/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/array-crafted/xor1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:17:49,317 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 01:17:49,320 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 01:17:49,338 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-07 01:17:49,338 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-07 01:17:49,340 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-07 01:17:49,342 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-07 01:17:49,351 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-07 01:17:49,357 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-07 01:17:49,360 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-07 01:17:49,362 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-07 01:17:49,363 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-07 01:17:49,363 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 01:17:49,365 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 01:17:49,367 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 01:17:49,369 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 01:17:49,370 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 01:17:49,371 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 01:17:49,372 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 01:17:49,377 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 01:17:49,381 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 01:17:49,384 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 01:17:49,387 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 01:17:49,387 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 01:17:49,392 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 01:17:49,401 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:17:49,402 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:17:49,403 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:17:49,404 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-07 01:17:49,418 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:17:49,418 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:17:49,419 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:17:49,419 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:17:49,419 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:17:49,420 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:17:49,420 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:17:49,420 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:17:49,420 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:17:49,421 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:17:49,421 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:17:49,421 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:17:49,421 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:17:49,421 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:17:49,422 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:17:49,422 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:17:49,422 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:17:49,422 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:17:49,422 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:17:49,423 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:17:49,423 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:17:49,423 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:17:49,423 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:17:49,423 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:17:49,424 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:17:49,424 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:17:49,424 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:17:49,424 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:17:49,424 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> SIFA_TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> CompoundDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> LoopFreeBlock Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Call Summarizer -> TopInputCallSummarizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Fluid -> SizeLimitFluid Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Simplification Technique -> SIMPLIFY_QUICK [2019-11-07 01:17:49,752 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:17:49,775 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:17:49,780 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:17:49,781 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:17:49,782 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:17:49,783 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-crafted/xor1.i [2019-11-07 01:17:49,850 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f13c14728/a29f9676403548448f0f569da80f381a/FLAGfb6e63363 [2019-11-07 01:17:50,320 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:17:50,322 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-crafted/xor1.i [2019-11-07 01:17:50,328 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f13c14728/a29f9676403548448f0f569da80f381a/FLAGfb6e63363 [2019-11-07 01:17:50,726 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f13c14728/a29f9676403548448f0f569da80f381a [2019-11-07 01:17:50,752 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:17:50,754 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:17:50,759 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:17:50,760 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:17:50,769 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:17:50,770 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:17:50" (1/1) ... [2019-11-07 01:17:50,778 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@245c3bac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:17:50, skipping insertion in model container [2019-11-07 01:17:50,778 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:17:50" (1/1) ... [2019-11-07 01:17:50,792 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:17:50,844 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:17:51,128 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:17:51,137 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:17:51,158 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:17:51,261 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:17:51,261 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:17:51 WrapperNode [2019-11-07 01:17:51,261 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:17:51,262 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:17:51,262 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:17:51,262 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:17:51,277 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:17:51" (1/1) ... [2019-11-07 01:17:51,277 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:17:51" (1/1) ... [2019-11-07 01:17:51,286 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:17:51" (1/1) ... [2019-11-07 01:17:51,286 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:17:51" (1/1) ... [2019-11-07 01:17:51,296 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:17:51" (1/1) ... [2019-11-07 01:17:51,302 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:17:51" (1/1) ... [2019-11-07 01:17:51,304 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:17:51" (1/1) ... [2019-11-07 01:17:51,306 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:17:51,307 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:17:51,307 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:17:51,307 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:17:51,308 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:17:51" (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 [2019-11-07 01:17:51,367 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:17:51,368 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:17:51,368 INFO L138 BoogieDeclarations]: Found implementation of procedure xor [2019-11-07 01:17:51,368 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:17:51,368 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:17:51,368 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 01:17:51,369 INFO L130 BoogieDeclarations]: Found specification of procedure xor [2019-11-07 01:17:51,369 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:17:51,369 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:17:51,369 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 01:17:51,369 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:17:51,369 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:17:51,370 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:17:51,370 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:17:51,725 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:17:51,725 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-11-07 01:17:51,727 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:17:51 BoogieIcfgContainer [2019-11-07 01:17:51,727 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:17:51,728 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:17:51,729 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:17:51,732 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:17:51,732 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:17:50" (1/3) ... [2019-11-07 01:17:51,733 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58332e28 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:17:51, skipping insertion in model container [2019-11-07 01:17:51,733 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:17:51" (2/3) ... [2019-11-07 01:17:51,734 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58332e28 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:17:51, skipping insertion in model container [2019-11-07 01:17:51,734 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:17:51" (3/3) ... [2019-11-07 01:17:51,736 INFO L109 eAbstractionObserver]: Analyzing ICFG xor1.i [2019-11-07 01:17:51,748 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:17:51,756 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:17:51,769 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:17:51,799 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:17:51,800 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:17:51,800 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:17:51,800 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:17:51,800 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:17:51,801 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:17:51,801 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:17:51,801 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:17:51,818 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2019-11-07 01:17:51,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-11-07 01:17:51,825 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:17:51,827 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:17:51,829 INFO L410 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:17:51,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:17:51,834 INFO L82 PathProgramCache]: Analyzing trace with hash -809725829, now seen corresponding path program 1 times [2019-11-07 01:17:51,843 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:17:51,843 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [611840922] [2019-11-07 01:17:51,843 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:17:51,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:17:52,038 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-07 01:17:52,039 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [611840922] [2019-11-07 01:17:52,040 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:17:52,040 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:17:52,041 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [351418033] [2019-11-07 01:17:52,050 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:17:52,051 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:17:52,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:17:52,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:17:52,069 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 3 states. [2019-11-07 01:17:52,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:17:52,127 INFO L93 Difference]: Finished difference Result 41 states and 51 transitions. [2019-11-07 01:17:52,129 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:17:52,131 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2019-11-07 01:17:52,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:17:52,152 INFO L225 Difference]: With dead ends: 41 [2019-11-07 01:17:52,153 INFO L226 Difference]: Without dead ends: 20 [2019-11-07 01:17:52,159 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:17:52,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-07 01:17:52,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-11-07 01:17:52,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-07 01:17:52,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2019-11-07 01:17:52,227 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 24 [2019-11-07 01:17:52,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:17:52,229 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2019-11-07 01:17:52,229 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:17:52,230 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2019-11-07 01:17:52,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-07 01:17:52,234 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:17:52,234 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:17:52,235 INFO L410 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:17:52,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:17:52,236 INFO L82 PathProgramCache]: Analyzing trace with hash 994996090, now seen corresponding path program 1 times [2019-11-07 01:17:52,236 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:17:52,237 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [335515878] [2019-11-07 01:17:52,237 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:17:52,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:17:52,396 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 01:17:52,396 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [335515878] [2019-11-07 01:17:52,396 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1567586801] [2019-11-07 01:17:52,397 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:17:52,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:17:52,472 INFO L256 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 2 conjunts are in the unsatisfiable core [2019-11-07 01:17:52,479 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:17:52,506 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 01:17:52,506 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:17:52,556 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 01:17:52,558 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-11-07 01:17:52,558 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 5 [2019-11-07 01:17:52,559 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1670086167] [2019-11-07 01:17:52,560 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:17:52,561 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:17:52,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:17:52,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-07 01:17:52,561 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand 3 states. [2019-11-07 01:17:52,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:17:52,577 INFO L93 Difference]: Finished difference Result 33 states and 43 transitions. [2019-11-07 01:17:52,578 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:17:52,578 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2019-11-07 01:17:52,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:17:52,579 INFO L225 Difference]: With dead ends: 33 [2019-11-07 01:17:52,579 INFO L226 Difference]: Without dead ends: 21 [2019-11-07 01:17:52,581 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-07 01:17:52,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-11-07 01:17:52,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-11-07 01:17:52,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-07 01:17:52,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2019-11-07 01:17:52,595 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 25 [2019-11-07 01:17:52,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:17:52,596 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2019-11-07 01:17:52,597 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:17:52,598 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2019-11-07 01:17:52,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-11-07 01:17:52,600 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:17:52,600 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:17:52,801 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:17:52,802 INFO L410 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:17:52,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:17:52,803 INFO L82 PathProgramCache]: Analyzing trace with hash -421018474, now seen corresponding path program 1 times [2019-11-07 01:17:52,804 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:17:52,804 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1970791700] [2019-11-07 01:17:52,805 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:17:52,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:17:52,890 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-11-07 01:17:52,891 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1970791700] [2019-11-07 01:17:52,891 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:17:52,891 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:17:52,892 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [581719103] [2019-11-07 01:17:52,892 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:17:52,893 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:17:52,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:17:52,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:17:52,894 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 3 states. [2019-11-07 01:17:52,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:17:52,909 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2019-11-07 01:17:52,910 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:17:52,910 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2019-11-07 01:17:52,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:17:52,911 INFO L225 Difference]: With dead ends: 31 [2019-11-07 01:17:52,911 INFO L226 Difference]: Without dead ends: 22 [2019-11-07 01:17:52,912 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:17:52,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-07 01:17:52,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-11-07 01:17:52,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-11-07 01:17:52,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2019-11-07 01:17:52,918 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 28 [2019-11-07 01:17:52,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:17:52,923 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2019-11-07 01:17:52,923 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:17:52,923 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2019-11-07 01:17:52,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-11-07 01:17:52,925 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:17:52,925 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:17:52,925 INFO L410 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:17:52,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:17:52,926 INFO L82 PathProgramCache]: Analyzing trace with hash -661634715, now seen corresponding path program 1 times [2019-11-07 01:17:52,926 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:17:52,926 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [220945926] [2019-11-07 01:17:52,926 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:17:52,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:17:53,025 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-11-07 01:17:53,026 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [220945926] [2019-11-07 01:17:53,026 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1771233428] [2019-11-07 01:17:53,026 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:17:53,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:17:53,116 INFO L256 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 01:17:53,119 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:17:53,149 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-11-07 01:17:53,149 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:17:53,222 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-11-07 01:17:53,223 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [515674553] [2019-11-07 01:17:53,251 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-11-07 01:17:53,252 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:17:53,258 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:17:53,266 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:17:53,266 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:17:53,425 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:17:53,941 INFO L197 IcfgInterpreter]: Interpreting procedure xor with input of size 1 for LOIs [2019-11-07 01:17:53,975 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:17:53,978 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:17:54,679 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:17:54,680 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 15] total 21 [2019-11-07 01:17:54,680 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [113769006] [2019-11-07 01:17:54,681 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-07 01:17:54,681 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:17:54,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-07 01:17:54,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2019-11-07 01:17:54,683 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 21 states. [2019-11-07 01:17:57,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:17:57,854 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2019-11-07 01:17:57,859 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-07 01:17:57,859 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 29 [2019-11-07 01:17:57,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:17:57,860 INFO L225 Difference]: With dead ends: 40 [2019-11-07 01:17:57,860 INFO L226 Difference]: Without dead ends: 25 [2019-11-07 01:17:57,865 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 312 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=170, Invalid=1089, Unknown=1, NotChecked=0, Total=1260 [2019-11-07 01:17:57,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-11-07 01:17:57,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2019-11-07 01:17:57,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-11-07 01:17:57,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2019-11-07 01:17:57,878 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 29 [2019-11-07 01:17:57,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:17:57,878 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2019-11-07 01:17:57,879 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-07 01:17:57,879 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2019-11-07 01:17:57,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-11-07 01:17:57,880 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:17:57,881 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:17:58,085 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:17:58,085 INFO L410 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:17:58,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:17:58,086 INFO L82 PathProgramCache]: Analyzing trace with hash -139894362, now seen corresponding path program 2 times [2019-11-07 01:17:58,086 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:17:58,086 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [737842352] [2019-11-07 01:17:58,087 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:17:58,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:17:58,220 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-11-07 01:17:58,220 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [737842352] [2019-11-07 01:17:58,221 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1538106124] [2019-11-07 01:17:58,221 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:17:58,272 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-07 01:17:58,272 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:17:58,273 INFO L256 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 01:17:58,276 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:17:58,292 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-07 01:17:58,293 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:17:58,346 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-07 01:17:58,346 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1096816947] [2019-11-07 01:17:58,348 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-11-07 01:17:58,348 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:17:58,349 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:17:58,349 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:17:58,349 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:17:58,396 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:17:58,795 INFO L197 IcfgInterpreter]: Interpreting procedure xor with input of size 1 for LOIs [2019-11-07 01:17:58,829 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:17:58,830 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:18:01,668 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:18:01,669 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 4, 15] total 25 [2019-11-07 01:18:01,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472680640] [2019-11-07 01:18:01,670 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-07 01:18:01,671 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:01,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-07 01:18:01,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=524, Unknown=1, NotChecked=0, Total=600 [2019-11-07 01:18:01,672 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 25 states. [2019-11-07 01:18:04,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:04,831 INFO L93 Difference]: Finished difference Result 44 states and 58 transitions. [2019-11-07 01:18:04,832 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-11-07 01:18:04,832 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2019-11-07 01:18:04,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:04,833 INFO L225 Difference]: With dead ends: 44 [2019-11-07 01:18:04,834 INFO L226 Difference]: Without dead ends: 29 [2019-11-07 01:18:04,836 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 451 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=247, Invalid=1731, Unknown=2, NotChecked=0, Total=1980 [2019-11-07 01:18:04,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-11-07 01:18:04,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2019-11-07 01:18:04,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-07 01:18:04,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2019-11-07 01:18:04,843 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 32 [2019-11-07 01:18:04,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:04,844 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2019-11-07 01:18:04,844 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-07 01:18:04,844 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2019-11-07 01:18:04,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-11-07 01:18:04,845 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:04,845 INFO L410 BasicCegarLoop]: trace histogram [12, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:05,049 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:05,050 INFO L410 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:05,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:05,050 INFO L82 PathProgramCache]: Analyzing trace with hash -1028595953, now seen corresponding path program 3 times [2019-11-07 01:18:05,051 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:05,051 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2015515112] [2019-11-07 01:18:05,051 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:05,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:05,168 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-11-07 01:18:05,168 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2015515112] [2019-11-07 01:18:05,169 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [187329809] [2019-11-07 01:18:05,169 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:05,254 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:18:05,254 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:18:05,255 INFO L256 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-07 01:18:05,270 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:18:05,283 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-11-07 01:18:05,283 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:18:05,381 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-11-07 01:18:05,382 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [718619669] [2019-11-07 01:18:05,383 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-11-07 01:18:05,384 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:18:05,384 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:18:05,384 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:18:05,384 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:18:05,406 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:18:05,690 INFO L197 IcfgInterpreter]: Interpreting procedure xor with input of size 1 for LOIs [2019-11-07 01:18:05,706 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:18:05,707 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:18:06,504 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:18:06,505 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 15] total 29 [2019-11-07 01:18:06,505 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596850242] [2019-11-07 01:18:06,507 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-11-07 01:18:06,507 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:06,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-11-07 01:18:06,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=667, Unknown=0, NotChecked=0, Total=812 [2019-11-07 01:18:06,511 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 29 states. [2019-11-07 01:18:09,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:09,861 INFO L93 Difference]: Finished difference Result 54 states and 68 transitions. [2019-11-07 01:18:09,862 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-11-07 01:18:09,862 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 42 [2019-11-07 01:18:09,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:09,863 INFO L225 Difference]: With dead ends: 54 [2019-11-07 01:18:09,864 INFO L226 Difference]: Without dead ends: 36 [2019-11-07 01:18:09,866 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 761 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=406, Invalid=2245, Unknown=1, NotChecked=0, Total=2652 [2019-11-07 01:18:09,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-11-07 01:18:09,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2019-11-07 01:18:09,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-07 01:18:09,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2019-11-07 01:18:09,874 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 42 [2019-11-07 01:18:09,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:09,874 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2019-11-07 01:18:09,875 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-11-07 01:18:09,875 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2019-11-07 01:18:09,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2019-11-07 01:18:09,876 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:09,876 INFO L410 BasicCegarLoop]: trace histogram [12, 12, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:10,079 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:10,080 INFO L410 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:10,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:10,080 INFO L82 PathProgramCache]: Analyzing trace with hash -500498258, now seen corresponding path program 4 times [2019-11-07 01:18:10,080 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:10,083 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [909991149] [2019-11-07 01:18:10,083 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:10,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:10,361 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-11-07 01:18:10,362 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [909991149] [2019-11-07 01:18:10,362 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1450275297] [2019-11-07 01:18:10,362 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:10,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:10,440 INFO L256 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-07 01:18:10,447 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:18:10,463 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-11-07 01:18:10,463 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:18:10,768 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-11-07 01:18:10,769 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [654363166] [2019-11-07 01:18:10,770 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-11-07 01:18:10,770 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:18:10,771 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:18:10,771 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:18:10,771 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:18:10,803 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:18:11,041 INFO L197 IcfgInterpreter]: Interpreting procedure xor with input of size 1 for LOIs [2019-11-07 01:18:11,063 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:18:11,065 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:18:13,884 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:18:13,884 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15] total 43 [2019-11-07 01:18:13,884 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327398729] [2019-11-07 01:18:13,885 INFO L442 AbstractCegarLoop]: Interpolant automaton has 43 states [2019-11-07 01:18:13,885 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:13,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2019-11-07 01:18:13,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=446, Invalid=1359, Unknown=1, NotChecked=0, Total=1806 [2019-11-07 01:18:13,887 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand 43 states. [2019-11-07 01:18:15,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:15,700 INFO L93 Difference]: Finished difference Result 68 states and 89 transitions. [2019-11-07 01:18:15,701 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2019-11-07 01:18:15,701 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 49 [2019-11-07 01:18:15,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:15,703 INFO L225 Difference]: With dead ends: 68 [2019-11-07 01:18:15,703 INFO L226 Difference]: Without dead ends: 50 [2019-11-07 01:18:15,706 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1742 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=1281, Invalid=5038, Unknown=1, NotChecked=0, Total=6320 [2019-11-07 01:18:15,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-11-07 01:18:15,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2019-11-07 01:18:15,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2019-11-07 01:18:15,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2019-11-07 01:18:15,716 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 49 [2019-11-07 01:18:15,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:15,717 INFO L462 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2019-11-07 01:18:15,717 INFO L463 AbstractCegarLoop]: Interpolant automaton has 43 states. [2019-11-07 01:18:15,717 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2019-11-07 01:18:15,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-11-07 01:18:15,718 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:15,719 INFO L410 BasicCegarLoop]: trace histogram [26, 12, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:15,922 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:15,923 INFO L410 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:15,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:15,923 INFO L82 PathProgramCache]: Analyzing trace with hash 1795685774, now seen corresponding path program 5 times [2019-11-07 01:18:15,923 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:15,924 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1914881822] [2019-11-07 01:18:15,924 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:16,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:16,387 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-11-07 01:18:16,387 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1914881822] [2019-11-07 01:18:16,388 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1883889840] [2019-11-07 01:18:16,388 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:16,466 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 01:18:16,466 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:18:16,467 INFO L256 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 01:18:16,470 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:18:16,530 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 54 proven. 1 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2019-11-07 01:18:16,531 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:18:16,581 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2019-11-07 01:18:16,582 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [858470755] [2019-11-07 01:18:16,583 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-11-07 01:18:16,583 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:18:16,584 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:18:16,584 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:18:16,584 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:18:16,600 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:18:16,822 INFO L197 IcfgInterpreter]: Interpreting procedure xor with input of size 1 for LOIs [2019-11-07 01:18:16,838 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:18:16,842 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:18:20,143 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:18:20,144 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 4, 4, 15] total 47 [2019-11-07 01:18:20,144 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788163751] [2019-11-07 01:18:20,145 INFO L442 AbstractCegarLoop]: Interpolant automaton has 47 states [2019-11-07 01:18:20,146 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:20,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2019-11-07 01:18:20,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=460, Invalid=1701, Unknown=1, NotChecked=0, Total=2162 [2019-11-07 01:18:20,147 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand 47 states. [2019-11-07 01:18:27,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:27,008 INFO L93 Difference]: Finished difference Result 72 states and 83 transitions. [2019-11-07 01:18:27,009 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2019-11-07 01:18:27,009 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 63 [2019-11-07 01:18:27,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:27,011 INFO L225 Difference]: With dead ends: 72 [2019-11-07 01:18:27,011 INFO L226 Difference]: Without dead ends: 54 [2019-11-07 01:18:27,014 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1695 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=1386, Invalid=6444, Unknown=2, NotChecked=0, Total=7832 [2019-11-07 01:18:27,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-11-07 01:18:27,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2019-11-07 01:18:27,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2019-11-07 01:18:27,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2019-11-07 01:18:27,040 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 63 [2019-11-07 01:18:27,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:27,040 INFO L462 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2019-11-07 01:18:27,041 INFO L463 AbstractCegarLoop]: Interpolant automaton has 47 states. [2019-11-07 01:18:27,041 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2019-11-07 01:18:27,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-11-07 01:18:27,043 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:27,044 INFO L410 BasicCegarLoop]: trace histogram [27, 12, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:27,247 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:27,247 INFO L410 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:27,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:27,247 INFO L82 PathProgramCache]: Analyzing trace with hash -344788902, now seen corresponding path program 6 times [2019-11-07 01:18:27,248 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:27,248 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1096218322] [2019-11-07 01:18:27,248 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:27,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:27,689 INFO L134 CoverageAnalysis]: Checked inductivity of 499 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-11-07 01:18:27,689 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1096218322] [2019-11-07 01:18:27,689 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1703672251] [2019-11-07 01:18:27,689 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:27,790 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:18:27,790 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:18:27,792 INFO L256 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 29 conjunts are in the unsatisfiable core [2019-11-07 01:18:27,795 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:18:27,815 INFO L134 CoverageAnalysis]: Checked inductivity of 499 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-11-07 01:18:27,816 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:18:28,760 INFO L134 CoverageAnalysis]: Checked inductivity of 499 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-11-07 01:18:28,761 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1413843988] [2019-11-07 01:18:28,762 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-11-07 01:18:28,762 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:18:28,762 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:18:28,763 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:18:28,763 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:18:28,801 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:18:29,027 INFO L197 IcfgInterpreter]: Interpreting procedure xor with input of size 1 for LOIs [2019-11-07 01:18:29,044 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:18:29,046 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:18:29,900 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:18:29,900 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30, 15] total 73 [2019-11-07 01:18:29,901 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1370337797] [2019-11-07 01:18:29,902 INFO L442 AbstractCegarLoop]: Interpolant automaton has 73 states [2019-11-07 01:18:29,902 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:29,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2019-11-07 01:18:29,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1751, Invalid=3505, Unknown=0, NotChecked=0, Total=5256 [2019-11-07 01:18:29,905 INFO L87 Difference]: Start difference. First operand 54 states and 58 transitions. Second operand 73 states.