/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.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 0.2.0-b8ad66e [2020-10-23 22:05:04,635 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 22:05:04,638 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 22:05:04,679 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-10-23 22:05:04,691 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-23 22:05:04,692 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-23 22:05:04,694 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-23 22:05:04,695 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-23 22:05:04,696 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-23 22:05:04,697 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-23 22:05:04,699 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-23 22:05:04,701 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-23 22:05:04,717 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-23 22:05:04,718 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-23 22:05:04,724 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-23 22:05:04,725 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-23 22:05:04,728 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-10-23 22:05:04,736 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-23 22:05:04,737 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-23 22:05:04,738 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-23 22:05:04,739 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-10-23 22:05:04,750 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 22:05:04,750 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 22:05:04,751 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 22:05:04,752 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 22:05:04,752 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 22:05:04,752 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 22:05:04,752 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 22:05:04,752 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 22:05:04,753 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 22:05:04,753 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 22:05:04,753 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 22:05:04,753 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 22:05:04,753 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 22:05:04,754 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 22:05:04,754 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 22:05:04,754 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-10-23 22:05:04,754 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 22:05:04,754 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 22:05:04,755 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 22:05:04,755 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 22:05:04,755 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-10-23 22:05:04,755 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 22:05:04,755 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 22:05:05,126 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 22:05:05,178 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 22:05:05,182 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 22:05:05,183 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 22:05:05,184 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 22:05:05,184 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/sqrt1.c [2020-10-23 22:05:05,267 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a776253cb/a47b55fb664643bd9e327a366912f076/FLAGa778bdeac [2020-10-23 22:05:05,918 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 22:05:05,919 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/sqrt1.c [2020-10-23 22:05:05,926 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a776253cb/a47b55fb664643bd9e327a366912f076/FLAGa778bdeac [2020-10-23 22:05:06,291 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a776253cb/a47b55fb664643bd9e327a366912f076 [2020-10-23 22:05:06,294 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 22:05:06,301 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 22:05:06,302 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 22:05:06,303 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 22:05:06,306 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 22:05:06,307 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 10:05:06" (1/1) ... [2020-10-23 22:05:06,314 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2b607e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:05:06, skipping insertion in model container [2020-10-23 22:05:06,314 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 10:05:06" (1/1) ... [2020-10-23 22:05:06,322 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 22:05:06,336 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 22:05:06,540 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 22:05:06,549 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 22:05:06,569 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 22:05:06,584 INFO L208 MainTranslator]: Completed translation [2020-10-23 22:05:06,585 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:05:06 WrapperNode [2020-10-23 22:05:06,585 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 22:05:06,586 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 22:05:06,586 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 22:05:06,587 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 22:05:06,599 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:05:06" (1/1) ... [2020-10-23 22:05:06,599 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:05:06" (1/1) ... [2020-10-23 22:05:06,606 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:05:06" (1/1) ... [2020-10-23 22:05:06,606 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:05:06" (1/1) ... [2020-10-23 22:05:06,612 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:05:06" (1/1) ... [2020-10-23 22:05:06,616 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:05:06" (1/1) ... [2020-10-23 22:05:06,618 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:05:06" (1/1) ... [2020-10-23 22:05:06,620 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 22:05:06,621 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 22:05:06,621 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 22:05:06,621 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 22:05:06,622 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:05:06" (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 [2020-10-23 22:05:06,692 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 22:05:06,692 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 22:05:06,692 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 22:05:06,692 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-10-23 22:05:06,693 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-23 22:05:06,693 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 22:05:06,693 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 22:05:06,693 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 22:05:06,693 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 22:05:06,694 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 22:05:06,694 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-23 22:05:06,694 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-10-23 22:05:06,694 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-23 22:05:06,694 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 22:05:06,694 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 22:05:06,695 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 22:05:06,695 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 22:05:06,695 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 22:05:06,695 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 22:05:06,695 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 22:05:06,958 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 22:05:06,959 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-23 22:05:06,961 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 10:05:06 BoogieIcfgContainer [2020-10-23 22:05:06,962 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 22:05:06,964 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 22:05:06,964 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 22:05:06,969 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 22:05:06,969 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 10:05:06" (1/3) ... [2020-10-23 22:05:06,970 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33a04929 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 10:05:06, skipping insertion in model container [2020-10-23 22:05:06,970 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:05:06" (2/3) ... [2020-10-23 22:05:06,971 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33a04929 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 10:05:06, skipping insertion in model container [2020-10-23 22:05:06,971 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 10:05:06" (3/3) ... [2020-10-23 22:05:06,973 INFO L111 eAbstractionObserver]: Analyzing ICFG sqrt1.c [2020-10-23 22:05:06,988 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-23 22:05:06,994 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 22:05:07,021 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 22:05:07,076 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 22:05:07,076 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 22:05:07,076 INFO L379 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-10-23 22:05:07,077 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 22:05:07,077 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 22:05:07,077 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 22:05:07,077 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 22:05:07,077 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 22:05:07,098 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states. [2020-10-23 22:05:07,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-10-23 22:05:07,108 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 22:05:07,109 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 22:05:07,109 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 22:05:07,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 22:05:07,117 INFO L82 PathProgramCache]: Analyzing trace with hash 1636349943, now seen corresponding path program 1 times [2020-10-23 22:05:07,127 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 22:05:07,127 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1543939490] [2020-10-23 22:05:07,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 22:05:07,211 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 22:05:07,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:05:07,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 22:05:07,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:05:07,587 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 22:05:07,591 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1543939490] [2020-10-23 22:05:07,593 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 22:05:07,593 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-23 22:05:07,595 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406157684] [2020-10-23 22:05:07,600 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-10-23 22:05:07,602 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 22:05:07,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-10-23 22:05:07,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-23 22:05:07,623 INFO L87 Difference]: Start difference. First operand 47 states. Second operand 3 states. [2020-10-23 22:05:07,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 22:05:07,803 INFO L93 Difference]: Finished difference Result 70 states and 93 transitions. [2020-10-23 22:05:07,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-10-23 22:05:07,805 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-10-23 22:05:07,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 22:05:07,814 INFO L225 Difference]: With dead ends: 70 [2020-10-23 22:05:07,814 INFO L226 Difference]: Without dead ends: 40 [2020-10-23 22:05:07,818 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-23 22:05:07,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-10-23 22:05:07,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-10-23 22:05:07,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-10-23 22:05:07,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 45 transitions. [2020-10-23 22:05:07,872 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 45 transitions. Word has length 28 [2020-10-23 22:05:07,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 22:05:07,872 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 45 transitions. [2020-10-23 22:05:07,872 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-10-23 22:05:07,873 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 45 transitions. [2020-10-23 22:05:07,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-10-23 22:05:07,874 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 22:05:07,874 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 22:05:07,874 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 22:05:07,874 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 22:05:07,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 22:05:07,876 INFO L82 PathProgramCache]: Analyzing trace with hash 1258629854, now seen corresponding path program 1 times [2020-10-23 22:05:07,876 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 22:05:07,876 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [661097141] [2020-10-23 22:05:07,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 22:05:07,880 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 22:05:07,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:05:08,006 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 22:05:08,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:05:08,022 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 22:05:08,023 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [661097141] [2020-10-23 22:05:08,023 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 22:05:08,023 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-10-23 22:05:08,023 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115953513] [2020-10-23 22:05:08,024 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-23 22:05:08,024 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 22:05:08,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-23 22:05:08,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-10-23 22:05:08,026 INFO L87 Difference]: Start difference. First operand 40 states and 45 transitions. Second operand 7 states. [2020-10-23 22:05:08,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 22:05:08,443 INFO L93 Difference]: Finished difference Result 56 states and 66 transitions. [2020-10-23 22:05:08,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-23 22:05:08,444 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 28 [2020-10-23 22:05:08,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 22:05:08,446 INFO L225 Difference]: With dead ends: 56 [2020-10-23 22:05:08,446 INFO L226 Difference]: Without dead ends: 53 [2020-10-23 22:05:08,448 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2020-10-23 22:05:08,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-10-23 22:05:08,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-10-23 22:05:08,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-10-23 22:05:08,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 59 transitions. [2020-10-23 22:05:08,470 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 59 transitions. Word has length 28 [2020-10-23 22:05:08,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 22:05:08,470 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 59 transitions. [2020-10-23 22:05:08,470 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-23 22:05:08,471 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 59 transitions. [2020-10-23 22:05:08,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-10-23 22:05:08,472 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 22:05:08,472 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 22:05:08,472 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-23 22:05:08,473 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 22:05:08,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 22:05:08,474 INFO L82 PathProgramCache]: Analyzing trace with hash -1821019559, now seen corresponding path program 1 times [2020-10-23 22:05:08,474 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 22:05:08,474 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1848183565] [2020-10-23 22:05:08,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 22:05:08,478 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 22:05:08,493 WARN L167 FreeRefinementEngine]: Strategy FIXED_PREFERENCES was unsuccessful and could not determine trace feasibility [2020-10-23 22:05:08,494 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-23 22:05:08,498 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-23 22:05:08,512 WARN L238 ceAbstractionStarter]: Unable to decide correctness. Please check the following counterexample manually. [2020-10-23 22:05:08,512 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 10:05:08 BoogieIcfgContainer [2020-10-23 22:05:08,513 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-23 22:05:08,515 INFO L168 Benchmark]: Toolchain (without parser) took 2218.12 ms. Allocated memory was 151.0 MB in the beginning and 187.7 MB in the end (delta: 36.7 MB). Free memory was 126.9 MB in the beginning and 151.2 MB in the end (delta: -24.3 MB). Peak memory consumption was 14.4 MB. Max. memory is 8.0 GB. [2020-10-23 22:05:08,516 INFO L168 Benchmark]: CDTParser took 1.01 ms. Allocated memory is still 151.0 MB. Free memory is still 124.9 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 22:05:08,517 INFO L168 Benchmark]: CACSL2BoogieTranslator took 283.02 ms. Allocated memory is still 151.0 MB. Free memory was 126.1 MB in the beginning and 116.7 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-10-23 22:05:08,518 INFO L168 Benchmark]: Boogie Preprocessor took 33.95 ms. Allocated memory is still 151.0 MB. Free memory was 116.7 MB in the beginning and 115.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-10-23 22:05:08,519 INFO L168 Benchmark]: RCFGBuilder took 340.94 ms. Allocated memory is still 151.0 MB. Free memory was 115.2 MB in the beginning and 100.3 MB in the end (delta: 14.9 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. [2020-10-23 22:05:08,520 INFO L168 Benchmark]: TraceAbstraction took 1548.53 ms. Allocated memory was 151.0 MB in the beginning and 187.7 MB in the end (delta: 36.7 MB). Free memory was 99.8 MB in the beginning and 151.2 MB in the end (delta: -51.3 MB). There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 22:05:08,524 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.01 ms. Allocated memory is still 151.0 MB. Free memory is still 124.9 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 283.02 ms. Allocated memory is still 151.0 MB. Free memory was 126.1 MB in the beginning and 116.7 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 33.95 ms. Allocated memory is still 151.0 MB. Free memory was 116.7 MB in the beginning and 115.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 340.94 ms. Allocated memory is still 151.0 MB. Free memory was 115.2 MB in the beginning and 100.3 MB in the end (delta: 14.9 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 1548.53 ms. Allocated memory was 151.0 MB in the beginning and 187.7 MB in the end (delta: 36.7 MB). Free memory was 99.8 MB in the beginning and 151.2 MB in the end (delta: -51.3 MB). There was no memory consumed. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 5]: 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: [L21] int n, a, s, t; [L22] n = __VERIFIER_nondet_int() [L24] a = 0 [L25] s = 1 [L26] t = 1 [L28] COND TRUE 1 [L29] CALL __VERIFIER_assert(t == 2*a + 1) [L12] COND FALSE !(!(cond)) [L29] RET __VERIFIER_assert(t == 2*a + 1) [L30] CALL __VERIFIER_assert(s == (a + 1) * (a + 1)) [L12] COND TRUE !(cond) [L14] CALL reach_error() [L5] __assert_fail("0", "sqrt1.c", 5, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 52 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNKNOWN, OverallTime: 1.4s, OverallIterations: 3, TraceHistogramMax: 2, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 81 SDtfs, 62 SDslu, 58 SDs, 0 SdLazy, 125 SolverSat, 40 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 17 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=50occurred 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...