/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/sqrt1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-267fbe0 [2020-07-17 14:57:04,850 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-17 14:57:04,853 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-17 14:57:04,869 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-17 14:57:04,869 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-17 14:57:04,871 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-17 14:57:04,872 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-17 14:57:04,874 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-17 14:57:04,876 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-17 14:57:04,877 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-17 14:57:04,878 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-17 14:57:04,879 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-17 14:57:04,879 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-17 14:57:04,880 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-17 14:57:04,882 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-17 14:57:04,884 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-17 14:57:04,885 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-17 14:57:04,887 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-17 14:57:04,888 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-17 14:57:04,890 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-17 14:57:04,892 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-17 14:57:04,893 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-17 14:57:04,894 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-17 14:57:04,895 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-17 14:57:04,901 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-17 14:57:04,901 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-17 14:57:04,901 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-17 14:57:04,904 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-17 14:57:04,905 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-17 14:57:04,906 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-07-17 14:57:04,917 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-17 14:57:04,921 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-17 14:57:04,922 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-17 14:57:04,924 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-07-17 14:57:04,941 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-17 14:57:04,942 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-17 14:57:04,945 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-17 14:57:04,946 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-17 14:57:04,946 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-17 14:57:04,946 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-17 14:57:04,946 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-17 14:57:04,947 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-17 14:57:04,947 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-17 14:57:04,947 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-17 14:57:04,949 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-17 14:57:04,949 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-17 14:57:04,949 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-17 14:57:04,949 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-17 14:57:04,950 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-17 14:57:04,951 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-07-17 14:57:04,951 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-17 14:57:04,951 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-17 14:57:04,951 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-17 14:57:04,952 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-17 14:57:04,952 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-07-17 14:57:04,953 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-17 14:57:04,953 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-07-17 14:57:05,310 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-17 14:57:05,335 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-17 14:57:05,339 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-17 14:57:05,341 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-17 14:57:05,341 INFO L275 PluginConnector]: CDTParser initialized [2020-07-17 14:57:05,342 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/sqrt1.c [2020-07-17 14:57:05,451 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/513d3f2eb/6e94dd89ed2b4e3d988aa0d7c50a6197/FLAG6b8b8a760 [2020-07-17 14:57:06,208 INFO L306 CDTParser]: Found 1 translation units. [2020-07-17 14:57:06,209 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/sqrt1.c [2020-07-17 14:57:06,220 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/513d3f2eb/6e94dd89ed2b4e3d988aa0d7c50a6197/FLAG6b8b8a760 [2020-07-17 14:57:06,542 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/513d3f2eb/6e94dd89ed2b4e3d988aa0d7c50a6197 [2020-07-17 14:57:06,560 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-17 14:57:06,567 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-17 14:57:06,573 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-17 14:57:06,574 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-17 14:57:06,580 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-17 14:57:06,582 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.07 02:57:06" (1/1) ... [2020-07-17 14:57:06,588 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@45b6709 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 02:57:06, skipping insertion in model container [2020-07-17 14:57:06,588 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.07 02:57:06" (1/1) ... [2020-07-17 14:57:06,605 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-17 14:57:06,650 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-17 14:57:06,893 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-17 14:57:06,900 INFO L203 MainTranslator]: Completed pre-run [2020-07-17 14:57:06,926 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-17 14:57:06,949 INFO L208 MainTranslator]: Completed translation [2020-07-17 14:57:06,950 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 02:57:06 WrapperNode [2020-07-17 14:57:06,951 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-17 14:57:06,952 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-17 14:57:06,952 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-17 14:57:06,953 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-17 14:57:06,973 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 02:57:06" (1/1) ... [2020-07-17 14:57:06,974 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 02:57:06" (1/1) ... [2020-07-17 14:57:06,983 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 02:57:06" (1/1) ... [2020-07-17 14:57:06,984 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 02:57:06" (1/1) ... [2020-07-17 14:57:06,989 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 02:57:06" (1/1) ... [2020-07-17 14:57:07,101 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 02:57:06" (1/1) ... [2020-07-17 14:57:07,103 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 02:57:06" (1/1) ... [2020-07-17 14:57:07,108 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-17 14:57:07,108 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-17 14:57:07,108 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-17 14:57:07,109 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-17 14:57:07,110 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 02:57:06" (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 [2020-07-17 14:57:07,209 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-17 14:57:07,209 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-17 14:57:07,209 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-17 14:57:07,210 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-17 14:57:07,210 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-17 14:57:07,210 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-17 14:57:07,210 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-17 14:57:07,210 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-17 14:57:07,210 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-17 14:57:07,211 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-17 14:57:07,211 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-17 14:57:07,211 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-17 14:57:07,211 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-17 14:57:07,499 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-17 14:57:07,499 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-17 14:57:07,504 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.07 02:57:07 BoogieIcfgContainer [2020-07-17 14:57:07,504 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-17 14:57:07,506 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-17 14:57:07,509 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-17 14:57:07,513 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-17 14:57:07,514 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.07 02:57:06" (1/3) ... [2020-07-17 14:57:07,516 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1bba1bd6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.07 02:57:07, skipping insertion in model container [2020-07-17 14:57:07,516 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 02:57:06" (2/3) ... [2020-07-17 14:57:07,517 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1bba1bd6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.07 02:57:07, skipping insertion in model container [2020-07-17 14:57:07,517 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.07 02:57:07" (3/3) ... [2020-07-17 14:57:07,519 INFO L109 eAbstractionObserver]: Analyzing ICFG sqrt1.c [2020-07-17 14:57:07,532 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-07-17 14:57:07,543 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-17 14:57:07,557 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-17 14:57:07,585 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-17 14:57:07,586 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-17 14:57:07,586 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-07-17 14:57:07,586 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-17 14:57:07,586 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-17 14:57:07,586 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-17 14:57:07,587 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-17 14:57:07,587 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-17 14:57:07,605 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states. [2020-07-17 14:57:07,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-17 14:57:07,621 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 14:57:07,623 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 14:57:07,623 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 14:57:07,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 14:57:07,630 INFO L82 PathProgramCache]: Analyzing trace with hash 37246768, now seen corresponding path program 1 times [2020-07-17 14:57:07,641 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 14:57:07,642 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1675208038] [2020-07-17 14:57:07,642 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 14:57:07,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 14:57:07,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 14:57:07,819 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 14:57:07,823 INFO L192 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-17 14:57:07,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1675208038] [2020-07-17 14:57:07,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 14:57:07,831 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-17 14:57:07,831 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733475542] [2020-07-17 14:57:07,837 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-17 14:57:07,838 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 14:57:07,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-17 14:57:07,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-17 14:57:07,863 INFO L87 Difference]: Start difference. First operand 36 states. Second operand 2 states. [2020-07-17 14:57:07,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 14:57:07,910 INFO L93 Difference]: Finished difference Result 58 states and 80 transitions. [2020-07-17 14:57:07,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-17 14:57:07,913 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 19 [2020-07-17 14:57:07,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 14:57:07,929 INFO L225 Difference]: With dead ends: 58 [2020-07-17 14:57:07,929 INFO L226 Difference]: Without dead ends: 31 [2020-07-17 14:57:07,937 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-17 14:57:07,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-17 14:57:08,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-07-17 14:57:08,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-17 14:57:08,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2020-07-17 14:57:08,008 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 19 [2020-07-17 14:57:08,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 14:57:08,009 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2020-07-17 14:57:08,009 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-17 14:57:08,009 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2020-07-17 14:57:08,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-17 14:57:08,011 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 14:57:08,011 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 14:57:08,012 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-17 14:57:08,012 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 14:57:08,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 14:57:08,013 INFO L82 PathProgramCache]: Analyzing trace with hash 25062249, now seen corresponding path program 1 times [2020-07-17 14:57:08,013 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 14:57:08,014 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1608663326] [2020-07-17 14:57:08,014 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 14:57:08,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 14:57:08,299 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 9 [2020-07-17 14:57:08,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 14:57:08,349 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 14:57:08,350 INFO L192 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-17 14:57:08,351 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1608663326] [2020-07-17 14:57:08,351 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 14:57:08,352 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-17 14:57:08,352 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938069850] [2020-07-17 14:57:08,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-17 14:57:08,354 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 14:57:08,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-17 14:57:08,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-17 14:57:08,356 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand 6 states. [2020-07-17 14:57:08,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 14:57:08,560 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2020-07-17 14:57:08,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-17 14:57:08,561 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-07-17 14:57:08,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 14:57:08,563 INFO L225 Difference]: With dead ends: 46 [2020-07-17 14:57:08,563 INFO L226 Difference]: Without dead ends: 44 [2020-07-17 14:57:08,566 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-17 14:57:08,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-07-17 14:57:08,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 41. [2020-07-17 14:57:08,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-17 14:57:08,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 50 transitions. [2020-07-17 14:57:08,589 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 50 transitions. Word has length 19 [2020-07-17 14:57:08,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 14:57:08,590 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 50 transitions. [2020-07-17 14:57:08,590 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-17 14:57:08,591 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 50 transitions. [2020-07-17 14:57:08,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-17 14:57:08,592 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 14:57:08,592 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 14:57:08,592 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-07-17 14:57:08,592 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 14:57:08,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 14:57:08,593 INFO L82 PathProgramCache]: Analyzing trace with hash -1680832565, now seen corresponding path program 1 times [2020-07-17 14:57:08,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 14:57:08,594 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1039705788] [2020-07-17 14:57:08,594 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 14:57:08,623 INFO L192 leratedInterpolation]: Finished Analysing Program using PRECISE loop Acceleration [2020-07-17 14:57:08,624 WARN L168 FreeRefinementEngine]: Strategy FIXED_PREFERENCES was unsuccessful and could not determine trace feasibility [2020-07-17 14:57:08,624 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-17 14:57:08,631 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-07-17 14:57:08,652 WARN L231 ceAbstractionStarter]: Unable to decide correctness. Please check the following counterexample manually. [2020-07-17 14:57:08,652 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 17.07 02:57:08 BoogieIcfgContainer [2020-07-17 14:57:08,652 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-17 14:57:08,656 INFO L168 Benchmark]: Toolchain (without parser) took 2091.78 ms. Allocated memory was 136.3 MB in the beginning and 200.3 MB in the end (delta: 64.0 MB). Free memory was 101.8 MB in the beginning and 120.1 MB in the end (delta: -18.3 MB). Peak memory consumption was 45.7 MB. Max. memory is 7.1 GB. [2020-07-17 14:57:08,657 INFO L168 Benchmark]: CDTParser took 0.31 ms. Allocated memory is still 136.3 MB. Free memory was 119.7 MB in the beginning and 119.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-17 14:57:08,659 INFO L168 Benchmark]: CACSL2BoogieTranslator took 378.03 ms. Allocated memory is still 136.3 MB. Free memory was 101.4 MB in the beginning and 91.7 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-17 14:57:08,660 INFO L168 Benchmark]: Boogie Preprocessor took 156.00 ms. Allocated memory was 136.3 MB in the beginning and 200.3 MB in the end (delta: 64.0 MB). Free memory was 91.7 MB in the beginning and 179.1 MB in the end (delta: -87.3 MB). Peak memory consumption was 15.2 MB. Max. memory is 7.1 GB. [2020-07-17 14:57:08,661 INFO L168 Benchmark]: RCFGBuilder took 396.09 ms. Allocated memory is still 200.3 MB. Free memory was 179.1 MB in the beginning and 165.5 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. [2020-07-17 14:57:08,663 INFO L168 Benchmark]: TraceAbstraction took 1146.79 ms. Allocated memory is still 200.3 MB. Free memory was 165.5 MB in the beginning and 120.1 MB in the end (delta: 45.4 MB). Peak memory consumption was 45.4 MB. Max. memory is 7.1 GB. [2020-07-17 14:57:08,667 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.31 ms. Allocated memory is still 136.3 MB. Free memory was 119.7 MB in the beginning and 119.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 378.03 ms. Allocated memory is still 136.3 MB. Free memory was 101.4 MB in the beginning and 91.7 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 156.00 ms. Allocated memory was 136.3 MB in the beginning and 200.3 MB in the end (delta: 64.0 MB). Free memory was 91.7 MB in the beginning and 179.1 MB in the end (delta: -87.3 MB). Peak memory consumption was 15.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 396.09 ms. Allocated memory is still 200.3 MB. Free memory was 179.1 MB in the beginning and 165.5 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1146.79 ms. Allocated memory is still 200.3 MB. Free memory was 165.5 MB in the beginning and 120.1 MB in the end (delta: 45.4 MB). Peak memory consumption was 45.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 12]: 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: [L19] int n, a, s, t; [L20] n = __VERIFIER_nondet_int() [L22] a = 0 [L23] s = 1 [L24] t = 1 [L26] COND TRUE 1 [L27] CALL __VERIFIER_assert(t == 2*a + 1) [L10] COND FALSE !(!(cond)) [L27] RET __VERIFIER_assert(t == 2*a + 1) [L28] CALL __VERIFIER_assert(s == (a + 1) * (a + 1)) [L10] COND TRUE !(cond) [L12] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 41 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNKNOWN, OverallTime: 1.0s, OverallIterations: 3, TraceHistogramMax: 2, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 77 SDtfs, 12 SDslu, 121 SDs, 0 SdLazy, 32 SolverSat, 12 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 19 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=41occurred in iteration=2, 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, 2 MinimizatonAttempts, 3 StatesRemovedByMinimization, 1 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...