/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-invariants/eq1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-3af5e1f [2020-09-04 23:24:21,899 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 23:24:21,903 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 23:24:21,950 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-09-04 23:24:21,977 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 23:24:21,980 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 23:24:21,983 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 23:24:21,985 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 23:24:21,986 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 23:24:21,988 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 23:24:21,990 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 23:24:21,998 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 23:24:22,000 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 23:24:22,001 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 23:24:22,003 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 23:24:22,004 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 23:24:22,007 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-04 23:24:22,018 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 23:24:22,019 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 23:24:22,021 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 23:24:22,022 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-09-04 23:24:22,037 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 23:24:22,037 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 23:24:22,040 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 23:24:22,040 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 23:24:22,040 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 23:24:22,040 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 23:24:22,041 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 23:24:22,041 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 23:24:22,041 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 23:24:22,041 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 23:24:22,042 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 23:24:22,042 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 23:24:22,043 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 23:24:22,043 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 23:24:22,043 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 23:24:22,044 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-09-04 23:24:22,044 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 23:24:22,044 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 23:24:22,044 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 23:24:22,044 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 23:24:22,045 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-09-04 23:24:22,045 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 23:24:22,045 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 [2020-09-04 23:24:22,478 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 23:24:22,502 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 23:24:22,506 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 23:24:22,510 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 23:24:22,510 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 23:24:22,511 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invariants/eq1.c [2020-09-04 23:24:22,602 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/15f52017e/e2faba7246d84471962a2453d19a0b25/FLAGbd3ce8715 [2020-09-04 23:24:23,147 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 23:24:23,148 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-invariants/eq1.c [2020-09-04 23:24:23,156 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/15f52017e/e2faba7246d84471962a2453d19a0b25/FLAGbd3ce8715 [2020-09-04 23:24:23,512 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/15f52017e/e2faba7246d84471962a2453d19a0b25 [2020-09-04 23:24:23,525 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 23:24:23,527 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 23:24:23,528 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 23:24:23,528 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 23:24:23,532 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 23:24:23,534 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 11:24:23" (1/1) ... [2020-09-04 23:24:23,537 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@73a7ab7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:24:23, skipping insertion in model container [2020-09-04 23:24:23,537 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 11:24:23" (1/1) ... [2020-09-04 23:24:23,545 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 23:24:23,568 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 23:24:23,779 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 23:24:23,784 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 23:24:23,800 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 23:24:23,815 INFO L208 MainTranslator]: Completed translation [2020-09-04 23:24:23,816 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:24:23 WrapperNode [2020-09-04 23:24:23,816 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 23:24:23,816 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 23:24:23,816 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 23:24:23,817 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 23:24:23,829 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:24:23" (1/1) ... [2020-09-04 23:24:23,830 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:24:23" (1/1) ... [2020-09-04 23:24:23,835 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:24:23" (1/1) ... [2020-09-04 23:24:23,836 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:24:23" (1/1) ... [2020-09-04 23:24:23,913 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:24:23" (1/1) ... [2020-09-04 23:24:23,918 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:24:23" (1/1) ... [2020-09-04 23:24:23,919 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:24:23" (1/1) ... [2020-09-04 23:24:23,920 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 23:24:23,921 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 23:24:23,921 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 23:24:23,921 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 23:24:23,922 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:24:23" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 23:24:24,000 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 23:24:24,000 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 23:24:24,000 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-04 23:24:24,000 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 23:24:24,000 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 23:24:24,000 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-09-04 23:24:24,001 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-04 23:24:24,001 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 23:24:24,001 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 23:24:24,001 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 23:24:24,254 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 23:24:24,254 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-09-04 23:24:24,263 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 11:24:24 BoogieIcfgContainer [2020-09-04 23:24:24,263 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 23:24:24,278 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 23:24:24,279 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 23:24:24,284 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 23:24:24,284 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 11:24:23" (1/3) ... [2020-09-04 23:24:24,285 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1816c3eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 11:24:24, skipping insertion in model container [2020-09-04 23:24:24,285 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:24:23" (2/3) ... [2020-09-04 23:24:24,286 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1816c3eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 11:24:24, skipping insertion in model container [2020-09-04 23:24:24,286 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 11:24:24" (3/3) ... [2020-09-04 23:24:24,294 INFO L109 eAbstractionObserver]: Analyzing ICFG eq1.c [2020-09-04 23:24:24,318 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-04 23:24:24,327 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 23:24:24,345 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 23:24:24,371 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 23:24:24,371 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 23:24:24,372 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-04 23:24:24,372 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 23:24:24,372 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 23:24:24,372 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 23:24:24,373 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 23:24:24,373 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 23:24:24,389 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states. [2020-09-04 23:24:24,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-09-04 23:24:24,400 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:24:24,402 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:24:24,402 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:24:24,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:24:24,409 INFO L82 PathProgramCache]: Analyzing trace with hash 635191250, now seen corresponding path program 1 times [2020-09-04 23:24:24,419 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:24:24,419 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [878190475] [2020-09-04 23:24:24,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:24:24,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:24,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:24:24,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:24,543 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:24:24,543 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [878190475] [2020-09-04 23:24:24,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 23:24:24,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-09-04 23:24:24,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360749401] [2020-09-04 23:24:24,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-09-04 23:24:24,553 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:24:24,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-09-04 23:24:24,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-09-04 23:24:24,569 INFO L87 Difference]: Start difference. First operand 40 states. Second operand 2 states. [2020-09-04 23:24:24,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:24:24,601 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2020-09-04 23:24:24,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-09-04 23:24:24,602 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2020-09-04 23:24:24,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:24:24,613 INFO L225 Difference]: With dead ends: 52 [2020-09-04 23:24:24,613 INFO L226 Difference]: Without dead ends: 33 [2020-09-04 23:24:24,617 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 [2020-09-04 23:24:24,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-09-04 23:24:24,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-09-04 23:24:24,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-09-04 23:24:24,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-09-04 23:24:24,664 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 15 [2020-09-04 23:24:24,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:24:24,664 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-09-04 23:24:24,665 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-09-04 23:24:24,665 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-09-04 23:24:24,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-09-04 23:24:24,666 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:24:24,666 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:24:24,666 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 23:24:24,667 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:24:24,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:24:24,667 INFO L82 PathProgramCache]: Analyzing trace with hash 1725587167, now seen corresponding path program 1 times [2020-09-04 23:24:24,667 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:24:24,668 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1610805234] [2020-09-04 23:24:24,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:24:24,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:24,938 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:24:24,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:24,946 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:24:24,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1610805234] [2020-09-04 23:24:24,950 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 23:24:24,950 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-09-04 23:24:24,951 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041001573] [2020-09-04 23:24:24,956 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-04 23:24:24,956 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:24:24,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-04 23:24:24,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-09-04 23:24:24,957 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 6 states. [2020-09-04 23:24:25,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:24:25,076 INFO L93 Difference]: Finished difference Result 63 states and 67 transitions. [2020-09-04 23:24:25,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-04 23:24:25,077 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-09-04 23:24:25,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:24:25,081 INFO L225 Difference]: With dead ends: 63 [2020-09-04 23:24:25,081 INFO L226 Difference]: Without dead ends: 57 [2020-09-04 23:24:25,082 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-09-04 23:24:25,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-09-04 23:24:25,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 34. [2020-09-04 23:24:25,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-09-04 23:24:25,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2020-09-04 23:24:25,093 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 16 [2020-09-04 23:24:25,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:24:25,094 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2020-09-04 23:24:25,094 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-04 23:24:25,094 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2020-09-04 23:24:25,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-09-04 23:24:25,095 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:24:25,096 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:24:25,096 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-04 23:24:25,096 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:24:25,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:24:25,097 INFO L82 PathProgramCache]: Analyzing trace with hash -82059580, now seen corresponding path program 1 times [2020-09-04 23:24:25,097 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:24:25,098 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2068063466] [2020-09-04 23:24:25,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:24:25,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:25,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:24:25,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:25,412 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:24:25,412 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2068063466] [2020-09-04 23:24:25,412 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:24:25,413 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-04 23:24:25,413 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [200184168] [2020-09-04 23:24:25,413 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-04 23:24:25,414 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:24:25,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-04 23:24:25,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-09-04 23:24:25,415 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 8 states. [2020-09-04 23:24:25,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:24:25,502 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2020-09-04 23:24:25,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-04 23:24:25,503 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-09-04 23:24:25,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:24:25,505 INFO L225 Difference]: With dead ends: 53 [2020-09-04 23:24:25,505 INFO L226 Difference]: Without dead ends: 47 [2020-09-04 23:24:25,506 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-09-04 23:24:25,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-09-04 23:24:25,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 43. [2020-09-04 23:24:25,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-09-04 23:24:25,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2020-09-04 23:24:25,518 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 26 [2020-09-04 23:24:25,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:24:25,520 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2020-09-04 23:24:25,520 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-04 23:24:25,520 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2020-09-04 23:24:25,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-09-04 23:24:25,521 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:24:25,521 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:24:25,522 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-04 23:24:25,522 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:24:25,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:24:25,522 INFO L82 PathProgramCache]: Analyzing trace with hash -697570748, now seen corresponding path program 1 times [2020-09-04 23:24:25,523 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:24:25,523 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1137296609] [2020-09-04 23:24:25,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:24:25,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:25,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:24:25,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:25,843 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:24:25,844 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1137296609] [2020-09-04 23:24:25,844 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:24:25,844 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-04 23:24:25,845 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1298546621] [2020-09-04 23:24:25,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-04 23:24:25,846 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:24:25,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-04 23:24:25,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-09-04 23:24:25,846 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand 8 states. [2020-09-04 23:24:25,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:24:25,943 INFO L93 Difference]: Finished difference Result 83 states and 89 transitions. [2020-09-04 23:24:25,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-04 23:24:25,944 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-09-04 23:24:25,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:24:25,945 INFO L225 Difference]: With dead ends: 83 [2020-09-04 23:24:25,945 INFO L226 Difference]: Without dead ends: 77 [2020-09-04 23:24:25,946 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-09-04 23:24:25,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-09-04 23:24:25,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 56. [2020-09-04 23:24:25,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-09-04 23:24:25,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2020-09-04 23:24:25,958 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 26 [2020-09-04 23:24:25,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:24:25,958 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2020-09-04 23:24:25,958 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-04 23:24:25,958 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2020-09-04 23:24:25,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-09-04 23:24:25,960 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:24:25,960 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:24:25,960 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-04 23:24:25,961 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:24:25,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:24:25,961 INFO L82 PathProgramCache]: Analyzing trace with hash 1924042729, now seen corresponding path program 1 times [2020-09-04 23:24:25,961 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:24:25,962 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [592693541] [2020-09-04 23:24:25,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:24:25,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:26,485 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 30 [2020-09-04 23:24:26,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:24:26,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:26,534 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:24:26,534 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [592693541] [2020-09-04 23:24:26,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:24:26,536 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-04 23:24:26,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451553005] [2020-09-04 23:24:26,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-04 23:24:26,538 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:24:26,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-04 23:24:26,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-09-04 23:24:26,540 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand 10 states. [2020-09-04 23:24:26,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:24:26,731 INFO L93 Difference]: Finished difference Result 96 states and 103 transitions. [2020-09-04 23:24:26,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-04 23:24:26,734 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 36 [2020-09-04 23:24:26,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:24:26,736 INFO L225 Difference]: With dead ends: 96 [2020-09-04 23:24:26,736 INFO L226 Difference]: Without dead ends: 90 [2020-09-04 23:24:26,737 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-09-04 23:24:26,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-09-04 23:24:26,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 53. [2020-09-04 23:24:26,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-09-04 23:24:26,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-09-04 23:24:26,756 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 36 [2020-09-04 23:24:26,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:24:26,757 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-09-04 23:24:26,757 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-04 23:24:26,757 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-09-04 23:24:26,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-09-04 23:24:26,761 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:24:26,762 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:24:26,762 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-04 23:24:26,762 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:24:26,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:24:26,764 INFO L82 PathProgramCache]: Analyzing trace with hash -726257687, now seen corresponding path program 2 times [2020-09-04 23:24:26,765 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:24:26,765 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [155648539] [2020-09-04 23:24:26,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:24:26,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:27,212 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 30 [2020-09-04 23:24:27,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:24:27,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:27,245 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:24:27,246 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [155648539] [2020-09-04 23:24:27,246 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:24:27,246 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-04 23:24:27,247 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071130275] [2020-09-04 23:24:27,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-04 23:24:27,247 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:24:27,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-04 23:24:27,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-09-04 23:24:27,248 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 10 states. [2020-09-04 23:24:27,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:24:27,353 INFO L93 Difference]: Finished difference Result 53 states and 56 transitions. [2020-09-04 23:24:27,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-04 23:24:27,354 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 36 [2020-09-04 23:24:27,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:24:27,354 INFO L225 Difference]: With dead ends: 53 [2020-09-04 23:24:27,354 INFO L226 Difference]: Without dead ends: 0 [2020-09-04 23:24:27,355 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-09-04 23:24:27,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-09-04 23:24:27,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-09-04 23:24:27,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-09-04 23:24:27,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-09-04 23:24:27,356 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 36 [2020-09-04 23:24:27,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:24:27,357 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-09-04 23:24:27,357 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-04 23:24:27,357 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-09-04 23:24:27,357 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-09-04 23:24:27,358 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-04 23:24:27,360 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-09-04 23:24:27,642 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-09-04 23:24:27,643 INFO L271 CegarLoopResult]: At program point ULTIMATE.initEXIT(line -1) the Hoare annotation is: true [2020-09-04 23:24:27,643 INFO L271 CegarLoopResult]: At program point ULTIMATE.startEXIT(line -1) the Hoare annotation is: true [2020-09-04 23:24:27,643 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-09-04 23:24:27,644 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-09-04 23:24:27,644 INFO L271 CegarLoopResult]: At program point ULTIMATE.startFINAL(line -1) the Hoare annotation is: true [2020-09-04 23:24:27,644 INFO L271 CegarLoopResult]: At program point mainEXIT(lines 9 23) the Hoare annotation is: true [2020-09-04 23:24:27,644 INFO L271 CegarLoopResult]: At program point L21(line 21) the Hoare annotation is: true [2020-09-04 23:24:27,644 INFO L264 CegarLoopResult]: At program point L15(lines 15 19) the Hoare annotation is: (and (= main_~x~0 main_~w~0) (= main_~z~0 main_~y~0)) [2020-09-04 23:24:27,645 INFO L264 CegarLoopResult]: At program point L15-1(line 15) the Hoare annotation is: (and (= main_~x~0 main_~w~0) (= main_~z~0 main_~y~0)) [2020-09-04 23:24:27,645 INFO L264 CegarLoopResult]: At program point L13(line 13) the Hoare annotation is: (= main_~w~0 main_~x~0) [2020-09-04 23:24:27,645 INFO L271 CegarLoopResult]: At program point mainFINAL(lines 9 23) the Hoare annotation is: true [2020-09-04 23:24:27,645 INFO L264 CegarLoopResult]: At program point L15-3(line 15) the Hoare annotation is: (and (= main_~x~0 main_~w~0) (= main_~z~0 main_~y~0)) [2020-09-04 23:24:27,645 INFO L271 CegarLoopResult]: At program point L11(line 11) the Hoare annotation is: true [2020-09-04 23:24:27,646 INFO L264 CegarLoopResult]: At program point L15-4(lines 14 20) the Hoare annotation is: (and (= main_~x~0 main_~w~0) (= main_~z~0 main_~y~0)) [2020-09-04 23:24:27,646 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 9 23) the Hoare annotation is: true [2020-09-04 23:24:27,646 INFO L264 CegarLoopResult]: At program point L18(line 18) the Hoare annotation is: (and (= main_~x~0 main_~w~0) (= main_~z~0 main_~y~0)) [2020-09-04 23:24:27,646 INFO L264 CegarLoopResult]: At program point L18-1(line 18) the Hoare annotation is: (and (= main_~x~0 main_~w~0) (= main_~z~0 main_~y~0)) [2020-09-04 23:24:27,646 INFO L264 CegarLoopResult]: At program point L16(line 16) the Hoare annotation is: (and (= main_~x~0 main_~w~0) (= main_~z~0 main_~y~0)) [2020-09-04 23:24:27,647 INFO L264 CegarLoopResult]: At program point L18-2(line 18) the Hoare annotation is: (let ((.cse0 (+ main_~y~0 1))) (and (= main_~x~0 main_~w~0) (<= .cse0 main_~z~0) (<= main_~z~0 .cse0))) [2020-09-04 23:24:27,647 INFO L264 CegarLoopResult]: At program point L16-1(line 16) the Hoare annotation is: (and (= main_~x~0 main_~w~0) (= main_~z~0 main_~y~0)) [2020-09-04 23:24:27,647 INFO L264 CegarLoopResult]: At program point L18-3(line 18) the Hoare annotation is: (let ((.cse0 (+ main_~y~0 1))) (and (= main_~x~0 main_~w~0) (<= .cse0 main_~z~0) (<= main_~z~0 .cse0))) [2020-09-04 23:24:27,647 INFO L264 CegarLoopResult]: At program point L16-2(line 16) the Hoare annotation is: (let ((.cse0 (+ main_~x~0 1))) (and (<= main_~w~0 .cse0) (<= .cse0 main_~w~0) (= main_~z~0 main_~y~0))) [2020-09-04 23:24:27,647 INFO L264 CegarLoopResult]: At program point L18-4(line 18) the Hoare annotation is: (let ((.cse0 (+ main_~y~0 1))) (and (= main_~x~0 main_~w~0) (<= .cse0 main_~z~0) (<= main_~z~0 .cse0))) [2020-09-04 23:24:27,648 INFO L264 CegarLoopResult]: At program point L14-1(line 14) the Hoare annotation is: (let ((.cse3 (div main_~z~0 4294967296)) (.cse2 (div main_~y~0 4294967296))) (let ((.cse1 (+ main_~z~0 (* 4294967296 .cse2))) (.cse0 (* 4294967296 .cse3))) (and (<= (+ main_~y~0 .cse0) .cse1) (< .cse1 (+ main_~y~0 .cse0 1)) (= main_~x~0 main_~w~0) (< .cse2 (+ .cse3 1))))) [2020-09-04 23:24:27,648 INFO L264 CegarLoopResult]: At program point L16-3(line 16) the Hoare annotation is: (let ((.cse0 (+ main_~x~0 1))) (and (<= main_~w~0 .cse0) (<= .cse0 main_~w~0) (= main_~z~0 main_~y~0))) [2020-09-04 23:24:27,648 INFO L264 CegarLoopResult]: At program point L18-5(line 18) the Hoare annotation is: (and (= main_~w~0 main_~x~0) (= main_~y~0 main_~z~0)) [2020-09-04 23:24:27,648 INFO L264 CegarLoopResult]: At program point L12(line 12) the Hoare annotation is: (= main_~w~0 main_~x~0) [2020-09-04 23:24:27,649 INFO L264 CegarLoopResult]: At program point L16-4(line 16) the Hoare annotation is: (let ((.cse0 (+ main_~x~0 1))) (and (<= main_~w~0 .cse0) (<= .cse0 main_~w~0) (= main_~z~0 main_~y~0))) [2020-09-04 23:24:27,649 INFO L264 CegarLoopResult]: At program point L12-1(line 12) the Hoare annotation is: (= main_~w~0 main_~x~0) [2020-09-04 23:24:27,649 INFO L264 CegarLoopResult]: At program point L14-3(line 14) the Hoare annotation is: (and (= main_~x~0 main_~w~0) (= main_~z~0 main_~y~0)) [2020-09-04 23:24:27,649 INFO L264 CegarLoopResult]: At program point L16-5(line 16) the Hoare annotation is: (and (= main_~x~0 main_~w~0) (= main_~z~0 main_~y~0)) [2020-09-04 23:24:27,649 INFO L271 CegarLoopResult]: At program point L10(line 10) the Hoare annotation is: true [2020-09-04 23:24:27,650 INFO L264 CegarLoopResult]: At program point L14-4(lines 14 20) the Hoare annotation is: (let ((.cse3 (div main_~z~0 4294967296)) (.cse2 (div main_~y~0 4294967296))) (let ((.cse1 (+ main_~z~0 (* 4294967296 .cse2))) (.cse0 (* 4294967296 .cse3))) (and (<= (+ main_~y~0 .cse0) .cse1) (< .cse1 (+ main_~y~0 .cse0 1)) (= main_~x~0 main_~w~0) (< .cse2 (+ .cse3 1))))) [2020-09-04 23:24:27,650 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 3 8) the Hoare annotation is: true [2020-09-04 23:24:27,650 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertEXIT(lines 3 8) the Hoare annotation is: true [2020-09-04 23:24:27,650 INFO L264 CegarLoopResult]: At program point L5(line 5) the Hoare annotation is: (= |__VERIFIER_assert_#in~cond| 0) [2020-09-04 23:24:27,650 INFO L264 CegarLoopResult]: At program point L4(lines 4 6) the Hoare annotation is: (or (= |__VERIFIER_assert_#in~cond| 0) (not (= __VERIFIER_assert_~cond 0))) [2020-09-04 23:24:27,651 INFO L264 CegarLoopResult]: At program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 5) the Hoare annotation is: (= |__VERIFIER_assert_#in~cond| 0) [2020-09-04 23:24:27,651 INFO L271 CegarLoopResult]: At program point L4-2(lines 3 8) the Hoare annotation is: true [2020-09-04 23:24:27,675 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.09 11:24:27 BoogieIcfgContainer [2020-09-04 23:24:27,675 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-04 23:24:27,678 INFO L168 Benchmark]: Toolchain (without parser) took 4150.87 ms. Allocated memory was 139.5 MB in the beginning and 245.4 MB in the end (delta: 105.9 MB). Free memory was 102.2 MB in the beginning and 146.2 MB in the end (delta: -44.1 MB). Peak memory consumption was 61.9 MB. Max. memory is 7.1 GB. [2020-09-04 23:24:27,679 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 139.5 MB. Free memory was 120.8 MB in the beginning and 120.4 MB in the end (delta: 419.5 kB). Peak memory consumption was 419.5 kB. Max. memory is 7.1 GB. [2020-09-04 23:24:27,680 INFO L168 Benchmark]: CACSL2BoogieTranslator took 287.99 ms. Allocated memory is still 139.5 MB. Free memory was 101.7 MB in the beginning and 92.4 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-09-04 23:24:27,681 INFO L168 Benchmark]: Boogie Preprocessor took 103.93 ms. Allocated memory was 139.5 MB in the beginning and 202.9 MB in the end (delta: 63.4 MB). Free memory was 92.4 MB in the beginning and 181.7 MB in the end (delta: -89.3 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. [2020-09-04 23:24:27,682 INFO L168 Benchmark]: RCFGBuilder took 342.90 ms. Allocated memory is still 202.9 MB. Free memory was 181.3 MB in the beginning and 168.7 MB in the end (delta: 12.7 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. [2020-09-04 23:24:27,683 INFO L168 Benchmark]: TraceAbstraction took 3397.22 ms. Allocated memory was 202.9 MB in the beginning and 245.4 MB in the end (delta: 42.5 MB). Free memory was 167.7 MB in the beginning and 146.2 MB in the end (delta: 21.5 MB). Peak memory consumption was 64.0 MB. Max. memory is 7.1 GB. [2020-09-04 23:24:27,686 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 139.5 MB. Free memory was 120.8 MB in the beginning and 120.4 MB in the end (delta: 419.5 kB). Peak memory consumption was 419.5 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 287.99 ms. Allocated memory is still 139.5 MB. Free memory was 101.7 MB in the beginning and 92.4 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 103.93 ms. Allocated memory was 139.5 MB in the beginning and 202.9 MB in the end (delta: 63.4 MB). Free memory was 92.4 MB in the beginning and 181.7 MB in the end (delta: -89.3 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 342.90 ms. Allocated memory is still 202.9 MB. Free memory was 181.3 MB in the beginning and 168.7 MB in the end (delta: 12.7 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3397.22 ms. Allocated memory was 202.9 MB in the beginning and 245.4 MB in the end (delta: 42.5 MB). Free memory was 167.7 MB in the beginning and 146.2 MB in the end (delta: 21.5 MB). Peak memory consumption was 64.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 5]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 14]: Loop Invariant Derived loop invariant: x == w && z == y - ProcedureContractResult [Line: 9]: Procedure Contract for main Derived contract for procedure main: 1 - ProcedureContractResult [Line: 3]: Procedure Contract for __VERIFIER_assert Derived contract for procedure __VERIFIER_assert: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 40 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 2.9s, OverallIterations: 6, TraceHistogramMax: 2, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.2s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 172 SDtfs, 180 SDslu, 576 SDs, 0 SdLazy, 294 SolverSat, 20 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 62 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 1.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=56occurred in iteration=4, 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, 6 MinimizatonAttempts, 85 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 40 LocationsWithAnnotation, 70 PreInvPairs, 109 NumberOfFragments, 287 HoareAnnotationTreeSize, 70 FomulaSimplifications, 1378 FormulaSimplificationTreeSizeReduction, 0.1s HoareSimplificationTime, 40 FomulaSimplificationsInter, 35 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.7s InterpolantComputationTime, 155 NumberOfCodeBlocks, 155 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 149 ConstructedInterpolants, 0 QuantifiedInterpolants, 73201 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 6 InterpolantComputations, 2 PerfectInterpolantSequences, 0/12 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 correct! Received shutdown request...