/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 0.1.25-72570d3 [2020-08-22 19:50:48,318 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 19:50:48,320 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 19:50:48,350 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 19:50:48,350 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 19:50:48,358 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 19:50:48,360 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 19:50:48,364 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 19:50:48,365 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 19:50:48,367 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 19:50:48,368 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 19:50:48,369 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 19:50:48,370 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 19:50:48,373 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 19:50:48,375 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 19:50:48,376 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 19:50:48,378 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 19:50:48,380 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 19:50:48,382 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 19:50:48,390 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 19:50:48,392 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 19:50:48,393 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 19:50:48,394 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 19:50:48,394 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 19:50:48,406 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-22 19:50:48,406 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-22 19:50:48,406 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-22 19:50:48,407 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-22 19:50:48,413 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-22 19:50:48,414 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-22 19:50:48,414 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-22 19:50:48,415 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-22 19:50:48,416 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-22 19:50:48,420 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-22 19:50:48,420 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-22 19:50:48,421 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-22 19:50:48,421 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-22 19:50:48,421 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-22 19:50:48,424 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 19:50:48,425 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 19:50:48,426 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 19:50:48,426 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-08-22 19:50:48,441 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 19:50:48,441 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 19:50:48,443 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 19:50:48,443 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 19:50:48,443 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 19:50:48,443 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 19:50:48,444 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 19:50:48,444 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 19:50:48,444 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 19:50:48,445 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 19:50:48,445 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 19:50:48,446 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 19:50:48,446 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 19:50:48,446 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 19:50:48,446 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 19:50:48,447 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-08-22 19:50:48,447 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 19:50:48,447 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 19:50:48,447 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 19:50:48,447 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 19:50:48,448 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-08-22 19:50:48,448 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 19:50:48,448 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-08-22 19:50:48,768 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 19:50:48,779 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 19:50:48,783 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 19:50:48,784 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 19:50:48,787 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 19:50:48,787 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/sqrt1.c [2020-08-22 19:50:48,846 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bb944eb38/6a9ba2781b104243b16d4c16728ef85f/FLAG24c7549c6 [2020-08-22 19:50:49,283 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 19:50:49,284 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/sqrt1.c [2020-08-22 19:50:49,291 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bb944eb38/6a9ba2781b104243b16d4c16728ef85f/FLAG24c7549c6 [2020-08-22 19:50:49,631 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bb944eb38/6a9ba2781b104243b16d4c16728ef85f [2020-08-22 19:50:49,641 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 19:50:49,643 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 19:50:49,645 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 19:50:49,645 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 19:50:49,648 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 19:50:49,649 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 07:50:49" (1/1) ... [2020-08-22 19:50:49,653 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@19c9ac3c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:50:49, skipping insertion in model container [2020-08-22 19:50:49,653 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 07:50:49" (1/1) ... [2020-08-22 19:50:49,661 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 19:50:49,679 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 19:50:49,851 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 19:50:49,855 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 19:50:49,875 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 19:50:49,890 INFO L208 MainTranslator]: Completed translation [2020-08-22 19:50:49,891 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:50:49 WrapperNode [2020-08-22 19:50:49,891 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 19:50:49,892 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 19:50:49,892 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 19:50:49,892 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 19:50:49,905 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:50:49" (1/1) ... [2020-08-22 19:50:49,905 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:50:49" (1/1) ... [2020-08-22 19:50:49,993 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:50:49" (1/1) ... [2020-08-22 19:50:49,998 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:50:49" (1/1) ... [2020-08-22 19:50:50,002 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:50:49" (1/1) ... [2020-08-22 19:50:50,008 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:50:49" (1/1) ... [2020-08-22 19:50:50,013 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:50:49" (1/1) ... [2020-08-22 19:50:50,022 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 19:50:50,022 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 19:50:50,022 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 19:50:50,023 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 19:50:50,023 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:50:49" (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 [2020-08-22 19:50:50,082 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 19:50:50,082 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 19:50:50,082 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-22 19:50:50,082 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 19:50:50,083 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 19:50:50,083 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 19:50:50,083 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-22 19:50:50,083 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-22 19:50:50,083 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-22 19:50:50,083 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 19:50:50,083 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 19:50:50,084 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 19:50:50,084 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 19:50:50,301 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 19:50:50,302 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-22 19:50:50,306 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 07:50:50 BoogieIcfgContainer [2020-08-22 19:50:50,307 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 19:50:50,308 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 19:50:50,308 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 19:50:50,312 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 19:50:50,312 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 07:50:49" (1/3) ... [2020-08-22 19:50:50,313 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e97052e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 07:50:50, skipping insertion in model container [2020-08-22 19:50:50,313 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:50:49" (2/3) ... [2020-08-22 19:50:50,313 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e97052e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 07:50:50, skipping insertion in model container [2020-08-22 19:50:50,314 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 07:50:50" (3/3) ... [2020-08-22 19:50:50,315 INFO L109 eAbstractionObserver]: Analyzing ICFG sqrt1.c [2020-08-22 19:50:50,328 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 19:50:50,349 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 19:50:50,388 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 19:50:50,414 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 19:50:50,414 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 19:50:50,414 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-08-22 19:50:50,414 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 19:50:50,415 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 19:50:50,415 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 19:50:50,415 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 19:50:50,415 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 19:50:50,432 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states. [2020-08-22 19:50:50,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-22 19:50:50,455 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 19:50:50,456 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 19:50:50,456 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 19:50:50,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 19:50:50,465 INFO L82 PathProgramCache]: Analyzing trace with hash 37246768, now seen corresponding path program 1 times [2020-08-22 19:50:50,471 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 19:50:50,472 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1581787512] [2020-08-22 19:50:50,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 19:50:50,533 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 19:50:50,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:50:50,598 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 19:50:50,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:50:50,606 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 19:50:50,608 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1581787512] [2020-08-22 19:50:50,611 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 19:50:50,611 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-22 19:50:50,612 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13391421] [2020-08-22 19:50:50,617 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-22 19:50:50,617 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 19:50:50,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-22 19:50:50,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-22 19:50:50,633 INFO L87 Difference]: Start difference. First operand 36 states. Second operand 2 states. [2020-08-22 19:50:50,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 19:50:50,660 INFO L93 Difference]: Finished difference Result 58 states and 80 transitions. [2020-08-22 19:50:50,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-22 19:50:50,662 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 19 [2020-08-22 19:50:50,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 19:50:50,671 INFO L225 Difference]: With dead ends: 58 [2020-08-22 19:50:50,672 INFO L226 Difference]: Without dead ends: 31 [2020-08-22 19:50:50,676 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 [2020-08-22 19:50:50,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-22 19:50:50,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-22 19:50:50,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-22 19:50:50,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2020-08-22 19:50:50,719 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 19 [2020-08-22 19:50:50,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 19:50:50,720 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2020-08-22 19:50:50,720 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-22 19:50:50,720 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2020-08-22 19:50:50,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-22 19:50:50,721 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 19:50:50,722 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 19:50:50,722 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 19:50:50,722 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 19:50:50,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 19:50:50,723 INFO L82 PathProgramCache]: Analyzing trace with hash 25062249, now seen corresponding path program 1 times [2020-08-22 19:50:50,723 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 19:50:50,724 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1990820994] [2020-08-22 19:50:50,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 19:50:50,726 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 19:50:50,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:50:50,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 19:50:50,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:50:50,890 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 19:50:50,890 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1990820994] [2020-08-22 19:50:50,891 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 19:50:50,891 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-22 19:50:50,891 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607787054] [2020-08-22 19:50:50,892 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 19:50:50,893 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 19:50:50,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 19:50:50,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-22 19:50:50,894 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand 6 states. [2020-08-22 19:50:51,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 19:50:51,050 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2020-08-22 19:50:51,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 19:50:51,051 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-22 19:50:51,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 19:50:51,053 INFO L225 Difference]: With dead ends: 46 [2020-08-22 19:50:51,053 INFO L226 Difference]: Without dead ends: 44 [2020-08-22 19:50:51,055 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 [2020-08-22 19:50:51,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-22 19:50:51,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 41. [2020-08-22 19:50:51,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-22 19:50:51,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 50 transitions. [2020-08-22 19:50:51,076 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 50 transitions. Word has length 19 [2020-08-22 19:50:51,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 19:50:51,077 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 50 transitions. [2020-08-22 19:50:51,077 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 19:50:51,077 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 50 transitions. [2020-08-22 19:50:51,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-22 19:50:51,078 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 19:50:51,079 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] [2020-08-22 19:50:51,079 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 19:50:51,079 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 19:50:51,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 19:50:51,080 INFO L82 PathProgramCache]: Analyzing trace with hash -1680832565, now seen corresponding path program 1 times [2020-08-22 19:50:51,080 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 19:50:51,081 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [170212086] [2020-08-22 19:50:51,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 19:50:51,083 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 19:50:51,092 WARN L168 FreeRefinementEngine]: Strategy FIXED_PREFERENCES was unsuccessful and could not determine trace feasibility [2020-08-22 19:50:51,093 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 19:50:51,099 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 19:50:51,113 WARN L231 ceAbstractionStarter]: Unable to decide correctness. Please check the following counterexample manually. [2020-08-22 19:50:51,113 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 07:50:51 BoogieIcfgContainer [2020-08-22 19:50:51,114 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 19:50:51,116 INFO L168 Benchmark]: Toolchain (without parser) took 1472.52 ms. Allocated memory was 139.5 MB in the beginning and 203.9 MB in the end (delta: 64.5 MB). Free memory was 104.0 MB in the beginning and 123.5 MB in the end (delta: -19.6 MB). Peak memory consumption was 44.9 MB. Max. memory is 7.1 GB. [2020-08-22 19:50:51,117 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 139.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-08-22 19:50:51,119 INFO L168 Benchmark]: CACSL2BoogieTranslator took 246.83 ms. Allocated memory is still 139.5 MB. Free memory was 103.7 MB in the beginning and 94.1 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. [2020-08-22 19:50:51,120 INFO L168 Benchmark]: Boogie Preprocessor took 130.34 ms. Allocated memory was 139.5 MB in the beginning and 203.9 MB in the end (delta: 64.5 MB). Free memory was 94.1 MB in the beginning and 182.6 MB in the end (delta: -88.6 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. [2020-08-22 19:50:51,121 INFO L168 Benchmark]: RCFGBuilder took 284.35 ms. Allocated memory is still 203.9 MB. Free memory was 182.0 MB in the beginning and 168.8 MB in the end (delta: 13.2 MB). Peak memory consumption was 13.2 MB. Max. memory is 7.1 GB. [2020-08-22 19:50:51,122 INFO L168 Benchmark]: TraceAbstraction took 805.74 ms. Allocated memory is still 203.9 MB. Free memory was 168.1 MB in the beginning and 123.5 MB in the end (delta: 44.6 MB). Peak memory consumption was 44.6 MB. Max. memory is 7.1 GB. [2020-08-22 19:50:51,126 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 139.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 246.83 ms. Allocated memory is still 139.5 MB. Free memory was 103.7 MB in the beginning and 94.1 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 130.34 ms. Allocated memory was 139.5 MB in the beginning and 203.9 MB in the end (delta: 64.5 MB). Free memory was 94.1 MB in the beginning and 182.6 MB in the end (delta: -88.6 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 284.35 ms. Allocated memory is still 203.9 MB. Free memory was 182.0 MB in the beginning and 168.8 MB in the end (delta: 13.2 MB). Peak memory consumption was 13.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 805.74 ms. Allocated memory is still 203.9 MB. Free memory was 168.1 MB in the beginning and 123.5 MB in the end (delta: 44.6 MB). Peak memory consumption was 44.6 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: 0.6s, OverallIterations: 3, TraceHistogramMax: 2, AutomataDifference: 0.2s, 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, 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...