/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 --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-3af5e1f [2020-09-04 23:11:43,506 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 23:11:43,509 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 23:11:43,535 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-04 23:11:43,536 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-04 23:11:43,537 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-04 23:11:43,538 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-04 23:11:43,540 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-04 23:11:43,541 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-04 23:11:43,542 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-04 23:11:43,543 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-04 23:11:43,544 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-04 23:11:43,545 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 23:11:43,546 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 23:11:43,547 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 23:11:43,548 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 23:11:43,549 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 23:11:43,550 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 23:11:43,552 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 23:11:43,554 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 23:11:43,555 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 23:11:43,557 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 23:11:43,558 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 23:11:43,559 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 23:11:43,561 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-04 23:11:43,562 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-04 23:11:43,562 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-04 23:11:43,563 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-04 23:11:43,563 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-04 23:11:43,565 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-04 23:11:43,565 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-04 23:11:43,566 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-04 23:11:43,566 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-04 23:11:43,567 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-04 23:11:43,568 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-04 23:11:43,569 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-04 23:11:43,569 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-04 23:11:43,570 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-04 23:11:43,570 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 23:11:43,571 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 23:11:43,572 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 23:11:43,573 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 23:11:43,584 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 23:11:43,585 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 23:11:43,586 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 23:11:43,586 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 23:11:43,587 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 23:11:43,587 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 23:11:43,587 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 23:11:43,587 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 23:11:43,587 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 23:11:43,587 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 23:11:43,588 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 23:11:43,588 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 23:11:43,588 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 23:11:43,588 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 23:11:43,588 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 23:11:43,589 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-09-04 23:11:43,589 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 23:11:43,589 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 23:11:43,589 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 23:11:43,590 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 23:11:43,590 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-09-04 23:11:43,590 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 23:11:43,590 INFO L138 SettingsManager]: * Use separate solver for trace checks=false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-09-04 23:11:44,016 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 23:11:44,033 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 23:11:44,037 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 23:11:44,039 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 23:11:44,040 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 23:11:44,041 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2020-09-04 23:11:44,117 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d17f71711/4286abc7824e460db32be47061c662dc/FLAGe45987caa [2020-09-04 23:11:44,638 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 23:11:44,639 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2020-09-04 23:11:44,647 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d17f71711/4286abc7824e460db32be47061c662dc/FLAGe45987caa [2020-09-04 23:11:44,978 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d17f71711/4286abc7824e460db32be47061c662dc [2020-09-04 23:11:44,990 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 23:11:44,992 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 23:11:44,993 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 23:11:44,993 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 23:11:44,998 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 23:11:45,000 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 11:11:44" (1/1) ... [2020-09-04 23:11:45,004 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4df7be5c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:11:45, skipping insertion in model container [2020-09-04 23:11:45,005 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 11:11:44" (1/1) ... [2020-09-04 23:11:45,016 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 23:11:45,040 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 23:11:45,238 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 23:11:45,243 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 23:11:45,259 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 23:11:45,275 INFO L208 MainTranslator]: Completed translation [2020-09-04 23:11:45,276 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:11:45 WrapperNode [2020-09-04 23:11:45,276 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 23:11:45,277 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 23:11:45,277 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 23:11:45,277 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 23:11:45,289 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:11:45" (1/1) ... [2020-09-04 23:11:45,290 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:11:45" (1/1) ... [2020-09-04 23:11:45,294 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:11:45" (1/1) ... [2020-09-04 23:11:45,295 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:11:45" (1/1) ... [2020-09-04 23:11:45,298 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:11:45" (1/1) ... [2020-09-04 23:11:45,304 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:11:45" (1/1) ... [2020-09-04 23:11:45,305 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:11:45" (1/1) ... [2020-09-04 23:11:45,377 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 23:11:45,377 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 23:11:45,378 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 23:11:45,378 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 23:11:45,379 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:11:45" (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 23:11:45,465 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 23:11:45,466 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 23:11:45,466 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-04 23:11:45,466 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 23:11:45,466 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 23:11:45,466 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-04 23:11:45,466 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 23:11:45,467 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 23:11:45,467 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 23:11:45,659 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 23:11:45,659 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-09-04 23:11:45,664 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 11:11:45 BoogieIcfgContainer [2020-09-04 23:11:45,664 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 23:11:45,666 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 23:11:45,666 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 23:11:45,669 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 23:11:45,670 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 11:11:44" (1/3) ... [2020-09-04 23:11:45,671 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b980796 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 11:11:45, skipping insertion in model container [2020-09-04 23:11:45,671 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:11:45" (2/3) ... [2020-09-04 23:11:45,672 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b980796 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 11:11:45, skipping insertion in model container [2020-09-04 23:11:45,672 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 11:11:45" (3/3) ... [2020-09-04 23:11:45,674 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_1-1.c [2020-09-04 23:11:45,686 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-04 23:11:45,695 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 23:11:45,731 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 23:11:45,787 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 23:11:45,787 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 23:11:45,788 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-04 23:11:45,788 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 23:11:45,788 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 23:11:45,800 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 23:11:45,800 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 23:11:45,800 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 23:11:45,830 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-09-04 23:11:45,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-09-04 23:11:45,841 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:45,843 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:11:45,843 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:45,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:45,850 INFO L82 PathProgramCache]: Analyzing trace with hash 493765703, now seen corresponding path program 1 times [2020-09-04 23:11:45,859 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:45,860 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1917785502] [2020-09-04 23:11:45,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:45,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:45,979 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:45,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:45,986 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 23:11:45,987 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1917785502] [2020-09-04 23:11:45,989 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 23:11:45,990 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-09-04 23:11:45,990 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930261743] [2020-09-04 23:11:45,996 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-09-04 23:11:45,996 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:46,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-09-04 23:11:46,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-09-04 23:11:46,017 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-09-04 23:11:46,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:46,047 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2020-09-04 23:11:46,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-09-04 23:11:46,049 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2020-09-04 23:11:46,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:46,060 INFO L225 Difference]: With dead ends: 33 [2020-09-04 23:11:46,060 INFO L226 Difference]: Without dead ends: 16 [2020-09-04 23:11:46,065 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 23:11:46,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-09-04 23:11:46,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-09-04 23:11:46,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-09-04 23:11:46,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-09-04 23:11:46,111 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 11 [2020-09-04 23:11:46,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:46,112 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-09-04 23:11:46,112 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-09-04 23:11:46,112 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-09-04 23:11:46,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-09-04 23:11:46,113 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:46,113 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:11:46,114 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 23:11:46,114 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:46,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:46,114 INFO L82 PathProgramCache]: Analyzing trace with hash 486377535, now seen corresponding path program 1 times [2020-09-04 23:11:46,115 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:46,115 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1079676426] [2020-09-04 23:11:46,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:46,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:46,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:46,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:46,233 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 23:11:46,233 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1079676426] [2020-09-04 23:11:46,233 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 23:11:46,234 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-04 23:11:46,234 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580793891] [2020-09-04 23:11:46,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-04 23:11:46,236 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:46,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-04 23:11:46,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-04 23:11:46,237 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 3 states. [2020-09-04 23:11:46,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:46,265 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-09-04 23:11:46,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-04 23:11:46,266 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2020-09-04 23:11:46,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:46,267 INFO L225 Difference]: With dead ends: 24 [2020-09-04 23:11:46,267 INFO L226 Difference]: Without dead ends: 19 [2020-09-04 23:11:46,268 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-04 23:11:46,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-09-04 23:11:46,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2020-09-04 23:11:46,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-09-04 23:11:46,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-09-04 23:11:46,276 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 11 [2020-09-04 23:11:46,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:46,276 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-09-04 23:11:46,276 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-04 23:11:46,277 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-09-04 23:11:46,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-09-04 23:11:46,278 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:46,278 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:11:46,278 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-04 23:11:46,278 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:46,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:46,279 INFO L82 PathProgramCache]: Analyzing trace with hash -1748013841, now seen corresponding path program 1 times [2020-09-04 23:11:46,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:46,280 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [204988315] [2020-09-04 23:11:46,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:46,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:46,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:46,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:46,429 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:11:46,429 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [204988315] [2020-09-04 23:11:46,430 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:46,430 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-09-04 23:11:46,430 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911791737] [2020-09-04 23:11:46,431 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-04 23:11:46,431 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:46,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-04 23:11:46,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-09-04 23:11:46,432 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 6 states. [2020-09-04 23:11:46,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:46,480 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-09-04 23:11:46,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-04 23:11:46,481 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-09-04 23:11:46,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:46,482 INFO L225 Difference]: With dead ends: 31 [2020-09-04 23:11:46,483 INFO L226 Difference]: Without dead ends: 26 [2020-09-04 23:11:46,483 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-09-04 23:11:46,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-09-04 23:11:46,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 22. [2020-09-04 23:11:46,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-09-04 23:11:46,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-09-04 23:11:46,492 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 16 [2020-09-04 23:11:46,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:46,492 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-09-04 23:11:46,492 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-04 23:11:46,492 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-09-04 23:11:46,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-09-04 23:11:46,493 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:46,494 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:11:46,494 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-04 23:11:46,494 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:46,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:46,495 INFO L82 PathProgramCache]: Analyzing trace with hash 1960900159, now seen corresponding path program 2 times [2020-09-04 23:11:46,495 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:46,495 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [260296730] [2020-09-04 23:11:46,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:46,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:46,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:46,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:46,644 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:11:46,644 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [260296730] [2020-09-04 23:11:46,645 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:46,646 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-04 23:11:46,646 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235390605] [2020-09-04 23:11:46,647 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-04 23:11:46,647 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:46,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-04 23:11:46,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-09-04 23:11:46,648 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 7 states. [2020-09-04 23:11:46,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:46,701 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-09-04 23:11:46,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-04 23:11:46,702 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-09-04 23:11:46,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:46,703 INFO L225 Difference]: With dead ends: 36 [2020-09-04 23:11:46,703 INFO L226 Difference]: Without dead ends: 31 [2020-09-04 23:11:46,704 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-09-04 23:11:46,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-09-04 23:11:46,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 27. [2020-09-04 23:11:46,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-09-04 23:11:46,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-09-04 23:11:46,713 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 21 [2020-09-04 23:11:46,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:46,713 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-09-04 23:11:46,713 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-04 23:11:46,713 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-09-04 23:11:46,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-09-04 23:11:46,714 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:46,714 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:11:46,715 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-04 23:11:46,715 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:46,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:46,715 INFO L82 PathProgramCache]: Analyzing trace with hash 1793113839, now seen corresponding path program 3 times [2020-09-04 23:11:46,716 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:46,716 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [57437426] [2020-09-04 23:11:46,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:46,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:46,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:46,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:46,882 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:11:46,882 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [57437426] [2020-09-04 23:11:46,883 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:46,883 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-04 23:11:46,883 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782326492] [2020-09-04 23:11:46,884 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-04 23:11:46,884 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:46,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-04 23:11:46,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2020-09-04 23:11:46,885 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 9 states. [2020-09-04 23:11:47,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:47,105 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-09-04 23:11:47,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-04 23:11:47,105 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-09-04 23:11:47,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:47,107 INFO L225 Difference]: With dead ends: 39 [2020-09-04 23:11:47,107 INFO L226 Difference]: Without dead ends: 34 [2020-09-04 23:11:47,107 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2020-09-04 23:11:47,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-09-04 23:11:47,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-09-04 23:11:47,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-09-04 23:11:47,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-09-04 23:11:47,116 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 26 [2020-09-04 23:11:47,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:47,116 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-09-04 23:11:47,117 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-04 23:11:47,117 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-09-04 23:11:47,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-09-04 23:11:47,118 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:47,118 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:11:47,118 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-04 23:11:47,119 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:47,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:47,119 INFO L82 PathProgramCache]: Analyzing trace with hash -774708161, now seen corresponding path program 4 times [2020-09-04 23:11:47,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:47,120 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1245889466] [2020-09-04 23:11:47,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:47,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:47,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:47,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:47,299 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:11:47,299 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1245889466] [2020-09-04 23:11:47,299 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:47,299 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-09-04 23:11:47,300 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1821499267] [2020-09-04 23:11:47,300 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-09-04 23:11:47,300 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:47,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-09-04 23:11:47,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2020-09-04 23:11:47,301 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 11 states. [2020-09-04 23:11:47,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:47,529 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-09-04 23:11:47,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-04 23:11:47,530 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 31 [2020-09-04 23:11:47,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:47,531 INFO L225 Difference]: With dead ends: 44 [2020-09-04 23:11:47,531 INFO L226 Difference]: Without dead ends: 39 [2020-09-04 23:11:47,532 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=279, Unknown=0, NotChecked=0, Total=342 [2020-09-04 23:11:47,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-09-04 23:11:47,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2020-09-04 23:11:47,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-09-04 23:11:47,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-09-04 23:11:47,541 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 31 [2020-09-04 23:11:47,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:47,541 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-09-04 23:11:47,541 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-09-04 23:11:47,542 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-09-04 23:11:47,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-09-04 23:11:47,543 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:47,543 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:11:47,543 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-04 23:11:47,543 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:47,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:47,544 INFO L82 PathProgramCache]: Analyzing trace with hash -1644982033, now seen corresponding path program 5 times [2020-09-04 23:11:47,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:47,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1417025170] [2020-09-04 23:11:47,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:47,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:47,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:47,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:47,764 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:11:47,765 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1417025170] [2020-09-04 23:11:47,765 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:47,766 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-09-04 23:11:47,766 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057543968] [2020-09-04 23:11:47,766 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-04 23:11:47,767 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:47,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-04 23:11:47,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-09-04 23:11:47,768 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 13 states. [2020-09-04 23:11:48,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:48,100 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-09-04 23:11:48,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-09-04 23:11:48,100 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-09-04 23:11:48,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:48,101 INFO L225 Difference]: With dead ends: 49 [2020-09-04 23:11:48,101 INFO L226 Difference]: Without dead ends: 44 [2020-09-04 23:11:48,102 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=428, Unknown=0, NotChecked=0, Total=506 [2020-09-04 23:11:48,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-09-04 23:11:48,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2020-09-04 23:11:48,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-09-04 23:11:48,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-09-04 23:11:48,111 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 36 [2020-09-04 23:11:48,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:48,111 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-09-04 23:11:48,111 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-04 23:11:48,111 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-09-04 23:11:48,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-09-04 23:11:48,113 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:48,113 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:11:48,113 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-04 23:11:48,113 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:48,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:48,114 INFO L82 PathProgramCache]: Analyzing trace with hash 330519103, now seen corresponding path program 6 times [2020-09-04 23:11:48,114 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:48,114 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1177517038] [2020-09-04 23:11:48,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:48,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 23:11:48,135 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 23:11:48,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 23:11:48,155 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 23:11:48,180 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-04 23:11:48,181 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-04 23:11:48,181 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-04 23:11:48,215 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.09 11:11:48 BoogieIcfgContainer [2020-09-04 23:11:48,215 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-04 23:11:48,219 INFO L168 Benchmark]: Toolchain (without parser) took 3225.89 ms. Allocated memory was 139.5 MB in the beginning and 245.4 MB in the end (delta: 105.9 MB). Free memory was 103.1 MB in the beginning and 198.2 MB in the end (delta: -95.0 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. [2020-09-04 23:11:48,220 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 139.5 MB. Free memory was 120.8 MB in the beginning and 120.6 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-09-04 23:11:48,221 INFO L168 Benchmark]: CACSL2BoogieTranslator took 283.03 ms. Allocated memory is still 139.5 MB. Free memory was 102.9 MB in the beginning and 93.6 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-09-04 23:11:48,222 INFO L168 Benchmark]: Boogie Preprocessor took 100.52 ms. Allocated memory was 139.5 MB in the beginning and 202.9 MB in the end (delta: 63.4 MB). Free memory was 93.6 MB in the beginning and 182.9 MB in the end (delta: -89.4 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. [2020-09-04 23:11:48,222 INFO L168 Benchmark]: RCFGBuilder took 287.02 ms. Allocated memory is still 202.9 MB. Free memory was 182.9 MB in the beginning and 170.6 MB in the end (delta: 12.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. [2020-09-04 23:11:48,223 INFO L168 Benchmark]: TraceAbstraction took 2549.82 ms. Allocated memory was 202.9 MB in the beginning and 245.4 MB in the end (delta: 42.5 MB). Free memory was 170.6 MB in the beginning and 198.2 MB in the end (delta: -27.5 MB). Peak memory consumption was 14.9 MB. Max. memory is 7.1 GB. [2020-09-04 23:11:48,227 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 139.5 MB. Free memory was 120.8 MB in the beginning and 120.6 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 283.03 ms. Allocated memory is still 139.5 MB. Free memory was 102.9 MB in the beginning and 93.6 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 100.52 ms. Allocated memory was 139.5 MB in the beginning and 202.9 MB in the end (delta: 63.4 MB). Free memory was 93.6 MB in the beginning and 182.9 MB in the end (delta: -89.4 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 287.02 ms. Allocated memory is still 202.9 MB. Free memory was 182.9 MB in the beginning and 170.6 MB in the end (delta: 12.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2549.82 ms. Allocated memory was 202.9 MB in the beginning and 245.4 MB in the end (delta: 42.5 MB). Free memory was 170.6 MB in the beginning and 198.2 MB in the end (delta: -27.5 MB). Peak memory consumption was 14.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L11] unsigned int x = 0; VAL [x=0] [L12] unsigned int y = 1; VAL [x=0, y=1] [L14] COND TRUE x < 6 VAL [x=0, y=1] [L15] x++ VAL [x=1, y=1] [L16] y *= 2 VAL [x=1, y=2] [L14] COND TRUE x < 6 VAL [x=1, y=2] [L15] x++ VAL [x=2, y=2] [L16] y *= 2 VAL [x=2, y=4] [L14] COND TRUE x < 6 VAL [x=2, y=4] [L15] x++ VAL [x=3, y=4] [L16] y *= 2 VAL [x=3, y=8] [L14] COND TRUE x < 6 VAL [x=3, y=8] [L15] x++ VAL [x=4, y=8] [L16] y *= 2 VAL [x=4, y=16] [L14] COND TRUE x < 6 VAL [x=4, y=16] [L15] x++ VAL [x=5, y=16] [L16] y *= 2 VAL [x=5, y=32] [L14] COND TRUE x < 6 VAL [x=5, y=32] [L15] x++ VAL [x=6, y=32] [L16] y *= 2 VAL [x=6, y=64] [L14] COND FALSE !(x < 6) VAL [x=6, y=64] [L19] CALL __VERIFIER_assert(y != 64) VAL [\old(cond)=0] [L4] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L5] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 22 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.4s, OverallIterations: 8, TraceHistogramMax: 6, AutomataDifference: 0.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 122 SDtfs, 62 SDslu, 454 SDs, 0 SdLazy, 392 SolverSat, 27 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 91 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=42occurred in iteration=7, 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, 7 MinimizatonAttempts, 16 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.8s InterpolantComputationTime, 193 NumberOfCodeBlocks, 193 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 145 ConstructedInterpolants, 0 QuantifiedInterpolants, 19515 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 7 InterpolantComputations, 2 PerfectInterpolantSequences, 0/115 InterpolantCoveringCapability, 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 proved your program to be incorrect! Received shutdown request...