/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive-simple/id2_b3_o2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-86f66a4 [2020-07-07 13:08:20,659 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-07 13:08:20,661 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-07 13:08:20,673 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-07 13:08:20,674 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-07 13:08:20,675 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-07 13:08:20,676 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-07 13:08:20,678 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-07 13:08:20,679 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-07 13:08:20,680 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-07 13:08:20,681 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-07 13:08:20,682 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-07 13:08:20,683 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-07 13:08:20,683 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-07 13:08:20,684 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-07 13:08:20,685 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-07 13:08:20,686 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-07 13:08:20,687 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-07 13:08:20,689 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-07 13:08:20,691 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-07 13:08:20,692 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-07 13:08:20,693 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-07 13:08:20,694 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-07 13:08:20,695 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-07 13:08:20,697 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-07 13:08:20,705 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-07 13:08:20,706 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-07 13:08:20,706 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-07 13:08:20,707 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-07-07 13:08:20,720 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-07 13:08:20,723 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-07 13:08:20,724 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-07 13:08:20,724 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-07 13:08:20,724 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-07 13:08:20,724 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-07 13:08:20,725 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-07 13:08:20,725 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-07 13:08:20,725 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-07 13:08:20,725 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-07 13:08:20,726 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-07 13:08:20,726 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-07 13:08:20,726 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-07 13:08:20,726 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-07 13:08:20,726 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-07 13:08:20,727 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-07-07 13:08:20,727 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-07 13:08:20,727 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-07 13:08:20,727 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-07 13:08:20,727 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-07 13:08:20,727 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-07-07 13:08:20,728 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-07 13:08:20,728 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-07-07 13:08:21,003 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-07 13:08:21,022 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-07 13:08:21,025 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-07 13:08:21,026 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-07 13:08:21,026 INFO L275 PluginConnector]: CDTParser initialized [2020-07-07 13:08:21,026 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_b3_o2.c [2020-07-07 13:08:21,100 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1d8db180b/10359b1a2b68432c89e0516959388e39/FLAG1e4643e42 [2020-07-07 13:08:21,542 INFO L306 CDTParser]: Found 1 translation units. [2020-07-07 13:08:21,543 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_b3_o2.c [2020-07-07 13:08:21,549 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1d8db180b/10359b1a2b68432c89e0516959388e39/FLAG1e4643e42 [2020-07-07 13:08:21,904 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1d8db180b/10359b1a2b68432c89e0516959388e39 [2020-07-07 13:08:21,913 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-07 13:08:21,914 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-07 13:08:21,915 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-07 13:08:21,916 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-07 13:08:21,920 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-07 13:08:21,921 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.07 01:08:21" (1/1) ... [2020-07-07 13:08:21,927 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3e31444 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:08:21, skipping insertion in model container [2020-07-07 13:08:21,927 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.07 01:08:21" (1/1) ... [2020-07-07 13:08:21,936 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-07 13:08:21,955 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-07 13:08:22,118 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-07 13:08:22,122 INFO L203 MainTranslator]: Completed pre-run [2020-07-07 13:08:22,140 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-07 13:08:22,154 INFO L208 MainTranslator]: Completed translation [2020-07-07 13:08:22,155 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:08:22 WrapperNode [2020-07-07 13:08:22,155 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-07 13:08:22,156 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-07 13:08:22,156 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-07 13:08:22,156 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-07 13:08:22,169 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:08:22" (1/1) ... [2020-07-07 13:08:22,170 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:08:22" (1/1) ... [2020-07-07 13:08:22,175 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:08:22" (1/1) ... [2020-07-07 13:08:22,175 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:08:22" (1/1) ... [2020-07-07 13:08:22,179 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:08:22" (1/1) ... [2020-07-07 13:08:22,181 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:08:22" (1/1) ... [2020-07-07 13:08:22,182 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:08:22" (1/1) ... [2020-07-07 13:08:22,184 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-07 13:08:22,184 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-07 13:08:22,184 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-07 13:08:22,184 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-07 13:08:22,185 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:08:22" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-07 13:08:22,341 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-07 13:08:22,341 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-07 13:08:22,341 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-07 13:08:22,342 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-07-07 13:08:22,342 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-07 13:08:22,342 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-07 13:08:22,342 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-07 13:08:22,343 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-07 13:08:22,343 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-07-07 13:08:22,343 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-07 13:08:22,343 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-07 13:08:22,343 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-07 13:08:22,530 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-07 13:08:22,530 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-07 13:08:22,535 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.07 01:08:22 BoogieIcfgContainer [2020-07-07 13:08:22,535 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-07 13:08:22,547 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-07 13:08:22,547 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-07 13:08:22,551 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-07 13:08:22,552 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.07 01:08:21" (1/3) ... [2020-07-07 13:08:22,553 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48f40ddc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.07 01:08:22, skipping insertion in model container [2020-07-07 13:08:22,553 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:08:22" (2/3) ... [2020-07-07 13:08:22,554 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48f40ddc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.07 01:08:22, skipping insertion in model container [2020-07-07 13:08:22,554 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.07 01:08:22" (3/3) ... [2020-07-07 13:08:22,556 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_b3_o2.c [2020-07-07 13:08:22,588 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-07-07 13:08:22,596 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-07 13:08:22,625 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-07 13:08:22,644 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-07 13:08:22,644 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-07 13:08:22,644 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-07-07 13:08:22,644 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-07 13:08:22,645 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-07 13:08:22,645 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-07 13:08:22,645 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-07 13:08:22,645 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-07 13:08:22,660 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states. [2020-07-07 13:08:22,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-07 13:08:22,668 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 13:08:22,668 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 13:08:22,669 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 13:08:22,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 13:08:22,674 INFO L82 PathProgramCache]: Analyzing trace with hash 875745540, now seen corresponding path program 1 times [2020-07-07 13:08:22,681 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-07 13:08:22,682 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1530391125] [2020-07-07 13:08:22,682 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 13:08:22,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:22,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:22,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:22,945 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-07 13:08:22,946 INFO L185 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-07 13:08:22,948 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1530391125] [2020-07-07 13:08:22,950 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 13:08:22,950 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-07 13:08:22,951 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423138675] [2020-07-07 13:08:22,956 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-07 13:08:22,956 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-07 13:08:22,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-07 13:08:22,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-07 13:08:22,973 INFO L87 Difference]: Start difference. First operand 38 states. Second operand 5 states. [2020-07-07 13:08:23,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 13:08:23,056 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2020-07-07 13:08:23,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-07 13:08:23,057 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-07-07 13:08:23,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 13:08:23,068 INFO L225 Difference]: With dead ends: 51 [2020-07-07 13:08:23,068 INFO L226 Difference]: Without dead ends: 36 [2020-07-07 13:08:23,072 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-07 13:08:23,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-07 13:08:23,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-07 13:08:23,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-07 13:08:23,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2020-07-07 13:08:23,119 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 16 [2020-07-07 13:08:23,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 13:08:23,120 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2020-07-07 13:08:23,120 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-07 13:08:23,121 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2020-07-07 13:08:23,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-07 13:08:23,123 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 13:08:23,123 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 13:08:23,124 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-07 13:08:23,124 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 13:08:23,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 13:08:23,125 INFO L82 PathProgramCache]: Analyzing trace with hash 71846672, now seen corresponding path program 1 times [2020-07-07 13:08:23,125 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-07 13:08:23,126 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [520425803] [2020-07-07 13:08:23,126 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 13:08:23,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:23,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:23,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:23,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:08:23,386 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-07 13:08:23,386 INFO L185 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-07 13:08:23,387 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [520425803] [2020-07-07 13:08:23,387 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 13:08:23,387 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-07 13:08:23,388 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053881846] [2020-07-07 13:08:23,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-07 13:08:23,389 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-07 13:08:23,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-07 13:08:23,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-07-07 13:08:23,390 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand 8 states. [2020-07-07 13:08:23,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 13:08:23,497 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2020-07-07 13:08:23,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-07 13:08:23,498 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2020-07-07 13:08:23,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 13:08:23,500 INFO L225 Difference]: With dead ends: 66 [2020-07-07 13:08:23,500 INFO L226 Difference]: Without dead ends: 44 [2020-07-07 13:08:23,505 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2020-07-07 13:08:23,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-07-07 13:08:23,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2020-07-07 13:08:23,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-07 13:08:23,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2020-07-07 13:08:23,523 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 25 [2020-07-07 13:08:23,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 13:08:23,525 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2020-07-07 13:08:23,525 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-07 13:08:23,525 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2020-07-07 13:08:23,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-07 13:08:23,528 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 13:08:23,529 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 13:08:23,529 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-07-07 13:08:23,529 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 13:08:23,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 13:08:23,530 INFO L82 PathProgramCache]: Analyzing trace with hash -511991682, now seen corresponding path program 1 times [2020-07-07 13:08:23,530 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-07 13:08:23,532 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1241099212] [2020-07-07 13:08:23,532 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 13:08:23,566 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-07-07 13:08:23,568 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.NullPointerException at de.uni_freiburg.informatik.ultimate.lib.acceleratedinterpolation.AcceleratedInterpolation.generateMetaTrace(AcceleratedInterpolation.java:442) at de.uni_freiburg.informatik.ultimate.lib.acceleratedinterpolation.AcceleratedInterpolation.acceleratedInterpolationCore(AcceleratedInterpolation.java:277) at de.uni_freiburg.informatik.ultimate.lib.acceleratedinterpolation.AcceleratedInterpolation.(AcceleratedInterpolation.java:184) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModulePreferences.construct(IpTcStrategyModulePreferences.java:144) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.isCorrect(IpTcStrategyModuleBase.java:57) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.checkFeasibility(AutomatonFreeRefinementEngine.java:242) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:166) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:75) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:508) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:436) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:370) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:334) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:120) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:317) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) [2020-07-07 13:08:23,576 INFO L168 Benchmark]: Toolchain (without parser) took 1659.56 ms. Allocated memory was 137.4 MB in the beginning and 201.3 MB in the end (delta: 64.0 MB). Free memory was 101.7 MB in the beginning and 105.0 MB in the end (delta: -3.3 MB). Peak memory consumption was 60.7 MB. Max. memory is 7.1 GB. [2020-07-07 13:08:23,578 INFO L168 Benchmark]: CDTParser took 0.13 ms. Allocated memory is still 137.4 MB. Free memory was 119.5 MB in the beginning and 119.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-07 13:08:23,579 INFO L168 Benchmark]: CACSL2BoogieTranslator took 240.10 ms. Allocated memory is still 137.4 MB. Free memory was 101.5 MB in the beginning and 91.9 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. [2020-07-07 13:08:23,581 INFO L168 Benchmark]: Boogie Preprocessor took 27.88 ms. Allocated memory is still 137.4 MB. Free memory was 91.9 MB in the beginning and 90.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-07 13:08:23,583 INFO L168 Benchmark]: RCFGBuilder took 351.50 ms. Allocated memory was 137.4 MB in the beginning and 201.3 MB in the end (delta: 64.0 MB). Free memory was 90.5 MB in the beginning and 167.8 MB in the end (delta: -77.4 MB). Peak memory consumption was 14.4 MB. Max. memory is 7.1 GB. [2020-07-07 13:08:23,584 INFO L168 Benchmark]: TraceAbstraction took 1024.73 ms. Allocated memory is still 201.3 MB. Free memory was 167.2 MB in the beginning and 105.0 MB in the end (delta: 62.1 MB). Peak memory consumption was 62.1 MB. Max. memory is 7.1 GB. [2020-07-07 13:08:23,595 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.13 ms. Allocated memory is still 137.4 MB. Free memory was 119.5 MB in the beginning and 119.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 240.10 ms. Allocated memory is still 137.4 MB. Free memory was 101.5 MB in the beginning and 91.9 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 27.88 ms. Allocated memory is still 137.4 MB. Free memory was 91.9 MB in the beginning and 90.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 351.50 ms. Allocated memory was 137.4 MB in the beginning and 201.3 MB in the end (delta: 64.0 MB). Free memory was 90.5 MB in the beginning and 167.8 MB in the end (delta: -77.4 MB). Peak memory consumption was 14.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1024.73 ms. Allocated memory is still 201.3 MB. Free memory was 167.2 MB in the beginning and 105.0 MB in the end (delta: 62.1 MB). Peak memory consumption was 62.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: NullPointerException: null de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: NullPointerException: null: de.uni_freiburg.informatik.ultimate.lib.acceleratedinterpolation.AcceleratedInterpolation.generateMetaTrace(AcceleratedInterpolation.java:442) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request...