/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/nla-digbench/ps2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-3af5e1f [2020-09-04 17:58:10,407 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 17:58:10,412 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 17:58:10,440 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-09-04 17:58:10,454 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 17:58:10,455 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 17:58:10,456 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 17:58:10,458 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 17:58:10,459 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 17:58:10,461 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 17:58:10,463 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 17:58:10,466 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 17:58:10,468 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 17:58:10,469 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 17:58:10,471 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 17:58:10,472 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 17:58:10,475 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-04 17:58:10,486 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 17:58:10,487 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 17:58:10,489 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 17:58:10,490 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-09-04 17:58:10,504 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 17:58:10,504 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 17:58:10,506 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 17:58:10,507 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 17:58:10,507 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 17:58:10,507 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 17:58:10,507 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 17:58:10,507 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 17:58:10,508 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 17:58:10,508 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 17:58:10,508 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 17:58:10,508 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 17:58:10,509 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 17:58:10,509 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 17:58:10,509 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 17:58:10,509 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-09-04 17:58:10,509 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 17:58:10,510 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 17:58:10,510 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 17:58:10,510 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 17:58:10,510 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-09-04 17:58:10,511 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 17:58:10,511 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-09-04 17:58:10,970 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 17:58:11,000 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 17:58:11,005 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 17:58:11,008 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 17:58:11,009 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 17:58:11,010 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/ps2.c [2020-09-04 17:58:11,128 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/260027dc0/9d28bfb87d334021a0396cc5b6d90535/FLAGe14297039 [2020-09-04 17:58:11,780 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 17:58:11,781 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/nla-digbench/ps2.c [2020-09-04 17:58:11,792 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/260027dc0/9d28bfb87d334021a0396cc5b6d90535/FLAGe14297039 [2020-09-04 17:58:12,119 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/260027dc0/9d28bfb87d334021a0396cc5b6d90535 [2020-09-04 17:58:12,142 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 17:58:12,148 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 17:58:12,155 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 17:58:12,155 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 17:58:12,161 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 17:58:12,162 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 05:58:12" (1/1) ... [2020-09-04 17:58:12,168 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3dc17a6d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:58:12, skipping insertion in model container [2020-09-04 17:58:12,169 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 05:58:12" (1/1) ... [2020-09-04 17:58:12,185 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 17:58:12,222 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 17:58:12,468 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 17:58:12,475 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 17:58:12,501 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 17:58:12,525 INFO L208 MainTranslator]: Completed translation [2020-09-04 17:58:12,526 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:58:12 WrapperNode [2020-09-04 17:58:12,526 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 17:58:12,528 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 17:58:12,528 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 17:58:12,528 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 17:58:12,550 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:58:12" (1/1) ... [2020-09-04 17:58:12,550 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:58:12" (1/1) ... [2020-09-04 17:58:12,559 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:58:12" (1/1) ... [2020-09-04 17:58:12,560 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:58:12" (1/1) ... [2020-09-04 17:58:12,565 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:58:12" (1/1) ... [2020-09-04 17:58:12,574 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:58:12" (1/1) ... [2020-09-04 17:58:12,575 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:58:12" (1/1) ... [2020-09-04 17:58:12,668 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 17:58:12,669 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 17:58:12,670 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 17:58:12,673 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 17:58:12,675 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:58:12" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 17:58:12,777 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 17:58:12,778 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 17:58:12,778 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-09-04 17:58:12,778 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-04 17:58:12,778 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 17:58:12,779 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 17:58:12,779 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-04 17:58:12,779 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-09-04 17:58:12,780 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-09-04 17:58:12,781 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-04 17:58:12,782 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 17:58:12,782 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 17:58:12,782 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 17:58:13,080 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 17:58:13,081 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-09-04 17:58:13,089 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 05:58:13 BoogieIcfgContainer [2020-09-04 17:58:13,090 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 17:58:13,092 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 17:58:13,092 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 17:58:13,097 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 17:58:13,097 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 05:58:12" (1/3) ... [2020-09-04 17:58:13,098 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6349dbee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 05:58:13, skipping insertion in model container [2020-09-04 17:58:13,099 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:58:12" (2/3) ... [2020-09-04 17:58:13,099 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6349dbee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 05:58:13, skipping insertion in model container [2020-09-04 17:58:13,100 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 05:58:13" (3/3) ... [2020-09-04 17:58:13,103 INFO L109 eAbstractionObserver]: Analyzing ICFG ps2.c [2020-09-04 17:58:13,121 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-04 17:58:13,136 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 17:58:13,163 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 17:58:13,227 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 17:58:13,228 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 17:58:13,228 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-09-04 17:58:13,228 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 17:58:13,228 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 17:58:13,228 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 17:58:13,229 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 17:58:13,229 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 17:58:13,249 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states. [2020-09-04 17:58:13,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-09-04 17:58:13,265 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:58:13,266 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:58:13,267 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:58:13,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:58:13,276 INFO L82 PathProgramCache]: Analyzing trace with hash 41942830, now seen corresponding path program 1 times [2020-09-04 17:58:13,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:58:13,290 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [517011092] [2020-09-04 17:58:13,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:58:13,369 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:58:13,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:58:13,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:58:13,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:58:13,481 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 17:58:13,485 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [517011092] [2020-09-04 17:58:13,488 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:58:13,488 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-09-04 17:58:13,489 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1877625698] [2020-09-04 17:58:13,498 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-09-04 17:58:13,498 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:58:13,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-09-04 17:58:13,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-09-04 17:58:13,524 INFO L87 Difference]: Start difference. First operand 32 states. Second operand 2 states. [2020-09-04 17:58:13,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:58:13,568 INFO L93 Difference]: Finished difference Result 50 states and 60 transitions. [2020-09-04 17:58:13,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-09-04 17:58:13,570 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 19 [2020-09-04 17:58:13,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:58:13,587 INFO L225 Difference]: With dead ends: 50 [2020-09-04 17:58:13,587 INFO L226 Difference]: Without dead ends: 27 [2020-09-04 17:58:13,594 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-09-04 17:58:13,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-09-04 17:58:13,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-09-04 17:58:13,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-09-04 17:58:13,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-09-04 17:58:13,663 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 19 [2020-09-04 17:58:13,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:58:13,664 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-09-04 17:58:13,664 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-09-04 17:58:13,665 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-09-04 17:58:13,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-09-04 17:58:13,666 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:58:13,666 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:58:13,667 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 17:58:13,667 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:58:13,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:58:13,668 INFO L82 PathProgramCache]: Analyzing trace with hash 31724517, now seen corresponding path program 1 times [2020-09-04 17:58:13,668 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:58:13,669 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2094652628] [2020-09-04 17:58:13,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:58:13,671 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:58:13,682 WARN L168 FreeRefinementEngine]: Strategy FIXED_PREFERENCES was unsuccessful and could not determine trace feasibility [2020-09-04 17:58:13,683 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-04 17:58:13,691 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-04 17:58:13,714 WARN L231 ceAbstractionStarter]: Unable to decide correctness. Please check the following counterexample manually. [2020-09-04 17:58:13,715 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.09 05:58:13 BoogieIcfgContainer [2020-09-04 17:58:13,715 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-04 17:58:13,720 INFO L168 Benchmark]: Toolchain (without parser) took 1570.93 ms. Allocated memory was 137.4 MB in the beginning and 201.3 MB in the end (delta: 64.0 MB). Free memory was 101.5 MB in the beginning and 144.4 MB in the end (delta: -42.9 MB). Peak memory consumption was 21.0 MB. Max. memory is 7.1 GB. [2020-09-04 17:58:13,721 INFO L168 Benchmark]: CDTParser took 1.24 ms. Allocated memory is still 137.4 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-04 17:58:13,722 INFO L168 Benchmark]: CACSL2BoogieTranslator took 372.21 ms. Allocated memory is still 137.4 MB. Free memory was 101.3 MB in the beginning and 91.8 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-09-04 17:58:13,724 INFO L168 Benchmark]: Boogie Preprocessor took 141.11 ms. Allocated memory was 137.4 MB in the beginning and 201.3 MB in the end (delta: 64.0 MB). Free memory was 91.8 MB in the beginning and 181.3 MB in the end (delta: -89.5 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. [2020-09-04 17:58:13,725 INFO L168 Benchmark]: RCFGBuilder took 420.74 ms. Allocated memory is still 201.3 MB. Free memory was 181.3 MB in the beginning and 166.7 MB in the end (delta: 14.6 MB). Peak memory consumption was 14.6 MB. Max. memory is 7.1 GB. [2020-09-04 17:58:13,726 INFO L168 Benchmark]: TraceAbstraction took 623.37 ms. Allocated memory is still 201.3 MB. Free memory was 166.0 MB in the beginning and 144.4 MB in the end (delta: 21.6 MB). Peak memory consumption was 21.6 MB. Max. memory is 7.1 GB. [2020-09-04 17:58:13,730 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.24 ms. Allocated memory is still 137.4 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 372.21 ms. Allocated memory is still 137.4 MB. Free memory was 101.3 MB in the beginning and 91.8 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 141.11 ms. Allocated memory was 137.4 MB in the beginning and 201.3 MB in the end (delta: 64.0 MB). Free memory was 91.8 MB in the beginning and 181.3 MB in the end (delta: -89.5 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 420.74 ms. Allocated memory is still 201.3 MB. Free memory was 181.3 MB in the beginning and 166.7 MB in the end (delta: 14.6 MB). Peak memory consumption was 14.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 623.37 ms. Allocated memory is still 201.3 MB. Free memory was 166.0 MB in the beginning and 144.4 MB in the end (delta: 21.6 MB). Peak memory consumption was 21.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 10]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: unable to decide satisfiability of path constraint. Possible FailurePath: [L16] int k, y, x, c; [L17] k = __VERIFIER_nondet_int() [L19] y = 0 [L20] x = 0 [L21] c = 0 [L23] COND TRUE 1 [L24] CALL __VERIFIER_assert((y * y) - 2 * x + y == 0) [L8] COND TRUE !(cond) [L10] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 37 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNKNOWN, OverallTime: 0.4s, OverallIterations: 2, TraceHistogramMax: 1, AutomataDifference: 0.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 33 SDtfs, 0 SDslu, 0 SDs, 0 SdLazy, 0 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=32occurred 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, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 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 could not prove your program: unable to determine feasibility of some traces Received shutdown request...