/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-multidimensional/init-non-constant-2-n-u.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:29:52,396 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 01:29:52,398 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 01:29:52,411 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-07 01:29:52,411 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-07 01:29:52,412 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-07 01:29:52,414 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-07 01:29:52,416 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-07 01:29:52,417 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-07 01:29:52,418 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-07 01:29:52,419 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-07 01:29:52,421 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-07 01:29:52,421 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 01:29:52,422 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 01:29:52,423 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 01:29:52,424 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 01:29:52,425 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 01:29:52,426 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 01:29:52,428 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 01:29:52,431 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 01:29:52,433 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 01:29:52,434 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 01:29:52,435 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 01:29:52,436 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 01:29:52,439 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 01:29:52,443 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-07 01:29:52,444 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-07 01:29:52,445 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-07 01:29:52,446 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-07 01:29:52,447 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-07 01:29:52,447 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-07 01:29:52,448 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-07 01:29:52,448 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-07 01:29:52,448 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:29:52,449 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:29:52,450 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:29:52,451 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 01:29:52,467 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:29:52,467 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:29:52,468 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:29:52,469 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:29:52,469 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:29:52,469 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:29:52,469 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:29:52,469 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:29:52,470 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:29:52,470 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:29:52,470 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:29:52,470 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:29:52,470 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:29:52,471 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:29:52,471 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:29:52,471 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:29:52,471 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:29:52,471 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:29:52,472 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:29:52,472 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:29:52,472 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:29:52,472 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:29:52,473 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:29:52,473 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:29:52,473 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:29:52,473 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:29:52,473 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:29:52,474 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:29:52,476 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 01:29:52,763 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:29:52,785 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:29:52,789 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:29:52,791 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:29:52,792 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:29:52,793 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-multidimensional/init-non-constant-2-n-u.c [2019-11-07 01:29:52,867 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/40f7f5232/ba16d00130ff43f98aa2fd606deb494d/FLAG3f91cc0d5 [2019-11-07 01:29:53,344 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:29:53,346 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-multidimensional/init-non-constant-2-n-u.c [2019-11-07 01:29:53,353 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/40f7f5232/ba16d00130ff43f98aa2fd606deb494d/FLAG3f91cc0d5 [2019-11-07 01:29:53,728 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/40f7f5232/ba16d00130ff43f98aa2fd606deb494d [2019-11-07 01:29:53,736 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:29:53,738 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:29:53,740 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:29:53,740 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:29:53,743 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:29:53,744 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:29:53" (1/1) ... [2019-11-07 01:29:53,748 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3b00cbb0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:53, skipping insertion in model container [2019-11-07 01:29:53,748 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:29:53" (1/1) ... [2019-11-07 01:29:53,755 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:29:53,780 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:29:53,966 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:29:53,970 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:29:53,996 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:29:54,109 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:29:54,111 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:54 WrapperNode [2019-11-07 01:29:54,111 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:29:54,112 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:29:54,112 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:29:54,113 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:29:54,123 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:54" (1/1) ... [2019-11-07 01:29:54,123 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:54" (1/1) ... [2019-11-07 01:29:54,129 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:54" (1/1) ... [2019-11-07 01:29:54,131 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:54" (1/1) ... [2019-11-07 01:29:54,147 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:54" (1/1) ... [2019-11-07 01:29:54,154 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:54" (1/1) ... [2019-11-07 01:29:54,159 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:54" (1/1) ... [2019-11-07 01:29:54,163 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:29:54,164 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:29:54,164 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:29:54,164 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:29:54,165 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:54" (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 01:29:54,217 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:29:54,218 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:29:54,218 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 01:29:54,218 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:29:54,218 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:29:54,218 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-11-07 01:29:54,218 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 01:29:54,218 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 01:29:54,218 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2019-11-07 01:29:54,219 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:29:54,219 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 01:29:54,219 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:29:54,219 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:29:54,219 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:29:54,219 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:29:54,220 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:29:54,553 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:29:54,553 INFO L284 CfgBuilder]: Removed 4 assume(true) statements. [2019-11-07 01:29:54,555 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:29:54 BoogieIcfgContainer [2019-11-07 01:29:54,555 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:29:54,560 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:29:54,560 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:29:54,563 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:29:54,564 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:29:53" (1/3) ... [2019-11-07 01:29:54,565 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d1dda41 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:29:54, skipping insertion in model container [2019-11-07 01:29:54,565 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:54" (2/3) ... [2019-11-07 01:29:54,565 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d1dda41 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:29:54, skipping insertion in model container [2019-11-07 01:29:54,565 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:29:54" (3/3) ... [2019-11-07 01:29:54,567 INFO L109 eAbstractionObserver]: Analyzing ICFG init-non-constant-2-n-u.c [2019-11-07 01:29:54,578 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:29:54,586 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:29:54,598 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:29:54,620 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:29:54,621 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:29:54,621 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:29:54,621 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:29:54,621 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:29:54,621 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:29:54,621 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:29:54,621 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:29:54,635 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2019-11-07 01:29:54,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-07 01:29:54,640 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:29:54,641 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:29:54,643 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:29:54,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:29:54,648 INFO L82 PathProgramCache]: Analyzing trace with hash 104319440, now seen corresponding path program 1 times [2019-11-07 01:29:54,655 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:29:54,655 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1427930951] [2019-11-07 01:29:54,655 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:29:54,738 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 01:29:54,739 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1110063708] [2019-11-07 01:29:54,739 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 01:29:54,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:29:54,812 INFO L256 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-07 01:29:54,818 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:29:54,872 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 01:29:54,873 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:29:54,899 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 01:29:54,899 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1427930951] [2019-11-07 01:29:54,899 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 01:29:54,900 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1110063708] [2019-11-07 01:29:54,901 INFO L218 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:29:54,901 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 5 [2019-11-07 01:29:54,902 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576703380] [2019-11-07 01:29:54,907 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-07 01:29:54,907 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:29:54,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-07 01:29:54,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-11-07 01:29:54,921 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2019-11-07 01:29:55,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:29:55,032 INFO L93 Difference]: Finished difference Result 42 states and 56 transitions. [2019-11-07 01:29:55,033 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-07 01:29:55,035 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2019-11-07 01:29:55,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:29:55,044 INFO L225 Difference]: With dead ends: 42 [2019-11-07 01:29:55,045 INFO L226 Difference]: Without dead ends: 23 [2019-11-07 01:29:55,048 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2019-11-07 01:29:55,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-11-07 01:29:55,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 18. [2019-11-07 01:29:55,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-11-07 01:29:55,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2019-11-07 01:29:55,093 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 12 [2019-11-07 01:29:55,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:29:55,093 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2019-11-07 01:29:55,094 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-07 01:29:55,094 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2019-11-07 01:29:55,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-07 01:29:55,095 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:29:55,095 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:29:55,298 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:29:55,299 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:29:55,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:29:55,301 INFO L82 PathProgramCache]: Analyzing trace with hash 718122281, now seen corresponding path program 1 times [2019-11-07 01:29:55,301 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:29:55,302 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205939947] [2019-11-07 01:29:55,302 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:29:55,342 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 01:29:55,343 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1314257044] [2019-11-07 01:29:55,343 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 01:29:55,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:29:55,441 INFO L256 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-07 01:29:55,443 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:29:55,466 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:29:55,467 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:29:55,492 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:29:55,492 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [205939947] [2019-11-07 01:29:55,492 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 01:29:55,493 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1314257044] [2019-11-07 01:29:55,493 INFO L218 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:29:55,493 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 6 [2019-11-07 01:29:55,494 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376440839] [2019-11-07 01:29:55,496 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-07 01:29:55,496 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:29:55,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-07 01:29:55,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-11-07 01:29:55,497 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand 6 states. [2019-11-07 01:29:55,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:29:55,631 INFO L93 Difference]: Finished difference Result 41 states and 54 transitions. [2019-11-07 01:29:55,633 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-07 01:29:55,633 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2019-11-07 01:29:55,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:29:55,634 INFO L225 Difference]: With dead ends: 41 [2019-11-07 01:29:55,635 INFO L226 Difference]: Without dead ends: 23 [2019-11-07 01:29:55,636 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-11-07 01:29:55,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-11-07 01:29:55,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2019-11-07 01:29:55,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-07 01:29:55,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2019-11-07 01:29:55,648 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 14 [2019-11-07 01:29:55,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:29:55,648 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2019-11-07 01:29:55,650 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-07 01:29:55,650 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2019-11-07 01:29:55,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-07 01:29:55,652 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:29:55,652 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:29:55,864 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:29:55,864 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:29:55,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:29:55,865 INFO L82 PathProgramCache]: Analyzing trace with hash 1307047102, now seen corresponding path program 1 times [2019-11-07 01:29:55,865 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:29:55,865 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [821170003] [2019-11-07 01:29:55,866 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:29:55,890 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 01:29:55,890 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [832051332] [2019-11-07 01:29:55,890 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 01:29:55,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:29:55,958 INFO L256 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-07 01:29:55,960 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:29:56,040 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2019-11-07 01:29:56,041 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-07 01:29:56,044 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-07 01:29:56,044 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-07 01:29:56,044 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:11, output treesize:7 [2019-11-07 01:29:56,099 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-07 01:29:56,099 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 24 [2019-11-07 01:29:56,101 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2019-11-07 01:29:56,118 INFO L567 ElimStorePlain]: treesize reduction 14, result has 41.7 percent of original size [2019-11-07 01:29:56,119 INFO L496 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-07 01:29:56,119 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:30, output treesize:10 [2019-11-07 01:29:56,157 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:29:56,157 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:29:56,294 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 24 [2019-11-07 01:29:56,306 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 45 [2019-11-07 01:29:56,309 INFO L496 ElimStorePlain]: Start of recursive call 3: 1 dim-0 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-11-07 01:29:56,328 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-07 01:29:56,329 INFO L496 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-11-07 01:29:56,356 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-07 01:29:56,356 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:29:56,357 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:29:56,363 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:29:56,365 INFO L496 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: 4 dim-0 vars, and 1 xjuncts. [2019-11-07 01:29:56,366 INFO L221 ElimStorePlain]: Needed 3 recursive calls to eliminate 5 variables, input treesize:26, output treesize:45 [2019-11-07 01:29:56,366 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:29:56,367 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:29:56,367 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:29:59,691 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:29:59,692 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:29:59,693 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 01:29:59,739 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:29:59,739 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [821170003] [2019-11-07 01:29:59,739 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 01:29:59,740 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [832051332] [2019-11-07 01:29:59,740 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [420084121] [2019-11-07 01:29:59,770 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2019-11-07 01:29:59,770 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:29:59,775 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:29:59,781 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:29:59,782 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:29:59,871 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:30:00,433 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2019-11-07 01:30:00,446 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:30:00,450 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:30:00,981 WARN L191 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 63 [2019-11-07 01:30:01,375 WARN L191 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 60 [2019-11-07 01:30:01,816 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 01:30:01,817 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 12] total 29 [2019-11-07 01:30:01,818 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382531218] [2019-11-07 01:30:01,818 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-11-07 01:30:01,818 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:30:01,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-11-07 01:30:01,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=714, Unknown=2, NotChecked=0, Total=812 [2019-11-07 01:30:01,820 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand 29 states. [2019-11-07 01:30:02,162 WARN L191 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 54 [2019-11-07 01:30:02,357 WARN L191 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 51 [2019-11-07 01:30:02,737 WARN L191 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 63 [2019-11-07 01:30:04,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:30:04,166 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2019-11-07 01:30:04,167 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-07 01:30:04,167 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 15 [2019-11-07 01:30:04,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:30:04,168 INFO L225 Difference]: With dead ends: 33 [2019-11-07 01:30:04,169 INFO L226 Difference]: Without dead ends: 31 [2019-11-07 01:30:04,172 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 419 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=281, Invalid=1697, Unknown=2, NotChecked=0, Total=1980 [2019-11-07 01:30:04,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-11-07 01:30:04,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 25. [2019-11-07 01:30:04,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-11-07 01:30:04,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2019-11-07 01:30:04,206 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 15 [2019-11-07 01:30:04,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:30:04,207 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2019-11-07 01:30:04,207 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-11-07 01:30:04,207 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2019-11-07 01:30:04,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-07 01:30:04,213 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:30:04,214 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:30:04,414 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:30:04,414 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:30:04,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:30:04,415 INFO L82 PathProgramCache]: Analyzing trace with hash 2012600320, now seen corresponding path program 1 times [2019-11-07 01:30:04,415 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:30:04,416 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [836457831] [2019-11-07 01:30:04,416 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:30:04,424 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 01:30:04,424 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [338110765] [2019-11-07 01:30:04,424 INFO L94 rtionOrderModulation]: Keeping assertion order 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 01:30:04,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:30:04,522 INFO L256 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-07 01:30:04,527 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:30:04,563 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:30:04,563 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:30:04,603 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:30:04,603 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [836457831] [2019-11-07 01:30:04,603 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 01:30:04,604 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [338110765] [2019-11-07 01:30:04,604 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1430619445] [2019-11-07 01:30:04,605 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2019-11-07 01:30:04,606 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:30:04,606 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:30:04,607 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:30:04,607 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:30:04,656 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:30:05,081 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2019-11-07 01:30:05,091 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:30:05,092 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:30:05,482 WARN L191 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 63 [2019-11-07 01:30:05,885 WARN L191 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 60 [2019-11-07 01:30:06,376 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 01:30:06,376 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 14] total 23 [2019-11-07 01:30:06,377 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698620559] [2019-11-07 01:30:06,378 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-07 01:30:06,378 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:30:06,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-07 01:30:06,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2019-11-07 01:30:06,379 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 23 states. [2019-11-07 01:30:06,673 WARN L191 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 54 [2019-11-07 01:30:06,854 WARN L191 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 51 [2019-11-07 01:30:07,143 WARN L191 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 58 [2019-11-07 01:30:07,649 WARN L191 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 58 [2019-11-07 01:30:08,122 WARN L191 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 42 [2019-11-07 01:30:08,582 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 41 [2019-11-07 01:30:09,065 WARN L191 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 48 [2019-11-07 01:30:11,484 WARN L191 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 47 [2019-11-07 01:30:19,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:30:19,635 INFO L93 Difference]: Finished difference Result 81 states and 105 transitions. [2019-11-07 01:30:19,636 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-11-07 01:30:19,636 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 22 [2019-11-07 01:30:19,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:30:19,638 INFO L225 Difference]: With dead ends: 81 [2019-11-07 01:30:19,638 INFO L226 Difference]: Without dead ends: 62 [2019-11-07 01:30:19,640 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 43 SyntacticMatches, 3 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 653 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=413, Invalid=2137, Unknown=0, NotChecked=0, Total=2550 [2019-11-07 01:30:19,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-11-07 01:30:19,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 49. [2019-11-07 01:30:19,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-11-07 01:30:19,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2019-11-07 01:30:19,657 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 22 [2019-11-07 01:30:19,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:30:19,657 INFO L462 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2019-11-07 01:30:19,657 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-07 01:30:19,657 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2019-11-07 01:30:19,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-07 01:30:19,658 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:30:19,658 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:30:19,862 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:30:19,863 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:30:19,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:30:19,863 INFO L82 PathProgramCache]: Analyzing trace with hash 665696917, now seen corresponding path program 2 times [2019-11-07 01:30:19,863 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:30:19,864 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [152530865] [2019-11-07 01:30:19,864 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:30:19,894 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 01:30:19,895 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1017832028] [2019-11-07 01:30:19,895 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 01:30:20,116 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 01:30:20,117 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:30:20,121 INFO L256 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-07 01:30:20,129 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:30:20,316 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:30:20,317 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:30:20,637 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:30:20,637 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [152530865] [2019-11-07 01:30:20,637 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 01:30:20,637 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1017832028] [2019-11-07 01:30:20,638 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [422241488] [2019-11-07 01:30:20,641 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2019-11-07 01:30:20,642 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:30:20,642 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:30:20,642 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:30:20,643 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:30:20,673 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:30:21,014 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2019-11-07 01:30:21,022 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:30:21,024 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:30:21,504 WARN L191 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 63 [2019-11-07 01:30:21,888 WARN L191 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 60 [2019-11-07 01:30:22,440 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 01:30:22,440 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 14] total 33 [2019-11-07 01:30:22,441 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011118393] [2019-11-07 01:30:22,441 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-11-07 01:30:22,442 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:30:22,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-11-07 01:30:22,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=942, Unknown=0, NotChecked=0, Total=1056 [2019-11-07 01:30:22,443 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand 33 states. [2019-11-07 01:30:22,804 WARN L191 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 54 [2019-11-07 01:30:23,050 WARN L191 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 51 [2019-11-07 01:30:23,413 WARN L191 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 59 [2019-11-07 01:30:23,721 WARN L191 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 32 [2019-11-07 01:30:24,086 WARN L191 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 65 [2019-11-07 01:30:24,311 WARN L191 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 42 [2019-11-07 01:30:24,609 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 41 [2019-11-07 01:30:24,909 WARN L191 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 47 [2019-11-07 01:30:27,349 WARN L191 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 47 [2019-11-07 01:30:28,018 WARN L191 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 52 [2019-11-07 01:30:37,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:30:37,162 INFO L93 Difference]: Finished difference Result 73 states and 92 transitions. [2019-11-07 01:30:37,163 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-11-07 01:30:37,163 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 23 [2019-11-07 01:30:37,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:30:37,167 INFO L225 Difference]: With dead ends: 73 [2019-11-07 01:30:37,167 INFO L226 Difference]: Without dead ends: 71 [2019-11-07 01:30:37,168 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 859 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=459, Invalid=3077, Unknown=4, NotChecked=0, Total=3540 [2019-11-07 01:30:37,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2019-11-07 01:30:37,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 50. [2019-11-07 01:30:37,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2019-11-07 01:30:37,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 64 transitions. [2019-11-07 01:30:37,184 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 64 transitions. Word has length 23 [2019-11-07 01:30:37,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:30:37,184 INFO L462 AbstractCegarLoop]: Abstraction has 50 states and 64 transitions. [2019-11-07 01:30:37,184 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-11-07 01:30:37,185 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 64 transitions. [2019-11-07 01:30:37,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-11-07 01:30:37,186 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:30:37,186 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:30:37,397 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:30:37,397 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:30:37,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:30:37,398 INFO L82 PathProgramCache]: Analyzing trace with hash -302351121, now seen corresponding path program 1 times [2019-11-07 01:30:37,398 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:30:37,398 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1304040913] [2019-11-07 01:30:37,399 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:30:37,405 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 01:30:37,405 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1182908047] [2019-11-07 01:30:37,405 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 01:30:37,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:30:37,459 INFO L256 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-07 01:30:37,462 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:30:37,483 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 01:30:37,483 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:30:37,507 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 01:30:37,508 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1304040913] [2019-11-07 01:30:37,508 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 01:30:37,508 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1182908047] [2019-11-07 01:30:37,508 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [91170781] [2019-11-07 01:30:37,511 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2019-11-07 01:30:37,511 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:30:37,511 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:30:37,514 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:30:37,514 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:30:37,530 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:30:37,842 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2019-11-07 01:30:37,850 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:30:37,852 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:30:38,240 WARN L191 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 63 [2019-11-07 01:30:38,767 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 01:30:38,767 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 13] total 21 [2019-11-07 01:30:38,767 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525527389] [2019-11-07 01:30:38,768 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-07 01:30:38,768 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:30:38,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-07 01:30:38,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2019-11-07 01:30:38,769 INFO L87 Difference]: Start difference. First operand 50 states and 64 transitions. Second operand 21 states. [2019-11-07 01:30:39,014 WARN L191 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 52 [2019-11-07 01:30:39,237 WARN L191 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 51