/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/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --abstractinterpretationv2.abstract.domain IntervalDomain --traceabstraction.trace.refinement.strategy TAIPAN --traceabstraction.abstract.interpretation.mode USE_PREDICATES -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 00:33:11,716 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 00:33:11,720 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 00:33:11,737 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-07 00:33:11,785 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-07 00:33:11,801 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 00:33:11,804 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 00:33:11,805 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 00:33:11,805 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 00:33:11,805 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 00:33:11,805 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 00:33:11,806 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 00:33:11,806 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 00:33:11,806 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 00:33:11,806 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 00:33:11,806 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 00:33:11,807 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 00:33:11,807 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 00:33:11,807 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 00:33:11,807 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 00:33:11,807 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 00:33:11,808 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 00:33:11,808 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 00:33:11,808 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 00:33:11,808 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 00:33:11,808 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 00:33:11,808 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 00:33:11,809 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 00:33:11,809 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 00:33:11,809 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 00:33:11,809 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 00:33:11,809 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 00:33:11,810 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 00:33:11,810 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: Abstract domain -> IntervalDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Abstract interpretation Mode -> USE_PREDICATES [2019-11-07 00:33:12,088 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 00:33:12,101 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 00:33:12,105 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 00:33:12,106 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 00:33:12,106 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 00:33:12,107 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2019-11-07 00:33:12,183 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6f7b56293/492b136160c04e1cbcc465f8212fef14/FLAG062975881 [2019-11-07 00:33:12,635 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 00:33:12,636 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2019-11-07 00:33:12,642 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6f7b56293/492b136160c04e1cbcc465f8212fef14/FLAG062975881 [2019-11-07 00:33:12,991 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6f7b56293/492b136160c04e1cbcc465f8212fef14 [2019-11-07 00:33:12,999 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 00:33:13,001 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 00:33:13,002 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 00:33:13,002 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 00:33:13,006 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 00:33:13,007 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:33:12" (1/1) ... [2019-11-07 00:33:13,010 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@74161aa0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:33:13, skipping insertion in model container [2019-11-07 00:33:13,010 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:33:12" (1/1) ... [2019-11-07 00:33:13,018 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 00:33:13,035 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 00:33:13,191 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 00:33:13,195 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 00:33:13,209 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 00:33:13,221 INFO L192 MainTranslator]: Completed translation [2019-11-07 00:33:13,221 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:33:13 WrapperNode [2019-11-07 00:33:13,222 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 00:33:13,222 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 00:33:13,222 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 00:33:13,223 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 00:33:13,232 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:33:13" (1/1) ... [2019-11-07 00:33:13,233 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:33:13" (1/1) ... [2019-11-07 00:33:13,311 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:33:13" (1/1) ... [2019-11-07 00:33:13,311 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:33:13" (1/1) ... [2019-11-07 00:33:13,315 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:33:13" (1/1) ... [2019-11-07 00:33:13,322 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:33:13" (1/1) ... [2019-11-07 00:33:13,323 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:33:13" (1/1) ... [2019-11-07 00:33:13,324 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 00:33:13,325 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 00:33:13,325 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 00:33:13,325 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 00:33:13,326 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:33:13" (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 [2019-11-07 00:33:13,377 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 00:33:13,378 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 00:33:13,378 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 00:33:13,378 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 00:33:13,378 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 00:33:13,378 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 00:33:13,379 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 00:33:13,379 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 00:33:13,379 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 00:33:13,549 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 00:33:13,549 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-07 00:33:13,550 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:33:13 BoogieIcfgContainer [2019-11-07 00:33:13,550 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 00:33:13,551 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 00:33:13,552 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 00:33:13,555 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 00:33:13,555 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 12:33:12" (1/3) ... [2019-11-07 00:33:13,556 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2180d67f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:33:13, skipping insertion in model container [2019-11-07 00:33:13,556 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:33:13" (2/3) ... [2019-11-07 00:33:13,557 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2180d67f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:33:13, skipping insertion in model container [2019-11-07 00:33:13,557 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:33:13" (3/3) ... [2019-11-07 00:33:13,558 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_1-1.c [2019-11-07 00:33:13,566 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 00:33:13,574 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 00:33:13,585 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 00:33:13,611 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 00:33:13,611 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 00:33:13,611 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 00:33:13,611 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 00:33:13,611 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 00:33:13,612 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 00:33:13,612 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 00:33:13,612 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 00:33:13,628 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2019-11-07 00:33:13,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-07 00:33:13,632 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:33:13,633 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:33:13,635 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:33:13,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:33:13,641 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2019-11-07 00:33:13,648 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:33:13,648 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [18134898] [2019-11-07 00:33:13,649 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:33:13,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:33:13,821 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 00:33:13,822 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [18134898] [2019-11-07 00:33:13,823 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 00:33:13,823 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 00:33:13,825 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757339133] [2019-11-07 00:33:13,830 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 00:33:13,832 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:33:13,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 00:33:13,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 00:33:13,855 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2019-11-07 00:33:13,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:33:13,899 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2019-11-07 00:33:13,900 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 00:33:13,901 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2019-11-07 00:33:13,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:33:13,910 INFO L225 Difference]: With dead ends: 29 [2019-11-07 00:33:13,910 INFO L226 Difference]: Without dead ends: 12 [2019-11-07 00:33:13,914 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 00:33:13,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-11-07 00:33:13,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2019-11-07 00:33:13,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2019-11-07 00:33:13,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2019-11-07 00:33:13,987 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2019-11-07 00:33:13,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:33:13,988 INFO L462 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2019-11-07 00:33:13,988 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 00:33:13,988 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2019-11-07 00:33:13,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-11-07 00:33:13,990 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:33:13,990 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:33:13,991 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:33:13,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:33:13,991 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2019-11-07 00:33:13,992 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:33:13,992 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1132722538] [2019-11-07 00:33:13,993 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:33:14,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:33:14,158 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 00:33:14,158 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1132722538] [2019-11-07 00:33:14,159 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [87653648] [2019-11-07 00:33:14,159 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:33:14,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:33:14,220 INFO L256 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-07 00:33:14,228 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 00:33:14,281 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 00:33:14,282 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 00:33:14,322 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 00:33:14,323 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [2026493773] [2019-11-07 00:33:14,329 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 12 [2019-11-07 00:33:14,366 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-11-07 00:33:14,367 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-11-07 00:33:14,425 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2019-11-07 00:33:14,500 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-11-07 00:33:14,503 INFO L272 AbstractInterpreter]: Visited 11 different actions 47 times. Merged at 2 different actions 12 times. Widened at 1 different actions 4 times. Performed 89 root evaluator evaluations with a maximum evaluation depth of 6. Performed 89 inverse root evaluator evaluations with a maximum inverse evaluation depth of 6. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2019-11-07 00:33:14,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:33:14,509 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 00:33:14,510 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 00:33:14,510 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2019-11-07 00:33:14,511 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034400555] [2019-11-07 00:33:14,512 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-07 00:33:14,512 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:33:14,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-07 00:33:14,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2019-11-07 00:33:14,513 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 7 states. [2019-11-07 00:33:14,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:33:14,569 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2019-11-07 00:33:14,571 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-07 00:33:14,571 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 11 [2019-11-07 00:33:14,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:33:14,572 INFO L225 Difference]: With dead ends: 20 [2019-11-07 00:33:14,573 INFO L226 Difference]: Without dead ends: 15 [2019-11-07 00:33:14,574 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=30, Unknown=0, NotChecked=0, Total=56 [2019-11-07 00:33:14,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-11-07 00:33:14,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-11-07 00:33:14,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-11-07 00:33:14,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2019-11-07 00:33:14,581 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 11 [2019-11-07 00:33:14,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:33:14,582 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2019-11-07 00:33:14,582 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-07 00:33:14,582 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2019-11-07 00:33:14,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-07 00:33:14,583 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:33:14,583 INFO L410 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:33:14,788 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:33:14,789 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:33:14,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:33:14,790 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 2 times [2019-11-07 00:33:14,790 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:33:14,791 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [216280486] [2019-11-07 00:33:14,791 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:33:14,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:33:14,957 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 00:33:14,959 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [216280486] [2019-11-07 00:33:14,959 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [638088075] [2019-11-07 00:33:14,960 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:33:15,012 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 00:33:15,013 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 00:33:15,014 INFO L256 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-07 00:33:15,016 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 00:33:15,049 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 00:33:15,050 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 00:33:15,158 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 00:33:15,159 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [754513629] [2019-11-07 00:33:15,159 INFO L195 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-11-07 00:33:15,160 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-11-07 00:33:15,160 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 00:33:15,160 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2019-11-07 00:33:15,160 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313713255] [2019-11-07 00:33:15,161 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-07 00:33:15,161 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:33:15,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-07 00:33:15,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2019-11-07 00:33:15,163 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 13 states. [2019-11-07 00:33:15,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:33:15,227 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2019-11-07 00:33:15,229 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-07 00:33:15,230 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 14 [2019-11-07 00:33:15,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:33:15,231 INFO L225 Difference]: With dead ends: 22 [2019-11-07 00:33:15,231 INFO L226 Difference]: Without dead ends: 17 [2019-11-07 00:33:15,231 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2019-11-07 00:33:15,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-11-07 00:33:15,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-11-07 00:33:15,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-11-07 00:33:15,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2019-11-07 00:33:15,237 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2019-11-07 00:33:15,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:33:15,237 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2019-11-07 00:33:15,238 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-07 00:33:15,238 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2019-11-07 00:33:15,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-07 00:33:15,238 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:33:15,239 INFO L410 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:33:15,453 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:33:15,454 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:33:15,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:33:15,455 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 3 times [2019-11-07 00:33:15,455 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:33:15,456 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1356175335] [2019-11-07 00:33:15,456 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:33:15,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-07 00:33:15,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-07 00:33:15,545 INFO L172 FreeRefinementEngine]: Strategy TAIPAN found a feasible trace [2019-11-07 00:33:15,545 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-11-07 00:33:15,568 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 12:33:15 BoogieIcfgContainer [2019-11-07 00:33:15,568 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-07 00:33:15,571 INFO L168 Benchmark]: Toolchain (without parser) took 2568.73 ms. Allocated memory was 135.8 MB in the beginning and 227.5 MB in the end (delta: 91.8 MB). Free memory was 99.8 MB in the beginning and 192.0 MB in the end (delta: -92.2 MB). There was no memory consumed. Max. memory is 7.1 GB. [2019-11-07 00:33:15,571 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 135.8 MB. Free memory was 117.7 MB in the beginning and 117.5 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2019-11-07 00:33:15,572 INFO L168 Benchmark]: CACSL2BoogieTranslator took 219.98 ms. Allocated memory is still 135.8 MB. Free memory was 99.4 MB in the beginning and 90.4 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. [2019-11-07 00:33:15,573 INFO L168 Benchmark]: Boogie Preprocessor took 102.21 ms. Allocated memory was 135.8 MB in the beginning and 198.7 MB in the end (delta: 62.9 MB). Free memory was 90.4 MB in the beginning and 178.1 MB in the end (delta: -87.7 MB). Peak memory consumption was 14.2 MB. Max. memory is 7.1 GB. [2019-11-07 00:33:15,574 INFO L168 Benchmark]: RCFGBuilder took 225.60 ms. Allocated memory is still 198.7 MB. Free memory was 178.1 MB in the beginning and 166.5 MB in the end (delta: 11.6 MB). Peak memory consumption was 11.6 MB. Max. memory is 7.1 GB. [2019-11-07 00:33:15,576 INFO L168 Benchmark]: TraceAbstraction took 2016.50 ms. Allocated memory was 198.7 MB in the beginning and 227.5 MB in the end (delta: 28.8 MB). Free memory was 166.5 MB in the beginning and 192.0 MB in the end (delta: -25.5 MB). Peak memory consumption was 3.4 MB. Max. memory is 7.1 GB. [2019-11-07 00:33:15,580 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 135.8 MB. Free memory was 117.7 MB in the beginning and 117.5 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 219.98 ms. Allocated memory is still 135.8 MB. Free memory was 99.4 MB in the beginning and 90.4 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 102.21 ms. Allocated memory was 135.8 MB in the beginning and 198.7 MB in the end (delta: 62.9 MB). Free memory was 90.4 MB in the beginning and 178.1 MB in the end (delta: -87.7 MB). Peak memory consumption was 14.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 225.60 ms. Allocated memory is still 198.7 MB. Free memory was 178.1 MB in the beginning and 166.5 MB in the end (delta: 11.6 MB). Peak memory consumption was 11.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2016.50 ms. Allocated memory was 198.7 MB in the beginning and 227.5 MB in the end (delta: 28.8 MB). Free memory was 166.5 MB in the beginning and 192.0 MB in the end (delta: -25.5 MB). Peak memory consumption was 3.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L11] unsigned int x = 0; [L12] unsigned int y = 1; VAL [x=0, y=1] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=1, y=2] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=2, y=4] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=3, y=8] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=4, y=16] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=5, y=32] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=6, y=64] [L14] COND FALSE !(x < 6) VAL [x=6, y=64] [L19] CALL __VERIFIER_assert(y != 64) VAL [\old(cond)=0] [L4] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L5] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 17 locations, 1 error locations. Result: UNSAFE, OverallTime: 1.9s, OverallIterations: 4, TraceHistogramMax: 6, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 36 SDtfs, 0 SDslu, 78 SDs, 0 SdLazy, 50 SolverSat, 13 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 63 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=17occurred in iteration=0, 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, 3 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.6s InterpolantComputationTime, 76 NumberOfCodeBlocks, 76 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 78 ConstructedInterpolants, 0 QuantifiedInterpolants, 2518 SizeOfPredicates, 2 NumberOfNonLiveVariables, 73 ConjunctsInSsa, 16 ConjunctsInUnsatCore, 7 InterpolantComputations, 1 PerfectInterpolantSequences, 0/33 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...