/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_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-3af5e1f [2020-09-04 23:11:47,368 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 23:11:47,373 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 23:11:47,421 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-04 23:11:47,421 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-04 23:11:47,423 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-04 23:11:47,425 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-04 23:11:47,429 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-04 23:11:47,434 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-04 23:11:47,435 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-04 23:11:47,437 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-04 23:11:47,441 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-04 23:11:47,441 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 23:11:47,444 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 23:11:47,446 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 23:11:47,449 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 23:11:47,450 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 23:11:47,451 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 23:11:47,456 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 23:11:47,462 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 23:11:47,465 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 23:11:47,466 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 23:11:47,468 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 23:11:47,469 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 23:11:47,474 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-04 23:11:47,474 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-04 23:11:47,474 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-04 23:11:47,477 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-04 23:11:47,478 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-04 23:11:47,480 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-04 23:11:47,480 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-04 23:11:47,481 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-04 23:11:47,482 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-04 23:11:47,482 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-04 23:11:47,484 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-04 23:11:47,484 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-04 23:11:47,485 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-04 23:11:47,485 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-04 23:11:47,485 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 23:11:47,487 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 23:11:47,498 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 23:11:47,504 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 23:11:47,526 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 23:11:47,527 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 23:11:47,529 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 23:11:47,529 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 23:11:47,530 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 23:11:47,530 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 23:11:47,530 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 23:11:47,530 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 23:11:47,530 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 23:11:47,530 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 23:11:47,532 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 23:11:47,532 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 23:11:47,533 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 23:11:47,533 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 23:11:47,533 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 23:11:47,533 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-09-04 23:11:47,533 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 23:11:47,534 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 23:11:47,535 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 23:11:47,535 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 23:11:47,535 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-09-04 23:11:47,536 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 23:11:47,536 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 23:11:47,984 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 23:11:48,000 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 23:11:48,007 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 23:11:48,009 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 23:11:48,011 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 23:11:48,012 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2020-09-04 23:11:48,093 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/1e36e27fb/a459f9eced764090837830a5876f2beb/FLAGdebca4460 [2020-09-04 23:11:48,621 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 23:11:48,621 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2020-09-04 23:11:48,630 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/1e36e27fb/a459f9eced764090837830a5876f2beb/FLAGdebca4460 [2020-09-04 23:11:48,943 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/1e36e27fb/a459f9eced764090837830a5876f2beb [2020-09-04 23:11:48,956 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 23:11:48,959 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 23:11:48,960 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 23:11:48,960 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 23:11:48,965 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 23:11:48,966 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 11:11:48" (1/1) ... [2020-09-04 23:11:48,970 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3dc17a6d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:11:48, skipping insertion in model container [2020-09-04 23:11:48,971 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 11:11:48" (1/1) ... [2020-09-04 23:11:48,980 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 23:11:49,007 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 23:11:49,293 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 23:11:49,299 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 23:11:49,316 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 23:11:49,334 INFO L208 MainTranslator]: Completed translation [2020-09-04 23:11:49,334 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:11:49 WrapperNode [2020-09-04 23:11:49,335 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 23:11:49,336 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 23:11:49,336 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 23:11:49,336 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 23:11:49,351 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:11:49" (1/1) ... [2020-09-04 23:11:49,351 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:11:49" (1/1) ... [2020-09-04 23:11:49,358 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:11:49" (1/1) ... [2020-09-04 23:11:49,358 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:11:49" (1/1) ... [2020-09-04 23:11:49,362 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:11:49" (1/1) ... [2020-09-04 23:11:49,369 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:11:49" (1/1) ... [2020-09-04 23:11:49,370 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:11:49" (1/1) ... [2020-09-04 23:11:49,457 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 23:11:49,457 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 23:11:49,458 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 23:11:49,458 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 23:11:49,459 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:11:49" (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 23:11:49,530 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 23:11:49,531 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 23:11:49,531 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-04 23:11:49,531 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 23:11:49,531 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 23:11:49,531 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-04 23:11:49,531 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 23:11:49,531 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 23:11:49,532 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 23:11:49,732 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 23:11:49,732 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-09-04 23:11:49,737 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 11:11:49 BoogieIcfgContainer [2020-09-04 23:11:49,738 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 23:11:49,739 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 23:11:49,740 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 23:11:49,744 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 23:11:49,744 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 11:11:48" (1/3) ... [2020-09-04 23:11:49,745 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c873397 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 11:11:49, skipping insertion in model container [2020-09-04 23:11:49,745 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:11:49" (2/3) ... [2020-09-04 23:11:49,746 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c873397 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 11:11:49, skipping insertion in model container [2020-09-04 23:11:49,746 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 11:11:49" (3/3) ... [2020-09-04 23:11:49,749 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_2-1.c [2020-09-04 23:11:49,761 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-04 23:11:49,772 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 23:11:49,798 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 23:11:49,839 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 23:11:49,839 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 23:11:49,839 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-04 23:11:49,840 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 23:11:49,840 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 23:11:49,840 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 23:11:49,841 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 23:11:49,841 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 23:11:49,866 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-09-04 23:11:49,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-09-04 23:11:49,883 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:49,884 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:11:49,885 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:49,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:49,894 INFO L82 PathProgramCache]: Analyzing trace with hash 493765703, now seen corresponding path program 1 times [2020-09-04 23:11:49,908 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:49,909 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [806590590] [2020-09-04 23:11:49,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:50,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:50,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:50,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:50,055 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 23:11:50,056 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [806590590] [2020-09-04 23:11:50,058 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 23:11:50,059 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-09-04 23:11:50,060 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405956828] [2020-09-04 23:11:50,066 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-09-04 23:11:50,066 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:50,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-09-04 23:11:50,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-09-04 23:11:50,089 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-09-04 23:11:50,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:50,123 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2020-09-04 23:11:50,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-09-04 23:11:50,125 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2020-09-04 23:11:50,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:50,136 INFO L225 Difference]: With dead ends: 33 [2020-09-04 23:11:50,137 INFO L226 Difference]: Without dead ends: 16 [2020-09-04 23:11:50,142 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 23:11:50,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-09-04 23:11:50,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-09-04 23:11:50,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-09-04 23:11:50,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-09-04 23:11:50,194 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 11 [2020-09-04 23:11:50,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:50,195 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-09-04 23:11:50,195 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-09-04 23:11:50,195 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-09-04 23:11:50,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-09-04 23:11:50,196 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:50,196 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:11:50,197 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 23:11:50,197 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:50,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:50,198 INFO L82 PathProgramCache]: Analyzing trace with hash 486377535, now seen corresponding path program 1 times [2020-09-04 23:11:50,198 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:50,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2059455004] [2020-09-04 23:11:50,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:50,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:50,319 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:50,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:50,324 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 23:11:50,324 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2059455004] [2020-09-04 23:11:50,324 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 23:11:50,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-04 23:11:50,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2111674931] [2020-09-04 23:11:50,327 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-04 23:11:50,327 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:50,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-04 23:11:50,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-04 23:11:50,328 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 3 states. [2020-09-04 23:11:50,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:50,362 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-09-04 23:11:50,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-04 23:11:50,363 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2020-09-04 23:11:50,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:50,364 INFO L225 Difference]: With dead ends: 24 [2020-09-04 23:11:50,364 INFO L226 Difference]: Without dead ends: 19 [2020-09-04 23:11:50,365 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 23:11:50,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-09-04 23:11:50,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2020-09-04 23:11:50,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-09-04 23:11:50,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-09-04 23:11:50,372 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 11 [2020-09-04 23:11:50,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:50,373 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-09-04 23:11:50,373 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-04 23:11:50,373 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-09-04 23:11:50,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-09-04 23:11:50,374 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:50,375 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:11:50,375 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-04 23:11:50,375 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:50,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:50,376 INFO L82 PathProgramCache]: Analyzing trace with hash -1748013841, now seen corresponding path program 1 times [2020-09-04 23:11:50,376 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:50,376 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [947090241] [2020-09-04 23:11:50,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:50,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:50,568 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:50,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:50,575 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 23:11:50,575 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [947090241] [2020-09-04 23:11:50,576 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:50,576 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-04 23:11:50,576 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804959686] [2020-09-04 23:11:50,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-04 23:11:50,577 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:50,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-04 23:11:50,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-09-04 23:11:50,578 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2020-09-04 23:11:50,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:50,679 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-09-04 23:11:50,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-04 23:11:50,680 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-09-04 23:11:50,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:50,681 INFO L225 Difference]: With dead ends: 29 [2020-09-04 23:11:50,681 INFO L226 Difference]: Without dead ends: 24 [2020-09-04 23:11:50,682 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-09-04 23:11:50,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-09-04 23:11:50,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22. [2020-09-04 23:11:50,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-09-04 23:11:50,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-09-04 23:11:50,691 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 16 [2020-09-04 23:11:50,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:50,691 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-09-04 23:11:50,692 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-04 23:11:50,692 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-09-04 23:11:50,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-09-04 23:11:50,693 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:50,693 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:11:50,693 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-04 23:11:50,694 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:50,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:50,694 INFO L82 PathProgramCache]: Analyzing trace with hash 1960900159, now seen corresponding path program 2 times [2020-09-04 23:11:50,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:50,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1563635777] [2020-09-04 23:11:50,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:50,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:50,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:50,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:50,961 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 23:11:50,962 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1563635777] [2020-09-04 23:11:50,962 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:50,962 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-04 23:11:50,963 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219296348] [2020-09-04 23:11:50,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-04 23:11:50,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:50,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-04 23:11:50,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-09-04 23:11:50,967 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 9 states. [2020-09-04 23:11:51,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:51,153 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-09-04 23:11:51,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-04 23:11:51,154 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 21 [2020-09-04 23:11:51,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:51,155 INFO L225 Difference]: With dead ends: 34 [2020-09-04 23:11:51,155 INFO L226 Difference]: Without dead ends: 29 [2020-09-04 23:11:51,158 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2020-09-04 23:11:51,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-09-04 23:11:51,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2020-09-04 23:11:51,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-09-04 23:11:51,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-09-04 23:11:51,178 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 21 [2020-09-04 23:11:51,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:51,178 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-09-04 23:11:51,178 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-04 23:11:51,180 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-09-04 23:11:51,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-09-04 23:11:51,181 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:51,181 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:11:51,181 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-04 23:11:51,182 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:51,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:51,182 INFO L82 PathProgramCache]: Analyzing trace with hash 1793113839, now seen corresponding path program 3 times [2020-09-04 23:11:51,183 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:51,183 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2105299557] [2020-09-04 23:11:51,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:51,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:51,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:51,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:51,425 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 23:11:51,426 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2105299557] [2020-09-04 23:11:51,426 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:51,426 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-04 23:11:51,427 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [695152789] [2020-09-04 23:11:51,427 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-04 23:11:51,428 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:51,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-04 23:11:51,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2020-09-04 23:11:51,428 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 9 states. [2020-09-04 23:11:51,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:51,613 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-09-04 23:11:51,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-04 23:11:51,614 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-09-04 23:11:51,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:51,615 INFO L225 Difference]: With dead ends: 39 [2020-09-04 23:11:51,616 INFO L226 Difference]: Without dead ends: 34 [2020-09-04 23:11:51,616 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 23:11:51,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-09-04 23:11:51,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-09-04 23:11:51,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-09-04 23:11:51,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-09-04 23:11:51,625 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 26 [2020-09-04 23:11:51,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:51,626 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-09-04 23:11:51,626 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-04 23:11:51,626 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-09-04 23:11:51,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-09-04 23:11:51,627 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:51,627 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:11:51,628 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-04 23:11:51,628 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:51,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:51,628 INFO L82 PathProgramCache]: Analyzing trace with hash -774708161, now seen corresponding path program 4 times [2020-09-04 23:11:51,629 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:51,629 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [944911892] [2020-09-04 23:11:51,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:51,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:51,878 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:51,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:51,883 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 23:11:51,884 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [944911892] [2020-09-04 23:11:51,884 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:51,885 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-09-04 23:11:51,885 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713581059] [2020-09-04 23:11:51,885 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-04 23:11:51,886 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:51,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-04 23:11:51,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2020-09-04 23:11:51,887 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 13 states. [2020-09-04 23:11:52,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:52,176 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-09-04 23:11:52,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-04 23:11:52,178 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2020-09-04 23:11:52,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:52,179 INFO L225 Difference]: With dead ends: 44 [2020-09-04 23:11:52,180 INFO L226 Difference]: Without dead ends: 39 [2020-09-04 23:11:52,183 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=67, Invalid=353, Unknown=0, NotChecked=0, Total=420 [2020-09-04 23:11:52,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-09-04 23:11:52,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2020-09-04 23:11:52,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-09-04 23:11:52,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-09-04 23:11:52,202 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 31 [2020-09-04 23:11:52,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:52,203 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-09-04 23:11:52,203 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-04 23:11:52,206 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-09-04 23:11:52,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-09-04 23:11:52,207 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:52,207 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:11:52,209 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-04 23:11:52,209 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:52,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:52,216 INFO L82 PathProgramCache]: Analyzing trace with hash -1644982033, now seen corresponding path program 5 times [2020-09-04 23:11:52,217 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:52,217 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [43695056] [2020-09-04 23:11:52,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:52,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:52,600 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:52,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:52,607 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 23:11:52,608 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [43695056] [2020-09-04 23:11:52,608 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:52,608 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-09-04 23:11:52,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637757890] [2020-09-04 23:11:52,610 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-09-04 23:11:52,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:52,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-09-04 23:11:52,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=178, Unknown=0, NotChecked=0, Total=210 [2020-09-04 23:11:52,612 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 15 states. [2020-09-04 23:11:53,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:53,026 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-09-04 23:11:53,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-09-04 23:11:53,027 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 36 [2020-09-04 23:11:53,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:53,028 INFO L225 Difference]: With dead ends: 49 [2020-09-04 23:11:53,028 INFO L226 Difference]: Without dead ends: 44 [2020-09-04 23:11:53,029 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=82, Invalid=518, Unknown=0, NotChecked=0, Total=600 [2020-09-04 23:11:53,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-09-04 23:11:53,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2020-09-04 23:11:53,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-09-04 23:11:53,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-09-04 23:11:53,038 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 36 [2020-09-04 23:11:53,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:53,039 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-09-04 23:11:53,039 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-09-04 23:11:53,039 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-09-04 23:11:53,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-09-04 23:11:53,040 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:53,040 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:11:53,041 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-04 23:11:53,041 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:53,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:53,041 INFO L82 PathProgramCache]: Analyzing trace with hash 330519103, now seen corresponding path program 6 times [2020-09-04 23:11:53,042 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:53,042 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2050894392] [2020-09-04 23:11:53,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:53,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 23:11:53,058 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 23:11:53,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 23:11:53,073 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 23:11:53,098 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-04 23:11:53,099 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-04 23:11:53,099 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-04 23:11:53,133 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.09 11:11:53 BoogieIcfgContainer [2020-09-04 23:11:53,133 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-04 23:11:53,137 INFO L168 Benchmark]: Toolchain (without parser) took 4176.97 ms. Allocated memory was 145.2 MB in the beginning and 245.9 MB in the end (delta: 100.7 MB). Free memory was 102.2 MB in the beginning and 158.9 MB in the end (delta: -56.7 MB). Peak memory consumption was 44.0 MB. Max. memory is 7.1 GB. [2020-09-04 23:11:53,138 INFO L168 Benchmark]: CDTParser took 0.36 ms. Allocated memory is still 145.2 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-04 23:11:53,138 INFO L168 Benchmark]: CACSL2BoogieTranslator took 375.16 ms. Allocated memory is still 145.2 MB. Free memory was 102.0 MB in the beginning and 92.7 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-09-04 23:11:53,139 INFO L168 Benchmark]: Boogie Preprocessor took 121.44 ms. Allocated memory was 145.2 MB in the beginning and 203.9 MB in the end (delta: 58.7 MB). Free memory was 92.7 MB in the beginning and 184.0 MB in the end (delta: -91.2 MB). Peak memory consumption was 11.0 MB. Max. memory is 7.1 GB. [2020-09-04 23:11:53,140 INFO L168 Benchmark]: RCFGBuilder took 280.62 ms. Allocated memory is still 203.9 MB. Free memory was 184.0 MB in the beginning and 171.4 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 7.1 GB. [2020-09-04 23:11:53,141 INFO L168 Benchmark]: TraceAbstraction took 3393.76 ms. Allocated memory was 203.9 MB in the beginning and 245.9 MB in the end (delta: 41.9 MB). Free memory was 171.4 MB in the beginning and 158.9 MB in the end (delta: 12.5 MB). Peak memory consumption was 54.5 MB. Max. memory is 7.1 GB. [2020-09-04 23:11:53,145 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.36 ms. Allocated memory is still 145.2 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 375.16 ms. Allocated memory is still 145.2 MB. Free memory was 102.0 MB in the beginning and 92.7 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 121.44 ms. Allocated memory was 145.2 MB in the beginning and 203.9 MB in the end (delta: 58.7 MB). Free memory was 92.7 MB in the beginning and 184.0 MB in the end (delta: -91.2 MB). Peak memory consumption was 11.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 280.62 ms. Allocated memory is still 203.9 MB. Free memory was 184.0 MB in the beginning and 171.4 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3393.76 ms. Allocated memory was 203.9 MB in the beginning and 245.9 MB in the end (delta: 41.9 MB). Free memory was 171.4 MB in the beginning and 158.9 MB in the end (delta: 12.5 MB). Peak memory consumption was 54.5 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(x != 6) 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: 3.2s, OverallIterations: 8, TraceHistogramMax: 6, AutomataDifference: 1.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 117 SDtfs, 53 SDslu, 539 SDs, 0 SdLazy, 497 SolverSat, 30 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 106 GetRequests, 28 SyntacticMatches, 4 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 1.3s 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, 12 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.3s InterpolantComputationTime, 193 NumberOfCodeBlocks, 193 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 145 ConstructedInterpolants, 0 QuantifiedInterpolants, 20045 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...