/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/loops/nec20.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-86f66a4 [2020-07-07 13:58:47,284 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-07 13:58:47,286 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-07 13:58:47,298 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-07 13:58:47,299 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-07 13:58:47,300 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-07 13:58:47,301 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-07 13:58:47,303 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-07 13:58:47,305 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-07 13:58:47,306 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-07 13:58:47,307 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-07 13:58:47,308 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-07 13:58:47,308 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-07 13:58:47,313 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-07 13:58:47,314 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-07 13:58:47,318 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-07 13:58:47,318 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-07 13:58:47,322 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-07 13:58:47,324 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-07 13:58:47,325 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-07 13:58:47,327 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-07 13:58:47,331 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-07 13:58:47,332 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-07 13:58:47,333 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-07 13:58:47,335 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-07 13:58:47,343 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-07 13:58:47,344 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-07 13:58:47,344 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-07 13:58:47,345 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 13:58:47,354 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-07 13:58:47,355 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-07 13:58:47,356 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-07 13:58:47,356 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-07 13:58:47,356 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-07 13:58:47,357 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-07 13:58:47,357 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-07 13:58:47,357 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-07 13:58:47,357 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-07 13:58:47,357 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-07 13:58:47,358 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-07 13:58:47,358 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-07 13:58:47,358 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-07 13:58:47,358 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-07 13:58:47,358 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-07 13:58:47,359 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-07-07 13:58:47,359 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-07 13:58:47,359 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-07 13:58:47,359 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-07 13:58:47,359 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-07 13:58:47,360 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-07-07 13:58:47,360 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-07 13:58:47,360 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-07-07 13:58:47,648 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-07 13:58:47,665 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-07 13:58:47,668 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-07 13:58:47,669 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-07 13:58:47,670 INFO L275 PluginConnector]: CDTParser initialized [2020-07-07 13:58:47,670 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/nec20.c [2020-07-07 13:58:47,749 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8e8519925/d2944299ae6541dea624e53fc34a8655/FLAGfd6d8bf17 [2020-07-07 13:58:48,190 INFO L306 CDTParser]: Found 1 translation units. [2020-07-07 13:58:48,191 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/nec20.c [2020-07-07 13:58:48,197 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8e8519925/d2944299ae6541dea624e53fc34a8655/FLAGfd6d8bf17 [2020-07-07 13:58:48,639 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8e8519925/d2944299ae6541dea624e53fc34a8655 [2020-07-07 13:58:48,650 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-07 13:58:48,653 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-07 13:58:48,656 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-07 13:58:48,656 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-07 13:58:48,661 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-07 13:58:48,662 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.07 01:58:48" (1/1) ... [2020-07-07 13:58:48,665 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7e0bcb26 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:58:48, skipping insertion in model container [2020-07-07 13:58:48,665 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.07 01:58:48" (1/1) ... [2020-07-07 13:58:48,673 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-07 13:58:48,696 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-07 13:58:48,888 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-07 13:58:48,893 INFO L203 MainTranslator]: Completed pre-run [2020-07-07 13:58:48,909 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-07 13:58:48,923 INFO L208 MainTranslator]: Completed translation [2020-07-07 13:58:48,923 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:58:48 WrapperNode [2020-07-07 13:58:48,923 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-07 13:58:48,924 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-07 13:58:48,924 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-07 13:58:48,924 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-07 13:58:48,934 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:58:48" (1/1) ... [2020-07-07 13:58:48,935 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:58:48" (1/1) ... [2020-07-07 13:58:49,030 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:58:48" (1/1) ... [2020-07-07 13:58:49,031 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:58:48" (1/1) ... [2020-07-07 13:58:49,035 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:58:48" (1/1) ... [2020-07-07 13:58:49,041 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:58:48" (1/1) ... [2020-07-07 13:58:49,043 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:58:48" (1/1) ... [2020-07-07 13:58:49,044 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-07 13:58:49,045 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-07 13:58:49,045 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-07 13:58:49,045 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-07 13:58:49,046 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:58:48" (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 13:58:49,115 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-07 13:58:49,116 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-07 13:58:49,116 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-07 13:58:49,116 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-07 13:58:49,116 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-07 13:58:49,116 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-07 13:58:49,116 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-07 13:58:49,116 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-07 13:58:49,117 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-07 13:58:49,117 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-07 13:58:49,117 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-07 13:58:49,396 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-07 13:58:49,396 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-07 13:58:49,400 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.07 01:58:49 BoogieIcfgContainer [2020-07-07 13:58:49,400 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-07 13:58:49,402 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-07 13:58:49,402 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-07 13:58:49,405 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-07 13:58:49,405 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.07 01:58:48" (1/3) ... [2020-07-07 13:58:49,406 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4429c482 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.07 01:58:49, skipping insertion in model container [2020-07-07 13:58:49,406 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 01:58:48" (2/3) ... [2020-07-07 13:58:49,408 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4429c482 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.07 01:58:49, skipping insertion in model container [2020-07-07 13:58:49,408 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.07 01:58:49" (3/3) ... [2020-07-07 13:58:49,410 INFO L109 eAbstractionObserver]: Analyzing ICFG nec20.c [2020-07-07 13:58:49,425 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-07-07 13:58:49,435 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-07 13:58:49,454 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-07 13:58:49,481 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-07 13:58:49,482 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-07 13:58:49,482 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-07-07 13:58:49,482 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-07 13:58:49,482 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-07 13:58:49,482 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-07 13:58:49,483 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-07 13:58:49,483 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-07 13:58:49,504 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states. [2020-07-07 13:58:49,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-07 13:58:49,527 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 13:58:49,528 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] [2020-07-07 13:58:49,529 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 13:58:49,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 13:58:49,535 INFO L82 PathProgramCache]: Analyzing trace with hash -1806400052, now seen corresponding path program 1 times [2020-07-07 13:58:49,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-07 13:58:49,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [625051775] [2020-07-07 13:58:49,545 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 13:58:49,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:58:49,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:58:49,948 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 13:58:49,949 INFO L185 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-07 13:58:49,951 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [625051775] [2020-07-07 13:58:49,953 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 13:58:49,954 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-07 13:58:49,954 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816853537] [2020-07-07 13:58:49,960 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-07 13:58:49,961 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-07 13:58:49,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-07 13:58:49,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-07 13:58:49,980 INFO L87 Difference]: Start difference. First operand 42 states. Second operand 5 states. [2020-07-07 13:58:50,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 13:58:50,309 INFO L93 Difference]: Finished difference Result 85 states and 100 transitions. [2020-07-07 13:58:50,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-07 13:58:50,312 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 23 [2020-07-07 13:58:50,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 13:58:50,323 INFO L225 Difference]: With dead ends: 85 [2020-07-07 13:58:50,323 INFO L226 Difference]: Without dead ends: 43 [2020-07-07 13:58:50,327 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-07-07 13:58:50,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-07 13:58:50,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 34. [2020-07-07 13:58:50,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-07 13:58:50,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2020-07-07 13:58:50,379 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 23 [2020-07-07 13:58:50,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 13:58:50,379 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2020-07-07 13:58:50,380 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-07 13:58:50,380 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2020-07-07 13:58:50,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-07 13:58:50,381 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 13:58:50,381 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] [2020-07-07 13:58:50,382 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-07 13:58:50,382 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 13:58:50,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 13:58:50,383 INFO L82 PathProgramCache]: Analyzing trace with hash -1097761428, now seen corresponding path program 1 times [2020-07-07 13:58:50,383 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-07 13:58:50,383 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1537106418] [2020-07-07 13:58:50,384 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 13:58:50,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:58:50,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:58:50,516 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 13:58:50,517 INFO L185 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-07 13:58:50,517 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1537106418] [2020-07-07 13:58:50,518 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 13:58:50,518 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-07 13:58:50,518 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407861909] [2020-07-07 13:58:50,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-07 13:58:50,519 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-07 13:58:50,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-07 13:58:50,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-07 13:58:50,520 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 5 states. [2020-07-07 13:58:50,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 13:58:50,679 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-07-07 13:58:50,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-07 13:58:50,680 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 23 [2020-07-07 13:58:50,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 13:58:50,682 INFO L225 Difference]: With dead ends: 50 [2020-07-07 13:58:50,682 INFO L226 Difference]: Without dead ends: 44 [2020-07-07 13:58:50,684 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-07-07 13:58:50,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-07-07 13:58:50,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 30. [2020-07-07 13:58:50,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-07 13:58:50,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-07-07 13:58:50,696 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 23 [2020-07-07 13:58:50,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 13:58:50,697 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-07-07 13:58:50,697 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-07 13:58:50,697 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-07-07 13:58:50,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-07 13:58:50,699 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 13:58:50,699 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 13:58:50,699 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-07-07 13:58:50,699 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 13:58:50,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 13:58:50,700 INFO L82 PathProgramCache]: Analyzing trace with hash 1269377587, now seen corresponding path program 1 times [2020-07-07 13:58:50,712 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-07 13:58:50,712 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [990123067] [2020-07-07 13:58:50,713 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 13:58:50,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:58:50,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 13:58:50,900 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 13:58:50,900 INFO L185 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-07 13:58:50,901 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [990123067] [2020-07-07 13:58:50,901 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 13:58:50,901 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-07 13:58:50,902 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720286621] [2020-07-07 13:58:50,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-07 13:58:50,902 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-07 13:58:50,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-07 13:58:50,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-07-07 13:58:50,903 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 7 states. [2020-07-07 13:58:51,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 13:58:51,130 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2020-07-07 13:58:51,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-07 13:58:51,131 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 28 [2020-07-07 13:58:51,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 13:58:51,132 INFO L225 Difference]: With dead ends: 55 [2020-07-07 13:58:51,132 INFO L226 Difference]: Without dead ends: 49 [2020-07-07 13:58:51,133 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2020-07-07 13:58:51,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-07 13:58:51,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 39. [2020-07-07 13:58:51,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-07 13:58:51,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-07-07 13:58:51,148 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 28 [2020-07-07 13:58:51,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 13:58:51,148 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-07-07 13:58:51,148 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-07 13:58:51,148 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-07-07 13:58:51,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-07 13:58:51,149 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 13:58:51,150 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 13:58:51,150 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-07-07 13:58:51,150 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 13:58:51,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 13:58:51,151 INFO L82 PathProgramCache]: Analyzing trace with hash -1258948973, now seen corresponding path program 1 times [2020-07-07 13:58:51,151 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-07 13:58:51,151 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [88715704] [2020-07-07 13:58:51,152 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 13:58:51,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-07 13:58:51,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-07 13:58:51,211 INFO L185 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-07 13:58:51,212 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-07 13:58:51,212 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-07 13:58:51,213 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-07-07 13:58:51,230 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.07 01:58:51 BoogieIcfgContainer [2020-07-07 13:58:51,230 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-07 13:58:51,233 INFO L168 Benchmark]: Toolchain (without parser) took 2579.14 ms. Allocated memory was 135.8 MB in the beginning and 228.1 MB in the end (delta: 92.3 MB). Free memory was 100.5 MB in the beginning and 146.0 MB in the end (delta: -45.5 MB). Peak memory consumption was 46.8 MB. Max. memory is 7.1 GB. [2020-07-07 13:58:51,234 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 135.8 MB. Free memory was 119.2 MB in the beginning and 119.0 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-07 13:58:51,235 INFO L168 Benchmark]: CACSL2BoogieTranslator took 267.32 ms. Allocated memory is still 135.8 MB. Free memory was 100.3 MB in the beginning and 90.5 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-07-07 13:58:51,236 INFO L168 Benchmark]: Boogie Preprocessor took 120.66 ms. Allocated memory was 135.8 MB in the beginning and 200.3 MB in the end (delta: 64.5 MB). Free memory was 90.5 MB in the beginning and 178.5 MB in the end (delta: -88.1 MB). Peak memory consumption was 15.0 MB. Max. memory is 7.1 GB. [2020-07-07 13:58:51,237 INFO L168 Benchmark]: RCFGBuilder took 355.64 ms. Allocated memory is still 200.3 MB. Free memory was 177.8 MB in the beginning and 164.1 MB in the end (delta: 13.7 MB). Peak memory consumption was 13.7 MB. Max. memory is 7.1 GB. [2020-07-07 13:58:51,238 INFO L168 Benchmark]: TraceAbstraction took 1828.31 ms. Allocated memory was 200.3 MB in the beginning and 228.1 MB in the end (delta: 27.8 MB). Free memory was 163.4 MB in the beginning and 146.0 MB in the end (delta: 17.4 MB). Peak memory consumption was 45.2 MB. Max. memory is 7.1 GB. [2020-07-07 13:58:51,242 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 135.8 MB. Free memory was 119.2 MB in the beginning and 119.0 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 267.32 ms. Allocated memory is still 135.8 MB. Free memory was 100.3 MB in the beginning and 90.5 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 120.66 ms. Allocated memory was 135.8 MB in the beginning and 200.3 MB in the end (delta: 64.5 MB). Free memory was 90.5 MB in the beginning and 178.5 MB in the end (delta: -88.1 MB). Peak memory consumption was 15.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 355.64 ms. Allocated memory is still 200.3 MB. Free memory was 177.8 MB in the beginning and 164.1 MB in the end (delta: 13.7 MB). Peak memory consumption was 13.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1828.31 ms. Allocated memory was 200.3 MB in the beginning and 228.1 MB in the end (delta: 27.8 MB). Free memory was 163.4 MB in the beginning and 146.0 MB in the end (delta: 17.4 MB). Peak memory consumption was 45.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] int b; [L13] _Bool k=__VERIFIER_nondet_bool(); [L14] unsigned int i,n,j; [L15] int a[1025]; [L17] COND TRUE \read(k) [L18] n=0 [L23] i=0 [L24] j=__VERIFIER_nondet_uint() [L25] COND FALSE !(j > 10000) [L28] COND TRUE i <= n [L29] i++ [L30] j= j +2 [L28] COND FALSE !(i <= n) [L33] a[i]=0 [L34] CALL __VERIFIER_assert(j<1025) [L5] COND TRUE !(cond) [L6] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 42 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.7s, OverallIterations: 4, TraceHistogramMax: 1, AutomataDifference: 0.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 109 SDtfs, 175 SDslu, 53 SDs, 0 SdLazy, 240 SolverSat, 12 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 32 GetRequests, 9 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=42occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 3 MinimizatonAttempts, 33 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...