/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/loop-acceleration/underapprox_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-dcfa08f [2020-12-23 06:52:20,829 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-23 06:52:20,833 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-23 06:52:20,891 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-12-23 06:52:20,995 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-23 06:52:21,025 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-23 06:52:21,025 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-23 06:52:21,027 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-23 06:52:21,027 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-23 06:52:21,027 INFO L138 SettingsManager]: * Use SBE=true [2020-12-23 06:52:21,028 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-23 06:52:21,028 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-23 06:52:21,028 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-23 06:52:21,028 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-23 06:52:21,028 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-23 06:52:21,029 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-23 06:52:21,029 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-23 06:52:21,029 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-23 06:52:21,029 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-23 06:52:21,030 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-23 06:52:21,030 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-23 06:52:21,030 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-23 06:52:21,030 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-23 06:52:21,030 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-23 06:52:21,031 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-23 06:52:21,031 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-23 06:52:21,031 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-23 06:52:21,031 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-23 06:52:21,031 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-23 06:52:21,032 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-23 06:52:21,032 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-23 06:52:21,401 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-23 06:52:21,428 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-23 06:52:21,431 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-23 06:52:21,433 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-23 06:52:21,433 INFO L275 PluginConnector]: CDTParser initialized [2020-12-23 06:52:21,434 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-acceleration/underapprox_2-1.c [2020-12-23 06:52:21,518 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/570c55e2b/d0838c60cd4d4a158d3e4becb61e646a/FLAG46e77f328 [2020-12-23 06:52:22,103 INFO L306 CDTParser]: Found 1 translation units. [2020-12-23 06:52:22,103 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loop-acceleration/underapprox_2-1.c [2020-12-23 06:52:22,110 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/570c55e2b/d0838c60cd4d4a158d3e4becb61e646a/FLAG46e77f328 [2020-12-23 06:52:22,484 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/570c55e2b/d0838c60cd4d4a158d3e4becb61e646a [2020-12-23 06:52:22,487 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-23 06:52:22,489 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-23 06:52:22,491 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-23 06:52:22,491 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-23 06:52:22,495 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-23 06:52:22,496 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 06:52:22" (1/1) ... [2020-12-23 06:52:22,498 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6a5bd56a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:22, skipping insertion in model container [2020-12-23 06:52:22,498 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 06:52:22" (1/1) ... [2020-12-23 06:52:22,506 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-23 06:52:22,522 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-23 06:52:22,652 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loop-acceleration/underapprox_2-1.c[327,340] [2020-12-23 06:52:22,664 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 06:52:22,674 INFO L203 MainTranslator]: Completed pre-run [2020-12-23 06:52:22,688 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loop-acceleration/underapprox_2-1.c[327,340] [2020-12-23 06:52:22,690 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 06:52:22,706 INFO L208 MainTranslator]: Completed translation [2020-12-23 06:52:22,707 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:22 WrapperNode [2020-12-23 06:52:22,707 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-23 06:52:22,709 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-23 06:52:22,709 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-23 06:52:22,709 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-23 06:52:22,718 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:22" (1/1) ... [2020-12-23 06:52:22,725 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:22" (1/1) ... [2020-12-23 06:52:22,743 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-23 06:52:22,744 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-23 06:52:22,744 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-23 06:52:22,745 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-23 06:52:22,754 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:22" (1/1) ... [2020-12-23 06:52:22,754 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:22" (1/1) ... [2020-12-23 06:52:22,755 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:22" (1/1) ... [2020-12-23 06:52:22,755 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:22" (1/1) ... [2020-12-23 06:52:22,759 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:22" (1/1) ... [2020-12-23 06:52:22,763 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:22" (1/1) ... [2020-12-23 06:52:22,764 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:22" (1/1) ... [2020-12-23 06:52:22,765 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-23 06:52:22,766 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-23 06:52:22,766 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-23 06:52:22,767 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-23 06:52:22,767 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:22" (1/1) ... No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 06:52:22,859 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-23 06:52:22,859 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-23 06:52:22,859 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-23 06:52:22,859 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-23 06:52:23,054 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-23 06:52:23,054 INFO L299 CfgBuilder]: Removed 7 assume(true) statements. [2020-12-23 06:52:23,056 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 06:52:23 BoogieIcfgContainer [2020-12-23 06:52:23,056 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-23 06:52:23,058 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-23 06:52:23,058 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-23 06:52:23,061 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-23 06:52:23,062 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.12 06:52:22" (1/3) ... [2020-12-23 06:52:23,063 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11226063 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 06:52:23, skipping insertion in model container [2020-12-23 06:52:23,063 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:52:22" (2/3) ... [2020-12-23 06:52:23,063 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11226063 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 06:52:23, skipping insertion in model container [2020-12-23 06:52:23,063 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 06:52:23" (3/3) ... [2020-12-23 06:52:23,065 INFO L111 eAbstractionObserver]: Analyzing ICFG underapprox_2-1.c [2020-12-23 06:52:23,072 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-23 06:52:23,077 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-23 06:52:23,101 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-23 06:52:23,147 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-23 06:52:23,148 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-23 06:52:23,148 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-23 06:52:23,148 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-23 06:52:23,148 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-23 06:52:23,149 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-23 06:52:23,149 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-23 06:52:23,149 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-23 06:52:23,202 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states. [2020-12-23 06:52:23,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-12-23 06:52:23,224 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:23,225 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-12-23 06:52:23,228 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:23,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:23,244 INFO L82 PathProgramCache]: Analyzing trace with hash 889633835, now seen corresponding path program 1 times [2020-12-23 06:52:23,260 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:23,260 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141306468] [2020-12-23 06:52:23,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:23,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:23,630 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:23,631 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141306468] [2020-12-23 06:52:23,632 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 06:52:23,633 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-12-23 06:52:23,634 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083482391] [2020-12-23 06:52:23,646 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-23 06:52:23,649 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:23,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-23 06:52:23,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-23 06:52:23,690 INFO L87 Difference]: Start difference. First operand 10 states. Second operand 4 states. [2020-12-23 06:52:23,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:23,756 INFO L93 Difference]: Finished difference Result 18 states and 22 transitions. [2020-12-23 06:52:23,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-23 06:52:23,759 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2020-12-23 06:52:23,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:23,769 INFO L225 Difference]: With dead ends: 18 [2020-12-23 06:52:23,770 INFO L226 Difference]: Without dead ends: 8 [2020-12-23 06:52:23,773 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-23 06:52:23,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2020-12-23 06:52:23,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2020-12-23 06:52:23,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2020-12-23 06:52:23,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2020-12-23 06:52:23,811 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2020-12-23 06:52:23,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:23,811 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2020-12-23 06:52:23,812 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-23 06:52:23,812 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2020-12-23 06:52:23,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-12-23 06:52:23,812 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:23,812 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:23,813 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-23 06:52:23,813 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:23,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:23,814 INFO L82 PathProgramCache]: Analyzing trace with hash 1810510480, now seen corresponding path program 1 times [2020-12-23 06:52:23,814 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:23,815 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [835425861] [2020-12-23 06:52:23,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:23,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:23,909 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:23,910 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [835425861] [2020-12-23 06:52:23,910 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [174075655] [2020-12-23 06:52:23,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 06:52:23,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:23,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-23 06:52:23,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:52:24,029 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:24,030 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:52:24,030 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2020-12-23 06:52:24,031 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181227973] [2020-12-23 06:52:24,032 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-23 06:52:24,032 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:24,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-23 06:52:24,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-12-23 06:52:24,034 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 6 states. [2020-12-23 06:52:24,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:24,055 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2020-12-23 06:52:24,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-23 06:52:24,056 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 7 [2020-12-23 06:52:24,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:24,056 INFO L225 Difference]: With dead ends: 13 [2020-12-23 06:52:24,057 INFO L226 Difference]: Without dead ends: 9 [2020-12-23 06:52:24,058 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-12-23 06:52:24,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2020-12-23 06:52:24,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2020-12-23 06:52:24,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2020-12-23 06:52:24,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2020-12-23 06:52:24,061 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 7 [2020-12-23 06:52:24,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:24,061 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2020-12-23 06:52:24,061 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-23 06:52:24,062 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2020-12-23 06:52:24,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-12-23 06:52:24,062 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:24,062 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:24,275 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-23 06:52:24,276 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:24,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:24,278 INFO L82 PathProgramCache]: Analyzing trace with hash 292915403, now seen corresponding path program 2 times [2020-12-23 06:52:24,278 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:24,279 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1090766807] [2020-12-23 06:52:24,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:24,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:24,428 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:24,429 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1090766807] [2020-12-23 06:52:24,431 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [191874301] [2020-12-23 06:52:24,432 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 06:52:24,476 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 06:52:24,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:52:24,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-23 06:52:24,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:52:24,506 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:24,507 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:52:24,507 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2020-12-23 06:52:24,508 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525174975] [2020-12-23 06:52:24,508 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-23 06:52:24,508 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:24,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-23 06:52:24,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-12-23 06:52:24,510 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 7 states. [2020-12-23 06:52:24,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:24,538 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2020-12-23 06:52:24,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-23 06:52:24,539 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 8 [2020-12-23 06:52:24,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:24,539 INFO L225 Difference]: With dead ends: 14 [2020-12-23 06:52:24,540 INFO L226 Difference]: Without dead ends: 10 [2020-12-23 06:52:24,540 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 3 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-12-23 06:52:24,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2020-12-23 06:52:24,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2020-12-23 06:52:24,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2020-12-23 06:52:24,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2020-12-23 06:52:24,544 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 8 [2020-12-23 06:52:24,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:24,545 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2020-12-23 06:52:24,545 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-23 06:52:24,545 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2020-12-23 06:52:24,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-23 06:52:24,546 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:24,546 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:24,761 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:24,762 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:24,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:24,764 INFO L82 PathProgramCache]: Analyzing trace with hash 492108272, now seen corresponding path program 3 times [2020-12-23 06:52:24,764 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:24,765 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1794640648] [2020-12-23 06:52:24,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:24,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:24,899 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:24,900 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1794640648] [2020-12-23 06:52:24,900 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1703471897] [2020-12-23 06:52:24,900 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:24,948 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-23 06:52:24,948 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:52:24,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 15 conjunts are in the unsatisfiable core [2020-12-23 06:52:24,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:52:24,980 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:24,981 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:52:24,981 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2020-12-23 06:52:24,981 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475502716] [2020-12-23 06:52:24,982 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-23 06:52:24,982 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:24,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-23 06:52:24,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-12-23 06:52:24,983 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 8 states. [2020-12-23 06:52:25,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:25,016 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2020-12-23 06:52:25,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-23 06:52:25,017 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 9 [2020-12-23 06:52:25,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:25,018 INFO L225 Difference]: With dead ends: 15 [2020-12-23 06:52:25,018 INFO L226 Difference]: Without dead ends: 11 [2020-12-23 06:52:25,019 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 7 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-12-23 06:52:25,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2020-12-23 06:52:25,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2020-12-23 06:52:25,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-12-23 06:52:25,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2020-12-23 06:52:25,023 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 9 [2020-12-23 06:52:25,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:25,023 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2020-12-23 06:52:25,023 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-23 06:52:25,023 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2020-12-23 06:52:25,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-23 06:52:25,024 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:25,024 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:25,237 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:25,238 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:25,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:25,240 INFO L82 PathProgramCache]: Analyzing trace with hash -1922847381, now seen corresponding path program 4 times [2020-12-23 06:52:25,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:25,241 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1890300065] [2020-12-23 06:52:25,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:25,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:25,386 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:25,387 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1890300065] [2020-12-23 06:52:25,388 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1363677836] [2020-12-23 06:52:25,388 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:25,428 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 06:52:25,429 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:52:25,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-23 06:52:25,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:52:25,459 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:25,460 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:52:25,460 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2020-12-23 06:52:25,460 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [968140775] [2020-12-23 06:52:25,461 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-23 06:52:25,461 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:25,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-23 06:52:25,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-12-23 06:52:25,462 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 9 states. [2020-12-23 06:52:25,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:25,497 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2020-12-23 06:52:25,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-23 06:52:25,498 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 10 [2020-12-23 06:52:25,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:25,498 INFO L225 Difference]: With dead ends: 16 [2020-12-23 06:52:25,498 INFO L226 Difference]: Without dead ends: 12 [2020-12-23 06:52:25,499 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 8 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-12-23 06:52:25,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-12-23 06:52:25,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-12-23 06:52:25,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-12-23 06:52:25,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-12-23 06:52:25,502 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-12-23 06:52:25,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:25,503 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-12-23 06:52:25,503 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-23 06:52:25,503 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-12-23 06:52:25,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-23 06:52:25,504 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:25,504 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:25,719 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:25,720 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:25,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:25,722 INFO L82 PathProgramCache]: Analyzing trace with hash 522938704, now seen corresponding path program 5 times [2020-12-23 06:52:25,722 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:25,723 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2139674524] [2020-12-23 06:52:25,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:25,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:25,905 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:25,905 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2139674524] [2020-12-23 06:52:25,905 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [18529943] [2020-12-23 06:52:25,906 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:26,011 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2020-12-23 06:52:26,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:52:26,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 23 conjunts are in the unsatisfiable core [2020-12-23 06:52:26,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:52:26,104 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:26,105 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:52:26,105 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2020-12-23 06:52:26,110 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701727303] [2020-12-23 06:52:26,110 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-23 06:52:26,111 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:26,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-23 06:52:26,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-12-23 06:52:26,115 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 10 states. [2020-12-23 06:52:26,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:26,175 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2020-12-23 06:52:26,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-23 06:52:26,176 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 11 [2020-12-23 06:52:26,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:26,177 INFO L225 Difference]: With dead ends: 17 [2020-12-23 06:52:26,178 INFO L226 Difference]: Without dead ends: 13 [2020-12-23 06:52:26,178 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 6 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-12-23 06:52:26,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-12-23 06:52:26,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-12-23 06:52:26,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-12-23 06:52:26,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-12-23 06:52:26,184 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-12-23 06:52:26,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:26,185 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-12-23 06:52:26,185 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-23 06:52:26,185 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-12-23 06:52:26,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-23 06:52:26,187 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:26,188 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:26,391 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-23 06:52:26,392 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:26,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:26,393 INFO L82 PathProgramCache]: Analyzing trace with hash -967103989, now seen corresponding path program 6 times [2020-12-23 06:52:26,393 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:26,394 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [844996988] [2020-12-23 06:52:26,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:26,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-23 06:52:26,422 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-23 06:52:26,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-23 06:52:26,460 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-23 06:52:26,485 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-23 06:52:26,486 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-23 06:52:26,486 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-12-23 06:52:26,529 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.12 06:52:26 BoogieIcfgContainer [2020-12-23 06:52:26,529 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-23 06:52:26,530 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-23 06:52:26,530 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-23 06:52:26,530 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-23 06:52:26,531 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 06:52:23" (3/4) ... [2020-12-23 06:52:26,533 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-23 06:52:26,589 INFO L141 WitnessManager]: Wrote witness to /storage/repos/svcomp/c/loop-acceleration/underapprox_2-1.c-witness.graphml [2020-12-23 06:52:26,589 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-23 06:52:26,591 INFO L168 Benchmark]: Toolchain (without parser) took 4101.53 ms. Allocated memory is still 151.0 MB. Free memory was 126.8 MB in the beginning and 64.8 MB in the end (delta: 62.0 MB). Peak memory consumption was 62.4 MB. Max. memory is 8.0 GB. [2020-12-23 06:52:26,592 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 151.0 MB. Free memory was 123.4 MB in the beginning and 123.3 MB in the end (delta: 118.6 kB). There was no memory consumed. Max. memory is 8.0 GB. [2020-12-23 06:52:26,592 INFO L168 Benchmark]: CACSL2BoogieTranslator took 217.16 ms. Allocated memory is still 151.0 MB. Free memory was 126.6 MB in the beginning and 117.5 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-12-23 06:52:26,595 INFO L168 Benchmark]: Boogie Procedure Inliner took 34.86 ms. Allocated memory is still 151.0 MB. Free memory was 117.5 MB in the beginning and 116.0 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-23 06:52:26,596 INFO L168 Benchmark]: Boogie Preprocessor took 21.29 ms. Allocated memory is still 151.0 MB. Free memory was 116.0 MB in the beginning and 115.1 MB in the end (delta: 954.5 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-23 06:52:26,596 INFO L168 Benchmark]: RCFGBuilder took 289.65 ms. Allocated memory is still 151.0 MB. Free memory was 115.1 MB in the beginning and 104.1 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2020-12-23 06:52:26,597 INFO L168 Benchmark]: TraceAbstraction took 3471.91 ms. Allocated memory is still 151.0 MB. Free memory was 103.5 MB in the beginning and 66.9 MB in the end (delta: 36.7 MB). Peak memory consumption was 37.3 MB. Max. memory is 8.0 GB. [2020-12-23 06:52:26,598 INFO L168 Benchmark]: Witness Printer took 59.32 ms. Allocated memory is still 151.0 MB. Free memory was 66.9 MB in the beginning and 64.8 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-12-23 06:52:26,608 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 151.0 MB. Free memory was 123.4 MB in the beginning and 123.3 MB in the end (delta: 118.6 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 217.16 ms. Allocated memory is still 151.0 MB. Free memory was 126.6 MB in the beginning and 117.5 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 34.86 ms. Allocated memory is still 151.0 MB. Free memory was 117.5 MB in the beginning and 116.0 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 21.29 ms. Allocated memory is still 151.0 MB. Free memory was 116.0 MB in the beginning and 115.1 MB in the end (delta: 954.5 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 289.65 ms. Allocated memory is still 151.0 MB. Free memory was 115.1 MB in the beginning and 104.1 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * TraceAbstraction took 3471.91 ms. Allocated memory is still 151.0 MB. Free memory was 103.5 MB in the beginning and 66.9 MB in the end (delta: 36.7 MB). Peak memory consumption was 37.3 MB. Max. memory is 8.0 GB. * Witness Printer took 59.32 ms. Allocated memory is still 151.0 MB. Free memory was 66.9 MB in the beginning and 64.8 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 7]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L13] unsigned int x = 0; [L14] unsigned int y = 1; [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND FALSE !(x < 6) [L6] COND TRUE !(cond) [L7] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 10 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.3s, OverallIterations: 7, TraceHistogramMax: 6, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 39 SDtfs, 2 SDslu, 93 SDs, 0 SdLazy, 190 SolverSat, 16 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 85 GetRequests, 35 SyntacticMatches, 18 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=13occurred in iteration=6, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.0s InterpolantComputationTime, 108 NumberOfCodeBlocks, 108 NumberOfCodeBlocksAsserted, 19 NumberOfCheckSat, 85 ConstructedInterpolants, 0 QuantifiedInterpolants, 2686 SizeOfPredicates, 0 NumberOfNonLiveVariables, 290 ConjunctsInSsa, 76 ConjunctsInUnsatCore, 11 InterpolantComputations, 1 PerfectInterpolantSequences, 0/70 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...