/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --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/recursive-simple/id2_i5_o5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-24 00:54:30,213 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-24 00:54:30,216 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-24 00:54:30,256 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-10-24 00:54:30,269 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-24 00:54:30,270 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-24 00:54:30,271 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-24 00:54:30,273 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-24 00:54:30,274 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-24 00:54:30,275 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-24 00:54:30,290 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-24 00:54:30,300 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-24 00:54:30,305 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-24 00:54:30,308 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-24 00:54:30,310 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-24 00:54:30,311 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-24 00:54:30,317 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-10-24 00:54:30,339 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-10-24 00:54:30,362 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-24 00:54:30,362 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-24 00:54:30,367 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-24 00:54:30,367 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-24 00:54:30,368 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-24 00:54:30,368 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-24 00:54:30,368 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-24 00:54:30,368 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-24 00:54:30,368 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-24 00:54:30,369 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-24 00:54:30,370 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-24 00:54:30,370 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-24 00:54:30,370 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-24 00:54:30,370 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-24 00:54:30,371 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-24 00:54:30,372 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-10-24 00:54:30,372 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-24 00:54:30,372 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-24 00:54:30,372 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-24 00:54:30,372 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-24 00:54:30,373 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-10-24 00:54:30,373 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-24 00:54:30,373 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-10-24 00:54:30,814 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-24 00:54:30,865 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-24 00:54:30,870 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-24 00:54:30,872 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-24 00:54:30,872 INFO L275 PluginConnector]: CDTParser initialized [2020-10-24 00:54:30,874 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c [2020-10-24 00:54:30,962 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/96b43385f/475eaf00a5a44154aa1e35bdc92ab9a1/FLAG47a480318 [2020-10-24 00:54:31,687 INFO L306 CDTParser]: Found 1 translation units. [2020-10-24 00:54:31,688 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c [2020-10-24 00:54:31,698 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/96b43385f/475eaf00a5a44154aa1e35bdc92ab9a1/FLAG47a480318 [2020-10-24 00:54:32,031 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/96b43385f/475eaf00a5a44154aa1e35bdc92ab9a1 [2020-10-24 00:54:32,035 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-24 00:54:32,043 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-24 00:54:32,045 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-24 00:54:32,046 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-24 00:54:32,050 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-24 00:54:32,051 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:54:32" (1/1) ... [2020-10-24 00:54:32,054 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@95ec354 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:54:32, skipping insertion in model container [2020-10-24 00:54:32,055 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:54:32" (1/1) ... [2020-10-24 00:54:32,064 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-24 00:54:32,078 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-24 00:54:32,251 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-24 00:54:32,266 INFO L203 MainTranslator]: Completed pre-run [2020-10-24 00:54:32,286 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-24 00:54:32,305 INFO L208 MainTranslator]: Completed translation [2020-10-24 00:54:32,306 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:54:32 WrapperNode [2020-10-24 00:54:32,307 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-24 00:54:32,308 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-24 00:54:32,309 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-24 00:54:32,309 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-24 00:54:32,322 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:54:32" (1/1) ... [2020-10-24 00:54:32,323 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:54:32" (1/1) ... [2020-10-24 00:54:32,330 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:54:32" (1/1) ... [2020-10-24 00:54:32,331 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:54:32" (1/1) ... [2020-10-24 00:54:32,336 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:54:32" (1/1) ... [2020-10-24 00:54:32,338 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:54:32" (1/1) ... [2020-10-24 00:54:32,340 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:54:32" (1/1) ... [2020-10-24 00:54:32,342 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-24 00:54:32,343 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-24 00:54:32,343 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-24 00:54:32,344 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-24 00:54:32,345 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:54:32" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-24 00:54:32,438 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-24 00:54:32,438 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-24 00:54:32,439 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-24 00:54:32,439 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-10-24 00:54:32,439 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-10-24 00:54:32,439 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-24 00:54:32,439 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-24 00:54:32,440 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-24 00:54:32,440 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-24 00:54:32,440 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-24 00:54:32,440 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-24 00:54:32,440 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-10-24 00:54:32,440 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-10-24 00:54:32,441 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-24 00:54:32,441 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-24 00:54:32,441 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-24 00:54:32,441 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-24 00:54:32,441 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-24 00:54:32,441 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-24 00:54:32,442 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-24 00:54:32,850 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-24 00:54:32,850 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-10-24 00:54:32,853 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:54:32 BoogieIcfgContainer [2020-10-24 00:54:32,854 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-24 00:54:32,856 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-24 00:54:32,857 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-24 00:54:32,862 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-24 00:54:32,862 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:54:32" (1/3) ... [2020-10-24 00:54:32,877 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7bc92976 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:54:32, skipping insertion in model container [2020-10-24 00:54:32,878 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:54:32" (2/3) ... [2020-10-24 00:54:32,878 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7bc92976 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:54:32, skipping insertion in model container [2020-10-24 00:54:32,879 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:54:32" (3/3) ... [2020-10-24 00:54:32,883 INFO L111 eAbstractionObserver]: Analyzing ICFG id2_i5_o5-1.c [2020-10-24 00:54:32,899 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-24 00:54:32,904 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-24 00:54:32,918 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-24 00:54:32,948 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-24 00:54:32,948 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-24 00:54:32,948 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-24 00:54:32,949 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-24 00:54:32,949 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-24 00:54:32,949 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-24 00:54:32,949 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-24 00:54:32,949 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-24 00:54:32,971 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states. [2020-10-24 00:54:32,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-10-24 00:54:32,983 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 00:54:32,985 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-24 00:54:32,985 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 00:54:32,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 00:54:32,994 INFO L82 PathProgramCache]: Analyzing trace with hash -407315157, now seen corresponding path program 1 times [2020-10-24 00:54:33,007 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 00:54:33,008 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [748973104] [2020-10-24 00:54:33,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 00:54:33,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 00:54:33,308 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-24 00:54:33,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 00:54:33,335 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-10-24 00:54:33,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 00:54:33,406 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-24 00:54:33,410 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [748973104] [2020-10-24 00:54:33,413 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-24 00:54:33,413 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-24 00:54:33,414 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082938230] [2020-10-24 00:54:33,422 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-24 00:54:33,423 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-24 00:54:33,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-24 00:54:33,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-24 00:54:33,451 INFO L87 Difference]: Start difference. First operand 46 states. Second operand 6 states. [2020-10-24 00:54:34,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 00:54:34,223 INFO L93 Difference]: Finished difference Result 61 states and 66 transitions. [2020-10-24 00:54:34,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-24 00:54:34,226 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 25 [2020-10-24 00:54:34,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 00:54:34,248 INFO L225 Difference]: With dead ends: 61 [2020-10-24 00:54:34,249 INFO L226 Difference]: Without dead ends: 41 [2020-10-24 00:54:34,269 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-10-24 00:54:34,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-10-24 00:54:34,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-10-24 00:54:34,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-10-24 00:54:34,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2020-10-24 00:54:34,387 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 25 [2020-10-24 00:54:34,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 00:54:34,388 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2020-10-24 00:54:34,388 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-24 00:54:34,389 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2020-10-24 00:54:34,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-10-24 00:54:34,394 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 00:54:34,395 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-24 00:54:34,396 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-24 00:54:34,396 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 00:54:34,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 00:54:34,399 INFO L82 PathProgramCache]: Analyzing trace with hash -795183819, now seen corresponding path program 1 times [2020-10-24 00:54:34,400 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 00:54:34,400 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1551303330] [2020-10-24 00:54:34,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 00:54:34,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 00:54:34,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-24 00:54:34,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 00:54:34,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-10-24 00:54:34,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 00:54:34,650 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-24 00:54:34,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 00:54:34,688 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-24 00:54:34,689 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1551303330] [2020-10-24 00:54:34,690 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-24 00:54:34,690 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-10-24 00:54:34,690 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [527951898] [2020-10-24 00:54:34,692 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-24 00:54:34,693 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-24 00:54:34,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-24 00:54:34,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-10-24 00:54:34,694 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 8 states. [2020-10-24 00:54:35,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 00:54:35,129 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2020-10-24 00:54:35,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-24 00:54:35,131 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 33 [2020-10-24 00:54:35,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 00:54:35,133 INFO L225 Difference]: With dead ends: 55 [2020-10-24 00:54:35,134 INFO L226 Difference]: Without dead ends: 48 [2020-10-24 00:54:35,136 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2020-10-24 00:54:35,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-10-24 00:54:35,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2020-10-24 00:54:35,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-10-24 00:54:35,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-10-24 00:54:35,179 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 33 [2020-10-24 00:54:35,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 00:54:35,180 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-10-24 00:54:35,180 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-24 00:54:35,180 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-10-24 00:54:35,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-10-24 00:54:35,182 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 00:54:35,183 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-24 00:54:35,183 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-24 00:54:35,183 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 00:54:35,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 00:54:35,185 INFO L82 PathProgramCache]: Analyzing trace with hash 870121323, now seen corresponding path program 1 times [2020-10-24 00:54:35,185 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 00:54:35,186 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1340269945] [2020-10-24 00:54:35,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 00:54:35,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 00:54:35,276 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-24 00:54:35,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 00:54:35,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-10-24 00:54:35,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 00:54:35,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-24 00:54:35,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 00:54:35,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-24 00:54:35,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 00:54:35,390 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-24 00:54:35,392 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1340269945] [2020-10-24 00:54:35,392 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-24 00:54:35,392 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-10-24 00:54:35,393 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1453352580] [2020-10-24 00:54:35,394 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-10-24 00:54:35,394 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-24 00:54:35,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-10-24 00:54:35,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-10-24 00:54:35,396 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 9 states. [2020-10-24 00:54:35,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 00:54:35,893 INFO L93 Difference]: Finished difference Result 65 states and 67 transitions. [2020-10-24 00:54:35,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-24 00:54:35,893 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 41 [2020-10-24 00:54:35,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 00:54:35,896 INFO L225 Difference]: With dead ends: 65 [2020-10-24 00:54:35,896 INFO L226 Difference]: Without dead ends: 58 [2020-10-24 00:54:35,897 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2020-10-24 00:54:35,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-10-24 00:54:35,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 51. [2020-10-24 00:54:35,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-10-24 00:54:35,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2020-10-24 00:54:35,919 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 41 [2020-10-24 00:54:35,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 00:54:35,920 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2020-10-24 00:54:35,920 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-10-24 00:54:35,920 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2020-10-24 00:54:35,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-10-24 00:54:35,922 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 00:54:35,922 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-24 00:54:35,923 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-24 00:54:35,923 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 00:54:35,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 00:54:35,924 INFO L82 PathProgramCache]: Analyzing trace with hash -308032267, now seen corresponding path program 1 times [2020-10-24 00:54:35,924 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 00:54:35,925 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1529599496] [2020-10-24 00:54:35,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 00:54:35,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 00:54:36,006 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-24 00:54:36,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 00:54:36,016 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-10-24 00:54:36,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 00:54:36,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-24 00:54:36,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 00:54:36,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-24 00:54:36,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 00:54:36,147 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-24 00:54:36,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 00:54:36,178 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-10-24 00:54:36,179 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1529599496] [2020-10-24 00:54:36,179 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-24 00:54:36,180 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-10-24 00:54:36,180 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849980645] [2020-10-24 00:54:36,181 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-10-24 00:54:36,181 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-24 00:54:36,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-24 00:54:36,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-10-24 00:54:36,182 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand 10 states. [2020-10-24 00:54:36,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 00:54:36,642 INFO L93 Difference]: Finished difference Result 75 states and 77 transitions. [2020-10-24 00:54:36,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-24 00:54:36,642 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 49 [2020-10-24 00:54:36,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 00:54:36,645 INFO L225 Difference]: With dead ends: 75 [2020-10-24 00:54:36,645 INFO L226 Difference]: Without dead ends: 68 [2020-10-24 00:54:36,646 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=59, Invalid=213, Unknown=0, NotChecked=0, Total=272 [2020-10-24 00:54:36,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-10-24 00:54:36,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 56. [2020-10-24 00:54:36,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-10-24 00:54:36,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-10-24 00:54:36,666 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 49 [2020-10-24 00:54:36,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 00:54:36,666 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-10-24 00:54:36,666 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-10-24 00:54:36,667 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-10-24 00:54:36,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-10-24 00:54:36,668 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 00:54:36,668 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-24 00:54:36,669 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-24 00:54:36,669 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 00:54:36,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 00:54:36,670 INFO L82 PathProgramCache]: Analyzing trace with hash -1623603797, now seen corresponding path program 2 times [2020-10-24 00:54:36,670 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 00:54:36,671 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1061993385] [2020-10-24 00:54:36,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 00:54:36,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 00:54:36,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-24 00:54:36,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 00:54:36,744 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-10-24 00:54:36,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 00:54:36,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-24 00:54:36,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 00:54:36,821 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-24 00:54:36,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 00:54:36,850 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-24 00:54:36,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 00:54:36,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-24 00:54:36,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 00:54:36,918 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-10-24 00:54:36,919 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1061993385] [2020-10-24 00:54:36,919 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-24 00:54:36,919 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-10-24 00:54:36,920 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1378373470] [2020-10-24 00:54:36,920 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-10-24 00:54:36,921 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-24 00:54:36,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-10-24 00:54:36,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2020-10-24 00:54:36,922 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 11 states. [2020-10-24 00:54:37,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 00:54:37,471 INFO L93 Difference]: Finished difference Result 85 states and 87 transitions. [2020-10-24 00:54:37,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-24 00:54:37,472 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 57 [2020-10-24 00:54:37,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 00:54:37,474 INFO L225 Difference]: With dead ends: 85 [2020-10-24 00:54:37,474 INFO L226 Difference]: Without dead ends: 78 [2020-10-24 00:54:37,475 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2020-10-24 00:54:37,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-10-24 00:54:37,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 61. [2020-10-24 00:54:37,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-10-24 00:54:37,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2020-10-24 00:54:37,495 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 57 [2020-10-24 00:54:37,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 00:54:37,496 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2020-10-24 00:54:37,496 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-10-24 00:54:37,496 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2020-10-24 00:54:37,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-10-24 00:54:37,498 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 00:54:37,498 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-24 00:54:37,498 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-24 00:54:37,499 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 00:54:37,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 00:54:37,500 INFO L82 PathProgramCache]: Analyzing trace with hash -1353914187, now seen corresponding path program 2 times [2020-10-24 00:54:37,500 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 00:54:37,500 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [268189146] [2020-10-24 00:54:37,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 00:54:37,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-24 00:54:37,519 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-24 00:54:37,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-24 00:54:37,542 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-24 00:54:37,587 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-10-24 00:54:37,587 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-24 00:54:37,588 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-24 00:54:37,673 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 12:54:37 BoogieIcfgContainer [2020-10-24 00:54:37,674 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-24 00:54:37,677 INFO L168 Benchmark]: Toolchain (without parser) took 5637.59 ms. Allocated memory was 152.0 MB in the beginning and 188.7 MB in the end (delta: 36.7 MB). Free memory was 128.8 MB in the beginning and 78.1 MB in the end (delta: 50.6 MB). Peak memory consumption was 87.9 MB. Max. memory is 8.0 GB. [2020-10-24 00:54:37,678 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 152.0 MB. Free memory was 126.7 MB in the beginning and 126.6 MB in the end (delta: 80.1 kB). There was no memory consumed. Max. memory is 8.0 GB. [2020-10-24 00:54:37,679 INFO L168 Benchmark]: CACSL2BoogieTranslator took 261.70 ms. Allocated memory is still 152.0 MB. Free memory was 128.1 MB in the beginning and 118.9 MB in the end (delta: 9.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. [2020-10-24 00:54:37,680 INFO L168 Benchmark]: Boogie Preprocessor took 33.65 ms. Allocated memory is still 152.0 MB. Free memory was 118.9 MB in the beginning and 117.6 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-10-24 00:54:37,681 INFO L168 Benchmark]: RCFGBuilder took 510.52 ms. Allocated memory is still 152.0 MB. Free memory was 117.5 MB in the beginning and 135.8 MB in the end (delta: -18.3 MB). Peak memory consumption was 16.9 MB. Max. memory is 8.0 GB. [2020-10-24 00:54:37,682 INFO L168 Benchmark]: TraceAbstraction took 4817.43 ms. Allocated memory was 152.0 MB in the beginning and 188.7 MB in the end (delta: 36.7 MB). Free memory was 135.4 MB in the beginning and 78.1 MB in the end (delta: 57.3 MB). Peak memory consumption was 94.0 MB. Max. memory is 8.0 GB. [2020-10-24 00:54:37,689 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28 ms. Allocated memory is still 152.0 MB. Free memory was 126.7 MB in the beginning and 126.6 MB in the end (delta: 80.1 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 261.70 ms. Allocated memory is still 152.0 MB. Free memory was 128.1 MB in the beginning and 118.9 MB in the end (delta: 9.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 33.65 ms. Allocated memory is still 152.0 MB. Free memory was 118.9 MB in the beginning and 117.6 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 510.52 ms. Allocated memory is still 152.0 MB. Free memory was 117.5 MB in the beginning and 135.8 MB in the end (delta: -18.3 MB). Peak memory consumption was 16.9 MB. Max. memory is 8.0 GB. * TraceAbstraction took 4817.43 ms. Allocated memory was 152.0 MB in the beginning and 188.7 MB in the end (delta: 36.7 MB). Free memory was 135.4 MB in the beginning and 78.1 MB in the end (delta: 57.3 MB). Peak memory consumption was 94.0 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 4]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L20] int input = 5; VAL [input=5] [L21] CALL, EXPR id(input) VAL [\old(x)=5] [L10] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=4] [L15] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L16] CALL, EXPR id(x-1) VAL [\old(x)=3] [L10] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=2] [L15] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L16] CALL, EXPR id(x-1) VAL [\old(x)=1] [L10] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=0] [L15] COND TRUE x==0 VAL [\old(x)=0, x=0] [L15] return 0; VAL [\old(x)=0, \result=0, x=0] [L11] RET, EXPR id2(x-1) VAL [\old(x)=1, id2(x-1)=0, x=1] [L11] return id2(x-1) + 1; VAL [\old(x)=1, \result=1, id2(x-1)=0, x=1] [L16] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L16] return id(x-1) + 1; VAL [\old(x)=2, \result=2, id(x-1)=1, x=2] [L11] RET, EXPR id2(x-1) VAL [\old(x)=3, id2(x-1)=2, x=3] [L11] return id2(x-1) + 1; VAL [\old(x)=3, \result=3, id2(x-1)=2, x=3] [L16] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L16] return id(x-1) + 1; VAL [\old(x)=4, \result=4, id(x-1)=3, x=4] [L11] RET, EXPR id2(x-1) VAL [\old(x)=5, id2(x-1)=4, x=5] [L11] return id2(x-1) + 1; VAL [\old(x)=5, \result=5, id2(x-1)=4, x=5] [L21] RET, EXPR id(input) VAL [id(input)=5, input=5] [L21] int result = id(input); VAL [id(input)=5, input=5, result=5] [L22] COND TRUE result == 5 VAL [input=5, result=5] [L23] CALL reach_error() [L4] __assert_fail("0", "id2_i5_o5-1.c", 4, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 46 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 4.6s, OverallIterations: 6, TraceHistogramMax: 3, AutomataDifference: 2.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 175 SDtfs, 283 SDslu, 380 SDs, 0 SdLazy, 612 SolverSat, 86 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 101 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 1.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=61occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 5 MinimizatonAttempts, 38 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.0s InterpolantComputationTime, 270 NumberOfCodeBlocks, 270 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 200 ConstructedInterpolants, 0 QuantifiedInterpolants, 23408 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 5 InterpolantComputations, 2 PerfectInterpolantSequences, 17/40 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...