/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 0.1.25-3af5e1f [2020-09-04 17:58:13,632 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 17:58:13,637 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 17:58:13,672 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-04 17:58:13,673 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-04 17:58:13,682 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-04 17:58:13,686 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-04 17:58:13,689 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-04 17:58:13,694 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-04 17:58:13,695 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-04 17:58:13,697 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-04 17:58:13,700 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-04 17:58:13,701 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 17:58:13,706 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 17:58:13,709 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 17:58:13,712 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 17:58:13,714 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 17:58:13,718 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 17:58:13,721 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 17:58:13,733 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 17:58:13,736 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 17:58:13,737 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 17:58:13,739 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 17:58:13,740 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 17:58:13,756 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-04 17:58:13,779 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 17:58:13,782 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 17:58:13,783 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 17:58:13,785 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 17:58:13,804 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 17:58:13,804 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 17:58:13,809 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 17:58:13,809 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 17:58:13,810 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 17:58:13,810 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 17:58:13,810 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 17:58:13,811 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 17:58:13,811 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 17:58:13,811 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 17:58:13,812 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 17:58:13,813 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 17:58:13,813 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 17:58:13,813 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 17:58:13,814 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 17:58:13,814 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-09-04 17:58:13,814 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 17:58:13,815 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 17:58:13,815 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 17:58:13,815 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 17:58:13,815 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-09-04 17:58:13,816 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 17:58:13,816 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-09-04 17:58:14,352 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 17:58:14,374 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 17:58:14,382 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 17:58:14,385 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 17:58:14,386 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 17:58:14,387 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/sqrt1.c [2020-09-04 17:58:14,491 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/09995efcc/5bb7ba05b46a46b4b51c987e912c2f2c/FLAG766f87a59 [2020-09-04 17:58:15,178 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 17:58:15,180 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/nla-digbench/sqrt1.c [2020-09-04 17:58:15,195 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/09995efcc/5bb7ba05b46a46b4b51c987e912c2f2c/FLAG766f87a59 [2020-09-04 17:58:15,501 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/09995efcc/5bb7ba05b46a46b4b51c987e912c2f2c [2020-09-04 17:58:15,521 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 17:58:15,524 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 17:58:15,526 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 17:58:15,527 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 17:58:15,532 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 17:58:15,534 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 05:58:15" (1/1) ... [2020-09-04 17:58:15,540 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@554bc22e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:58:15, skipping insertion in model container [2020-09-04 17:58:15,540 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 05:58:15" (1/1) ... [2020-09-04 17:58:15,553 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 17:58:15,584 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 17:58:15,863 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 17:58:15,871 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 17:58:15,901 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 17:58:15,926 INFO L208 MainTranslator]: Completed translation [2020-09-04 17:58:15,926 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:58:15 WrapperNode [2020-09-04 17:58:15,927 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 17:58:15,928 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 17:58:15,928 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 17:58:15,929 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 17:58:15,952 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:58:15" (1/1) ... [2020-09-04 17:58:15,953 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:58:15" (1/1) ... [2020-09-04 17:58:16,059 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:58:15" (1/1) ... [2020-09-04 17:58:16,059 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:58:15" (1/1) ... [2020-09-04 17:58:16,071 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:58:15" (1/1) ... [2020-09-04 17:58:16,082 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:58:15" (1/1) ... [2020-09-04 17:58:16,088 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:58:15" (1/1) ... [2020-09-04 17:58:16,091 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 17:58:16,092 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 17:58:16,092 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 17:58:16,092 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 17:58:16,094 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:58:15" (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 17:58:16,191 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 17:58:16,191 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 17:58:16,191 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-09-04 17:58:16,192 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-04 17:58:16,192 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 17:58:16,192 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 17:58:16,192 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-04 17:58:16,193 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-09-04 17:58:16,193 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-09-04 17:58:16,193 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-04 17:58:16,193 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 17:58:16,193 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 17:58:16,193 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 17:58:16,541 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 17:58:16,541 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-09-04 17:58:16,549 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 05:58:16 BoogieIcfgContainer [2020-09-04 17:58:16,549 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 17:58:16,566 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 17:58:16,567 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 17:58:16,575 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 17:58:16,576 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 05:58:15" (1/3) ... [2020-09-04 17:58:16,578 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57969852 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 05:58:16, skipping insertion in model container [2020-09-04 17:58:16,579 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:58:15" (2/3) ... [2020-09-04 17:58:16,579 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57969852 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 05:58:16, skipping insertion in model container [2020-09-04 17:58:16,580 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 05:58:16" (3/3) ... [2020-09-04 17:58:16,583 INFO L109 eAbstractionObserver]: Analyzing ICFG sqrt1.c [2020-09-04 17:58:16,612 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-04 17:58:16,625 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 17:58:16,650 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 17:58:16,682 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 17:58:16,682 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 17:58:16,683 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-09-04 17:58:16,683 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 17:58:16,683 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 17:58:16,683 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 17:58:16,683 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 17:58:16,684 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 17:58:16,704 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states. [2020-09-04 17:58:16,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-09-04 17:58:16,720 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:58:16,722 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 17:58:16,722 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:58:16,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:58:16,731 INFO L82 PathProgramCache]: Analyzing trace with hash 37246768, now seen corresponding path program 1 times [2020-09-04 17:58:16,743 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:58:16,744 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [321237398] [2020-09-04 17:58:16,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:58:16,826 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:58:16,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:58:16,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:58:16,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:58:16,930 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 17:58:16,934 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [321237398] [2020-09-04 17:58:16,937 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:58:16,938 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-09-04 17:58:16,938 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399264352] [2020-09-04 17:58:16,945 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-09-04 17:58:16,945 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:58:16,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-09-04 17:58:16,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-09-04 17:58:16,964 INFO L87 Difference]: Start difference. First operand 36 states. Second operand 2 states. [2020-09-04 17:58:17,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:58:17,002 INFO L93 Difference]: Finished difference Result 58 states and 80 transitions. [2020-09-04 17:58:17,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-09-04 17:58:17,005 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 19 [2020-09-04 17:58:17,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:58:17,018 INFO L225 Difference]: With dead ends: 58 [2020-09-04 17:58:17,018 INFO L226 Difference]: Without dead ends: 31 [2020-09-04 17:58:17,024 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 17:58:17,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-09-04 17:58:17,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-09-04 17:58:17,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-09-04 17:58:17,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2020-09-04 17:58:17,083 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 19 [2020-09-04 17:58:17,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:58:17,084 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2020-09-04 17:58:17,084 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-09-04 17:58:17,084 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2020-09-04 17:58:17,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-09-04 17:58:17,085 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:58:17,086 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 17:58:17,086 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 17:58:17,086 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:58:17,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:58:17,087 INFO L82 PathProgramCache]: Analyzing trace with hash 25062249, now seen corresponding path program 1 times [2020-09-04 17:58:17,088 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:58:17,088 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [157211746] [2020-09-04 17:58:17,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:58:17,091 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:58:17,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:58:17,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:58:17,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:58:17,318 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 17:58:17,319 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [157211746] [2020-09-04 17:58:17,325 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:58:17,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-09-04 17:58:17,326 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555863406] [2020-09-04 17:58:17,328 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-04 17:58:17,329 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:58:17,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-04 17:58:17,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-09-04 17:58:17,330 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand 6 states. [2020-09-04 17:58:17,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:58:17,557 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2020-09-04 17:58:17,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-04 17:58:17,558 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-09-04 17:58:17,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:58:17,560 INFO L225 Difference]: With dead ends: 46 [2020-09-04 17:58:17,561 INFO L226 Difference]: Without dead ends: 44 [2020-09-04 17:58:17,563 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-09-04 17:58:17,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-09-04 17:58:17,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 41. [2020-09-04 17:58:17,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-09-04 17:58:17,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 50 transitions. [2020-09-04 17:58:17,587 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 50 transitions. Word has length 19 [2020-09-04 17:58:17,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:58:17,587 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 50 transitions. [2020-09-04 17:58:17,588 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-04 17:58:17,588 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 50 transitions. [2020-09-04 17:58:17,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-09-04 17:58:17,589 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:58:17,589 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] [2020-09-04 17:58:17,590 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-04 17:58:17,590 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:58:17,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:58:17,591 INFO L82 PathProgramCache]: Analyzing trace with hash -1680832565, now seen corresponding path program 1 times [2020-09-04 17:58:17,591 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:58:17,592 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1098057523] [2020-09-04 17:58:17,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:58:17,595 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:58:17,607 WARN L168 FreeRefinementEngine]: Strategy FIXED_PREFERENCES was unsuccessful and could not determine trace feasibility [2020-09-04 17:58:17,608 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-04 17:58:17,620 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-04 17:58:17,647 WARN L231 ceAbstractionStarter]: Unable to decide correctness. Please check the following counterexample manually. [2020-09-04 17:58:17,648 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.09 05:58:17 BoogieIcfgContainer [2020-09-04 17:58:17,648 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-04 17:58:17,653 INFO L168 Benchmark]: Toolchain (without parser) took 2128.05 ms. Allocated memory was 137.4 MB in the beginning and 201.3 MB in the end (delta: 64.0 MB). Free memory was 100.7 MB in the beginning and 120.5 MB in the end (delta: -19.8 MB). Peak memory consumption was 44.2 MB. Max. memory is 7.1 GB. [2020-09-04 17:58:17,655 INFO L168 Benchmark]: CDTParser took 0.41 ms. Allocated memory is still 137.4 MB. Free memory was 118.7 MB in the beginning and 118.5 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-04 17:58:17,656 INFO L168 Benchmark]: CACSL2BoogieTranslator took 401.22 ms. Allocated memory is still 137.4 MB. Free memory was 100.5 MB in the beginning and 90.8 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. [2020-09-04 17:58:17,657 INFO L168 Benchmark]: Boogie Preprocessor took 163.52 ms. Allocated memory was 137.4 MB in the beginning and 201.3 MB in the end (delta: 64.0 MB). Free memory was 90.8 MB in the beginning and 180.0 MB in the end (delta: -89.3 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. [2020-09-04 17:58:17,659 INFO L168 Benchmark]: RCFGBuilder took 458.00 ms. Allocated memory is still 201.3 MB. Free memory was 179.4 MB in the beginning and 165.9 MB in the end (delta: 13.4 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. [2020-09-04 17:58:17,660 INFO L168 Benchmark]: TraceAbstraction took 1082.47 ms. Allocated memory is still 201.3 MB. Free memory was 165.3 MB in the beginning and 120.5 MB in the end (delta: 44.7 MB). Peak memory consumption was 44.7 MB. Max. memory is 7.1 GB. [2020-09-04 17:58:17,665 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.41 ms. Allocated memory is still 137.4 MB. Free memory was 118.7 MB in the beginning and 118.5 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 401.22 ms. Allocated memory is still 137.4 MB. Free memory was 100.5 MB in the beginning and 90.8 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 163.52 ms. Allocated memory was 137.4 MB in the beginning and 201.3 MB in the end (delta: 64.0 MB). Free memory was 90.8 MB in the beginning and 180.0 MB in the end (delta: -89.3 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 458.00 ms. Allocated memory is still 201.3 MB. Free memory was 179.4 MB in the beginning and 165.9 MB in the end (delta: 13.4 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1082.47 ms. Allocated memory is still 201.3 MB. Free memory was 165.3 MB in the beginning and 120.5 MB in the end (delta: 44.7 MB). Peak memory consumption was 44.7 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: 0.9s, 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, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 14 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s 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...