/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/nla-digbench/egcd2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 04:04:18,149 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 04:04:18,152 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 04:04:18,165 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-07 04:04:18,166 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-07 04:04:18,167 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-07 04:04:18,169 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-07 04:04:18,172 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-07 04:04:18,177 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-07 04:04:18,177 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-07 04:04:18,178 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-07 04:04:18,179 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-07 04:04:18,186 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 04:04:18,187 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 04:04:18,190 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 04:04:18,192 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 04:04:18,192 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 04:04:18,195 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 04:04:18,198 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 04:04:18,199 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 04:04:18,202 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 04:04:18,204 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 04:04:18,205 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 04:04:18,205 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 04:04:18,209 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-07 04:04:18,210 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-07 04:04:18,210 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-07 04:04:18,211 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-07 04:04:18,211 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-07 04:04:18,212 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-07 04:04:18,212 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-07 04:04:18,213 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-07 04:04:18,214 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-07 04:04:18,215 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-07 04:04:18,216 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-07 04:04:18,216 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-07 04:04:18,216 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-07 04:04:18,217 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-07 04:04:18,217 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 04:04:18,218 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 04:04:18,218 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 04:04:18,219 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 04:04:18,232 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 04:04:18,232 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 04:04:18,233 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 04:04:18,234 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 04:04:18,234 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 04:04:18,234 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 04:04:18,234 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 04:04:18,234 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 04:04:18,235 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 04:04:18,235 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 04:04:18,235 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 04:04:18,235 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 04:04:18,235 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 04:04:18,236 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 04:04:18,236 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 04:04:18,236 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 04:04:18,236 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 04:04:18,236 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 04:04:18,236 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 04:04:18,237 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 04:04:18,237 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 04:04:18,237 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 04:04:18,237 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 04:04:18,237 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 04:04:18,238 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 04:04:18,238 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 04:04:18,238 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 04:04:18,238 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 04:04:18,238 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 04:04:18,673 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 04:04:18,688 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 04:04:18,693 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 04:04:18,695 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 04:04:18,696 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 04:04:18,696 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/egcd2.c [2019-11-07 04:04:18,774 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2f63f82ce/200f0324a73a4838bba427fb6630e7de/FLAG37d0d44f9 [2019-11-07 04:04:19,237 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 04:04:19,237 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/egcd2.c [2019-11-07 04:04:19,250 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2f63f82ce/200f0324a73a4838bba427fb6630e7de/FLAG37d0d44f9 [2019-11-07 04:04:19,623 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2f63f82ce/200f0324a73a4838bba427fb6630e7de [2019-11-07 04:04:19,634 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 04:04:19,636 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 04:04:19,637 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 04:04:19,637 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 04:04:19,641 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 04:04:19,642 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:04:19" (1/1) ... [2019-11-07 04:04:19,645 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@288ad380 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:04:19, skipping insertion in model container [2019-11-07 04:04:19,645 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:04:19" (1/1) ... [2019-11-07 04:04:19,653 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 04:04:19,673 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 04:04:19,841 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 04:04:19,844 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 04:04:19,863 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 04:04:19,878 INFO L192 MainTranslator]: Completed translation [2019-11-07 04:04:19,878 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:04:19 WrapperNode [2019-11-07 04:04:19,878 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 04:04:19,879 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 04:04:19,879 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 04:04:19,879 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 04:04:19,971 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:04:19" (1/1) ... [2019-11-07 04:04:19,971 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:04:19" (1/1) ... [2019-11-07 04:04:19,977 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:04:19" (1/1) ... [2019-11-07 04:04:19,977 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:04:19" (1/1) ... [2019-11-07 04:04:19,982 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:04:19" (1/1) ... [2019-11-07 04:04:19,988 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:04:19" (1/1) ... [2019-11-07 04:04:19,992 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:04:19" (1/1) ... [2019-11-07 04:04:19,994 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 04:04:19,996 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 04:04:19,996 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 04:04:19,997 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 04:04:19,998 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:04:19" (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 04:04:20,055 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 04:04:20,055 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 04:04:20,055 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 04:04:20,055 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 04:04:20,055 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 04:04:20,056 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 04:04:20,056 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-11-07 04:04:20,056 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 04:04:20,056 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 04:04:20,056 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 04:04:20,056 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 04:04:20,313 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 04:04:20,313 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-11-07 04:04:20,315 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:04:20 BoogieIcfgContainer [2019-11-07 04:04:20,315 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 04:04:20,324 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 04:04:20,324 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 04:04:20,331 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 04:04:20,331 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 04:04:19" (1/3) ... [2019-11-07 04:04:20,332 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8671a04 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:04:20, skipping insertion in model container [2019-11-07 04:04:20,333 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:04:19" (2/3) ... [2019-11-07 04:04:20,336 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8671a04 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:04:20, skipping insertion in model container [2019-11-07 04:04:20,336 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:04:20" (3/3) ... [2019-11-07 04:04:20,338 INFO L109 eAbstractionObserver]: Analyzing ICFG egcd2.c [2019-11-07 04:04:20,365 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 04:04:20,382 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 04:04:20,396 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 04:04:20,422 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 04:04:20,423 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 04:04:20,423 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 04:04:20,423 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 04:04:20,423 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 04:04:20,423 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 04:04:20,423 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 04:04:20,424 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 04:04:20,444 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2019-11-07 04:04:20,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-07 04:04:20,448 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:04:20,449 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:04:20,451 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:04:20,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:04:20,456 INFO L82 PathProgramCache]: Analyzing trace with hash -526924454, now seen corresponding path program 1 times [2019-11-07 04:04:20,466 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:04:20,466 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [766960257] [2019-11-07 04:04:20,466 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:04:20,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:04:20,581 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 04:04:20,581 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [766960257] [2019-11-07 04:04:20,582 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 04:04:20,583 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-07 04:04:20,584 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213798109] [2019-11-07 04:04:20,588 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-11-07 04:04:20,589 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:04:20,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-11-07 04:04:20,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-07 04:04:20,606 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 2 states. [2019-11-07 04:04:20,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:04:20,634 INFO L93 Difference]: Finished difference Result 47 states and 71 transitions. [2019-11-07 04:04:20,634 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-11-07 04:04:20,636 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2019-11-07 04:04:20,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:04:20,646 INFO L225 Difference]: With dead ends: 47 [2019-11-07 04:04:20,647 INFO L226 Difference]: Without dead ends: 22 [2019-11-07 04:04:20,651 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 04:04:20,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-07 04:04:20,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-11-07 04:04:20,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-11-07 04:04:20,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 28 transitions. [2019-11-07 04:04:20,698 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 28 transitions. Word has length 10 [2019-11-07 04:04:20,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:04:20,699 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 28 transitions. [2019-11-07 04:04:20,699 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-11-07 04:04:20,699 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 28 transitions. [2019-11-07 04:04:20,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-11-07 04:04:20,700 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:04:20,700 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:04:20,701 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:04:20,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:04:20,701 INFO L82 PathProgramCache]: Analyzing trace with hash -1008536757, now seen corresponding path program 1 times [2019-11-07 04:04:20,702 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:04:20,702 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1989217855] [2019-11-07 04:04:20,702 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:04:20,714 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 04:04:20,714 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [799645807] [2019-11-07 04:04:20,714 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 04:04:20,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:04:20,777 INFO L256 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 04:04:20,782 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:04:20,818 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 04:04:20,818 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:04:20,851 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 04:04:20,852 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1989217855] [2019-11-07 04:04:20,852 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 04:04:20,852 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [799645807] [2019-11-07 04:04:20,853 INFO L218 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-07 04:04:20,853 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2019-11-07 04:04:20,853 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1266557334] [2019-11-07 04:04:20,855 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 04:04:20,855 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:04:20,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 04:04:20,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 04:04:20,856 INFO L87 Difference]: Start difference. First operand 22 states and 28 transitions. Second operand 3 states. [2019-11-07 04:04:20,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:04:20,892 INFO L93 Difference]: Finished difference Result 39 states and 51 transitions. [2019-11-07 04:04:20,892 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 04:04:20,892 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2019-11-07 04:04:20,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:04:20,894 INFO L225 Difference]: With dead ends: 39 [2019-11-07 04:04:20,894 INFO L226 Difference]: Without dead ends: 31 [2019-11-07 04:04:20,895 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 19 SyntacticMatches, 1 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 04:04:20,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-11-07 04:04:20,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 24. [2019-11-07 04:04:20,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-07 04:04:20,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 30 transitions. [2019-11-07 04:04:20,906 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 30 transitions. Word has length 11 [2019-11-07 04:04:20,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:04:20,907 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 30 transitions. [2019-11-07 04:04:20,907 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 04:04:20,907 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 30 transitions. [2019-11-07 04:04:20,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-07 04:04:20,908 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:04:20,908 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:04:21,112 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:04:21,112 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:04:21,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:04:21,113 INFO L82 PathProgramCache]: Analyzing trace with hash -1182801044, now seen corresponding path program 1 times [2019-11-07 04:04:21,113 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:04:21,113 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [605573327] [2019-11-07 04:04:21,118 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:04:21,153 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 04:04:21,153 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1365003727] [2019-11-07 04:04:21,153 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 04:04:21,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:04:21,218 INFO L256 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-07 04:04:21,220 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:04:21,259 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 04:04:21,259 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:04:21,307 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 04:04:21,308 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [605573327] [2019-11-07 04:04:21,308 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 04:04:21,308 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1365003727] [2019-11-07 04:04:21,308 INFO L218 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-07 04:04:21,309 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 7 [2019-11-07 04:04:21,309 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378697001] [2019-11-07 04:04:21,309 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-07 04:04:21,310 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:04:21,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-07 04:04:21,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2019-11-07 04:04:21,311 INFO L87 Difference]: Start difference. First operand 24 states and 30 transitions. Second operand 7 states. [2019-11-07 04:04:21,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:04:21,409 INFO L93 Difference]: Finished difference Result 37 states and 47 transitions. [2019-11-07 04:04:21,410 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-07 04:04:21,410 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2019-11-07 04:04:21,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:04:21,411 INFO L225 Difference]: With dead ends: 37 [2019-11-07 04:04:21,412 INFO L226 Difference]: Without dead ends: 35 [2019-11-07 04:04:21,412 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-11-07 04:04:21,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-11-07 04:04:21,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2019-11-07 04:04:21,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-11-07 04:04:21,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2019-11-07 04:04:21,422 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 12 [2019-11-07 04:04:21,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:04:21,423 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2019-11-07 04:04:21,423 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-07 04:04:21,423 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2019-11-07 04:04:21,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-07 04:04:21,424 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:04:21,424 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:04:21,627 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:04:21,627 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:04:21,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:04:21,628 INFO L82 PathProgramCache]: Analyzing trace with hash -2031293851, now seen corresponding path program 1 times [2019-11-07 04:04:21,629 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:04:21,629 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1326842664] [2019-11-07 04:04:21,630 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:04:21,643 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 04:04:21,643 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [745839810] [2019-11-07 04:04:21,643 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 04:04:21,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:04:21,687 INFO L256 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-07 04:04:21,689 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:04:21,735 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:04:21,736 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:04:21,803 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:04:21,804 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1326842664] [2019-11-07 04:04:21,805 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 04:04:21,805 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [745839810] [2019-11-07 04:04:21,805 INFO L218 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-07 04:04:21,806 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 8 [2019-11-07 04:04:21,806 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037445555] [2019-11-07 04:04:21,806 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-07 04:04:21,809 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:04:21,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-07 04:04:21,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2019-11-07 04:04:21,810 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand 8 states. [2019-11-07 04:04:21,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:04:21,898 INFO L93 Difference]: Finished difference Result 45 states and 56 transitions. [2019-11-07 04:04:21,899 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-07 04:04:21,899 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2019-11-07 04:04:21,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:04:21,911 INFO L225 Difference]: With dead ends: 45 [2019-11-07 04:04:21,912 INFO L226 Difference]: Without dead ends: 43 [2019-11-07 04:04:21,912 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-11-07 04:04:21,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-11-07 04:04:21,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2019-11-07 04:04:21,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-11-07 04:04:21,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 53 transitions. [2019-11-07 04:04:21,934 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 53 transitions. Word has length 17 [2019-11-07 04:04:21,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:04:21,934 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 53 transitions. [2019-11-07 04:04:21,934 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-07 04:04:21,934 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 53 transitions. [2019-11-07 04:04:21,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-07 04:04:21,935 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:04:21,935 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:04:22,141 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:04:22,144 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:04:22,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:04:22,145 INFO L82 PathProgramCache]: Analyzing trace with hash -71864628, now seen corresponding path program 1 times [2019-11-07 04:04:22,145 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:04:22,146 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [580674901] [2019-11-07 04:04:22,146 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:04:22,157 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 04:04:22,158 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1554053122] [2019-11-07 04:04:22,158 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 04:04:22,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:04:22,185 INFO L256 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-07 04:04:22,187 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:04:22,250 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 04:04:22,251 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:04:22,299 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 04:04:22,300 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [580674901] [2019-11-07 04:04:22,300 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 04:04:22,300 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1554053122] [2019-11-07 04:04:22,300 INFO L218 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-07 04:04:22,301 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 8 [2019-11-07 04:04:22,301 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698112780] [2019-11-07 04:04:22,301 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-07 04:04:22,302 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:04:22,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-07 04:04:22,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2019-11-07 04:04:22,302 INFO L87 Difference]: Start difference. First operand 42 states and 53 transitions. Second operand 8 states. [2019-11-07 04:04:22,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:04:22,379 INFO L93 Difference]: Finished difference Result 49 states and 59 transitions. [2019-11-07 04:04:22,380 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-07 04:04:22,380 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2019-11-07 04:04:22,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:04:22,381 INFO L225 Difference]: With dead ends: 49 [2019-11-07 04:04:22,381 INFO L226 Difference]: Without dead ends: 47 [2019-11-07 04:04:22,382 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-11-07 04:04:22,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-11-07 04:04:22,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2019-11-07 04:04:22,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-11-07 04:04:22,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 56 transitions. [2019-11-07 04:04:22,393 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 56 transitions. Word has length 22 [2019-11-07 04:04:22,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:04:22,393 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 56 transitions. [2019-11-07 04:04:22,393 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-07 04:04:22,395 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 56 transitions. [2019-11-07 04:04:22,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-11-07 04:04:22,396 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:04:22,396 INFO L410 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:04:22,597 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:04:22,597 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:04:22,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:04:22,598 INFO L82 PathProgramCache]: Analyzing trace with hash 954332139, now seen corresponding path program 1 times [2019-11-07 04:04:22,598 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:04:22,599 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [852909029] [2019-11-07 04:04:22,599 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:04:22,624 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 04:04:22,624 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1837218807] [2019-11-07 04:04:22,628 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:04:22,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:04:22,717 INFO L256 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-07 04:04:22,724 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:04:22,780 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-11-07 04:04:22,781 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:04:22,856 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-11-07 04:04:22,856 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [852909029] [2019-11-07 04:04:22,856 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 04:04:22,856 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1837218807] [2019-11-07 04:04:22,857 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [713984602] [2019-11-07 04:04:22,908 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-11-07 04:04:22,909 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:04:22,919 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:04:22,927 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:04:22,928 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:04:22,995 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 1 for LOIs [2019-11-07 04:04:24,989 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2019-11-07 04:04:24,995 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 1 for LOIs [2019-11-07 04:04:24,996 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:04:25,447 WARN L191 SmtUtils]: Spent 311.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 48 [2019-11-07 04:04:25,806 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 04:04:25,806 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 9] total 17 [2019-11-07 04:04:25,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2022853215] [2019-11-07 04:04:25,808 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-07 04:04:25,809 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:04:25,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-07 04:04:25,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2019-11-07 04:04:25,809 INFO L87 Difference]: Start difference. First operand 46 states and 56 transitions. Second operand 17 states. [2019-11-07 04:04:26,173 WARN L191 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 36 [2019-11-07 04:04:31,334 WARN L191 SmtUtils]: Spent 4.99 s on a formula simplification. DAG size of input: 51 DAG size of output: 47 [2019-11-07 04:04:33,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:04:33,692 INFO L93 Difference]: Finished difference Result 77 states and 105 transitions. [2019-11-07 04:04:33,693 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-07 04:04:33,693 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 34 [2019-11-07 04:04:33,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:04:33,695 INFO L225 Difference]: With dead ends: 77 [2019-11-07 04:04:33,695 INFO L226 Difference]: Without dead ends: 75 [2019-11-07 04:04:33,696 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 84 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2019-11-07 04:04:33,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2019-11-07 04:04:33,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 48. [2019-11-07 04:04:33,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-11-07 04:04:33,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 58 transitions. [2019-11-07 04:04:33,709 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 58 transitions. Word has length 34 [2019-11-07 04:04:33,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:04:33,710 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 58 transitions. [2019-11-07 04:04:33,710 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-07 04:04:33,710 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 58 transitions. [2019-11-07 04:04:33,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-11-07 04:04:33,711 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:04:33,712 INFO L410 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:04:33,916 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:04:33,916 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:04:33,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:04:33,917 INFO L82 PathProgramCache]: Analyzing trace with hash 286726549, now seen corresponding path program 1 times [2019-11-07 04:04:33,917 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:04:33,917 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1365351951] [2019-11-07 04:04:33,917 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:04:33,942 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 04:04:33,943 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1907761196] [2019-11-07 04:04:33,943 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 04:04:34,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:04:34,001 INFO L256 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-07 04:04:34,003 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:04:34,033 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-11-07 04:04:34,033 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:04:34,062 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-11-07 04:04:34,062 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1365351951] [2019-11-07 04:04:34,062 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 04:04:34,063 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1907761196] [2019-11-07 04:04:34,063 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1421157940] [2019-11-07 04:04:34,064 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2019-11-07 04:04:34,065 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:04:34,065 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:04:34,065 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:04:34,066 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:04:34,072 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 1 for LOIs [2019-11-07 04:04:35,156 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2019-11-07 04:04:35,174 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 1 for LOIs [2019-11-07 04:04:35,174 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:04:35,560 WARN L191 SmtUtils]: Spent 329.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 56 [2019-11-07 04:04:35,802 WARN L191 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 44 [2019-11-07 04:04:36,224 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 37 [2019-11-07 04:04:36,404 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 34 [2019-11-07 04:04:36,405 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 04:04:36,405 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 12] total 15 [2019-11-07 04:04:36,406 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384893420] [2019-11-07 04:04:36,407 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-07 04:04:36,407 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:04:36,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-07 04:04:36,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2019-11-07 04:04:36,408 INFO L87 Difference]: Start difference. First operand 48 states and 58 transitions. Second operand 15 states. [2019-11-07 04:04:40,922 WARN L191 SmtUtils]: Spent 4.36 s on a formula simplification. DAG size of input: 67 DAG size of output: 39 [2019-11-07 04:04:41,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:04:41,287 INFO L93 Difference]: Finished difference Result 102 states and 145 transitions. [2019-11-07 04:04:41,288 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-07 04:04:41,288 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 36 [2019-11-07 04:04:41,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:04:41,291 INFO L225 Difference]: With dead ends: 102 [2019-11-07 04:04:41,291 INFO L226 Difference]: Without dead ends: 94 [2019-11-07 04:04:41,292 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 90 SyntacticMatches, 4 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=100, Invalid=242, Unknown=0, NotChecked=0, Total=342 [2019-11-07 04:04:41,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2019-11-07 04:04:41,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 76. [2019-11-07 04:04:41,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-11-07 04:04:41,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 106 transitions. [2019-11-07 04:04:41,310 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 106 transitions. Word has length 36 [2019-11-07 04:04:41,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:04:41,310 INFO L462 AbstractCegarLoop]: Abstraction has 76 states and 106 transitions. [2019-11-07 04:04:41,311 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-07 04:04:41,311 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 106 transitions. [2019-11-07 04:04:41,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-11-07 04:04:41,312 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:04:41,312 INFO L410 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:04:41,526 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:04:41,527 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:04:41,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:04:41,527 INFO L82 PathProgramCache]: Analyzing trace with hash -1803964113, now seen corresponding path program 1 times [2019-11-07 04:04:41,527 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:04:41,527 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1479612657] [2019-11-07 04:04:41,528 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:04:41,543 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 04:04:41,543 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [596149017] [2019-11-07 04:04:41,544 INFO L94 rtionOrderModulation]: Keeping assertion order 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 04:04:41,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:04:41,605 INFO L256 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-07 04:04:41,608 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:04:41,663 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2019-11-07 04:04:41,664 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:04:41,736 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2019-11-07 04:04:41,736 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1479612657] [2019-11-07 04:04:41,736 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 04:04:41,736 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [596149017] [2019-11-07 04:04:41,737 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1947745458] [2019-11-07 04:04:41,738 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-11-07 04:04:41,738 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:04:41,739 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:04:41,739 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:04:41,739 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:04:41,745 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 1 for LOIs [2019-11-07 04:04:42,539 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2019-11-07 04:04:42,544 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 1 for LOIs [2019-11-07 04:04:42,545 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:04:42,864 WARN L191 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 53 [2019-11-07 04:04:43,123 WARN L191 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 43 [2019-11-07 04:04:43,674 WARN L191 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 34 [2019-11-07 04:04:43,675 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 04:04:43,676 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 11] total 20 [2019-11-07 04:04:43,676 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901960569] [2019-11-07 04:04:43,677 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-07 04:04:43,677 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:04:43,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-07 04:04:43,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=312, Unknown=0, NotChecked=0, Total=380 [2019-11-07 04:04:43,678 INFO L87 Difference]: Start difference. First operand 76 states and 106 transitions. Second operand 20 states. [2019-11-07 04:04:44,223 WARN L191 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 34 [2019-11-07 04:04:47,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:04:47,026 INFO L93 Difference]: Finished difference Result 166 states and 243 transitions. [2019-11-07 04:04:47,026 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-07 04:04:47,026 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2019-11-07 04:04:47,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:04:47,028 INFO L225 Difference]: With dead ends: 166 [2019-11-07 04:04:47,028 INFO L226 Difference]: Without dead ends: 115 [2019-11-07 04:04:47,030 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 106 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=129, Invalid=573, Unknown=0, NotChecked=0, Total=702 [2019-11-07 04:04:47,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2019-11-07 04:04:47,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 86. [2019-11-07 04:04:47,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2019-11-07 04:04:47,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 121 transitions. [2019-11-07 04:04:47,053 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 121 transitions. Word has length 42 [2019-11-07 04:04:47,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:04:47,054 INFO L462 AbstractCegarLoop]: Abstraction has 86 states and 121 transitions. [2019-11-07 04:04:47,054 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-07 04:04:47,054 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 121 transitions. [2019-11-07 04:04:47,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-11-07 04:04:47,057 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:04:47,057 INFO L410 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:04:47,260 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:04:47,261 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:04:47,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:04:47,262 INFO L82 PathProgramCache]: Analyzing trace with hash -1556128492, now seen corresponding path program 1 times [2019-11-07 04:04:47,262 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:04:47,262 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [667700585] [2019-11-07 04:04:47,263 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:04:47,268 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 04:04:47,268 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1997601565] [2019-11-07 04:04:47,269 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:04:47,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:04:47,334 INFO L256 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 37 conjunts are in the unsatisfiable core [2019-11-07 04:04:47,337 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:04:47,442 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-11-07 04:04:47,442 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:04:47,622 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-11-07 04:04:47,622 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [667700585] [2019-11-07 04:04:47,622 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 04:04:47,623 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1997601565] [2019-11-07 04:04:47,623 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1656998493] [2019-11-07 04:04:47,624 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2019-11-07 04:04:47,625 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:04:47,625 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:04:47,625 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:04:47,625 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:04:47,632 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 1 for LOIs [2019-11-07 04:04:52,368 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2019-11-07 04:04:52,373 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 1 for LOIs [2019-11-07 04:04:52,374 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:04:53,745 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 04:04:53,745 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 11] total 26 [2019-11-07 04:04:53,745 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525588704] [2019-11-07 04:04:53,747 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-11-07 04:04:53,747 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:04:53,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-11-07 04:04:53,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=567, Unknown=0, NotChecked=0, Total=650 [2019-11-07 04:04:53,748 INFO L87 Difference]: Start difference. First operand 86 states and 121 transitions. Second operand 26 states. [2019-11-07 04:04:54,787 WARN L191 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 30 [2019-11-07 04:04:56,349 WARN L191 SmtUtils]: Spent 1.41 s on a formula simplification. DAG size of input: 104 DAG size of output: 103 [2019-11-07 04:04:58,650 WARN L191 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2019-11-07 04:04:59,164 WARN L191 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 29 [2019-11-07 04:05:00,734 WARN L191 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 35