/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 23:02:17,494 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 23:02:17,497 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 23:02:17,535 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 23:02:17,535 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 23:02:17,539 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 23:02:17,545 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 23:02:17,547 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 23:02:17,548 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 23:02:17,549 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 23:02:17,550 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 23:02:17,551 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 23:02:17,551 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 23:02:17,552 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 23:02:17,553 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 23:02:17,554 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 23:02:17,555 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 23:02:17,556 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 23:02:17,557 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 23:02:17,559 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 23:02:17,560 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 23:02:17,561 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 23:02:17,563 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 23:02:17,563 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 23:02:17,565 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 23:02:17,573 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 23:02:17,574 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 23:02:17,574 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 23:02:17,575 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-08-22 23:02:17,584 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 23:02:17,584 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 23:02:17,586 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 23:02:17,586 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 23:02:17,586 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 23:02:17,586 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 23:02:17,586 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 23:02:17,587 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 23:02:17,587 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 23:02:17,587 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 23:02:17,587 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 23:02:17,587 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 23:02:17,588 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 23:02:17,588 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 23:02:17,588 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 23:02:17,588 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-08-22 23:02:17,588 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 23:02:17,589 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 23:02:17,589 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 23:02:17,589 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 23:02:17,589 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-08-22 23:02:17,589 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 23:02:17,590 INFO L138 SettingsManager]: * Use separate solver for trace checks=false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-08-22 23:02:17,887 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 23:02:17,900 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 23:02:17,903 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 23:02:17,905 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 23:02:17,906 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 23:02:17,907 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2020-08-22 23:02:17,969 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4462cad99/2d622cb07cf74f9b908ab1309afbd84a/FLAGce61abcf9 [2020-08-22 23:02:18,415 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 23:02:18,416 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2020-08-22 23:02:18,422 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4462cad99/2d622cb07cf74f9b908ab1309afbd84a/FLAGce61abcf9 [2020-08-22 23:02:18,837 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4462cad99/2d622cb07cf74f9b908ab1309afbd84a [2020-08-22 23:02:18,848 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 23:02:18,850 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 23:02:18,852 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 23:02:18,852 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 23:02:18,856 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 23:02:18,857 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 11:02:18" (1/1) ... [2020-08-22 23:02:18,860 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@19c9ac3c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:02:18, skipping insertion in model container [2020-08-22 23:02:18,861 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 11:02:18" (1/1) ... [2020-08-22 23:02:18,868 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 23:02:18,885 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 23:02:19,110 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 23:02:19,114 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 23:02:19,129 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 23:02:19,145 INFO L208 MainTranslator]: Completed translation [2020-08-22 23:02:19,146 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:02:19 WrapperNode [2020-08-22 23:02:19,146 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 23:02:19,147 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 23:02:19,147 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 23:02:19,147 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 23:02:19,162 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:02:19" (1/1) ... [2020-08-22 23:02:19,162 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:02:19" (1/1) ... [2020-08-22 23:02:19,168 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:02:19" (1/1) ... [2020-08-22 23:02:19,168 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:02:19" (1/1) ... [2020-08-22 23:02:19,287 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:02:19" (1/1) ... [2020-08-22 23:02:19,292 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:02:19" (1/1) ... [2020-08-22 23:02:19,299 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:02:19" (1/1) ... [2020-08-22 23:02:19,301 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 23:02:19,301 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 23:02:19,302 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 23:02:19,302 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 23:02:19,304 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:02:19" (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 [2020-08-22 23:02:19,372 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 23:02:19,372 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 23:02:19,372 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 23:02:19,372 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 23:02:19,372 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 23:02:19,372 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 23:02:19,372 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 23:02:19,373 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 23:02:19,373 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 23:02:19,532 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 23:02:19,532 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-22 23:02:19,536 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 11:02:19 BoogieIcfgContainer [2020-08-22 23:02:19,536 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 23:02:19,537 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 23:02:19,537 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 23:02:19,540 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 23:02:19,541 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 11:02:18" (1/3) ... [2020-08-22 23:02:19,542 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7284c9f2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 11:02:19, skipping insertion in model container [2020-08-22 23:02:19,542 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:02:19" (2/3) ... [2020-08-22 23:02:19,542 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7284c9f2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 11:02:19, skipping insertion in model container [2020-08-22 23:02:19,542 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 11:02:19" (3/3) ... [2020-08-22 23:02:19,544 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_1-1.c [2020-08-22 23:02:19,554 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 23:02:19,562 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 23:02:19,575 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 23:02:19,597 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 23:02:19,597 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 23:02:19,597 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 23:02:19,597 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 23:02:19,597 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 23:02:19,598 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 23:02:19,598 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 23:02:19,598 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 23:02:19,612 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-22 23:02:19,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-22 23:02:19,621 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:02:19,622 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:02:19,623 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:02:19,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:02:19,628 INFO L82 PathProgramCache]: Analyzing trace with hash 493765703, now seen corresponding path program 1 times [2020-08-22 23:02:19,635 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:02:19,635 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [561816873] [2020-08-22 23:02:19,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:02:19,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:19,739 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:02:19,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:19,745 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:02:19,746 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [561816873] [2020-08-22 23:02:19,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 23:02:19,749 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-22 23:02:19,750 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561635182] [2020-08-22 23:02:19,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-22 23:02:19,755 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:02:19,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-22 23:02:19,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-22 23:02:19,773 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-22 23:02:19,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:02:19,798 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2020-08-22 23:02:19,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-22 23:02:19,799 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2020-08-22 23:02:19,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:02:19,808 INFO L225 Difference]: With dead ends: 33 [2020-08-22 23:02:19,808 INFO L226 Difference]: Without dead ends: 16 [2020-08-22 23:02:19,811 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-22 23:02:19,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-22 23:02:19,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-22 23:02:19,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-22 23:02:19,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-22 23:02:19,847 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 11 [2020-08-22 23:02:19,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:02:19,847 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-22 23:02:19,847 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-22 23:02:19,848 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-22 23:02:19,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-22 23:02:19,849 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:02:19,849 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:02:19,849 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 23:02:19,850 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:02:19,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:02:19,850 INFO L82 PathProgramCache]: Analyzing trace with hash 486377535, now seen corresponding path program 1 times [2020-08-22 23:02:19,850 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:02:19,851 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1784113543] [2020-08-22 23:02:19,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:02:19,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:19,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:02:19,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:19,968 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:02:19,968 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1784113543] [2020-08-22 23:02:19,969 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 23:02:19,969 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 23:02:19,970 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560105291] [2020-08-22 23:02:19,972 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 23:02:19,972 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:02:19,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 23:02:19,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 23:02:19,974 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 3 states. [2020-08-22 23:02:20,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:02:20,007 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-22 23:02:20,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 23:02:20,008 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2020-08-22 23:02:20,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:02:20,010 INFO L225 Difference]: With dead ends: 24 [2020-08-22 23:02:20,010 INFO L226 Difference]: Without dead ends: 19 [2020-08-22 23:02:20,012 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 23:02:20,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-22 23:02:20,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2020-08-22 23:02:20,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-22 23:02:20,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-22 23:02:20,020 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 11 [2020-08-22 23:02:20,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:02:20,020 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-22 23:02:20,020 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 23:02:20,021 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-22 23:02:20,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-22 23:02:20,022 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:02:20,022 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:02:20,022 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 23:02:20,023 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:02:20,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:02:20,024 INFO L82 PathProgramCache]: Analyzing trace with hash -1748013841, now seen corresponding path program 1 times [2020-08-22 23:02:20,024 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:02:20,024 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [474080329] [2020-08-22 23:02:20,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:02:20,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:20,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:02:20,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:20,202 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:02:20,203 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [474080329] [2020-08-22 23:02:20,203 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:02:20,203 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 23:02:20,204 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947856742] [2020-08-22 23:02:20,204 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 23:02:20,205 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:02:20,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 23:02:20,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-22 23:02:20,206 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 6 states. [2020-08-22 23:02:20,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:02:20,251 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-22 23:02:20,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 23:02:20,252 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-22 23:02:20,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:02:20,253 INFO L225 Difference]: With dead ends: 31 [2020-08-22 23:02:20,253 INFO L226 Difference]: Without dead ends: 26 [2020-08-22 23:02:20,254 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-22 23:02:20,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-22 23:02:20,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 22. [2020-08-22 23:02:20,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-22 23:02:20,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-22 23:02:20,263 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 16 [2020-08-22 23:02:20,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:02:20,263 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-22 23:02:20,264 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 23:02:20,264 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-22 23:02:20,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-22 23:02:20,265 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:02:20,265 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:02:20,265 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 23:02:20,266 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:02:20,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:02:20,266 INFO L82 PathProgramCache]: Analyzing trace with hash 1960900159, now seen corresponding path program 2 times [2020-08-22 23:02:20,266 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:02:20,267 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1003695661] [2020-08-22 23:02:20,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:02:20,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:20,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:02:20,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:20,467 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:02:20,467 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1003695661] [2020-08-22 23:02:20,467 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:02:20,468 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 23:02:20,468 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837220725] [2020-08-22 23:02:20,468 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 23:02:20,469 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:02:20,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 23:02:20,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-08-22 23:02:20,470 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 7 states. [2020-08-22 23:02:20,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:02:20,511 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-22 23:02:20,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 23:02:20,512 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-08-22 23:02:20,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:02:20,513 INFO L225 Difference]: With dead ends: 36 [2020-08-22 23:02:20,513 INFO L226 Difference]: Without dead ends: 31 [2020-08-22 23:02:20,514 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-22 23:02:20,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-22 23:02:20,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 27. [2020-08-22 23:02:20,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-22 23:02:20,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-22 23:02:20,523 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 21 [2020-08-22 23:02:20,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:02:20,523 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-22 23:02:20,523 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 23:02:20,523 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-22 23:02:20,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-22 23:02:20,525 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:02:20,526 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:02:20,526 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 23:02:20,526 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:02:20,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:02:20,530 INFO L82 PathProgramCache]: Analyzing trace with hash 1793113839, now seen corresponding path program 3 times [2020-08-22 23:02:20,530 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:02:20,530 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1064815302] [2020-08-22 23:02:20,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:02:20,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:20,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:02:20,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:20,746 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:02:20,746 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1064815302] [2020-08-22 23:02:20,747 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:02:20,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-22 23:02:20,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658142021] [2020-08-22 23:02:20,748 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 23:02:20,748 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:02:20,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 23:02:20,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2020-08-22 23:02:20,749 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 9 states. [2020-08-22 23:02:20,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:02:20,939 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-22 23:02:20,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-22 23:02:20,940 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-22 23:02:20,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:02:20,941 INFO L225 Difference]: With dead ends: 39 [2020-08-22 23:02:20,941 INFO L226 Difference]: Without dead ends: 34 [2020-08-22 23:02:20,942 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2020-08-22 23:02:20,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-22 23:02:20,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-08-22 23:02:20,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-22 23:02:20,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-22 23:02:20,952 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 26 [2020-08-22 23:02:20,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:02:20,953 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-22 23:02:20,953 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 23:02:20,953 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-22 23:02:20,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-22 23:02:20,954 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:02:20,954 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:02:20,954 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 23:02:20,955 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:02:20,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:02:20,955 INFO L82 PathProgramCache]: Analyzing trace with hash -774708161, now seen corresponding path program 4 times [2020-08-22 23:02:20,956 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:02:20,956 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [712713546] [2020-08-22 23:02:20,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:02:20,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:21,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:02:21,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:21,122 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:02:21,123 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [712713546] [2020-08-22 23:02:21,123 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:02:21,123 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-22 23:02:21,124 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736232747] [2020-08-22 23:02:21,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 23:02:21,124 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:02:21,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 23:02:21,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2020-08-22 23:02:21,125 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 11 states. [2020-08-22 23:02:21,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:02:21,336 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-22 23:02:21,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-22 23:02:21,337 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 31 [2020-08-22 23:02:21,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:02:21,338 INFO L225 Difference]: With dead ends: 44 [2020-08-22 23:02:21,339 INFO L226 Difference]: Without dead ends: 39 [2020-08-22 23:02:21,339 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=279, Unknown=0, NotChecked=0, Total=342 [2020-08-22 23:02:21,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-22 23:02:21,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2020-08-22 23:02:21,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-22 23:02:21,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-22 23:02:21,348 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 31 [2020-08-22 23:02:21,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:02:21,349 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-22 23:02:21,349 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 23:02:21,349 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-22 23:02:21,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-22 23:02:21,350 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:02:21,350 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:02:21,351 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 23:02:21,351 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:02:21,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:02:21,351 INFO L82 PathProgramCache]: Analyzing trace with hash -1644982033, now seen corresponding path program 5 times [2020-08-22 23:02:21,352 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:02:21,352 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1468957736] [2020-08-22 23:02:21,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:02:21,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:21,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:02:21,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:21,548 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:02:21,549 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1468957736] [2020-08-22 23:02:21,549 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:02:21,549 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 23:02:21,550 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456175419] [2020-08-22 23:02:21,550 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 23:02:21,551 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:02:21,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 23:02:21,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-08-22 23:02:21,552 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 13 states. [2020-08-22 23:02:21,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:02:21,893 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-22 23:02:21,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-22 23:02:21,894 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-22 23:02:21,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:02:21,895 INFO L225 Difference]: With dead ends: 49 [2020-08-22 23:02:21,895 INFO L226 Difference]: Without dead ends: 44 [2020-08-22 23:02:21,896 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=428, Unknown=0, NotChecked=0, Total=506 [2020-08-22 23:02:21,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-22 23:02:21,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2020-08-22 23:02:21,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-22 23:02:21,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-22 23:02:21,904 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 36 [2020-08-22 23:02:21,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:02:21,905 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-22 23:02:21,905 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 23:02:21,905 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-22 23:02:21,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-22 23:02:21,906 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:02:21,907 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:02:21,907 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 23:02:21,907 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:02:21,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:02:21,907 INFO L82 PathProgramCache]: Analyzing trace with hash 330519103, now seen corresponding path program 6 times [2020-08-22 23:02:21,908 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:02:21,908 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [231656264] [2020-08-22 23:02:21,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:02:21,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 23:02:21,925 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 23:02:21,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 23:02:21,943 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 23:02:21,962 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-22 23:02:21,962 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 23:02:21,963 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 23:02:21,989 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 11:02:21 BoogieIcfgContainer [2020-08-22 23:02:21,990 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 23:02:21,992 INFO L168 Benchmark]: Toolchain (without parser) took 3141.98 ms. Allocated memory was 137.4 MB in the beginning and 248.0 MB in the end (delta: 110.6 MB). Free memory was 101.4 MB in the beginning and 203.3 MB in the end (delta: -101.9 MB). Peak memory consumption was 8.8 MB. Max. memory is 7.1 GB. [2020-08-22 23:02:21,993 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 137.4 MB. Free memory was 120.0 MB in the beginning and 119.7 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-08-22 23:02:21,994 INFO L168 Benchmark]: CACSL2BoogieTranslator took 294.21 ms. Allocated memory is still 137.4 MB. Free memory was 101.0 MB in the beginning and 91.8 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-08-22 23:02:21,995 INFO L168 Benchmark]: Boogie Preprocessor took 154.52 ms. Allocated memory was 137.4 MB in the beginning and 203.4 MB in the end (delta: 66.1 MB). Free memory was 91.8 MB in the beginning and 182.4 MB in the end (delta: -90.6 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. [2020-08-22 23:02:21,996 INFO L168 Benchmark]: RCFGBuilder took 234.81 ms. Allocated memory is still 203.4 MB. Free memory was 182.4 MB in the beginning and 170.8 MB in the end (delta: 11.6 MB). Peak memory consumption was 11.6 MB. Max. memory is 7.1 GB. [2020-08-22 23:02:21,997 INFO L168 Benchmark]: TraceAbstraction took 2452.49 ms. Allocated memory was 203.4 MB in the beginning and 248.0 MB in the end (delta: 44.6 MB). Free memory was 170.1 MB in the beginning and 203.3 MB in the end (delta: -33.1 MB). Peak memory consumption was 11.4 MB. Max. memory is 7.1 GB. [2020-08-22 23:02:22,000 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 137.4 MB. Free memory was 120.0 MB in the beginning and 119.7 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 294.21 ms. Allocated memory is still 137.4 MB. Free memory was 101.0 MB in the beginning and 91.8 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 154.52 ms. Allocated memory was 137.4 MB in the beginning and 203.4 MB in the end (delta: 66.1 MB). Free memory was 91.8 MB in the beginning and 182.4 MB in the end (delta: -90.6 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 234.81 ms. Allocated memory is still 203.4 MB. Free memory was 182.4 MB in the beginning and 170.8 MB in the end (delta: 11.6 MB). Peak memory consumption was 11.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2452.49 ms. Allocated memory was 203.4 MB in the beginning and 248.0 MB in the end (delta: 44.6 MB). Free memory was 170.1 MB in the beginning and 203.3 MB in the end (delta: -33.1 MB). Peak memory consumption was 11.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L11] unsigned int x = 0; VAL [x=0] [L12] unsigned int y = 1; VAL [x=0, y=1] [L14] COND TRUE x < 6 VAL [x=0, y=1] [L15] x++ VAL [x=1, y=1] [L16] y *= 2 VAL [x=1, y=2] [L14] COND TRUE x < 6 VAL [x=1, y=2] [L15] x++ VAL [x=2, y=2] [L16] y *= 2 VAL [x=2, y=4] [L14] COND TRUE x < 6 VAL [x=2, y=4] [L15] x++ VAL [x=3, y=4] [L16] y *= 2 VAL [x=3, y=8] [L14] COND TRUE x < 6 VAL [x=3, y=8] [L15] x++ VAL [x=4, y=8] [L16] y *= 2 VAL [x=4, y=16] [L14] COND TRUE x < 6 VAL [x=4, y=16] [L15] x++ VAL [x=5, y=16] [L16] y *= 2 VAL [x=5, y=32] [L14] COND TRUE x < 6 VAL [x=5, y=32] [L15] x++ VAL [x=6, y=32] [L16] y *= 2 VAL [x=6, y=64] [L14] COND FALSE !(x < 6) VAL [x=6, y=64] [L19] CALL __VERIFIER_assert(y != 64) VAL [\old(cond)=0] [L4] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L5] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 22 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.3s, OverallIterations: 8, TraceHistogramMax: 6, AutomataDifference: 0.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 122 SDtfs, 62 SDslu, 454 SDs, 0 SdLazy, 392 SolverSat, 27 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 91 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=42occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 7 MinimizatonAttempts, 16 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.9s InterpolantComputationTime, 193 NumberOfCodeBlocks, 193 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 145 ConstructedInterpolants, 0 QuantifiedInterpolants, 19515 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 7 InterpolantComputations, 2 PerfectInterpolantSequences, 0/115 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...