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/rev-2-n-u.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:37:20,876 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:37:20,879 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:37:20,896 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 01:37:20,897 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 01:37:20,898 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 01:37:20,900 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 01:37:20,909 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 01:37:20,914 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 01:37:20,917 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 01:37:20,919 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 01:37:20,920 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 01:37:20,920 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:37:20,922 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:37:20,925 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:37:20,926 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:37:20,927 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:37:20,928 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:37:20,930 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:37:20,934 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:37:20,939 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:37:20,942 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:37:20,943 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:37:20,944 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:37:20,945 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:37:20,952 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:37:20,953 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:37:20,954 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:37:20,955 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 [2019-10-15 01:37:20,968 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:37:20,968 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:37:20,969 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:37:20,970 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:37:20,970 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:37:20,970 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:37:20,970 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:37:20,971 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:37:20,971 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:37:20,971 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:37:20,971 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:37:20,971 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:37:20,971 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:37:20,972 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:37:20,972 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:37:20,972 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:37:20,972 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:37:20,973 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:37:20,973 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:37:20,973 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:37:20,973 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:37:20,973 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:37:20,974 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:37:20,974 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:37:20,974 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:37:20,974 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:37:20,974 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:37:20,975 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:37:20,975 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 [2019-10-15 01:37:21,254 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:37:21,267 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:37:21,270 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:37:21,272 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:37:21,272 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:37:21,273 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-multidimensional/rev-2-n-u.c [2019-10-15 01:37:21,353 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6baef2711/7c93a9aeb7e2452e8acce05d241dcdf9/FLAG5762489e6 [2019-10-15 01:37:21,856 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:37:21,859 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-multidimensional/rev-2-n-u.c [2019-10-15 01:37:21,866 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6baef2711/7c93a9aeb7e2452e8acce05d241dcdf9/FLAG5762489e6 [2019-10-15 01:37:22,252 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6baef2711/7c93a9aeb7e2452e8acce05d241dcdf9 [2019-10-15 01:37:22,262 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:37:22,264 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:37:22,265 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:37:22,265 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:37:22,268 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:37:22,269 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:37:22" (1/1) ... [2019-10-15 01:37:22,272 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@517e93e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:37:22, skipping insertion in model container [2019-10-15 01:37:22,272 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:37:22" (1/1) ... [2019-10-15 01:37:22,280 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:37:22,298 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:37:22,499 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:37:22,504 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:37:22,529 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:37:22,642 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:37:22,642 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:37:22 WrapperNode [2019-10-15 01:37:22,643 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:37:22,643 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:37:22,643 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:37:22,644 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:37:22,656 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:37:22" (1/1) ... [2019-10-15 01:37:22,656 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:37:22" (1/1) ... [2019-10-15 01:37:22,663 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:37:22" (1/1) ... [2019-10-15 01:37:22,664 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:37:22" (1/1) ... [2019-10-15 01:37:22,671 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:37:22" (1/1) ... [2019-10-15 01:37:22,677 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:37:22" (1/1) ... [2019-10-15 01:37:22,678 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:37:22" (1/1) ... [2019-10-15 01:37:22,680 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:37:22,681 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:37:22,681 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:37:22,681 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:37:22,682 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:37:22" (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 [2019-10-15 01:37:22,740 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:37:22,741 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:37:22,741 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 01:37:22,741 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:37:22,741 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:37:22,741 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:37:22,742 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:37:22,742 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:37:22,742 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-15 01:37:22,742 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 01:37:22,742 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 01:37:22,742 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 01:37:22,743 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:37:22,743 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:37:23,123 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:37:23,123 INFO L284 CfgBuilder]: Removed 6 assume(true) statements. [2019-10-15 01:37:23,124 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:37:23 BoogieIcfgContainer [2019-10-15 01:37:23,125 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:37:23,126 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:37:23,126 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:37:23,129 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:37:23,129 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:37:22" (1/3) ... [2019-10-15 01:37:23,130 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f8af0c8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:37:23, skipping insertion in model container [2019-10-15 01:37:23,130 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:37:22" (2/3) ... [2019-10-15 01:37:23,131 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f8af0c8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:37:23, skipping insertion in model container [2019-10-15 01:37:23,131 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:37:23" (3/3) ... [2019-10-15 01:37:23,133 INFO L109 eAbstractionObserver]: Analyzing ICFG rev-2-n-u.c [2019-10-15 01:37:23,146 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:37:23,160 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:37:23,170 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:37:23,192 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:37:23,192 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:37:23,192 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:37:23,192 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:37:23,193 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:37:23,193 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:37:23,193 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:37:23,193 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:37:23,207 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2019-10-15 01:37:23,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-15 01:37:23,212 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:37:23,212 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:37:23,214 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:37:23,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:37:23,219 INFO L82 PathProgramCache]: Analyzing trace with hash 357994483, now seen corresponding path program 1 times [2019-10-15 01:37:23,225 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:37:23,226 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1815035714] [2019-10-15 01:37:23,226 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:23,226 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:23,226 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:37:23,295 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-15 01:37:23,296 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [369663397] [2019-10-15 01:37:23,296 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 [2019-10-15 01:37:23,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:37:23,354 INFO L256 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 01:37:23,360 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:37:23,427 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:37:23,427 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:37:23,470 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:37:23,471 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1815035714] [2019-10-15 01:37:23,473 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 01:37:23,473 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [369663397] [2019-10-15 01:37:23,475 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:37:23,475 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2019-10-15 01:37:23,476 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740964850] [2019-10-15 01:37:23,481 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:37:23,482 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:37:23,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:37:23,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:37:23,502 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 4 states. [2019-10-15 01:37:23,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:37:23,615 INFO L93 Difference]: Finished difference Result 40 states and 54 transitions. [2019-10-15 01:37:23,616 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 01:37:23,617 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2019-10-15 01:37:23,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:37:23,627 INFO L225 Difference]: With dead ends: 40 [2019-10-15 01:37:23,628 INFO L226 Difference]: Without dead ends: 22 [2019-10-15 01:37:23,631 INFO L600 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 [2019-10-15 01:37:23,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-10-15 01:37:23,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-10-15 01:37:23,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-15 01:37:23,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 28 transitions. [2019-10-15 01:37:23,681 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 28 transitions. Word has length 13 [2019-10-15 01:37:23,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:37:23,682 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 28 transitions. [2019-10-15 01:37:23,682 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 01:37:23,682 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 28 transitions. [2019-10-15 01:37:23,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-15 01:37:23,683 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:37:23,684 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:37:23,890 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:37:23,891 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:37:23,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:37:23,893 INFO L82 PathProgramCache]: Analyzing trace with hash -964628371, now seen corresponding path program 1 times [2019-10-15 01:37:23,893 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:37:23,894 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1429099087] [2019-10-15 01:37:23,894 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:23,894 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:23,895 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:37:23,905 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-15 01:37:23,905 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1013060088] [2019-10-15 01:37:23,905 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 [2019-10-15 01:37:23,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:37:23,953 INFO L256 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 01:37:23,955 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:37:23,982 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:37:23,983 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:37:24,007 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:37:24,007 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1429099087] [2019-10-15 01:37:24,007 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 01:37:24,008 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1013060088] [2019-10-15 01:37:24,008 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:37:24,008 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2019-10-15 01:37:24,008 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703738123] [2019-10-15 01:37:24,010 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-15 01:37:24,010 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:37:24,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-15 01:37:24,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:37:24,011 INFO L87 Difference]: Start difference. First operand 22 states and 28 transitions. Second operand 6 states. [2019-10-15 01:37:24,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:37:24,150 INFO L93 Difference]: Finished difference Result 49 states and 70 transitions. [2019-10-15 01:37:24,151 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-15 01:37:24,152 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2019-10-15 01:37:24,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:37:24,155 INFO L225 Difference]: With dead ends: 49 [2019-10-15 01:37:24,155 INFO L226 Difference]: Without dead ends: 34 [2019-10-15 01:37:24,156 INFO L600 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 [2019-10-15 01:37:24,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-10-15 01:37:24,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2019-10-15 01:37:24,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-10-15 01:37:24,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2019-10-15 01:37:24,170 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 17 [2019-10-15 01:37:24,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:37:24,171 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2019-10-15 01:37:24,171 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-15 01:37:24,171 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2019-10-15 01:37:24,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-15 01:37:24,172 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:37:24,172 INFO L380 BasicCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:37:24,375 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:37:24,376 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:37:24,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:37:24,377 INFO L82 PathProgramCache]: Analyzing trace with hash 1384779757, now seen corresponding path program 1 times [2019-10-15 01:37:24,377 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:37:24,377 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [313520285] [2019-10-15 01:37:24,377 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:24,378 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:24,378 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:37:24,387 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-15 01:37:24,388 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [597407581] [2019-10-15 01:37:24,388 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 [2019-10-15 01:37:24,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:37:24,463 INFO L256 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-15 01:37:24,465 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:37:24,501 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:37:24,501 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:37:24,552 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:37:24,553 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [313520285] [2019-10-15 01:37:24,553 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 01:37:24,553 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [597407581] [2019-10-15 01:37:24,553 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [16430736] [2019-10-15 01:37:24,581 INFO L162 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-10-15 01:37:24,581 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:37:24,591 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:37:24,600 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:37:24,600 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:37:24,793 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:37:25,412 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2019-10-15 01:37:25,433 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:37:25,440 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:37:25,802 WARN L191 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 58 [2019-10-15 01:37:25,891 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-15 01:37:25,892 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [6, 6] total 18 [2019-10-15 01:37:25,892 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155489569] [2019-10-15 01:37:25,893 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-15 01:37:25,894 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:37:25,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-15 01:37:25,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2019-10-15 01:37:25,895 INFO L87 Difference]: Start difference. First operand 32 states and 39 transitions. Second operand 10 states. [2019-10-15 01:37:26,137 WARN L191 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 56 [2019-10-15 01:37:26,363 WARN L191 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 57 [2019-10-15 01:37:26,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:37:26,565 INFO L93 Difference]: Finished difference Result 53 states and 64 transitions. [2019-10-15 01:37:26,565 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-15 01:37:26,565 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 21 [2019-10-15 01:37:26,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:37:26,567 INFO L225 Difference]: With dead ends: 53 [2019-10-15 01:37:26,567 INFO L226 Difference]: Without dead ends: 38 [2019-10-15 01:37:26,568 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 40 SyntacticMatches, 6 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 165 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=100, Invalid=452, Unknown=0, NotChecked=0, Total=552 [2019-10-15 01:37:26,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-10-15 01:37:26,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 33. [2019-10-15 01:37:26,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-10-15 01:37:26,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 40 transitions. [2019-10-15 01:37:26,580 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 40 transitions. Word has length 21 [2019-10-15 01:37:26,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:37:26,580 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 40 transitions. [2019-10-15 01:37:26,580 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-15 01:37:26,580 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 40 transitions. [2019-10-15 01:37:26,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-10-15 01:37:26,581 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:37:26,581 INFO L380 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:37:26,791 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:37:26,791 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:37:26,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:37:26,792 INFO L82 PathProgramCache]: Analyzing trace with hash 1560648546, now seen corresponding path program 1 times [2019-10-15 01:37:26,792 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:37:26,793 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249182824] [2019-10-15 01:37:26,793 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:26,794 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:26,794 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:37:26,801 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-15 01:37:26,802 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [892816126] [2019-10-15 01:37:26,802 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 [2019-10-15 01:37:26,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:37:26,869 INFO L256 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-15 01:37:26,871 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:37:26,917 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-15 01:37:26,917 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:37:26,964 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-15 01:37:26,965 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249182824] [2019-10-15 01:37:26,965 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 01:37:26,965 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [892816126] [2019-10-15 01:37:26,965 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [758353479] [2019-10-15 01:37:26,968 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:37:26,968 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:37:26,968 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:37:26,969 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:37:26,969 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:37:27,000 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:37:27,585 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2019-10-15 01:37:27,602 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:37:27,610 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:37:27,923 WARN L191 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 58 [2019-10-15 01:37:28,239 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:37:28,239 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 14] total 24 [2019-10-15 01:37:28,240 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573746245] [2019-10-15 01:37:28,241 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-15 01:37:28,241 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:37:28,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-15 01:37:28,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=465, Unknown=0, NotChecked=0, Total=552 [2019-10-15 01:37:28,242 INFO L87 Difference]: Start difference. First operand 33 states and 40 transitions. Second operand 24 states. [2019-10-15 01:37:28,518 WARN L191 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 54 [2019-10-15 01:37:29,024 WARN L191 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 62 [2019-10-15 01:37:29,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:37:29,797 INFO L93 Difference]: Finished difference Result 92 states and 125 transitions. [2019-10-15 01:37:29,798 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-15 01:37:29,798 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 25 [2019-10-15 01:37:29,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:37:29,799 INFO L225 Difference]: With dead ends: 92 [2019-10-15 01:37:29,799 INFO L226 Difference]: Without dead ends: 68 [2019-10-15 01:37:29,801 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 397 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=323, Invalid=1237, Unknown=0, NotChecked=0, Total=1560 [2019-10-15 01:37:29,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-10-15 01:37:29,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 64. [2019-10-15 01:37:29,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-10-15 01:37:29,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 76 transitions. [2019-10-15 01:37:29,818 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 76 transitions. Word has length 25 [2019-10-15 01:37:29,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:37:29,818 INFO L462 AbstractCegarLoop]: Abstraction has 64 states and 76 transitions. [2019-10-15 01:37:29,818 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-10-15 01:37:29,818 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 76 transitions. [2019-10-15 01:37:29,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-10-15 01:37:29,820 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:37:29,820 INFO L380 BasicCegarLoop]: trace histogram [12, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:37:30,023 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:37:30,024 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:37:30,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:37:30,025 INFO L82 PathProgramCache]: Analyzing trace with hash 223123874, now seen corresponding path program 2 times [2019-10-15 01:37:30,025 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:37:30,025 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1348194642] [2019-10-15 01:37:30,026 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:30,026 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:30,027 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:37:30,040 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-15 01:37:30,041 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1210875348] [2019-10-15 01:37:30,041 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 [2019-10-15 01:37:30,119 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-15 01:37:30,119 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:37:30,120 INFO L256 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:37:30,125 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:37:30,155 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 115 trivial. 0 not checked. [2019-10-15 01:37:30,155 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:37:30,181 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 115 trivial. 0 not checked. [2019-10-15 01:37:30,182 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1348194642] [2019-10-15 01:37:30,182 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 01:37:30,182 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1210875348] [2019-10-15 01:37:30,182 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [755503396] [2019-10-15 01:37:30,184 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:37:30,184 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:37:30,185 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:37:30,185 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:37:30,185 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:37:30,219 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:37:30,757 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2019-10-15 01:37:30,770 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:37:30,783 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:37:31,086 WARN L191 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 58 [2019-10-15 01:37:31,400 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:37:31,400 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 14] total 22 [2019-10-15 01:37:31,400 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [752106699] [2019-10-15 01:37:31,401 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-10-15 01:37:31,401 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:37:31,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-10-15 01:37:31,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=389, Unknown=0, NotChecked=0, Total=462 [2019-10-15 01:37:31,404 INFO L87 Difference]: Start difference. First operand 64 states and 76 transitions. Second operand 22 states. [2019-10-15 01:37:31,634 WARN L191 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 57 [2019-10-15 01:37:31,949 WARN L191 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 63 [2019-10-15 01:37:32,197 WARN L191 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 64 [2019-10-15 01:37:32,508 WARN L191 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 63 [2019-10-15 01:37:32,786 WARN L191 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 62 [2019-10-15 01:37:33,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:37:33,455 INFO L93 Difference]: Finished difference Result 206 states and 256 transitions. [2019-10-15 01:37:33,456 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-15 01:37:33,456 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 37 [2019-10-15 01:37:33,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:37:33,458 INFO L225 Difference]: With dead ends: 206 [2019-10-15 01:37:33,458 INFO L226 Difference]: Without dead ends: 164 [2019-10-15 01:37:33,459 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 307 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=269, Invalid=1063, Unknown=0, NotChecked=0, Total=1332 [2019-10-15 01:37:33,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2019-10-15 01:37:33,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 104. [2019-10-15 01:37:33,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2019-10-15 01:37:33,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 121 transitions. [2019-10-15 01:37:33,514 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 121 transitions. Word has length 37 [2019-10-15 01:37:33,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:37:33,514 INFO L462 AbstractCegarLoop]: Abstraction has 104 states and 121 transitions. [2019-10-15 01:37:33,515 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-10-15 01:37:33,515 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 121 transitions. [2019-10-15 01:37:33,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2019-10-15 01:37:33,519 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:37:33,519 INFO L380 BasicCegarLoop]: trace histogram [24, 24, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:37:33,723 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:37:33,724 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:37:33,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:37:33,725 INFO L82 PathProgramCache]: Analyzing trace with hash -353902917, now seen corresponding path program 3 times [2019-10-15 01:37:33,725 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:37:33,725 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1843013989] [2019-10-15 01:37:33,726 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:33,726 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:37:33,726 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:37:33,741 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-15 01:37:33,741 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [937700272] [2019-10-15 01:37:33,741 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 [2019-10-15 01:37:35,928 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:37:35,928 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:37:35,942 INFO L256 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 82 conjunts are in the unsatisfiable core [2019-10-15 01:37:35,949 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:37:36,535 WARN L191 SmtUtils]: Spent 380.00 ms on a formula simplification. DAG size of input: 119 DAG size of output: 97 [2019-10-15 01:37:36,802 WARN L191 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 125 DAG size of output: 43 [2019-10-15 01:37:37,429 WARN L191 SmtUtils]: Spent 595.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 125 [2019-10-15 01:37:37,759 WARN L191 SmtUtils]: Spent 310.00 ms on a formula simplification. DAG size of input: 178 DAG size of output: 47 [2019-10-15 01:37:38,756 WARN L191 SmtUtils]: Spent 930.00 ms on a formula simplification. DAG size of input: 277 DAG size of output: 157 [2019-10-15 01:37:39,801 WARN L191 SmtUtils]: Spent 991.00 ms on a formula simplification. DAG size of input: 322 DAG size of output: 55 [2019-10-15 01:37:40,570 WARN L191 SmtUtils]: Spent 699.00 ms on a formula simplification. DAG size of input: 381 DAG size of output: 101 [2019-10-15 01:37:43,886 WARN L191 SmtUtils]: Spent 3.13 s on a formula simplification. DAG size of input: 509 DAG size of output: 355