/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 -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 19:46:31,286 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 19:46:31,289 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 19:46:31,314 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 19:46:31,314 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 19:46:31,315 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 19:46:31,317 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 19:46:31,319 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 19:46:31,320 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 19:46:31,321 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 19:46:31,322 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 19:46:31,324 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 19:46:31,324 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 19:46:31,325 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 19:46:31,326 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 19:46:31,328 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 19:46:31,329 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 19:46:31,330 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 19:46:31,331 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 19:46:31,334 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 19:46:31,335 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 19:46:31,337 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 19:46:31,338 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 19:46:31,339 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 19:46:31,341 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 19:46:31,354 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 19:46:31,354 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 19:46:31,355 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 19:46:31,357 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 19:46:31,381 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 19:46:31,381 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 19:46:31,386 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 19:46:31,386 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 19:46:31,386 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 19:46:31,386 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 19:46:31,386 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 19:46:31,390 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 19:46:31,390 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 19:46:31,390 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 19:46:31,391 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 19:46:31,391 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 19:46:31,391 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 19:46:31,391 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 19:46:31,391 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 19:46:31,392 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-08-22 19:46:31,392 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 19:46:31,392 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 19:46:31,392 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 19:46:31,393 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 19:46:31,394 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-08-22 19:46:31,394 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 19:46:31,394 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-08-22 19:46:31,741 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 19:46:31,758 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 19:46:31,765 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 19:46:31,767 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 19:46:31,768 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 19:46:31,768 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2020-08-22 19:46:31,849 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7314711f6/9c80cf7da3934129bf99a42fdcdbf7d7/FLAG78bd9b882 [2020-08-22 19:46:32,383 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 19:46:32,384 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2020-08-22 19:46:32,393 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7314711f6/9c80cf7da3934129bf99a42fdcdbf7d7/FLAG78bd9b882 [2020-08-22 19:46:32,717 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7314711f6/9c80cf7da3934129bf99a42fdcdbf7d7 [2020-08-22 19:46:32,729 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 19:46:32,731 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 19:46:32,732 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 19:46:32,732 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 19:46:32,736 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 19:46:32,737 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 07:46:32" (1/1) ... [2020-08-22 19:46:32,740 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5aa6d630 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:46:32, skipping insertion in model container [2020-08-22 19:46:32,740 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 07:46:32" (1/1) ... [2020-08-22 19:46:32,748 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 19:46:32,769 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 19:46:32,947 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 19:46:32,951 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 19:46:32,966 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 19:46:32,980 INFO L208 MainTranslator]: Completed translation [2020-08-22 19:46:32,981 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:46:32 WrapperNode [2020-08-22 19:46:32,981 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 19:46:32,982 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 19:46:32,982 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 19:46:32,982 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 19:46:32,995 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:46:32" (1/1) ... [2020-08-22 19:46:32,995 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:46:32" (1/1) ... [2020-08-22 19:46:33,081 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:46:32" (1/1) ... [2020-08-22 19:46:33,081 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:46:32" (1/1) ... [2020-08-22 19:46:33,085 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:46:32" (1/1) ... [2020-08-22 19:46:33,090 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:46:32" (1/1) ... [2020-08-22 19:46:33,091 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:46:32" (1/1) ... [2020-08-22 19:46:33,092 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 19:46:33,092 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 19:46:33,093 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 19:46:33,093 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 19:46:33,095 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:46:32" (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 19:46:33,158 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 19:46:33,159 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 19:46:33,159 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 19:46:33,159 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 19:46:33,159 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 19:46:33,159 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 19:46:33,160 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 19:46:33,160 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 19:46:33,160 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 19:46:33,322 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 19:46:33,322 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-22 19:46:33,326 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 07:46:33 BoogieIcfgContainer [2020-08-22 19:46:33,326 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 19:46:33,327 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 19:46:33,327 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 19:46:33,331 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 19:46:33,331 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 07:46:32" (1/3) ... [2020-08-22 19:46:33,332 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75df01e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 07:46:33, skipping insertion in model container [2020-08-22 19:46:33,332 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:46:32" (2/3) ... [2020-08-22 19:46:33,333 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75df01e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 07:46:33, skipping insertion in model container [2020-08-22 19:46:33,333 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 07:46:33" (3/3) ... [2020-08-22 19:46:33,335 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_2-1.c [2020-08-22 19:46:33,347 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 19:46:33,354 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 19:46:33,376 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 19:46:33,440 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 19:46:33,440 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 19:46:33,443 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-08-22 19:46:33,443 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 19:46:33,443 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 19:46:33,444 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 19:46:33,444 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 19:46:33,444 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 19:46:33,476 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-22 19:46:33,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-22 19:46:33,502 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 19:46:33,503 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 19:46:33,504 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 19:46:33,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 19:46:33,519 INFO L82 PathProgramCache]: Analyzing trace with hash 493765703, now seen corresponding path program 1 times [2020-08-22 19:46:33,528 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 19:46:33,528 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [242297943] [2020-08-22 19:46:33,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 19:46:33,583 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 19:46:33,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:33,645 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 19:46:33,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:33,653 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 19:46:33,658 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [242297943] [2020-08-22 19:46:33,660 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 19:46:33,661 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-22 19:46:33,661 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520556014] [2020-08-22 19:46:33,667 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-22 19:46:33,667 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 19:46:33,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-22 19:46:33,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-22 19:46:33,686 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-22 19:46:33,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 19:46:33,714 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2020-08-22 19:46:33,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-22 19:46:33,716 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2020-08-22 19:46:33,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 19:46:33,725 INFO L225 Difference]: With dead ends: 33 [2020-08-22 19:46:33,725 INFO L226 Difference]: Without dead ends: 16 [2020-08-22 19:46:33,730 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 19:46:33,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-22 19:46:33,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-22 19:46:33,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-22 19:46:33,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-22 19:46:33,775 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 11 [2020-08-22 19:46:33,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 19:46:33,776 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-22 19:46:33,776 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-22 19:46:33,776 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-22 19:46:33,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-22 19:46:33,777 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 19:46:33,777 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 19:46:33,778 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 19:46:33,778 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 19:46:33,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 19:46:33,779 INFO L82 PathProgramCache]: Analyzing trace with hash 486377535, now seen corresponding path program 1 times [2020-08-22 19:46:33,779 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 19:46:33,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1784106051] [2020-08-22 19:46:33,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 19:46:33,782 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 19:46:33,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:33,944 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 19:46:33,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:33,950 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 19:46:33,951 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1784106051] [2020-08-22 19:46:33,951 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 19:46:33,952 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 19:46:33,953 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814200055] [2020-08-22 19:46:33,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 19:46:33,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 19:46:33,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 19:46:33,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 19:46:33,957 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 3 states. [2020-08-22 19:46:34,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 19:46:34,002 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-22 19:46:34,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 19:46:34,004 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2020-08-22 19:46:34,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 19:46:34,005 INFO L225 Difference]: With dead ends: 24 [2020-08-22 19:46:34,005 INFO L226 Difference]: Without dead ends: 19 [2020-08-22 19:46:34,007 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 19:46:34,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-22 19:46:34,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2020-08-22 19:46:34,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-22 19:46:34,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-22 19:46:34,020 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 11 [2020-08-22 19:46:34,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 19:46:34,020 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-22 19:46:34,021 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 19:46:34,021 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-22 19:46:34,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-22 19:46:34,022 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 19:46:34,022 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 19:46:34,022 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 19:46:34,023 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 19:46:34,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 19:46:34,023 INFO L82 PathProgramCache]: Analyzing trace with hash -1748013841, now seen corresponding path program 1 times [2020-08-22 19:46:34,024 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 19:46:34,024 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1697841160] [2020-08-22 19:46:34,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 19:46:34,048 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 19:46:34,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:34,230 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 19:46:34,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:34,236 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 19:46:34,237 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1697841160] [2020-08-22 19:46:34,238 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 19:46:34,238 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-08-22 19:46:34,238 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314156893] [2020-08-22 19:46:34,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 19:46:34,239 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 19:46:34,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 19:46:34,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-22 19:46:34,240 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2020-08-22 19:46:34,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 19:46:34,339 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-22 19:46:34,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 19:46:34,340 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-08-22 19:46:34,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 19:46:34,341 INFO L225 Difference]: With dead ends: 29 [2020-08-22 19:46:34,341 INFO L226 Difference]: Without dead ends: 24 [2020-08-22 19:46:34,342 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-22 19:46:34,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-22 19:46:34,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22. [2020-08-22 19:46:34,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-22 19:46:34,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-22 19:46:34,351 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 16 [2020-08-22 19:46:34,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 19:46:34,352 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-22 19:46:34,352 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 19:46:34,352 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-22 19:46:34,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-22 19:46:34,353 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 19:46:34,353 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 19:46:34,354 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 19:46:34,354 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 19:46:34,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 19:46:34,355 INFO L82 PathProgramCache]: Analyzing trace with hash 1960900159, now seen corresponding path program 2 times [2020-08-22 19:46:34,355 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 19:46:34,355 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [673454628] [2020-08-22 19:46:34,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 19:46:34,367 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 19:46:34,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:34,552 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 19:46:34,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:34,558 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 19:46:34,559 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [673454628] [2020-08-22 19:46:34,559 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 19:46:34,559 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-08-22 19:46:34,560 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715810764] [2020-08-22 19:46:34,560 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 19:46:34,561 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 19:46:34,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 19:46:34,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-08-22 19:46:34,562 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 9 states. [2020-08-22 19:46:34,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 19:46:34,719 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-22 19:46:34,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 19:46:34,720 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 21 [2020-08-22 19:46:34,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 19:46:34,721 INFO L225 Difference]: With dead ends: 34 [2020-08-22 19:46:34,721 INFO L226 Difference]: Without dead ends: 29 [2020-08-22 19:46:34,722 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2020-08-22 19:46:34,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-22 19:46:34,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2020-08-22 19:46:34,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-22 19:46:34,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-22 19:46:34,731 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 21 [2020-08-22 19:46:34,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 19:46:34,731 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-22 19:46:34,731 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 19:46:34,732 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-22 19:46:34,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-22 19:46:34,733 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 19:46:34,733 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 19:46:34,733 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 19:46:34,733 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 19:46:34,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 19:46:34,734 INFO L82 PathProgramCache]: Analyzing trace with hash 1793113839, now seen corresponding path program 3 times [2020-08-22 19:46:34,734 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 19:46:34,735 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [885583607] [2020-08-22 19:46:34,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 19:46:34,740 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 19:46:34,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:34,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 19:46:34,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:34,889 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 19:46:34,890 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [885583607] [2020-08-22 19:46:34,890 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 19:46:34,891 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-08-22 19:46:34,891 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097831783] [2020-08-22 19:46:34,891 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 19:46:34,891 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 19:46:34,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 19:46:34,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2020-08-22 19:46:34,892 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 9 states. [2020-08-22 19:46:35,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 19:46:35,058 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-22 19:46:35,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-22 19:46:35,060 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-22 19:46:35,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 19:46:35,061 INFO L225 Difference]: With dead ends: 39 [2020-08-22 19:46:35,062 INFO L226 Difference]: Without dead ends: 34 [2020-08-22 19:46:35,062 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2020-08-22 19:46:35,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-22 19:46:35,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-08-22 19:46:35,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-22 19:46:35,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-22 19:46:35,079 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 26 [2020-08-22 19:46:35,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 19:46:35,079 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-22 19:46:35,079 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 19:46:35,080 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-22 19:46:35,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-22 19:46:35,082 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 19:46:35,082 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 19:46:35,084 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 19:46:35,084 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 19:46:35,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 19:46:35,084 INFO L82 PathProgramCache]: Analyzing trace with hash -774708161, now seen corresponding path program 4 times [2020-08-22 19:46:35,085 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 19:46:35,085 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1567566423] [2020-08-22 19:46:35,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 19:46:35,090 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 19:46:35,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:35,342 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 19:46:35,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:35,348 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 19:46:35,349 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1567566423] [2020-08-22 19:46:35,349 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 19:46:35,349 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2020-08-22 19:46:35,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869049125] [2020-08-22 19:46:35,350 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 19:46:35,350 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 19:46:35,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 19:46:35,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2020-08-22 19:46:35,351 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 13 states. [2020-08-22 19:46:35,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 19:46:35,631 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-22 19:46:35,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-22 19:46:35,632 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2020-08-22 19:46:35,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 19:46:35,633 INFO L225 Difference]: With dead ends: 44 [2020-08-22 19:46:35,633 INFO L226 Difference]: Without dead ends: 39 [2020-08-22 19:46:35,634 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=67, Invalid=353, Unknown=0, NotChecked=0, Total=420 [2020-08-22 19:46:35,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-22 19:46:35,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2020-08-22 19:46:35,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-22 19:46:35,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-22 19:46:35,646 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 31 [2020-08-22 19:46:35,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 19:46:35,646 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-22 19:46:35,647 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 19:46:35,647 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-22 19:46:35,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-22 19:46:35,648 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 19:46:35,648 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 19:46:35,648 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 19:46:35,649 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 19:46:35,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 19:46:35,649 INFO L82 PathProgramCache]: Analyzing trace with hash -1644982033, now seen corresponding path program 5 times [2020-08-22 19:46:35,650 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 19:46:35,650 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1957269876] [2020-08-22 19:46:35,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 19:46:35,655 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 19:46:35,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:36,017 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 19:46:36,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:36,025 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 19:46:36,025 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1957269876] [2020-08-22 19:46:36,026 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 19:46:36,026 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2020-08-22 19:46:36,026 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135659927] [2020-08-22 19:46:36,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-22 19:46:36,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 19:46:36,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-22 19:46:36,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=178, Unknown=0, NotChecked=0, Total=210 [2020-08-22 19:46:36,029 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 15 states. [2020-08-22 19:46:36,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 19:46:36,370 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-22 19:46:36,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-22 19:46:36,371 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 36 [2020-08-22 19:46:36,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 19:46:36,372 INFO L225 Difference]: With dead ends: 49 [2020-08-22 19:46:36,372 INFO L226 Difference]: Without dead ends: 44 [2020-08-22 19:46:36,373 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=82, Invalid=518, Unknown=0, NotChecked=0, Total=600 [2020-08-22 19:46:36,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-22 19:46:36,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2020-08-22 19:46:36,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-22 19:46:36,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-22 19:46:36,385 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 36 [2020-08-22 19:46:36,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 19:46:36,387 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-22 19:46:36,387 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-22 19:46:36,387 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-22 19:46:36,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-22 19:46:36,391 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 19:46:36,391 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 19:46:36,391 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 19:46:36,392 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 19:46:36,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 19:46:36,392 INFO L82 PathProgramCache]: Analyzing trace with hash 330519103, now seen corresponding path program 6 times [2020-08-22 19:46:36,392 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 19:46:36,393 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [20271056] [2020-08-22 19:46:36,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 19:46:36,399 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 19:46:36,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 19:46:36,422 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 19:46:36,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 19:46:36,447 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 19:46:36,470 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-22 19:46:36,471 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 19:46:36,471 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 19:46:36,493 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 07:46:36 BoogieIcfgContainer [2020-08-22 19:46:36,493 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 19:46:36,497 INFO L168 Benchmark]: Toolchain (without parser) took 3764.67 ms. Allocated memory was 141.6 MB in the beginning and 241.2 MB in the end (delta: 99.6 MB). Free memory was 105.6 MB in the beginning and 136.5 MB in the end (delta: -30.9 MB). Peak memory consumption was 68.7 MB. Max. memory is 7.1 GB. [2020-08-22 19:46:36,503 INFO L168 Benchmark]: CDTParser took 0.89 ms. Allocated memory is still 141.6 MB. Free memory was 124.1 MB in the beginning and 123.9 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-08-22 19:46:36,506 INFO L168 Benchmark]: CACSL2BoogieTranslator took 249.39 ms. Allocated memory is still 141.6 MB. Free memory was 105.2 MB in the beginning and 96.0 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-08-22 19:46:36,507 INFO L168 Benchmark]: Boogie Preprocessor took 110.23 ms. Allocated memory was 141.6 MB in the beginning and 202.4 MB in the end (delta: 60.8 MB). Free memory was 96.0 MB in the beginning and 181.0 MB in the end (delta: -85.0 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. [2020-08-22 19:46:36,508 INFO L168 Benchmark]: RCFGBuilder took 233.93 ms. Allocated memory is still 202.4 MB. Free memory was 181.0 MB in the beginning and 170.0 MB in the end (delta: 11.0 MB). Peak memory consumption was 11.0 MB. Max. memory is 7.1 GB. [2020-08-22 19:46:36,509 INFO L168 Benchmark]: TraceAbstraction took 3166.24 ms. Allocated memory was 202.4 MB in the beginning and 241.2 MB in the end (delta: 38.8 MB). Free memory was 169.4 MB in the beginning and 136.5 MB in the end (delta: 32.9 MB). Peak memory consumption was 71.7 MB. Max. memory is 7.1 GB. [2020-08-22 19:46:36,521 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.89 ms. Allocated memory is still 141.6 MB. Free memory was 124.1 MB in the beginning and 123.9 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 249.39 ms. Allocated memory is still 141.6 MB. Free memory was 105.2 MB in the beginning and 96.0 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 110.23 ms. Allocated memory was 141.6 MB in the beginning and 202.4 MB in the end (delta: 60.8 MB). Free memory was 96.0 MB in the beginning and 181.0 MB in the end (delta: -85.0 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 233.93 ms. Allocated memory is still 202.4 MB. Free memory was 181.0 MB in the beginning and 170.0 MB in the end (delta: 11.0 MB). Peak memory consumption was 11.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3166.24 ms. Allocated memory was 202.4 MB in the beginning and 241.2 MB in the end (delta: 38.8 MB). Free memory was 169.4 MB in the beginning and 136.5 MB in the end (delta: 32.9 MB). Peak memory consumption was 71.7 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; [L12] unsigned int y = 1; [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND FALSE !(x < 6) [L19] CALL __VERIFIER_assert(x != 6) [L4] COND TRUE !(cond) [L5] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 22 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.0s, OverallIterations: 8, TraceHistogramMax: 6, AutomataDifference: 1.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 117 SDtfs, 53 SDslu, 539 SDs, 0 SdLazy, 497 SolverSat, 30 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 106 GetRequests, 28 SyntacticMatches, 4 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 1.2s 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, 12 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, 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...