/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-3-u.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:29:50,522 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 01:29:50,525 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 01:29:50,544 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-07 01:29:50,545 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-07 01:29:50,547 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-07 01:29:50,549 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-07 01:29:50,561 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-07 01:29:50,562 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-07 01:29:50,565 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-07 01:29:50,566 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-07 01:29:50,567 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-07 01:29:50,567 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 01:29:50,568 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 01:29:50,569 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 01:29:50,570 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 01:29:50,571 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 01:29:50,572 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 01:29:50,574 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 01:29:50,578 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 01:29:50,581 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 01:29:50,582 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 01:29:50,583 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 01:29:50,585 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 01:29:50,589 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 01:29:50,604 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:29:50,607 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:29:50,607 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:29:50,608 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 01:29:50,626 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:29:50,626 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:29:50,628 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:29:50,628 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:29:50,628 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:29:50,628 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:29:50,631 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:29:50,631 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:29:50,631 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:29:50,631 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:29:50,631 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:29:50,632 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:29:50,632 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:29:50,632 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:29:50,632 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:29:50,632 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:29:50,633 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:29:50,634 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:29:50,634 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:29:50,634 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:29:50,634 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:29:50,634 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:29:50,634 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:29:50,635 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:29:50,635 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:29:50,635 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:29:50,635 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:29:50,635 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:29:50,636 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 01:29:50,947 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:29:50,960 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:29:50,963 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:29:50,965 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:29:50,965 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:29:50,966 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-multidimensional/init-3-u.c [2019-11-07 01:29:51,027 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/47d1d350c/990cf41d340043908756c010e9a2a26a/FLAGdec76b0f5 [2019-11-07 01:29:51,468 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:29:51,471 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-multidimensional/init-3-u.c [2019-11-07 01:29:51,478 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/47d1d350c/990cf41d340043908756c010e9a2a26a/FLAGdec76b0f5 [2019-11-07 01:29:51,866 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/47d1d350c/990cf41d340043908756c010e9a2a26a [2019-11-07 01:29:51,876 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:29:51,878 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:29:51,879 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:29:51,879 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:29:51,882 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:29:51,883 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:29:51" (1/1) ... [2019-11-07 01:29:51,886 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@630fa84f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:51, skipping insertion in model container [2019-11-07 01:29:51,886 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:29:51" (1/1) ... [2019-11-07 01:29:51,894 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:29:51,912 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:29:52,089 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:29:52,093 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:29:52,116 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:29:52,134 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:29:52,134 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:52 WrapperNode [2019-11-07 01:29:52,135 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:29:52,135 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:29:52,135 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:29:52,135 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:29:52,225 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:52" (1/1) ... [2019-11-07 01:29:52,226 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:52" (1/1) ... [2019-11-07 01:29:52,232 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:52" (1/1) ... [2019-11-07 01:29:52,232 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:52" (1/1) ... [2019-11-07 01:29:52,240 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:52" (1/1) ... [2019-11-07 01:29:52,249 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:52" (1/1) ... [2019-11-07 01:29:52,251 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:52" (1/1) ... [2019-11-07 01:29:52,253 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:29:52,254 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:29:52,254 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:29:52,254 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:29:52,255 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:52" (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 01:29:52,312 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:29:52,312 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:29:52,312 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 01:29:52,312 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:29:52,313 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:29:52,313 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 01:29:52,313 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 01:29:52,313 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:29:52,313 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 01:29:52,313 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:29:52,314 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:29:52,314 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:29:52,314 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:29:52,314 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:29:52,675 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:29:52,676 INFO L284 CfgBuilder]: Removed 6 assume(true) statements. [2019-11-07 01:29:52,677 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:29:52 BoogieIcfgContainer [2019-11-07 01:29:52,677 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:29:52,678 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:29:52,679 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:29:52,689 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:29:52,693 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:29:51" (1/3) ... [2019-11-07 01:29:52,694 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38690cb0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:29:52, skipping insertion in model container [2019-11-07 01:29:52,694 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:29:52" (2/3) ... [2019-11-07 01:29:52,695 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38690cb0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:29:52, skipping insertion in model container [2019-11-07 01:29:52,695 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:29:52" (3/3) ... [2019-11-07 01:29:52,697 INFO L109 eAbstractionObserver]: Analyzing ICFG init-3-u.c [2019-11-07 01:29:52,707 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:29:52,715 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:29:52,726 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:29:52,747 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:29:52,747 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:29:52,747 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:29:52,747 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:29:52,747 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:29:52,747 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:29:52,748 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:29:52,748 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:29:52,761 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2019-11-07 01:29:52,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-07 01:29:52,766 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:29:52,766 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:29:52,768 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:29:52,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:29:52,773 INFO L82 PathProgramCache]: Analyzing trace with hash 304177849, now seen corresponding path program 1 times [2019-11-07 01:29:52,780 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:29:52,781 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1769777554] [2019-11-07 01:29:52,781 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:29:52,862 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 01:29:52,863 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1860170738] [2019-11-07 01:29:52,863 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 01:29:52,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:29:52,948 INFO L256 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 01:29:52,954 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:29:53,018 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 01:29:53,018 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:29:53,058 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 01:29:53,058 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1769777554] [2019-11-07 01:29:53,061 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 01:29:53,061 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1860170738] [2019-11-07 01:29:53,062 INFO L218 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:29:53,062 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2019-11-07 01:29:53,063 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111719512] [2019-11-07 01:29:53,070 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-07 01:29:53,070 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:29:53,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-07 01:29:53,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-07 01:29:53,091 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 4 states. [2019-11-07 01:29:53,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:29:53,199 INFO L93 Difference]: Finished difference Result 40 states and 54 transitions. [2019-11-07 01:29:53,200 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-07 01:29:53,201 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2019-11-07 01:29:53,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:29:53,210 INFO L225 Difference]: With dead ends: 40 [2019-11-07 01:29:53,210 INFO L226 Difference]: Without dead ends: 23 [2019-11-07 01:29:53,214 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-07 01:29:53,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-11-07 01:29:53,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2019-11-07 01:29:53,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-11-07 01:29:53,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 30 transitions. [2019-11-07 01:29:53,249 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 30 transitions. Word has length 13 [2019-11-07 01:29:53,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:29:53,249 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 30 transitions. [2019-11-07 01:29:53,250 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-07 01:29:53,250 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 30 transitions. [2019-11-07 01:29:53,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-07 01:29:53,251 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:29:53,251 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:29:53,454 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:29:53,455 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:29:53,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:29:53,456 INFO L82 PathProgramCache]: Analyzing trace with hash 362677943, now seen corresponding path program 1 times [2019-11-07 01:29:53,457 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:29:53,458 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1040371759] [2019-11-07 01:29:53,458 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:29:53,474 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 01:29:53,474 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [228983752] [2019-11-07 01:29:53,474 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 01:29:53,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:29:53,539 INFO L256 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 01:29:53,542 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:29:53,570 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:29:53,570 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:29:53,598 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:29:53,599 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1040371759] [2019-11-07 01:29:53,599 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 01:29:53,600 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [228983752] [2019-11-07 01:29:53,600 INFO L218 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:29:53,600 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2019-11-07 01:29:53,601 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [746097259] [2019-11-07 01:29:53,603 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-07 01:29:53,603 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:29:53,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-07 01:29:53,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-11-07 01:29:53,605 INFO L87 Difference]: Start difference. First operand 23 states and 30 transitions. Second operand 6 states. [2019-11-07 01:29:53,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:29:53,724 INFO L93 Difference]: Finished difference Result 50 states and 72 transitions. [2019-11-07 01:29:53,725 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-07 01:29:53,725 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2019-11-07 01:29:53,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:29:53,728 INFO L225 Difference]: With dead ends: 50 [2019-11-07 01:29:53,728 INFO L226 Difference]: Without dead ends: 35 [2019-11-07 01:29:53,729 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2019-11-07 01:29:53,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-11-07 01:29:53,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2019-11-07 01:29:53,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-11-07 01:29:53,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 45 transitions. [2019-11-07 01:29:53,744 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 45 transitions. Word has length 17 [2019-11-07 01:29:53,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:29:53,745 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 45 transitions. [2019-11-07 01:29:53,745 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-07 01:29:53,745 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 45 transitions. [2019-11-07 01:29:53,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-07 01:29:53,747 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:29:53,747 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:29:53,950 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:29:53,950 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:29:53,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:29:53,951 INFO L82 PathProgramCache]: Analyzing trace with hash 421607751, now seen corresponding path program 1 times [2019-11-07 01:29:53,951 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:29:53,952 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [229105240] [2019-11-07 01:29:53,952 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:29:53,973 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 01:29:53,974 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [406015220] [2019-11-07 01:29:53,974 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 01:29:54,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:29:54,031 INFO L256 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 01:29:54,034 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:29:54,055 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2019-11-07 01:29:54,055 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:29:54,090 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2019-11-07 01:29:54,091 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [229105240] [2019-11-07 01:29:54,091 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 01:29:54,091 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [406015220] [2019-11-07 01:29:54,091 INFO L218 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:29:54,092 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2019-11-07 01:29:54,092 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981455805] [2019-11-07 01:29:54,092 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-07 01:29:54,093 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:29:54,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-07 01:29:54,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-11-07 01:29:54,093 INFO L87 Difference]: Start difference. First operand 34 states and 45 transitions. Second operand 6 states. [2019-11-07 01:29:54,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:29:54,193 INFO L93 Difference]: Finished difference Result 77 states and 112 transitions. [2019-11-07 01:29:54,195 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-07 01:29:54,195 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 25 [2019-11-07 01:29:54,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:29:54,196 INFO L225 Difference]: With dead ends: 77 [2019-11-07 01:29:54,196 INFO L226 Difference]: Without dead ends: 51 [2019-11-07 01:29:54,197 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2019-11-07 01:29:54,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2019-11-07 01:29:54,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2019-11-07 01:29:54,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2019-11-07 01:29:54,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 63 transitions. [2019-11-07 01:29:54,225 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 63 transitions. Word has length 25 [2019-11-07 01:29:54,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:29:54,225 INFO L462 AbstractCegarLoop]: Abstraction has 50 states and 63 transitions. [2019-11-07 01:29:54,226 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-07 01:29:54,226 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 63 transitions. [2019-11-07 01:29:54,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-11-07 01:29:54,228 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:29:54,228 INFO L410 BasicCegarLoop]: trace histogram [8, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:29:54,432 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:29:54,433 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:29:54,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:29:54,433 INFO L82 PathProgramCache]: Analyzing trace with hash 2016507335, now seen corresponding path program 1 times [2019-11-07 01:29:54,433 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:29:54,434 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1757365448] [2019-11-07 01:29:54,434 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:29:54,470 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 01:29:54,470 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1802423159] [2019-11-07 01:29:54,470 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 01:29:54,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:29:54,576 INFO L256 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-07 01:29:54,580 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:29:54,641 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 34 proven. 3 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2019-11-07 01:29:54,641 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:29:54,686 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 34 proven. 3 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2019-11-07 01:29:54,687 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1757365448] [2019-11-07 01:29:54,687 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 01:29:54,687 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1802423159] [2019-11-07 01:29:54,688 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1006907246] [2019-11-07 01:29:54,711 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:29:54,712 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:29:54,717 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:29:54,723 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:29:54,724 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:29:54,968 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:29:56,247 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs [2019-11-07 01:29:56,256 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:29:56,260 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:29:56,685 WARN L191 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 39 [2019-11-07 01:29:57,030 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 01:29:57,030 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 12] total 22 [2019-11-07 01:29:57,031 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025352090] [2019-11-07 01:29:57,032 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-11-07 01:29:57,032 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:29:57,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-11-07 01:29:57,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=361, Unknown=0, NotChecked=0, Total=462 [2019-11-07 01:29:57,034 INFO L87 Difference]: Start difference. First operand 50 states and 63 transitions. Second operand 22 states. [2019-11-07 01:29:57,804 WARN L191 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 42 [2019-11-07 01:29:58,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:29:58,649 INFO L93 Difference]: Finished difference Result 141 states and 198 transitions. [2019-11-07 01:29:58,649 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-07 01:29:58,650 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 33 [2019-11-07 01:29:58,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:29:58,651 INFO L225 Difference]: With dead ends: 141 [2019-11-07 01:29:58,651 INFO L226 Difference]: Without dead ends: 101 [2019-11-07 01:29:58,653 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 77 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=326, Invalid=1080, Unknown=0, NotChecked=0, Total=1406 [2019-11-07 01:29:58,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2019-11-07 01:29:58,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 98. [2019-11-07 01:29:58,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2019-11-07 01:29:58,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 120 transitions. [2019-11-07 01:29:58,681 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 120 transitions. Word has length 33 [2019-11-07 01:29:58,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:29:58,681 INFO L462 AbstractCegarLoop]: Abstraction has 98 states and 120 transitions. [2019-11-07 01:29:58,681 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-11-07 01:29:58,681 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 120 transitions. [2019-11-07 01:29:58,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2019-11-07 01:29:58,683 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:29:58,683 INFO L410 BasicCegarLoop]: trace histogram [24, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:29:58,886 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:29:58,886 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:29:58,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:29:58,887 INFO L82 PathProgramCache]: Analyzing trace with hash -130175289, now seen corresponding path program 2 times [2019-11-07 01:29:58,887 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:29:58,887 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [416322349] [2019-11-07 01:29:58,887 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:29:58,924 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 01:29:58,924 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2063034686] [2019-11-07 01:29:58,924 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 01:29:59,070 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-11-07 01:29:59,071 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:29:59,073 INFO L256 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-07 01:29:59,076 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:29:59,147 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 154 proven. 21 refuted. 0 times theorem prover too weak. 221 trivial. 0 not checked. [2019-11-07 01:29:59,147 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:29:59,230 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 7 proven. 168 refuted. 0 times theorem prover too weak. 221 trivial. 0 not checked. [2019-11-07 01:29:59,231 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [416322349] [2019-11-07 01:29:59,231 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 01:29:59,231 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2063034686] [2019-11-07 01:29:59,231 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1670687386] [2019-11-07 01:29:59,233 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:29:59,233 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:29:59,233 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:29:59,234 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:29:59,234 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:29:59,279 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:30:00,101 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs [2019-11-07 01:30:00,110 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:30:00,113 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:30:00,512 WARN L191 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 39 [2019-11-07 01:30:00,844 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 01:30:00,844 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 12] total 30 [2019-11-07 01:30:00,845 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295473402] [2019-11-07 01:30:00,845 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-11-07 01:30:00,845 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:30:00,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-11-07 01:30:00,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=653, Unknown=0, NotChecked=0, Total=870 [2019-11-07 01:30:00,848 INFO L87 Difference]: Start difference. First operand 98 states and 120 transitions. Second operand 30 states. [2019-11-07 01:30:02,366 WARN L191 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 42 [2019-11-07 01:30:03,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:30:03,533 INFO L93 Difference]: Finished difference Result 265 states and 371 transitions. [2019-11-07 01:30:03,534 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-11-07 01:30:03,534 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 49 [2019-11-07 01:30:03,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:30:03,536 INFO L225 Difference]: With dead ends: 265 [2019-11-07 01:30:03,536 INFO L226 Difference]: Without dead ends: 181 [2019-11-07 01:30:03,539 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 117 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 920 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=722, Invalid=2140, Unknown=0, NotChecked=0, Total=2862 [2019-11-07 01:30:03,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2019-11-07 01:30:03,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 178. [2019-11-07 01:30:03,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2019-11-07 01:30:03,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 216 transitions. [2019-11-07 01:30:03,573 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 216 transitions. Word has length 49 [2019-11-07 01:30:03,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:30:03,573 INFO L462 AbstractCegarLoop]: Abstraction has 178 states and 216 transitions. [2019-11-07 01:30:03,573 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-11-07 01:30:03,573 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 216 transitions. [2019-11-07 01:30:03,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2019-11-07 01:30:03,576 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:30:03,576 INFO L410 BasicCegarLoop]: trace histogram [56, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:30:03,779 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:30:03,780 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:30:03,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:30:03,780 INFO L82 PathProgramCache]: Analyzing trace with hash -1937432377, now seen corresponding path program 3 times [2019-11-07 01:30:03,781 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:30:03,781 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1001986583] [2019-11-07 01:30:03,781 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:30:03,803 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 01:30:03,803 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [568117443] [2019-11-07 01:30:03,803 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:30:03,904 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:30:03,905 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:30:03,906 INFO L256 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-07 01:30:03,911 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:30:04,153 INFO L134 CoverageAnalysis]: Checked inductivity of 1788 backedges. 1002 proven. 242 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2019-11-07 01:30:04,154 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:30:04,415 INFO L134 CoverageAnalysis]: Checked inductivity of 1788 backedges. 1002 proven. 242 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2019-11-07 01:30:04,415 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1001986583] [2019-11-07 01:30:04,415 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 01:30:04,416 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [568117443] [2019-11-07 01:30:04,416 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [919672204] [2019-11-07 01:30:04,417 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:30:04,417 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:30:04,418 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:30:04,418 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:30:04,418 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:30:04,442 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:30:04,944 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs [2019-11-07 01:30:04,950 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:30:04,951 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:30:05,472 WARN L191 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 39 [2019-11-07 01:30:05,941 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 01:30:05,941 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 12] total 50 [2019-11-07 01:30:05,942 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831861397] [2019-11-07 01:30:05,943 INFO L442 AbstractCegarLoop]: Interpolant automaton has 50 states [2019-11-07 01:30:05,943 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:30:05,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2019-11-07 01:30:05,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=578, Invalid=1872, Unknown=0, NotChecked=0, Total=2450 [2019-11-07 01:30:05,946 INFO L87 Difference]: Start difference. First operand 178 states and 216 transitions. Second operand 50 states. [2019-11-07 01:30:07,316 WARN L191 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 34 [2019-11-07 01:30:07,790 WARN L191 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 35 [2019-11-07 01:30:08,370 WARN L191 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 35 [2019-11-07 01:30:09,868 WARN L191 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 36 [2019-11-07 01:30:10,123 WARN L191 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 35 [2019-11-07 01:30:10,348 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 34 [2019-11-07 01:30:10,673 WARN L191 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 42 [2019-11-07 01:30:12,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:30:12,739 INFO L93 Difference]: Finished difference Result 700 states and 872 transitions. [2019-11-07 01:30:12,739 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2019-11-07 01:30:12,739 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 81 [2019-11-07 01:30:12,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:30:12,745 INFO L225 Difference]: With dead ends: 700 [2019-11-07 01:30:12,745 INFO L226 Difference]: Without dead ends: 561 [2019-11-07 01:30:12,750 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 194 SyntacticMatches, 2 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3840 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=2688, Invalid=8024, Unknown=0, NotChecked=0, Total=10712 [2019-11-07 01:30:12,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 561 states. [2019-11-07 01:30:12,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 561 to 558. [2019-11-07 01:30:12,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 558 states. [2019-11-07 01:30:12,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 558 states to 558 states and 681 transitions. [2019-11-07 01:30:12,821 INFO L78 Accepts]: Start accepts. Automaton has 558 states and 681 transitions. Word has length 81 [2019-11-07 01:30:12,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:30:12,822 INFO L462 AbstractCegarLoop]: Abstraction has 558 states and 681 transitions. [2019-11-07 01:30:12,822 INFO L463 AbstractCegarLoop]: Interpolant automaton has 50 states. [2019-11-07 01:30:12,822 INFO L276 IsEmpty]: Start isEmpty. Operand 558 states and 681 transitions. [2019-11-07 01:30:12,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 242 [2019-11-07 01:30:12,830 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:30:12,831 INFO L410 BasicCegarLoop]: trace histogram [196, 14, 14, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:30:13,032 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:30:13,033 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:30:13,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:30:13,034 INFO L82 PathProgramCache]: Analyzing trace with hash 1331474927, now seen corresponding path program 4 times [2019-11-07 01:30:13,035 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:30:13,035 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [781067064] [2019-11-07 01:30:13,035 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:30:13,049 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 01:30:13,049 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1894305986] [2019-11-07 01:30:13,050 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:30:13,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:30:13,263 INFO L256 TraceCheckSpWp]: Trace formula consists of 957 conjuncts, 17 conjunts are in the unsatisfiable core [2019-11-07 01:30:13,275 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:30:13,536 INFO L134 CoverageAnalysis]: Checked inductivity of 22068 backedges. 2942 proven. 105 refuted. 0 times theorem prover too weak. 19021 trivial. 0 not checked. [2019-11-07 01:30:13,537 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:30:13,846 INFO L134 CoverageAnalysis]: Checked inductivity of 22068 backedges. 2942 proven. 105 refuted. 0 times theorem prover too weak. 19021 trivial. 0 not checked. [2019-11-07 01:30:13,847 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [781067064] [2019-11-07 01:30:13,847 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 01:30:13,847 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1894305986] [2019-11-07 01:30:13,847 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1945649956] [2019-11-07 01:30:13,849 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:30:13,849 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:30:13,849 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:30:13,849 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:30:13,850 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:30:13,865 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:30:13,931 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 01:30:14,313 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs [2019-11-07 01:30:14,318 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:30:14,319 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:30:14,725 WARN L191 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 39 [2019-11-07 01:30:15,041 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 01:30:15,041 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 12] total 46 [2019-11-07 01:30:15,042 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1730902121] [2019-11-07 01:30:15,043 INFO L442 AbstractCegarLoop]: Interpolant automaton has 46 states [2019-11-07 01:30:15,044 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:30:15,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2019-11-07 01:30:15,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=641, Invalid=1429, Unknown=0, NotChecked=0, Total=2070 [2019-11-07 01:30:15,045 INFO L87 Difference]: Start difference. First operand 558 states and 681 transitions. Second operand 46 states. [2019-11-07 01:30:18,298 WARN L191 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 42 [2019-11-07 01:30:18,624 WARN L191 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 34 [2019-11-07 01:30:20,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:30:20,186 INFO L93 Difference]: Finished difference Result 1657 states and 2349 transitions. [2019-11-07 01:30:20,186 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2019-11-07 01:30:20,187 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 241 [2019-11-07 01:30:20,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:30:20,198 INFO L225 Difference]: With dead ends: 1657 [2019-11-07 01:30:20,199 INFO L226 Difference]: Without dead ends: 1121 [2019-11-07 01:30:20,204 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 763 GetRequests, 677 SyntacticMatches, 2 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2276 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=2090, Invalid=5220, Unknown=0, NotChecked=0, Total=7310 [2019-11-07 01:30:20,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1121 states. [2019-11-07 01:30:20,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1121 to 1118. [2019-11-07 01:30:20,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1118 states. [2019-11-07 01:30:20,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1118 states to 1118 states and 1353 transitions. [2019-11-07 01:30:20,409 INFO L78 Accepts]: Start accepts. Automaton has 1118 states and 1353 transitions. Word has length 241 [2019-11-07 01:30:20,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:30:20,412 INFO L462 AbstractCegarLoop]: Abstraction has 1118 states and 1353 transitions. [2019-11-07 01:30:20,412 INFO L463 AbstractCegarLoop]: Interpolant automaton has 46 states. [2019-11-07 01:30:20,413 INFO L276 IsEmpty]: Start isEmpty. Operand 1118 states and 1353 transitions. [2019-11-07 01:30:20,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 466 [2019-11-07 01:30:20,437 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:30:20,437 INFO L410 BasicCegarLoop]: trace histogram [420, 14, 14, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:30:20,642 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:30:20,642 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:30:20,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:30:20,643 INFO L82 PathProgramCache]: Analyzing trace with hash -148070417, now seen corresponding path program 5 times [2019-11-07 01:30:20,643 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:30:20,643 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1816785615] [2019-11-07 01:30:20,643 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:30:20,677 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 01:30:20,677 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [432343753] [2019-11-07 01:30:20,677 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 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