/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-examples/standard_sentinel-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:26:32,290 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2019-11-07 01:26:32,317 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 01:26:32,318 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 01:26:32,319 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 01:26:32,320 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 01:26:32,321 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 01:26:32,322 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 01:26:32,324 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 01:26:32,327 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 01:26:32,328 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 01:26:32,330 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 01:26:32,331 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 01:26:32,332 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 01:26:32,334 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 01:26:32,343 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:26:32,344 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:26:32,345 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:26:32,346 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 01:26:32,360 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:26:32,361 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:26:32,362 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:26:32,362 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:26:32,362 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:26:32,363 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:26:32,363 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:26:32,363 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:26:32,363 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:26:32,363 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:26:32,364 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:26:32,364 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:26:32,364 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:26:32,364 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:26:32,365 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:26:32,365 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:26:32,365 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:26:32,365 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:26:32,366 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:26:32,366 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:26:32,366 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:26:32,366 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:26:32,366 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:26:32,367 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:26:32,367 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:26:32,367 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:26:32,367 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:26:32,367 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:26:32,368 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 01:26:32,654 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:26:32,669 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:26:32,672 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:26:32,674 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:26:32,674 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:26:32,675 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_sentinel-2.i [2019-11-07 01:26:32,754 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ea38dc945/b10042f53d8447689e9ab5739827a0b3/FLAG24beb1400 [2019-11-07 01:26:33,219 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:26:33,221 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_sentinel-2.i [2019-11-07 01:26:33,228 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ea38dc945/b10042f53d8447689e9ab5739827a0b3/FLAG24beb1400 [2019-11-07 01:26:33,575 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ea38dc945/b10042f53d8447689e9ab5739827a0b3 [2019-11-07 01:26:33,587 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:26:33,589 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:26:33,590 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:26:33,590 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:26:33,594 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:26:33,596 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:26:33" (1/1) ... [2019-11-07 01:26:33,599 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4d6e4bbb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:33, skipping insertion in model container [2019-11-07 01:26:33,599 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:26:33" (1/1) ... [2019-11-07 01:26:33,608 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:26:33,630 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:26:33,881 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:26:33,887 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:26:33,913 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:26:33,936 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:26:33,936 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:33 WrapperNode [2019-11-07 01:26:33,937 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:26:33,938 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:26:33,938 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:26:33,938 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:26:34,045 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:33" (1/1) ... [2019-11-07 01:26:34,045 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:33" (1/1) ... [2019-11-07 01:26:34,053 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:33" (1/1) ... [2019-11-07 01:26:34,054 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:33" (1/1) ... [2019-11-07 01:26:34,073 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:33" (1/1) ... [2019-11-07 01:26:34,080 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:33" (1/1) ... [2019-11-07 01:26:34,082 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:33" (1/1) ... [2019-11-07 01:26:34,089 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:26:34,090 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:26:34,090 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:26:34,090 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:26:34,091 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:33" (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 01:26:34,152 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:26:34,153 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:26:34,153 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 01:26:34,153 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:26:34,153 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:26:34,153 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 01:26:34,153 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 01:26:34,154 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:26:34,154 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 01:26:34,154 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:26:34,154 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:26:34,154 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:26:34,154 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:26:34,155 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:26:34,482 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:26:34,483 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-11-07 01:26:34,484 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:26:34 BoogieIcfgContainer [2019-11-07 01:26:34,484 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:26:34,485 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:26:34,485 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:26:34,488 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:26:34,489 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:26:33" (1/3) ... [2019-11-07 01:26:34,490 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75133362 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:26:34, skipping insertion in model container [2019-11-07 01:26:34,490 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:26:33" (2/3) ... [2019-11-07 01:26:34,490 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75133362 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:26:34, skipping insertion in model container [2019-11-07 01:26:34,490 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:26:34" (3/3) ... [2019-11-07 01:26:34,492 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_sentinel-2.i [2019-11-07 01:26:34,502 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:26:34,510 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:26:34,523 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:26:34,547 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:26:34,547 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:26:34,548 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:26:34,548 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:26:34,548 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:26:34,548 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:26:34,548 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:26:34,548 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:26:34,566 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2019-11-07 01:26:34,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-07 01:26:34,573 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:26:34,574 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:26:34,577 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:26:34,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:26:34,582 INFO L82 PathProgramCache]: Analyzing trace with hash 1895073184, now seen corresponding path program 1 times [2019-11-07 01:26:34,589 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:26:34,589 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2077526947] [2019-11-07 01:26:34,590 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:26:34,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:34,714 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:26:34,715 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2077526947] [2019-11-07 01:26:34,716 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:26:34,716 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-07 01:26:34,717 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593648570] [2019-11-07 01:26:34,721 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-11-07 01:26:34,721 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:26:34,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-11-07 01:26:34,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-07 01:26:34,734 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2019-11-07 01:26:34,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:26:34,753 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2019-11-07 01:26:34,753 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-11-07 01:26:34,754 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2019-11-07 01:26:34,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:26:34,762 INFO L225 Difference]: With dead ends: 31 [2019-11-07 01:26:34,763 INFO L226 Difference]: Without dead ends: 14 [2019-11-07 01:26:34,766 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-07 01:26:34,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-11-07 01:26:34,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-11-07 01:26:34,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-11-07 01:26:34,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2019-11-07 01:26:34,805 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 12 [2019-11-07 01:26:34,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:26:34,805 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2019-11-07 01:26:34,806 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-11-07 01:26:34,806 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2019-11-07 01:26:34,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-07 01:26:34,807 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:26:34,807 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:26:34,807 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:26:34,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:26:34,808 INFO L82 PathProgramCache]: Analyzing trace with hash -1607168598, now seen corresponding path program 1 times [2019-11-07 01:26:34,808 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:26:34,808 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1269558303] [2019-11-07 01:26:34,809 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:26:34,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:34,872 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:26:34,873 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1269558303] [2019-11-07 01:26:34,873 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:26:34,873 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:26:34,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1746073175] [2019-11-07 01:26:34,875 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:26:34,876 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:26:34,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:26:34,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:26:34,877 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 3 states. [2019-11-07 01:26:34,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:26:34,896 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2019-11-07 01:26:34,897 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:26:34,897 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2019-11-07 01:26:34,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:26:34,898 INFO L225 Difference]: With dead ends: 23 [2019-11-07 01:26:34,898 INFO L226 Difference]: Without dead ends: 15 [2019-11-07 01:26:34,899 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 01:26:34,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-11-07 01:26:34,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-11-07 01:26:34,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-11-07 01:26:34,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2019-11-07 01:26:34,905 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2019-11-07 01:26:34,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:26:34,905 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2019-11-07 01:26:34,906 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:26:34,906 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2019-11-07 01:26:34,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-07 01:26:34,907 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:26:34,907 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:26:34,907 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:26:34,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:26:34,908 INFO L82 PathProgramCache]: Analyzing trace with hash -710183188, now seen corresponding path program 1 times [2019-11-07 01:26:34,909 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:26:34,910 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1872004182] [2019-11-07 01:26:34,910 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:26:34,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:35,078 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:26:35,079 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1872004182] [2019-11-07 01:26:35,079 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:26:35,079 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-07 01:26:35,083 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543775228] [2019-11-07 01:26:35,083 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-07 01:26:35,084 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:26:35,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-07 01:26:35,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-07 01:26:35,084 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2019-11-07 01:26:35,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:26:35,134 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2019-11-07 01:26:35,135 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-07 01:26:35,135 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2019-11-07 01:26:35,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:26:35,136 INFO L225 Difference]: With dead ends: 22 [2019-11-07 01:26:35,136 INFO L226 Difference]: Without dead ends: 17 [2019-11-07 01:26:35,137 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-11-07 01:26:35,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-11-07 01:26:35,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-11-07 01:26:35,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-11-07 01:26:35,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2019-11-07 01:26:35,142 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 14 [2019-11-07 01:26:35,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:26:35,143 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2019-11-07 01:26:35,143 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-07 01:26:35,143 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2019-11-07 01:26:35,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-07 01:26:35,144 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:26:35,144 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:26:35,144 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:26:35,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:26:35,145 INFO L82 PathProgramCache]: Analyzing trace with hash 1319161073, now seen corresponding path program 1 times [2019-11-07 01:26:35,145 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:26:35,145 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1904631890] [2019-11-07 01:26:35,145 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:26:35,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:35,189 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 01:26:35,189 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1904631890] [2019-11-07 01:26:35,190 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [950756027] [2019-11-07 01:26:35,190 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 01:26:35,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:35,245 INFO L256 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 01:26:35,252 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:26:35,283 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 01:26:35,283 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:26:35,331 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 01:26:35,332 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [299447355] [2019-11-07 01:26:35,379 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2019-11-07 01:26:35,379 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:26:35,391 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:26:35,399 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:26:35,400 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:26:35,568 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:26:35,801 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:26:35,811 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:26:35,814 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:26:36,129 WARN L191 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2019-11-07 01:26:36,197 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:26:36,197 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 17 [2019-11-07 01:26:36,198 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378567148] [2019-11-07 01:26:36,199 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-07 01:26:36,199 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:26:36,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-07 01:26:36,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2019-11-07 01:26:36,200 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 17 states. [2019-11-07 01:26:36,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:26:36,590 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2019-11-07 01:26:36,590 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-07 01:26:36,591 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 16 [2019-11-07 01:26:36,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:26:36,592 INFO L225 Difference]: With dead ends: 30 [2019-11-07 01:26:36,592 INFO L226 Difference]: Without dead ends: 20 [2019-11-07 01:26:36,593 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=126, Invalid=576, Unknown=0, NotChecked=0, Total=702 [2019-11-07 01:26:36,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-07 01:26:36,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-11-07 01:26:36,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-07 01:26:36,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2019-11-07 01:26:36,600 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 16 [2019-11-07 01:26:36,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:26:36,600 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2019-11-07 01:26:36,600 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-07 01:26:36,600 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2019-11-07 01:26:36,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-07 01:26:36,601 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:26:36,601 INFO L410 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:26:36,806 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:26:36,807 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:26:36,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:26:36,808 INFO L82 PathProgramCache]: Analyzing trace with hash 922897583, now seen corresponding path program 2 times [2019-11-07 01:26:36,808 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:26:36,808 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1698133757] [2019-11-07 01:26:36,808 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:26:36,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:36,929 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 01:26:36,929 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1698133757] [2019-11-07 01:26:36,930 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1936215153] [2019-11-07 01:26:36,930 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 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 01:26:36,988 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-07 01:26:36,988 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:26:36,990 INFO L256 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 17 conjunts are in the unsatisfiable core [2019-11-07 01:26:36,995 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:26:37,162 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-07 01:26:37,162 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:26:37,288 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-07 01:26:37,288 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [115943151] [2019-11-07 01:26:37,291 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2019-11-07 01:26:37,292 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:26:37,292 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:26:37,293 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:26:37,293 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:26:37,328 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:26:37,478 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:26:37,486 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:26:37,487 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:26:37,881 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:26:37,882 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 7, 11] total 28 [2019-11-07 01:26:37,882 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428871501] [2019-11-07 01:26:37,883 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-11-07 01:26:37,883 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:26:37,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-11-07 01:26:37,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=673, Unknown=0, NotChecked=0, Total=756 [2019-11-07 01:26:37,884 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 28 states. [2019-11-07 01:26:39,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:26:39,230 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2019-11-07 01:26:39,231 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-11-07 01:26:39,231 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 19 [2019-11-07 01:26:39,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:26:39,232 INFO L225 Difference]: With dead ends: 39 [2019-11-07 01:26:39,232 INFO L226 Difference]: Without dead ends: 25 [2019-11-07 01:26:39,233 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 407 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=292, Invalid=1870, Unknown=0, NotChecked=0, Total=2162 [2019-11-07 01:26:39,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-11-07 01:26:39,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2019-11-07 01:26:39,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-11-07 01:26:39,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2019-11-07 01:26:39,240 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 19 [2019-11-07 01:26:39,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:26:39,240 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2019-11-07 01:26:39,240 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-11-07 01:26:39,240 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2019-11-07 01:26:39,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-11-07 01:26:39,241 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:26:39,241 INFO L410 BasicCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:26:39,444 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:26:39,453 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:26:39,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:26:39,453 INFO L82 PathProgramCache]: Analyzing trace with hash -841568069, now seen corresponding path program 3 times [2019-11-07 01:26:39,453 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:26:39,454 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [995807383] [2019-11-07 01:26:39,454 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:26:39,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:39,553 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 01:26:39,554 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [995807383] [2019-11-07 01:26:39,554 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1670345400] [2019-11-07 01:26:39,554 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 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 01:26:39,604 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:26:39,605 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:26:39,606 INFO L256 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-07 01:26:39,611 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:26:39,635 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 01:26:39,636 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:26:39,711 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 01:26:39,712 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1183123232] [2019-11-07 01:26:39,714 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2019-11-07 01:26:39,714 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:26:39,716 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:26:39,716 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:26:39,716 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:26:39,743 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:26:39,863 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:26:39,868 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:26:39,871 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:26:40,139 WARN L191 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2019-11-07 01:26:40,205 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:26:40,205 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 11] total 25 [2019-11-07 01:26:40,206 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838726387] [2019-11-07 01:26:40,206 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-07 01:26:40,208 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:26:40,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-07 01:26:40,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=466, Unknown=0, NotChecked=0, Total=600 [2019-11-07 01:26:40,210 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 25 states. [2019-11-07 01:26:40,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:26:40,813 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2019-11-07 01:26:40,813 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-11-07 01:26:40,814 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 24 [2019-11-07 01:26:40,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:26:40,815 INFO L225 Difference]: With dead ends: 46 [2019-11-07 01:26:40,815 INFO L226 Difference]: Without dead ends: 32 [2019-11-07 01:26:40,816 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 481 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=362, Invalid=1444, Unknown=0, NotChecked=0, Total=1806 [2019-11-07 01:26:40,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-07 01:26:40,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2019-11-07 01:26:40,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-07 01:26:40,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2019-11-07 01:26:40,824 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 24 [2019-11-07 01:26:40,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:26:40,824 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2019-11-07 01:26:40,825 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-07 01:26:40,825 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2019-11-07 01:26:40,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-11-07 01:26:40,826 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:26:40,826 INFO L410 BasicCegarLoop]: trace histogram [12, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:26:41,030 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:26:41,030 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:26:41,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:26:41,031 INFO L82 PathProgramCache]: Analyzing trace with hash 1957294841, now seen corresponding path program 4 times [2019-11-07 01:26:41,031 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:26:41,031 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [562347296] [2019-11-07 01:26:41,031 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:26:41,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:41,239 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 01:26:41,240 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [562347296] [2019-11-07 01:26:41,240 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [989469146] [2019-11-07 01:26:41,240 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 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 01:26:41,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:41,314 INFO L256 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-07 01:26:41,318 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:26:41,341 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 01:26:41,341 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:26:41,607 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 01:26:41,607 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1115206137] [2019-11-07 01:26:41,608 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2019-11-07 01:26:41,609 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:26:41,609 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:26:41,609 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:26:41,609 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:26:41,643 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:26:41,789 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:26:41,793 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:26:41,795 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:26:42,045 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2019-11-07 01:26:42,121 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:26:42,121 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 11] total 39 [2019-11-07 01:26:42,122 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177503368] [2019-11-07 01:26:42,122 INFO L442 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-11-07 01:26:42,123 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:26:42,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-11-07 01:26:42,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=1047, Unknown=0, NotChecked=0, Total=1482 [2019-11-07 01:26:42,124 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand 39 states. [2019-11-07 01:26:43,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:26:43,348 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2019-11-07 01:26:43,348 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2019-11-07 01:26:43,348 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 31 [2019-11-07 01:26:43,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:26:43,349 INFO L225 Difference]: With dead ends: 60 [2019-11-07 01:26:43,349 INFO L226 Difference]: Without dead ends: 46 [2019-11-07 01:26:43,352 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1230 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1237, Invalid=3733, Unknown=0, NotChecked=0, Total=4970 [2019-11-07 01:26:43,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-11-07 01:26:43,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2019-11-07 01:26:43,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-11-07 01:26:43,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2019-11-07 01:26:43,369 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 31 [2019-11-07 01:26:43,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:26:43,369 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2019-11-07 01:26:43,369 INFO L463 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-11-07 01:26:43,370 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2019-11-07 01:26:43,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-11-07 01:26:43,373 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:26:43,373 INFO L410 BasicCegarLoop]: trace histogram [26, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:26:43,573 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:26:43,574 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:26:43,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:26:43,574 INFO L82 PathProgramCache]: Analyzing trace with hash 1319947449, now seen corresponding path program 5 times [2019-11-07 01:26:43,575 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:26:43,575 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1663866703] [2019-11-07 01:26:43,575 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:26:43,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:43,985 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 01:26:43,986 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1663866703] [2019-11-07 01:26:43,986 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [108584622] [2019-11-07 01:26:43,986 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 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 01:26:44,053 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-11-07 01:26:44,053 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:26:44,054 INFO L256 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 27 conjunts are in the unsatisfiable core [2019-11-07 01:26:44,057 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:26:44,596 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2019-11-07 01:26:44,596 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:26:45,367 WARN L191 SmtUtils]: Spent 433.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2019-11-07 01:26:45,494 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2019-11-07 01:26:45,495 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [578914804] [2019-11-07 01:26:45,496 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2019-11-07 01:26:45,496 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:26:45,497 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:26:45,497 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:26:45,497 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:26:45,513 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:26:45,585 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:26:45,589 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:26:45,595 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:26:46,345 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:26:46,345 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 12, 11, 11] total 58 [2019-11-07 01:26:46,346 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [196693398] [2019-11-07 01:26:46,347 INFO L442 AbstractCegarLoop]: Interpolant automaton has 58 states [2019-11-07 01:26:46,348 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:26:46,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2019-11-07 01:26:46,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=523, Invalid=2783, Unknown=0, NotChecked=0, Total=3306 [2019-11-07 01:26:46,349 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand 58 states. [2019-11-07 01:26:48,889 WARN L191 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 63 [2019-11-07 01:26:49,138 WARN L191 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 69 [2019-11-07 01:26:49,473 WARN L191 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 74 [2019-11-07 01:26:49,682 WARN L191 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 52 [2019-11-07 01:26:50,029 WARN L191 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 57 [2019-11-07 01:26:50,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:26:50,895 INFO L93 Difference]: Finished difference Result 75 states and 81 transitions. [2019-11-07 01:26:50,896 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2019-11-07 01:26:50,897 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 45 [2019-11-07 01:26:50,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:26:50,898 INFO L225 Difference]: With dead ends: 75 [2019-11-07 01:26:50,898 INFO L226 Difference]: Without dead ends: 55 [2019-11-07 01:26:50,902 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2648 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=1729, Invalid=9613, Unknown=0, NotChecked=0, Total=11342 [2019-11-07 01:26:50,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-11-07 01:26:50,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2019-11-07 01:26:50,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-11-07 01:26:50,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2019-11-07 01:26:50,911 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 45 [2019-11-07 01:26:50,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:26:50,912 INFO L462 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2019-11-07 01:26:50,912 INFO L463 AbstractCegarLoop]: Interpolant automaton has 58 states. [2019-11-07 01:26:50,912 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2019-11-07 01:26:50,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-11-07 01:26:50,913 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:26:50,913 INFO L410 BasicCegarLoop]: trace histogram [27, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:26:51,120 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:26:51,121 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:26:51,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:26:51,121 INFO L82 PathProgramCache]: Analyzing trace with hash 191084431, now seen corresponding path program 6 times [2019-11-07 01:26:51,122 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:26:51,122 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [391395134] [2019-11-07 01:26:51,122 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:26:51,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:51,592 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-11-07 01:26:51,592 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [391395134] [2019-11-07 01:26:51,593 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1455418002] [2019-11-07 01:26:51,593 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 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 01:26:51,676 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:26:51,676 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:26:51,677 INFO L256 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 29 conjunts are in the unsatisfiable core [2019-11-07 01:26:51,685 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:26:51,700 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-11-07 01:26:51,700 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:26:52,702 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-11-07 01:26:52,703 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1434505400] [2019-11-07 01:26:52,704 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2019-11-07 01:26:52,704 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:26:52,705 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:26:52,705 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:26:52,705 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:26:52,726 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:26:52,812 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:26:52,817 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:26:52,818 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:26:53,139 WARN L191 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2019-11-07 01:26:53,212 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:26:53,213 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30, 11] total 69 [2019-11-07 01:26:53,213 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916906260] [2019-11-07 01:26:53,214 INFO L442 AbstractCegarLoop]: Interpolant automaton has 69 states [2019-11-07 01:26:53,214 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:26:53,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2019-11-07 01:26:53,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1740, Invalid=2952, Unknown=0, NotChecked=0, Total=4692 [2019-11-07 01:26:53,217 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 69 states. [2019-11-07 01:26:56,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:26:56,302 INFO L93 Difference]: Finished difference Result 106 states and 136 transitions. [2019-11-07 01:26:56,303 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2019-11-07 01:26:56,303 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 54 [2019-11-07 01:26:56,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:26:56,304 INFO L225 Difference]: With dead ends: 106 [2019-11-07 01:26:56,304 INFO L226 Difference]: Without dead ends: 84 [2019-11-07 01:26:56,311 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3660 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=5092, Invalid=11938, Unknown=0, NotChecked=0, Total=17030 [2019-11-07 01:26:56,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2019-11-07 01:26:56,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2019-11-07 01:26:56,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2019-11-07 01:26:56,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 85 transitions. [2019-11-07 01:26:56,341 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 85 transitions. Word has length 54 [2019-11-07 01:26:56,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:26:56,342 INFO L462 AbstractCegarLoop]: Abstraction has 84 states and 85 transitions. [2019-11-07 01:26:56,342 INFO L463 AbstractCegarLoop]: Interpolant automaton has 69 states. [2019-11-07 01:26:56,342 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 85 transitions. [2019-11-07 01:26:56,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2019-11-07 01:26:56,346 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:26:56,346 INFO L410 BasicCegarLoop]: trace histogram [56, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:26:56,547 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:26:56,547 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:26:56,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:26:56,548 INFO L82 PathProgramCache]: Analyzing trace with hash 1550959629, now seen corresponding path program 7 times [2019-11-07 01:26:56,548 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:26:56,549 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1864730068] [2019-11-07 01:26:56,549 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:26:56,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:58,021 INFO L134 CoverageAnalysis]: Checked inductivity of 1652 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-11-07 01:26:58,022 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1864730068] [2019-11-07 01:26:58,022 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1940781318] [2019-11-07 01:26:58,022 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 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 01:26:58,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:26:58,145 INFO L256 TraceCheckSpWp]: Trace formula consists of 434 conjuncts, 58 conjunts are in the unsatisfiable core [2019-11-07 01:26:58,149 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:26:58,182 INFO L134 CoverageAnalysis]: Checked inductivity of 1652 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-11-07 01:26:58,183 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:27:02,260 INFO L134 CoverageAnalysis]: Checked inductivity of 1652 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-11-07 01:27:02,260 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1465026625] [2019-11-07 01:27:02,271 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2019-11-07 01:27:02,271 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:27:02,272 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:27:02,272 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:27:02,272 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:27:02,310 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:27:02,443 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:27:02,447 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:27:02,448 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:27:03,002 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:27:03,002 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59, 11] total 127 [2019-11-07 01:27:03,003 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400735504] [2019-11-07 01:27:03,003 INFO L442 AbstractCegarLoop]: Interpolant automaton has 127 states [2019-11-07 01:27:03,004 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:27:03,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2019-11-07 01:27:03,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6815, Invalid=9187, Unknown=0, NotChecked=0, Total=16002 [2019-11-07 01:27:03,014 INFO L87 Difference]: Start difference. First operand 84 states and 85 transitions. Second operand 127 states. [2019-11-07 01:27:12,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:27:12,943 INFO L93 Difference]: Finished difference Result 164 states and 223 transitions. [2019-11-07 01:27:12,943 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 125 states. [2019-11-07 01:27:12,944 INFO L78 Accepts]: Start accepts. Automaton has 127 states. Word has length 83 [2019-11-07 01:27:12,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:27:12,946 INFO L225 Difference]: With dead ends: 164 [2019-11-07 01:27:12,946 INFO L226 Difference]: Without dead ends: 142 [2019-11-07 01:27:12,951 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 427 GetRequests, 182 SyntacticMatches, 0 SemanticMatches, 245 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11548 ImplicationChecksByTransitivity, 15.1s TimeCoverageRelationStatistics Valid=20201, Invalid=40561, Unknown=0, NotChecked=0, Total=60762 [2019-11-07 01:27:12,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2019-11-07 01:27:12,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2019-11-07 01:27:12,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2019-11-07 01:27:12,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 143 transitions. [2019-11-07 01:27:12,967 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 143 transitions. Word has length 83 [2019-11-07 01:27:12,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:27:12,967 INFO L462 AbstractCegarLoop]: Abstraction has 142 states and 143 transitions. [2019-11-07 01:27:12,967 INFO L463 AbstractCegarLoop]: Interpolant automaton has 127 states. [2019-11-07 01:27:12,967 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 143 transitions. [2019-11-07 01:27:12,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2019-11-07 01:27:12,969 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:27:12,969 INFO L410 BasicCegarLoop]: trace histogram [114, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:27:13,180 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:27:13,181 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:27:13,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:27:13,181 INFO L82 PathProgramCache]: Analyzing trace with hash 2110620493, now seen corresponding path program 8 times [2019-11-07 01:27:13,181 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:27:13,181 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1807573758] [2019-11-07 01:27:13,182 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:27:13,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat