/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-new/count_by_1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 12:03:43,716 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 12:03:43,719 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 12:03:43,732 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 12:03:43,732 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 12:03:43,733 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 12:03:43,734 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 12:03:43,736 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 12:03:43,738 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 12:03:43,743 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 12:03:43,744 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 12:03:43,745 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 12:03:43,745 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 12:03:43,746 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 12:03:43,747 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 12:03:43,748 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 12:03:43,749 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 12:03:43,750 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 12:03:43,752 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 12:03:43,754 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 12:03:43,755 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 12:03:43,756 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 12:03:43,757 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 12:03:43,758 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 12:03:43,760 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 12:03:43,767 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 12:03:43,768 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 12:03:43,769 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 12:03:43,770 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 12:03:43,785 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 12:03:43,785 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 12:03:43,787 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 12:03:43,787 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 12:03:43,787 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 12:03:43,787 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 12:03:43,788 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 12:03:43,788 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 12:03:43,788 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 12:03:43,788 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 12:03:43,788 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 12:03:43,789 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 12:03:43,789 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 12:03:43,789 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 12:03:43,789 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 12:03:43,789 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 12:03:43,789 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 12:03:43,790 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 12:03:43,790 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 12:03:43,790 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 12:03:43,790 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 12:03:43,790 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 12:03:43,791 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 12:03:43,791 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 12:03:43,791 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 12:03:43,791 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 12:03:43,791 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:03:43,792 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 12:03:43,792 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 12:03:43,792 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 12:03:44,098 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 12:03:44,113 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 12:03:44,116 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 12:03:44,118 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 12:03:44,118 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 12:03:44,120 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-new/count_by_1.i [2020-07-20 12:03:44,198 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e674a3b5a/932a8cf6408f4a2c811e39731d53b778/FLAGcaccf0966 [2020-07-20 12:03:44,699 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 12:03:44,699 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_1.i [2020-07-20 12:03:44,705 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e674a3b5a/932a8cf6408f4a2c811e39731d53b778/FLAGcaccf0966 [2020-07-20 12:03:45,134 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e674a3b5a/932a8cf6408f4a2c811e39731d53b778 [2020-07-20 12:03:45,147 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 12:03:45,151 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 12:03:45,155 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 12:03:45,156 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 12:03:45,159 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 12:03:45,161 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 12:03:45" (1/1) ... [2020-07-20 12:03:45,164 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4abea034 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:03:45, skipping insertion in model container [2020-07-20 12:03:45,164 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 12:03:45" (1/1) ... [2020-07-20 12:03:45,173 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 12:03:45,192 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 12:03:45,405 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 12:03:45,408 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 12:03:45,422 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 12:03:45,436 INFO L208 MainTranslator]: Completed translation [2020-07-20 12:03:45,437 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:03:45 WrapperNode [2020-07-20 12:03:45,437 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 12:03:45,438 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 12:03:45,438 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 12:03:45,438 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 12:03:45,449 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:03:45" (1/1) ... [2020-07-20 12:03:45,450 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:03:45" (1/1) ... [2020-07-20 12:03:45,545 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:03:45" (1/1) ... [2020-07-20 12:03:45,546 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:03:45" (1/1) ... [2020-07-20 12:03:45,550 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:03:45" (1/1) ... [2020-07-20 12:03:45,555 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:03:45" (1/1) ... [2020-07-20 12:03:45,556 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:03:45" (1/1) ... [2020-07-20 12:03:45,557 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 12:03:45,559 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 12:03:45,559 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 12:03:45,559 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 12:03:45,560 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:03:45" (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 12:03:45,632 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 12:03:45,632 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 12:03:45,632 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 12:03:45,633 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 12:03:45,633 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 12:03:45,633 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 12:03:45,633 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 12:03:45,633 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 12:03:45,633 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 12:03:45,633 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 12:03:45,634 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 12:03:45,634 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 12:03:45,634 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 12:03:45,835 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 12:03:45,836 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 12:03:45,844 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 12:03:45 BoogieIcfgContainer [2020-07-20 12:03:45,846 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 12:03:45,848 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 12:03:45,849 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 12:03:45,860 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 12:03:45,861 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 12:03:45" (1/3) ... [2020-07-20 12:03:45,866 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ec850fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 12:03:45, skipping insertion in model container [2020-07-20 12:03:45,866 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:03:45" (2/3) ... [2020-07-20 12:03:45,869 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ec850fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 12:03:45, skipping insertion in model container [2020-07-20 12:03:45,870 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 12:03:45" (3/3) ... [2020-07-20 12:03:45,875 INFO L109 eAbstractionObserver]: Analyzing ICFG count_by_1.i [2020-07-20 12:03:45,909 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 12:03:45,922 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 12:03:45,956 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 12:03:45,996 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 12:03:45,996 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 12:03:45,996 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 12:03:45,996 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 12:03:45,996 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 12:03:45,996 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 12:03:45,997 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 12:03:45,997 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 12:03:46,012 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-07-20 12:03:46,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-20 12:03:46,018 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:03:46,019 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:03:46,020 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:03:46,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:03:46,027 INFO L82 PathProgramCache]: Analyzing trace with hash 650151859, now seen corresponding path program 1 times [2020-07-20 12:03:46,037 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:03:46,037 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [499118201] [2020-07-20 12:03:46,038 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 12:03:46,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:03:46,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:03:46,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:03:46,187 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 12:03:46,188 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:03:46,189 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [499118201] [2020-07-20 12:03:46,191 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:03:46,191 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:03:46,193 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [691544801] [2020-07-20 12:03:46,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:03:46,201 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:03:46,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:03:46,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:03:46,221 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-07-20 12:03:46,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:03:46,275 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2020-07-20 12:03:46,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:03:46,277 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-07-20 12:03:46,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:03:46,288 INFO L225 Difference]: With dead ends: 33 [2020-07-20 12:03:46,289 INFO L226 Difference]: Without dead ends: 14 [2020-07-20 12:03:46,295 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 8 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 12:03:46,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-20 12:03:46,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2020-07-20 12:03:46,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-07-20 12:03:46,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-07-20 12:03:46,334 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2020-07-20 12:03:46,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:03:46,334 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-07-20 12:03:46,335 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:03:46,335 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-07-20 12:03:46,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-20 12:03:46,336 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:03:46,336 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:03:46,537 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:03:46,538 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:03:46,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:03:46,539 INFO L82 PathProgramCache]: Analyzing trace with hash -1133927695, now seen corresponding path program 1 times [2020-07-20 12:03:46,540 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:03:46,540 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1628024684] [2020-07-20 12:03:46,541 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 12:03:46,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:03:46,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 25 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 12:03:46,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:03:46,607 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:03:46,608 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:03:46,647 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:03:46,648 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1628024684] [2020-07-20 12:03:46,648 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:03:46,649 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-20 12:03:46,649 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901160264] [2020-07-20 12:03:46,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 12:03:46,651 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:03:46,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 12:03:46,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 12:03:46,652 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 6 states. [2020-07-20 12:03:46,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:03:46,699 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2020-07-20 12:03:46,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 12:03:46,700 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2020-07-20 12:03:46,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:03:46,701 INFO L225 Difference]: With dead ends: 24 [2020-07-20 12:03:46,701 INFO L226 Difference]: Without dead ends: 19 [2020-07-20 12:03:46,703 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 12:03:46,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-07-20 12:03:46,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-07-20 12:03:46,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-07-20 12:03:46,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-07-20 12:03:46,709 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 12 [2020-07-20 12:03:46,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:03:46,709 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-07-20 12:03:46,709 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 12:03:46,710 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-07-20 12:03:46,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 12:03:46,711 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:03:46,711 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:03:46,925 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:03:46,926 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:03:46,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:03:46,928 INFO L82 PathProgramCache]: Analyzing trace with hash -1338939477, now seen corresponding path program 2 times [2020-07-20 12:03:46,929 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:03:46,929 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [44115262] [2020-07-20 12:03:46,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 12:03:46,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:03:46,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 12:03:46,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:03:47,023 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:03:47,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:03:47,111 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:03:47,112 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [44115262] [2020-07-20 12:03:47,112 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:03:47,112 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 12:03:47,113 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657913984] [2020-07-20 12:03:47,113 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 12:03:47,114 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:03:47,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 12:03:47,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-20 12:03:47,115 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 12 states. [2020-07-20 12:03:47,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:03:47,176 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2020-07-20 12:03:47,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 12:03:47,177 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 18 [2020-07-20 12:03:47,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:03:47,178 INFO L225 Difference]: With dead ends: 36 [2020-07-20 12:03:47,178 INFO L226 Difference]: Without dead ends: 31 [2020-07-20 12:03:47,179 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-20 12:03:47,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-20 12:03:47,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-07-20 12:03:47,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 12:03:47,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-07-20 12:03:47,188 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 18 [2020-07-20 12:03:47,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:03:47,189 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-07-20 12:03:47,189 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 12:03:47,189 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-07-20 12:03:47,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-20 12:03:47,190 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:03:47,191 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:03:47,405 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:03:47,405 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:03:47,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:03:47,406 INFO L82 PathProgramCache]: Analyzing trace with hash 1154594463, now seen corresponding path program 3 times [2020-07-20 12:03:47,406 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:03:47,407 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [196173223] [2020-07-20 12:03:47,407 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 12:03:47,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:03:47,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 12:03:47,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:03:47,606 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:03:47,607 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:03:47,882 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:03:47,883 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [196173223] [2020-07-20 12:03:47,883 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:03:47,883 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-20 12:03:47,883 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965002308] [2020-07-20 12:03:47,885 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 12:03:47,885 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:03:47,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 12:03:47,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-20 12:03:47,887 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 24 states. [2020-07-20 12:03:48,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:03:48,028 INFO L93 Difference]: Finished difference Result 60 states and 71 transitions. [2020-07-20 12:03:48,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 12:03:48,029 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 30 [2020-07-20 12:03:48,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:03:48,031 INFO L225 Difference]: With dead ends: 60 [2020-07-20 12:03:48,031 INFO L226 Difference]: Without dead ends: 55 [2020-07-20 12:03:48,032 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-20 12:03:48,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-07-20 12:03:48,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-07-20 12:03:48,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 12:03:48,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-07-20 12:03:48,052 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 30 [2020-07-20 12:03:48,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:03:48,054 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-07-20 12:03:48,054 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 12:03:48,055 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-07-20 12:03:48,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-20 12:03:48,060 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:03:48,061 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:03:48,274 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:03:48,275 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:03:48,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:03:48,276 INFO L82 PathProgramCache]: Analyzing trace with hash -1804670329, now seen corresponding path program 4 times [2020-07-20 12:03:48,277 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:03:48,278 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1490659112] [2020-07-20 12:03:48,278 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 12:03:48,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:03:48,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 12:03:48,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:03:48,747 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:03:48,748 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:03:49,718 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:03:49,719 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1490659112] [2020-07-20 12:03:49,719 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:03:49,719 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48 [2020-07-20 12:03:49,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126243510] [2020-07-20 12:03:49,720 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-20 12:03:49,721 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:03:49,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-20 12:03:49,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 12:03:49,723 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 48 states. [2020-07-20 12:03:49,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:03:49,920 INFO L93 Difference]: Finished difference Result 108 states and 131 transitions. [2020-07-20 12:03:49,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-20 12:03:49,920 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 54 [2020-07-20 12:03:49,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:03:49,922 INFO L225 Difference]: With dead ends: 108 [2020-07-20 12:03:49,922 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 12:03:49,924 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 12:03:49,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 12:03:49,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2020-07-20 12:03:49,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-07-20 12:03:49,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 103 transitions. [2020-07-20 12:03:49,938 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 103 transitions. Word has length 54 [2020-07-20 12:03:49,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:03:49,939 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 103 transitions. [2020-07-20 12:03:49,939 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-20 12:03:49,939 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 103 transitions. [2020-07-20 12:03:49,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-07-20 12:03:49,941 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:03:49,941 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:03:50,154 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:03:50,155 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:03:50,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:03:50,157 INFO L82 PathProgramCache]: Analyzing trace with hash 1210559063, now seen corresponding path program 5 times [2020-07-20 12:03:50,158 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:03:50,158 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [403286175] [2020-07-20 12:03:50,158 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 12:03:50,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:03:50,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-20 12:03:50,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:03:51,481 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:03:51,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:03:55,248 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:03:55,249 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [403286175] [2020-07-20 12:03:55,250 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:03:55,250 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 96 [2020-07-20 12:03:55,251 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892513247] [2020-07-20 12:03:55,255 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2020-07-20 12:03:55,255 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:03:55,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2020-07-20 12:03:55,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-20 12:03:55,265 INFO L87 Difference]: Start difference. First operand 103 states and 103 transitions. Second operand 96 states. [2020-07-20 12:03:55,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:03:55,845 INFO L93 Difference]: Finished difference Result 204 states and 251 transitions. [2020-07-20 12:03:55,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-20 12:03:55,846 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 102 [2020-07-20 12:03:55,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:03:55,849 INFO L225 Difference]: With dead ends: 204 [2020-07-20 12:03:55,849 INFO L226 Difference]: Without dead ends: 199 [2020-07-20 12:03:55,857 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-20 12:03:55,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2020-07-20 12:03:55,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 199. [2020-07-20 12:03:55,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2020-07-20 12:03:55,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 199 transitions. [2020-07-20 12:03:55,896 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 199 transitions. Word has length 102 [2020-07-20 12:03:55,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:03:55,897 INFO L479 AbstractCegarLoop]: Abstraction has 199 states and 199 transitions. [2020-07-20 12:03:55,897 INFO L480 AbstractCegarLoop]: Interpolant automaton has 96 states. [2020-07-20 12:03:55,897 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 199 transitions. [2020-07-20 12:03:55,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2020-07-20 12:03:55,906 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:03:55,906 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:03:56,107 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:03:56,108 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:03:56,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:03:56,109 INFO L82 PathProgramCache]: Analyzing trace with hash 2113047031, now seen corresponding path program 6 times [2020-07-20 12:03:56,110 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:03:56,110 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2083912632] [2020-07-20 12:03:56,110 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 12:03:56,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:03:56,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 96 conjunts are in the unsatisfiable core [2020-07-20 12:03:56,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:04:00,911 INFO L134 CoverageAnalysis]: Checked inductivity of 8836 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:04:00,912 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:04:15,079 INFO L134 CoverageAnalysis]: Checked inductivity of 8836 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:04:15,080 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2083912632] [2020-07-20 12:04:15,080 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:04:15,080 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97] total 192 [2020-07-20 12:04:15,080 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846343483] [2020-07-20 12:04:15,081 INFO L459 AbstractCegarLoop]: Interpolant automaton has 192 states [2020-07-20 12:04:15,081 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:04:15,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 192 interpolants. [2020-07-20 12:04:15,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18336, Invalid=18336, Unknown=0, NotChecked=0, Total=36672 [2020-07-20 12:04:15,093 INFO L87 Difference]: Start difference. First operand 199 states and 199 transitions. Second operand 192 states. [2020-07-20 12:04:16,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:04:16,222 INFO L93 Difference]: Finished difference Result 396 states and 491 transitions. [2020-07-20 12:04:16,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 192 states. [2020-07-20 12:04:16,222 INFO L78 Accepts]: Start accepts. Automaton has 192 states. Word has length 198 [2020-07-20 12:04:16,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:04:16,229 INFO L225 Difference]: With dead ends: 396 [2020-07-20 12:04:16,229 INFO L226 Difference]: Without dead ends: 391 [2020-07-20 12:04:16,236 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 205 SyntacticMatches, 0 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 18.6s TimeCoverageRelationStatistics Valid=18336, Invalid=18336, Unknown=0, NotChecked=0, Total=36672 [2020-07-20 12:04:16,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 391 states. [2020-07-20 12:04:16,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 391 to 391. [2020-07-20 12:04:16,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 391 states. [2020-07-20 12:04:16,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 391 transitions. [2020-07-20 12:04:16,271 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 391 transitions. Word has length 198 [2020-07-20 12:04:16,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:04:16,273 INFO L479 AbstractCegarLoop]: Abstraction has 391 states and 391 transitions. [2020-07-20 12:04:16,273 INFO L480 AbstractCegarLoop]: Interpolant automaton has 192 states. [2020-07-20 12:04:16,274 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 391 transitions. [2020-07-20 12:04:16,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 391 [2020-07-20 12:04:16,282 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:04:16,282 INFO L422 BasicCegarLoop]: trace histogram [190, 190, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:04:16,498 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:04:16,500 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:04:16,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:04:16,501 INFO L82 PathProgramCache]: Analyzing trace with hash 1173211447, now seen corresponding path program 7 times [2020-07-20 12:04:16,501 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:04:16,501 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [664279922] [2020-07-20 12:04:16,502 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 12:04:16,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:04:16,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 592 conjuncts, 192 conjunts are in the unsatisfiable core [2020-07-20 12:04:16,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:04:36,214 INFO L134 CoverageAnalysis]: Checked inductivity of 36100 backedges. 0 proven. 36100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:04:36,214 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:05:39,492 INFO L134 CoverageAnalysis]: Checked inductivity of 36100 backedges. 0 proven. 36100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:05:39,493 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [664279922] [2020-07-20 12:05:39,493 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:05:39,493 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [193, 193] total 384 [2020-07-20 12:05:39,493 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1392190565] [2020-07-20 12:05:39,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 384 states [2020-07-20 12:05:39,495 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:05:39,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 384 interpolants. [2020-07-20 12:05:39,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73536, Invalid=73536, Unknown=0, NotChecked=0, Total=147072 [2020-07-20 12:05:39,521 INFO L87 Difference]: Start difference. First operand 391 states and 391 transitions. Second operand 384 states. [2020-07-20 12:05:45,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:05:45,860 INFO L93 Difference]: Finished difference Result 780 states and 971 transitions. [2020-07-20 12:05:45,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 384 states. [2020-07-20 12:05:45,861 INFO L78 Accepts]: Start accepts. Automaton has 384 states. Word has length 390 [2020-07-20 12:05:45,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:05:45,866 INFO L225 Difference]: With dead ends: 780 [2020-07-20 12:05:45,866 INFO L226 Difference]: Without dead ends: 775 [2020-07-20 12:05:45,873 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 779 GetRequests, 397 SyntacticMatches, 0 SemanticMatches, 382 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 82.3s TimeCoverageRelationStatistics Valid=73536, Invalid=73536, Unknown=0, NotChecked=0, Total=147072 [2020-07-20 12:05:45,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 775 states. [2020-07-20 12:05:45,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 775 to 775. [2020-07-20 12:05:45,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 775 states. [2020-07-20 12:05:45,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 775 states to 775 states and 775 transitions. [2020-07-20 12:05:45,896 INFO L78 Accepts]: Start accepts. Automaton has 775 states and 775 transitions. Word has length 390 [2020-07-20 12:05:45,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:05:45,897 INFO L479 AbstractCegarLoop]: Abstraction has 775 states and 775 transitions. [2020-07-20 12:05:45,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 384 states. [2020-07-20 12:05:45,898 INFO L276 IsEmpty]: Start isEmpty. Operand 775 states and 775 transitions. [2020-07-20 12:05:45,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 775 [2020-07-20 12:05:45,922 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:05:45,923 INFO L422 BasicCegarLoop]: trace histogram [382, 382, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:05:46,137 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:05:46,137 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:05:46,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:05:46,139 INFO L82 PathProgramCache]: Analyzing trace with hash 1601849271, now seen corresponding path program 8 times [2020-07-20 12:05:46,139 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:05:46,140 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1205749467] [2020-07-20 12:05:46,140 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 12:05:46,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:05:46,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 1168 conjuncts, 384 conjunts are in the unsatisfiable core [2020-07-20 12:05:46,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:07:18,064 INFO L134 CoverageAnalysis]: Checked inductivity of 145924 backedges. 0 proven. 145924 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:07:18,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:14:01,050 INFO L134 CoverageAnalysis]: Checked inductivity of 145924 backedges. 0 proven. 145924 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:14:01,051 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1205749467] [2020-07-20 12:14:01,051 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:14:01,051 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [385, 385] total 768 [2020-07-20 12:14:01,052 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779018999] [2020-07-20 12:14:01,054 INFO L459 AbstractCegarLoop]: Interpolant automaton has 768 states [2020-07-20 12:14:01,054 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:14:01,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 768 interpolants. [2020-07-20 12:14:01,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=294528, Invalid=294528, Unknown=0, NotChecked=0, Total=589056 [2020-07-20 12:14:01,122 INFO L87 Difference]: Start difference. First operand 775 states and 775 transitions. Second operand 768 states. [2020-07-20 12:15:27,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:15:27,083 INFO L93 Difference]: Finished difference Result 1548 states and 1931 transitions. [2020-07-20 12:15:27,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 768 states. [2020-07-20 12:15:27,088 INFO L78 Accepts]: Start accepts. Automaton has 768 states. Word has length 774 [2020-07-20 12:15:27,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:15:27,098 INFO L225 Difference]: With dead ends: 1548 [2020-07-20 12:15:27,098 INFO L226 Difference]: Without dead ends: 1543 [2020-07-20 12:15:27,121 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1547 GetRequests, 781 SyntacticMatches, 0 SemanticMatches, 766 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 493.4s TimeCoverageRelationStatistics Valid=294528, Invalid=294528, Unknown=0, NotChecked=0, Total=589056 [2020-07-20 12:15:27,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1543 states. [2020-07-20 12:15:27,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1543 to 1543. [2020-07-20 12:15:27,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1543 states. [2020-07-20 12:15:27,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1543 states to 1543 states and 1543 transitions. [2020-07-20 12:15:27,161 INFO L78 Accepts]: Start accepts. Automaton has 1543 states and 1543 transitions. Word has length 774 [2020-07-20 12:15:27,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:15:27,163 INFO L479 AbstractCegarLoop]: Abstraction has 1543 states and 1543 transitions. [2020-07-20 12:15:27,163 INFO L480 AbstractCegarLoop]: Interpolant automaton has 768 states. [2020-07-20 12:15:27,163 INFO L276 IsEmpty]: Start isEmpty. Operand 1543 states and 1543 transitions. [2020-07-20 12:15:27,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1543 [2020-07-20 12:15:27,187 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:15:27,187 INFO L422 BasicCegarLoop]: trace histogram [766, 766, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:15:27,388 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:15:27,389 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:15:27,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:15:27,391 INFO L82 PathProgramCache]: Analyzing trace with hash 2028684471, now seen corresponding path program 9 times [2020-07-20 12:15:27,391 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:15:27,391 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [67127223] [2020-07-20 12:15:27,392 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 12:15:27,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:15:27,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 2320 conjuncts, 768 conjunts are in the unsatisfiable core [2020-07-20 12:15:27,861 INFO L286 TraceCheckSpWp]: Computing forward predicates...