45:29,985 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:45:29,985 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:45:29,985 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:45:29,985 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:45:29,986 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:45:29,986 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:45:29,987 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:45:29,987 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:45:29,987 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:45:29,987 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:45:29,988 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:45:29,988 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:45:29,988 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:45:29,988 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:45:29,988 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:45:29,988 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:45:29,989 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:45:29,989 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:45:29,989 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:45:29,989 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:45:29,989 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:29,990 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:45:29,990 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:45:29,990 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-20 11:45:30,327 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:45:30,344 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:45:30,347 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:45:30,348 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:45:30,348 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:45:30,349 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-07-20 11:45:30,417 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bf435387b/54605a21e956410b97beb28819dbd972/FLAG92461ef81 [2020-07-20 11:45:30,873 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:45:30,873 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-07-20 11:45:30,880 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bf435387b/54605a21e956410b97beb28819dbd972/FLAG92461ef81 [2020-07-20 11:45:31,260 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bf435387b/54605a21e956410b97beb28819dbd972 [2020-07-20 11:45:31,269 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:45:31,271 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:45:31,272 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:45:31,273 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:45:31,276 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:45:31,277 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:45:31" (1/1) ... [2020-07-20 11:45:31,280 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@24633c0d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:31, skipping insertion in model container [2020-07-20 11:45:31,280 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:45:31" (1/1) ... [2020-07-20 11:45:31,288 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:45:31,309 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:45:31,489 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:45:31,496 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:45:31,516 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:45:31,537 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:45:31,538 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:31 WrapperNode [2020-07-20 11:45:31,538 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:45:31,539 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:45:31,539 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:45:31,539 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:45:31,673 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:31" (1/1) ... [2020-07-20 11:45:31,674 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:31" (1/1) ... [2020-07-20 11:45:31,684 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:31" (1/1) ... [2020-07-20 11:45:31,684 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:31" (1/1) ... [2020-07-20 11:45:31,703 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:31" (1/1) ... [2020-07-20 11:45:31,712 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:31" (1/1) ... [2020-07-20 11:45:31,718 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:31" (1/1) ... [2020-07-20 11:45:31,724 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:45:31,725 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:45:31,725 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:45:31,725 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:45:31,726 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:31" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:45:31,798 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:45:31,799 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:45:31,799 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 11:45:31,799 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-07-20 11:45:31,799 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:45:31,799 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-07-20 11:45:31,799 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:45:31,800 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 11:45:31,800 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-20 11:45:31,800 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-07-20 11:45:31,801 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-07-20 11:45:31,801 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:45:31,802 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 11:45:31,802 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-07-20 11:45:31,802 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 11:45:31,803 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:45:31,803 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:45:32,058 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:45:32,058 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-20 11:45:32,062 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:45:32 BoogieIcfgContainer [2020-07-20 11:45:32,063 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:45:32,064 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:45:32,064 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:45:32,067 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:45:32,068 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:45:31" (1/3) ... [2020-07-20 11:45:32,068 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2cdaa0db and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:45:32, skipping insertion in model container [2020-07-20 11:45:32,069 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:31" (2/3) ... [2020-07-20 11:45:32,069 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2cdaa0db and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:45:32, skipping insertion in model container [2020-07-20 11:45:32,069 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:45:32" (3/3) ... [2020-07-20 11:45:32,071 INFO L109 eAbstractionObserver]: Analyzing ICFG array_of_struct_ptr_flag_init.i [2020-07-20 11:45:32,083 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:45:32,092 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:45:32,109 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:45:32,136 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:45:32,136 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:45:32,136 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:45:32,136 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:45:32,136 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:45:32,136 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:45:32,137 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:45:32,137 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:45:32,156 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 11:45:32,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 11:45:32,162 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:32,164 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:45:32,164 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:32,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:32,171 INFO L82 PathProgramCache]: Analyzing trace with hash -850547107, now seen corresponding path program 1 times [2020-07-20 11:45:32,189 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:32,190 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2073354207] [2020-07-20 11:45:32,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:32,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:32,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 11:45:32,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:32,321 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:45:32,322 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:45:32,323 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2073354207] [2020-07-20 11:45:32,324 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:45:32,324 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 11:45:32,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1857866174] [2020-07-20 11:45:32,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 11:45:32,331 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:45:32,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 11:45:32,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 11:45:32,346 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 2 states. [2020-07-20 11:45:32,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:45:32,369 INFO L93 Difference]: Finished difference Result 56 states and 71 transitions. [2020-07-20 11:45:32,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 11:45:32,371 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 20 [2020-07-20 11:45:32,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:45:32,380 INFO L225 Difference]: With dead ends: 56 [2020-07-20 11:45:32,380 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 11:45:32,384 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 11:45:32,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 11:45:32,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-20 11:45:32,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 11:45:32,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-07-20 11:45:32,445 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-07-20 11:45:32,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:45:32,446 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-07-20 11:45:32,446 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 11:45:32,446 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-07-20 11:45:32,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 11:45:32,448 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:32,449 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:45:32,663 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:32,663 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:32,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:32,664 INFO L82 PathProgramCache]: Analyzing trace with hash 1453375688, now seen corresponding path program 1 times [2020-07-20 11:45:32,665 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:32,666 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [311847019] [2020-07-20 11:45:32,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:32,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:32,727 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 11:45:32,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:32,768 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:45:32,769 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:45:32,769 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [311847019] [2020-07-20 11:45:32,769 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:45:32,770 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:45:32,770 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [61359200] [2020-07-20 11:45:32,772 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:45:32,772 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:45:32,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:45:32,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:45:32,773 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 3 states. [2020-07-20 11:45:32,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:45:32,816 INFO L93 Difference]: Finished difference Result 48 states and 57 transitions. [2020-07-20 11:45:32,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:45:32,817 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 11:45:32,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:45:32,820 INFO L225 Difference]: With dead ends: 48 [2020-07-20 11:45:32,821 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 11:45:32,822 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:45:32,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 11:45:32,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 29. [2020-07-20 11:45:32,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-20 11:45:32,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-07-20 11:45:32,833 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-07-20 11:45:32,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:45:32,834 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-07-20 11:45:32,834 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:45:32,834 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-07-20 11:45:32,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 11:45:32,835 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:32,836 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:45:33,048 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:33,049 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:33,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:33,049 INFO L82 PathProgramCache]: Analyzing trace with hash 1976547036, now seen corresponding path program 1 times [2020-07-20 11:45:33,050 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:33,050 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1557155622] [2020-07-20 11:45:33,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:33,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:33,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 11:45:33,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:33,122 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:45:33,123 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:45:33,123 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1557155622] [2020-07-20 11:45:33,123 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:45:33,123 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:45:33,124 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52454022] [2020-07-20 11:45:33,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:45:33,125 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:45:33,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:45:33,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:45:33,125 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 3 states. [2020-07-20 11:45:33,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:45:33,150 INFO L93 Difference]: Finished difference Result 47 states and 55 transitions. [2020-07-20 11:45:33,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:45:33,150 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 11:45:33,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:45:33,151 INFO L225 Difference]: With dead ends: 47 [2020-07-20 11:45:33,152 INFO L226 Difference]: Without dead ends: 29 [2020-07-20 11:45:33,152 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:45:33,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-20 11:45:33,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-07-20 11:45:33,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-20 11:45:33,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2020-07-20 11:45:33,158 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 23 [2020-07-20 11:45:33,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:45:33,159 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2020-07-20 11:45:33,159 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:45:33,159 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2020-07-20 11:45:33,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 11:45:33,160 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:33,160 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:45:33,375 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:33,376 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:33,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:33,377 INFO L82 PathProgramCache]: Analyzing trace with hash 1583520026, now seen corresponding path program 1 times [2020-07-20 11:45:33,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:33,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1089069193] [2020-07-20 11:45:33,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:33,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:33,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 11:45:33,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:33,459 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:33,459 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:45:33,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1089069193] [2020-07-20 11:45:33,460 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:45:33,461 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 11:45:33,461 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1687695659] [2020-07-20 11:45:33,462 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 11:45:33,462 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:45:33,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 11:45:33,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 11:45:33,465 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 4 states. [2020-07-20 11:45:33,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:45:33,522 INFO L93 Difference]: Finished difference Result 50 states and 56 transitions. [2020-07-20 11:45:33,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 11:45:33,523 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 23 [2020-07-20 11:45:33,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:45:33,524 INFO L225 Difference]: With dead ends: 50 [2020-07-20 11:45:33,524 INFO L226 Difference]: Without dead ends: 31 [2020-07-20 11:45:33,525 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:45:33,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-20 11:45:33,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2020-07-20 11:45:33,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 11:45:33,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2020-07-20 11:45:33,530 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 23 [2020-07-20 11:45:33,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:45:33,531 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2020-07-20 11:45:33,531 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 11:45:33,531 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2020-07-20 11:45:33,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 11:45:33,532 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:33,532 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:45:33,746 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:33,747 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:33,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:33,747 INFO L82 PathProgramCache]: Analyzing trace with hash -596099560, now seen corresponding path program 1 times [2020-07-20 11:45:33,748 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:33,748 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1357755619] [2020-07-20 11:45:33,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:33,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:33,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 11:45:33,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:33,833 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:33,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:45:33,937 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:33,939 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1357755619] [2020-07-20 11:45:33,939 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:45:33,939 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-07-20 11:45:33,940 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546263254] [2020-07-20 11:45:33,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 11:45:33,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:45:33,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 11:45:33,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2020-07-20 11:45:33,943 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand 8 states. [2020-07-20 11:45:34,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:45:34,022 INFO L93 Difference]: Finished difference Result 57 states and 65 transitions. [2020-07-20 11:45:34,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:45:34,024 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2020-07-20 11:45:34,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:45:34,025 INFO L225 Difference]: With dead ends: 57 [2020-07-20 11:45:34,025 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 11:45:34,026 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=31, Invalid=41, Unknown=0, NotChecked=0, Total=72 [2020-07-20 11:45:34,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 11:45:34,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-20 11:45:34,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 11:45:34,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2020-07-20 11:45:34,045 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 25 [2020-07-20 11:45:34,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:45:34,045 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2020-07-20 11:45:34,045 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 11:45:34,045 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2020-07-20 11:45:34,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 11:45:34,046 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:34,047 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:45:34,247 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:34,248 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:34,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:34,249 INFO L82 PathProgramCache]: Analyzing trace with hash -2129592302, now seen corresponding path program 2 times [2020-07-20 11:45:34,250 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:34,250 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [708430625] [2020-07-20 11:45:34,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:34,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:34,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:45:34,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:34,410 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:34,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:45:34,589 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:34,590 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [708430625] [2020-07-20 11:45:34,590 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:45:34,590 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2020-07-20 11:45:34,590 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534972347] [2020-07-20 11:45:34,591 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 11:45:34,591 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:45:34,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 11:45:34,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=101, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:45:34,592 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand 14 states. [2020-07-20 11:45:34,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:45:34,710 INFO L93 Difference]: Finished difference Result 69 states and 80 transitions. [2020-07-20 11:45:34,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:45:34,711 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 31 [2020-07-20 11:45:34,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:45:34,712 INFO L225 Difference]: With dead ends: 69 [2020-07-20 11:45:34,712 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 11:45:34,713 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=91, Invalid=119, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:45:34,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 11:45:34,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-07-20 11:45:34,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-20 11:45:34,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2020-07-20 11:45:34,721 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 31 [2020-07-20 11:45:34,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:45:34,722 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2020-07-20 11:45:34,722 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 11:45:34,722 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2020-07-20 11:45:34,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-20 11:45:34,723 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:34,724 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:45:34,931 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:34,932 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:34,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:34,933 INFO L82 PathProgramCache]: Analyzing trace with hash -1013024378, now seen corresponding path program 3 times [2020-07-20 11:45:34,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:34,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [600021719] [2020-07-20 11:45:34,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:35,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:35,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 11:45:35,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:35,219 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:35,219 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:45:35,656 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:35,656 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [600021719] [2020-07-20 11:45:35,657 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:45:35,657 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2020-07-20 11:45:35,657 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547592311] [2020-07-20 11:45:35,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 11:45:35,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:45:35,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 11:45:35,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=347, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:45:35,659 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 26 states. [2020-07-20 11:45:35,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:45:35,858 INFO L93 Difference]: Finished difference Result 93 states and 110 transitions. [2020-07-20 11:45:35,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 11:45:35,859 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 43 [2020-07-20 11:45:35,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:45:35,860 INFO L225 Difference]: With dead ends: 93 [2020-07-20 11:45:35,860 INFO L226 Difference]: Without dead ends: 72 [2020-07-20 11:45:35,861 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=319, Invalid=383, Unknown=0, NotChecked=0, Total=702 [2020-07-20 11:45:35,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-20 11:45:35,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2020-07-20 11:45:35,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-20 11:45:35,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 75 transitions. [2020-07-20 11:45:35,882 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 75 transitions. Word has length 43 [2020-07-20 11:45:35,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:45:35,883 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 75 transitions. [2020-07-20 11:45:35,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 11:45:35,883 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 75 transitions. [2020-07-20 11:45:35,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 11:45:35,888 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:35,888 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:45:36,089 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:36,090 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:36,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:36,090 INFO L82 PathProgramCache]: Analyzing trace with hash 32686702, now seen corresponding path program 4 times [2020-07-20 11:45:36,091 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:36,091 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [75516308] [2020-07-20 11:45:36,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:36,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:36,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 11:45:36,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:36,775 INFO L134 CoverageAnalysis]: Checked inductivity of 485 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:36,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:45:38,268 INFO L134 CoverageAnalysis]: Checked inductivity of 485 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:38,268 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [75516308] [2020-07-20 11:45:38,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:45:38,269 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 50 [2020-07-20 11:45:38,269 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198634303] [2020-07-20 11:45:38,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-20 11:45:38,270 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:45:38,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-20 11:45:38,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1179, Invalid=1271, Unknown=0, NotChecked=0, Total=2450 [2020-07-20 11:45:38,271 INFO L87 Difference]: Start difference. First operand 72 states and 75 transitions. Second operand 50 states. [2020-07-20 11:45:38,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:45:38,617 INFO L93 Difference]: Finished difference Result 141 states and 170 transitions. [2020-07-20 11:45:38,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-20 11:45:38,618 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 67 [2020-07-20 11:45:38,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:45:38,621 INFO L225 Difference]: With dead ends: 141 [2020-07-20 11:45:38,621 INFO L226 Difference]: Without dead ends: 120 [2020-07-20 11:45:38,623 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1207, Invalid=1343, Unknown=0, NotChecked=0, Total=2550 [2020-07-20 11:45:38,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-07-20 11:45:38,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2020-07-20 11:45:38,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-07-20 11:45:38,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 123 transitions. [2020-07-20 11:45:38,648 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 123 transitions. Word has length 67 [2020-07-20 11:45:38,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:45:38,653 INFO L479 AbstractCegarLoop]: Abstraction has 120 states and 123 transitions. [2020-07-20 11:45:38,653 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-20 11:45:38,654 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 123 transitions. [2020-07-20 11:45:38,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2020-07-20 11:45:38,655 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:38,656 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:45:38,856 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:38,857 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:38,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:38,858 INFO L82 PathProgramCache]: Analyzing trace with hash -200496066, now seen corresponding path program 5 times [2020-07-20 11:45:38,858 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:38,859 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [368791308] [2020-07-20 11:45:38,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:38,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:38,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 695 conjuncts, 50 conjunts are in the unsatisfiable core [2020-07-20 11:45:39,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:40,706 INFO L134 CoverageAnalysis]: Checked inductivity of 2117 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:40,706 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:45:40,910 WARN L193 SmtUtils]: Spent 197.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2020-07-20 11:45:41,096 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2020-07-20 11:45:46,050 INFO L134 CoverageAnalysis]: Checked inductivity of 2117 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:46,050 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [368791308] [2020-07-20 11:45:46,050 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:45:46,051 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50] total 98 [2020-07-20 11:45:46,051 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156032652] [2020-07-20 11:45:46,052 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2020-07-20 11:45:46,052 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:45:46,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2020-07-20 11:45:46,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4659, Invalid=4847, Unknown=0, NotChecked=0, Total=9506 [2020-07-20 11:45:46,058 INFO L87 Difference]: Start difference. First operand 120 states and 123 transitions. Second operand 98 states. [2020-07-20 11:45:46,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:45:46,999 INFO L93 Difference]: Finished difference Result 237 states and 290 transitions. [2020-07-20 11:45:47,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2020-07-20 11:45:47,001 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 115 [2020-07-20 11:45:47,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:45:47,004 INFO L225 Difference]: With dead ends: 237 [2020-07-20 11:45:47,010 INFO L226 Difference]: Without dead ends: 216 [2020-07-20 11:45:47,016 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 132 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=4711, Invalid=4991, Unknown=0, NotChecked=0, Total=9702 [2020-07-20 11:45:47,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2020-07-20 11:45:47,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 216. [2020-07-20 11:45:47,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2020-07-20 11:45:47,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 219 transitions. [2020-07-20 11:45:47,042 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 219 transitions. Word has length 115 [2020-07-20 11:45:47,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:45:47,043 INFO L479 AbstractCegarLoop]: Abstraction has 216 states and 219 transitions. [2020-07-20 11:45:47,043 INFO L480 AbstractCegarLoop]: Interpolant automaton has 98 states. [2020-07-20 11:45:47,043 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 219 transitions. [2020-07-20 11:45:47,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 212 [2020-07-20 11:45:47,047 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:47,047 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:45:47,253 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:47,254 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:47,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:47,255 INFO L82 PathProgramCache]: Analyzing trace with hash 1449517022, now seen corresponding path program 6 times [2020-07-20 11:45:47,256 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:47,256 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [767367157] [2020-07-20 11:45:47,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:47,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:47,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 1319 conjuncts, 98 conjunts are in the unsatisfiable core [2020-07-20 11:45:47,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:53,890 INFO L134 CoverageAnalysis]: Checked inductivity of 8837 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:53,890 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:45:54,437 WARN L193 SmtUtils]: Spent 538.00 ms on a formula simplification that was a NOOP. DAG size: 292 [2020-07-20 11:45:55,014 WARN L193 SmtUtils]: Spent 569.00 ms on a formula simplification that was a NOOP. DAG size: 292 [2020-07-20 11:46:16,428 INFO L134 CoverageAnalysis]: Checked inductivity of 8837 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:46:16,429 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [767367157] [2020-07-20 11:46:16,429 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:46:16,430 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98] total 194 [2020-07-20 11:46:16,430 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901040838] [2020-07-20 11:46:16,431 INFO L459 AbstractCegarLoop]: Interpolant automaton has 194 states [2020-07-20 11:46:16,431 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:46:16,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 194 interpolants. [2020-07-20 11:46:16,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18531, Invalid=18911, Unknown=0, NotChecked=0, Total=37442 [2020-07-20 11:46:16,454 INFO L87 Difference]: Start difference. First operand 216 states and 219 transitions. Second operand 194 states. [2020-07-20 11:46:21,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:46:21,196 INFO L93 Difference]: Finished difference Result 429 states and 530 transitions. [2020-07-20 11:46:21,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 194 states. [2020-07-20 11:46:21,197 INFO L78 Accepts]: Start accepts. Automaton has 194 states. Word has length 211 [2020-07-20 11:46:21,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:46:21,200 INFO L225 Difference]: With dead ends: 429 [2020-07-20 11:46:21,200 INFO L226 Difference]: Without dead ends: 408 [2020-07-20 11:46:21,203 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 422 GetRequests, 228 SyntacticMatches, 1 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 27.4s TimeCoverageRelationStatistics Valid=18631, Invalid=19199, Unknown=0, NotChecked=0, Total=37830 [2020-07-20 11:46:21,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2020-07-20 11:46:21,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 408. [2020-07-20 11:46:21,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 408 states. [2020-07-20 11:46:21,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 411 transitions. [2020-07-20 11:46:21,223 INFO L78 Accepts]: Start accepts. Automaton has 408 states and 411 transitions. Word has length 211 [2020-07-20 11:46:21,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:46:21,224 INFO L479 AbstractCegarLoop]: Abstraction has 408 states and 411 transitions. [2020-07-20 11:46:21,224 INFO L480 AbstractCegarLoop]: Interpolant automaton has 194 states. [2020-07-20 11:46:21,224 INFO L276 IsEmpty]: Start isEmpty. Operand 408 states and 411 transitions. [2020-07-20 11:46:21,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 404 [2020-07-20 11:46:21,231 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:46:21,232 INFO L422 BasicCegarLoop]: trace histogram [190, 190, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:46:21,444 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:46:21,445 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:46:21,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:46:21,446 INFO L82 PathProgramCache]: Analyzing trace with hash -1766996194, now seen corresponding path program 7 times [2020-07-20 11:46:21,447 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:46:21,447 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [489558327] [2020-07-20 11:46:21,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:46:21,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:46:21,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 2567 conjuncts, 194 conjunts are in the unsatisfiable core [2020-07-20 11:46:21,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:46:50,938 INFO L134 CoverageAnalysis]: Checked inductivity of 36101 backedges. 0 proven. 36100 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:46:50,939 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:46:53,126 WARN L193 SmtUtils]: Spent 2.17 s on a formula simplification that was a NOOP. DAG size: 580 [2020-07-20 11:46:55,290 WARN L193 SmtUtils]: Spent 2.15 s on a formula simplification that was a NOOP. DAG size: 580 [2020-07-20 11:49:20,599 INFO L134 CoverageAnalysis]: Checked inductivity of 36101 backedges. 0 proven. 36100 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:49:20,610 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [489558327] [2020-07-20 11:49:20,610 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:49:20,610 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [194, 194] total 386 [2020-07-20 11:49:20,611 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012133973] [2020-07-20 11:49:20,613 INFO L459 AbstractCegarLoop]: Interpolant automaton has 386 states [2020-07-20 11:49:20,613 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:49:20,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 386 interpolants. [2020-07-20 11:49:20,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73923, Invalid=74687, Unknown=0, NotChecked=0, Total=148610 [2020-07-20 11:49:20,635 INFO L87 Difference]: Start difference. First operand 408 states and 411 transitions. Second operand 386 states. [2020-07-20 11:50:05,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:50:05,721 INFO L93 Difference]: Finished difference Result 813 states and 1010 transitions. [2020-07-20 11:50:05,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 386 states. [2020-07-20 11:50:05,724 INFO L78 Accepts]: Start accepts. Automaton has 386 states. Word has length 403 [2020-07-20 11:50:05,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:50:05,728 INFO L225 Difference]: With dead ends: 813 [2020-07-20 11:50:05,728 INFO L226 Difference]: Without dead ends: 792 [2020-07-20 11:50:05,735 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 806 GetRequests, 420 SyntacticMatches, 1 SemanticMatches, 385 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 173.8s TimeCoverageRelationStatistics Valid=74119, Invalid=75263, Unknown=0, NotChecked=0, Total=149382 [2020-07-20 11:50:05,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 792 states. [2020-07-20 11:50:05,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 792 to 792. [2020-07-20 11:50:05,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 792 states. [2020-07-20 11:50:05,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 792 states to 792 states and 795 transitions. [2020-07-20 11:50:05,774 INFO L78 Accepts]: Start accepts. Automaton has 792 states and 795 transitions. Word has length 403 [2020-07-20 11:50:05,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:50:05,775 INFO L479 AbstractCegarLoop]: Abstraction has 792 states and 795 transitions. [2020-07-20 11:50:05,775 INFO L480 AbstractCegarLoop]: Interpolant automaton has 386 states. [2020-07-20 11:50:05,775 INFO L276 IsEmpty]: Start isEmpty. Operand 792 states and 795 transitions. [2020-07-20 11:50:05,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 788 [2020-07-20 11:50:05,799 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:50:05,799 INFO L422 BasicCegarLoop]: trace histogram [382, 382, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:50:06,012 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:50:06,013 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:50:06,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:50:06,014 INFO L82 PathProgramCache]: Analyzing trace with hash 496211358, now seen corresponding path program 8 times [2020-07-20 11:50:06,014 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:50:06,014 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [527349379] [2020-07-20 11:50:06,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:50:06,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:50:06,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 5063 conjuncts, 386 conjunts are in the unsatisfiable core [2020-07-20 11:50:06,931 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:54:17,661 INFO L134 CoverageAnalysis]: Checked inductivity of 145925 backedges. 0 proven. 145924 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:54:17,661 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:54:26,501 WARN L193 SmtUtils]: Spent 8.79 s on a formula simplification that was a NOOP. DAG size: 1156 [2020-07-20 11:54:35,402 WARN L193 SmtUtils]: Spent 8.86 s on a formula simplification that was a NOOP. DAG size: 1156