/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-crafted/zero_sum_const3.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:18:37,398 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 01:18:37,400 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 01:18:37,413 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-07 01:18:37,413 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-07 01:18:37,414 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-07 01:18:37,416 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-07 01:18:37,418 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-07 01:18:37,419 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-07 01:18:37,420 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-07 01:18:37,421 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-07 01:18:37,422 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-07 01:18:37,422 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 01:18:37,423 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 01:18:37,424 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 01:18:37,427 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 01:18:37,428 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 01:18:37,431 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 01:18:37,433 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 01:18:37,436 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 01:18:37,440 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 01:18:37,441 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 01:18:37,442 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 01:18:37,445 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 01:18:37,447 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 01:18:37,463 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:18:37,466 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:18:37,467 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:18:37,468 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 01:18:37,493 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:18:37,493 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:18:37,495 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:18:37,496 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:18:37,496 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:18:37,496 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:18:37,497 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:18:37,497 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:18:37,497 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:18:37,497 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:18:37,498 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:18:37,499 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:18:37,499 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:18:37,499 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:18:37,500 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:18:37,500 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:18:37,500 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:18:37,500 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:18:37,501 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:18:37,501 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:18:37,501 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:18:37,501 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:18:37,501 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:18:37,502 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:18:37,502 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:18:37,502 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:18:37,502 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:18:37,502 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:18:37,503 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 01:18:37,883 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:18:37,901 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:18:37,904 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:18:37,906 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:18:37,906 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:18:37,907 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-crafted/zero_sum_const3.c [2019-11-07 01:18:37,981 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/83343f8ab/273ee322989848aab7e8968a4c5d3e41/FLAGdffb9b4fc [2019-11-07 01:18:38,432 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:18:38,435 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-crafted/zero_sum_const3.c [2019-11-07 01:18:38,444 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/83343f8ab/273ee322989848aab7e8968a4c5d3e41/FLAGdffb9b4fc [2019-11-07 01:18:38,786 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/83343f8ab/273ee322989848aab7e8968a4c5d3e41 [2019-11-07 01:18:38,797 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:18:38,799 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:18:38,800 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:18:38,800 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:18:38,804 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:18:38,805 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:18:38" (1/1) ... [2019-11-07 01:18:38,808 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@698f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:38, skipping insertion in model container [2019-11-07 01:18:38,808 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:18:38" (1/1) ... [2019-11-07 01:18:38,816 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:18:38,842 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:18:39,064 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:18:39,081 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:18:39,101 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:18:39,116 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:18:39,117 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:39 WrapperNode [2019-11-07 01:18:39,117 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:18:39,118 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:18:39,118 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:18:39,118 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:18:39,204 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:39" (1/1) ... [2019-11-07 01:18:39,205 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:39" (1/1) ... [2019-11-07 01:18:39,215 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:39" (1/1) ... [2019-11-07 01:18:39,216 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:39" (1/1) ... [2019-11-07 01:18:39,238 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:39" (1/1) ... [2019-11-07 01:18:39,244 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:39" (1/1) ... [2019-11-07 01:18:39,246 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:39" (1/1) ... [2019-11-07 01:18:39,249 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:18:39,249 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:18:39,249 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:18:39,249 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:18:39,250 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:39" (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 01:18:39,311 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:18:39,312 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:18:39,312 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 01:18:39,312 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:18:39,312 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:18:39,312 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-11-07 01:18:39,312 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 01:18:39,313 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_long [2019-11-07 01:18:39,313 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2019-11-07 01:18:39,313 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:18:39,313 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-11-07 01:18:39,313 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:18:39,313 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:18:39,313 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:18:39,314 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:18:39,314 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:18:39,804 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:18:39,804 INFO L284 CfgBuilder]: Removed 7 assume(true) statements. [2019-11-07 01:18:39,806 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:18:39 BoogieIcfgContainer [2019-11-07 01:18:39,806 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:18:39,807 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:18:39,807 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:18:39,810 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:18:39,811 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:18:38" (1/3) ... [2019-11-07 01:18:39,811 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@276225e3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:18:39, skipping insertion in model container [2019-11-07 01:18:39,812 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:18:39" (2/3) ... [2019-11-07 01:18:39,812 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@276225e3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:18:39, skipping insertion in model container [2019-11-07 01:18:39,812 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:18:39" (3/3) ... [2019-11-07 01:18:39,814 INFO L109 eAbstractionObserver]: Analyzing ICFG zero_sum_const3.c [2019-11-07 01:18:39,824 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:18:39,831 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:18:39,842 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:18:39,868 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:18:39,868 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:18:39,868 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:18:39,869 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:18:39,869 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:18:39,869 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:18:39,869 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:18:39,869 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:18:39,888 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2019-11-07 01:18:39,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-07 01:18:39,895 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:39,896 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:39,898 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:39,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:39,903 INFO L82 PathProgramCache]: Analyzing trace with hash -68481076, now seen corresponding path program 1 times [2019-11-07 01:18:39,911 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:39,911 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [834295615] [2019-11-07 01:18:39,911 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:40,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:40,129 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 01:18:40,130 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [834295615] [2019-11-07 01:18:40,131 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:18:40,131 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-07 01:18:40,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634065126] [2019-11-07 01:18:40,138 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-07 01:18:40,138 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:40,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-07 01:18:40,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-07 01:18:40,156 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2019-11-07 01:18:40,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:40,260 INFO L93 Difference]: Finished difference Result 45 states and 60 transitions. [2019-11-07 01:18:40,260 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-07 01:18:40,262 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2019-11-07 01:18:40,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:40,272 INFO L225 Difference]: With dead ends: 45 [2019-11-07 01:18:40,273 INFO L226 Difference]: Without dead ends: 24 [2019-11-07 01:18:40,276 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-11-07 01:18:40,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-07 01:18:40,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-11-07 01:18:40,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-07 01:18:40,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 35 transitions. [2019-11-07 01:18:40,319 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 35 transitions. Word has length 17 [2019-11-07 01:18:40,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:40,319 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 35 transitions. [2019-11-07 01:18:40,319 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-07 01:18:40,320 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 35 transitions. [2019-11-07 01:18:40,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-07 01:18:40,321 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:40,321 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:40,321 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:40,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:40,322 INFO L82 PathProgramCache]: Analyzing trace with hash -1579005837, now seen corresponding path program 1 times [2019-11-07 01:18:40,322 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:40,322 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [97761144] [2019-11-07 01:18:40,323 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:40,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:40,396 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:18:40,400 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [97761144] [2019-11-07 01:18:40,401 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:18:40,401 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:18:40,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781818391] [2019-11-07 01:18:40,405 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:18:40,405 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:40,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:18:40,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:18:40,406 INFO L87 Difference]: Start difference. First operand 24 states and 35 transitions. Second operand 3 states. [2019-11-07 01:18:40,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:40,469 INFO L93 Difference]: Finished difference Result 42 states and 64 transitions. [2019-11-07 01:18:40,470 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:18:40,470 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2019-11-07 01:18:40,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:40,472 INFO L225 Difference]: With dead ends: 42 [2019-11-07 01:18:40,472 INFO L226 Difference]: Without dead ends: 25 [2019-11-07 01:18:40,474 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:18:40,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-11-07 01:18:40,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2019-11-07 01:18:40,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-11-07 01:18:40,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 36 transitions. [2019-11-07 01:18:40,489 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 36 transitions. Word has length 18 [2019-11-07 01:18:40,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:40,490 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 36 transitions. [2019-11-07 01:18:40,490 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:18:40,490 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 36 transitions. [2019-11-07 01:18:40,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-07 01:18:40,491 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:40,492 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:40,493 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:40,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:40,494 INFO L82 PathProgramCache]: Analyzing trace with hash -1817549222, now seen corresponding path program 1 times [2019-11-07 01:18:40,494 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:40,495 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1472163028] [2019-11-07 01:18:40,495 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:40,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:40,603 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 01:18:40,603 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1472163028] [2019-11-07 01:18:40,603 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:18:40,604 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-07 01:18:40,605 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938733272] [2019-11-07 01:18:40,605 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-07 01:18:40,605 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:40,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-07 01:18:40,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-07 01:18:40,606 INFO L87 Difference]: Start difference. First operand 25 states and 36 transitions. Second operand 4 states. [2019-11-07 01:18:40,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:40,699 INFO L93 Difference]: Finished difference Result 40 states and 60 transitions. [2019-11-07 01:18:40,701 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-07 01:18:40,701 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 19 [2019-11-07 01:18:40,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:40,703 INFO L225 Difference]: With dead ends: 40 [2019-11-07 01:18:40,703 INFO L226 Difference]: Without dead ends: 25 [2019-11-07 01:18:40,705 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 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 01:18:40,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-11-07 01:18:40,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2019-11-07 01:18:40,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-11-07 01:18:40,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 31 transitions. [2019-11-07 01:18:40,712 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 31 transitions. Word has length 19 [2019-11-07 01:18:40,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:40,713 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 31 transitions. [2019-11-07 01:18:40,713 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-07 01:18:40,713 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 31 transitions. [2019-11-07 01:18:40,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-11-07 01:18:40,714 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:40,714 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:40,715 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:40,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:40,715 INFO L82 PathProgramCache]: Analyzing trace with hash 2017864887, now seen corresponding path program 1 times [2019-11-07 01:18:40,716 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:40,716 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [228280762] [2019-11-07 01:18:40,716 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:40,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:40,835 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 01:18:40,835 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [228280762] [2019-11-07 01:18:40,836 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1026064222] [2019-11-07 01:18:40,836 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 01:18:40,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:40,926 INFO L256 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-07 01:18:40,934 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:18:40,987 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 01:18:40,987 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:18:41,031 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 01:18:41,031 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1495196127] [2019-11-07 01:18:41,056 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-11-07 01:18:41,057 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:18:41,063 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:18:41,070 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:18:41,071 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:18:41,232 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-11-07 01:18:42,037 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:18:42,046 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:18:42,053 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:18:42,701 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:18:42,702 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 18 [2019-11-07 01:18:42,703 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712420422] [2019-11-07 01:18:42,705 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-07 01:18:42,705 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:42,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-07 01:18:42,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2019-11-07 01:18:42,720 INFO L87 Difference]: Start difference. First operand 25 states and 31 transitions. Second operand 18 states. [2019-11-07 01:18:43,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:43,439 INFO L93 Difference]: Finished difference Result 43 states and 55 transitions. [2019-11-07 01:18:43,439 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-07 01:18:43,440 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 24 [2019-11-07 01:18:43,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:43,441 INFO L225 Difference]: With dead ends: 43 [2019-11-07 01:18:43,441 INFO L226 Difference]: Without dead ends: 26 [2019-11-07 01:18:43,442 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 156 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=106, Invalid=544, Unknown=0, NotChecked=0, Total=650 [2019-11-07 01:18:43,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-11-07 01:18:43,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-11-07 01:18:43,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-11-07 01:18:43,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2019-11-07 01:18:43,456 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 24 [2019-11-07 01:18:43,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:43,457 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2019-11-07 01:18:43,459 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-07 01:18:43,459 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2019-11-07 01:18:43,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-07 01:18:43,461 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:43,462 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:43,668 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:43,669 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:43,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:43,670 INFO L82 PathProgramCache]: Analyzing trace with hash -997981858, now seen corresponding path program 2 times [2019-11-07 01:18:43,670 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:43,671 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [818412712] [2019-11-07 01:18:43,671 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:43,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:43,748 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-07 01:18:43,748 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [818412712] [2019-11-07 01:18:43,749 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1702121758] [2019-11-07 01:18:43,749 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:43,809 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-07 01:18:43,809 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:18:43,811 INFO L256 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-07 01:18:43,815 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:18:43,860 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-07 01:18:43,860 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:18:43,888 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-07 01:18:43,889 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [940183759] [2019-11-07 01:18:43,893 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-11-07 01:18:43,893 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:18:43,894 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:18:43,894 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:18:43,894 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:18:43,937 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-11-07 01:18:44,345 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:18:44,349 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:18:44,351 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:18:44,888 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:18:44,889 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 11] total 19 [2019-11-07 01:18:44,889 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83992561] [2019-11-07 01:18:44,890 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-07 01:18:44,890 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:44,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-07 01:18:44,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2019-11-07 01:18:44,891 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand 19 states. [2019-11-07 01:18:45,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:45,778 INFO L93 Difference]: Finished difference Result 47 states and 63 transitions. [2019-11-07 01:18:45,779 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-07 01:18:45,779 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 25 [2019-11-07 01:18:45,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:45,780 INFO L225 Difference]: With dead ends: 47 [2019-11-07 01:18:45,780 INFO L226 Difference]: Without dead ends: 32 [2019-11-07 01:18:45,781 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 59 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 219 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=143, Invalid=727, Unknown=0, NotChecked=0, Total=870 [2019-11-07 01:18:45,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-07 01:18:45,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2019-11-07 01:18:45,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-07 01:18:45,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2019-11-07 01:18:45,790 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 25 [2019-11-07 01:18:45,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:45,790 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2019-11-07 01:18:45,790 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-07 01:18:45,790 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2019-11-07 01:18:45,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-11-07 01:18:45,791 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:45,792 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:45,996 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:45,996 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:45,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:45,997 INFO L82 PathProgramCache]: Analyzing trace with hash 567715820, now seen corresponding path program 3 times [2019-11-07 01:18:45,997 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:45,997 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1412120526] [2019-11-07 01:18:45,998 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:46,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:46,814 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:18:46,814 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1412120526] [2019-11-07 01:18:46,814 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1992459426] [2019-11-07 01:18:46,815 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:46,898 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:18:46,899 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:18:46,901 INFO L256 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 61 conjunts are in the unsatisfiable core [2019-11-07 01:18:46,912 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:18:47,238 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:18:47,240 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:18:47,480 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-07 01:18:47,480 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [527885948] [2019-11-07 01:18:47,482 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-11-07 01:18:47,482 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:18:47,483 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:18:47,483 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:18:47,483 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:18:47,515 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-11-07 01:18:47,929 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:18:47,936 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:18:47,938 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:18:48,751 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:18:48,751 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 10, 11] total 39 [2019-11-07 01:18:48,753 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258851458] [2019-11-07 01:18:48,754 INFO L442 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-11-07 01:18:48,754 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:48,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-11-07 01:18:48,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1356, Unknown=0, NotChecked=0, Total=1482 [2019-11-07 01:18:48,755 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand 39 states. [2019-11-07 01:18:50,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:50,546 INFO L93 Difference]: Finished difference Result 53 states and 64 transitions. [2019-11-07 01:18:50,549 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-07 01:18:50,549 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 31 [2019-11-07 01:18:50,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:50,550 INFO L225 Difference]: With dead ends: 53 [2019-11-07 01:18:50,550 INFO L226 Difference]: Without dead ends: 48 [2019-11-07 01:18:50,552 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 62 SyntacticMatches, 18 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 809 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=240, Invalid=2516, Unknown=0, NotChecked=0, Total=2756 [2019-11-07 01:18:50,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-11-07 01:18:50,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2019-11-07 01:18:50,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-11-07 01:18:50,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 57 transitions. [2019-11-07 01:18:50,562 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 57 transitions. Word has length 31 [2019-11-07 01:18:50,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:50,563 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 57 transitions. [2019-11-07 01:18:50,563 INFO L463 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-11-07 01:18:50,563 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 57 transitions. [2019-11-07 01:18:50,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-11-07 01:18:50,564 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:50,564 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:50,768 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:50,768 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:50,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:50,769 INFO L82 PathProgramCache]: Analyzing trace with hash 1042486227, now seen corresponding path program 4 times [2019-11-07 01:18:50,769 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:50,769 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045261177] [2019-11-07 01:18:50,769 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:50,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:50,871 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-07 01:18:50,871 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045261177] [2019-11-07 01:18:50,872 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [373614456] [2019-11-07 01:18:50,872 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:50,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:50,939 INFO L256 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-07 01:18:50,941 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:18:50,994 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-07 01:18:50,994 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:18:51,034 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-07 01:18:51,035 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1654919958] [2019-11-07 01:18:51,037 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-11-07 01:18:51,038 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:18:51,038 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:18:51,038 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:18:51,038 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:18:51,067 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-11-07 01:18:51,491 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:18:51,498 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:18:51,500 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:18:52,129 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:18:52,130 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 11] total 24 [2019-11-07 01:18:52,130 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705098818] [2019-11-07 01:18:52,132 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-11-07 01:18:52,132 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:52,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-11-07 01:18:52,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2019-11-07 01:18:52,133 INFO L87 Difference]: Start difference. First operand 46 states and 57 transitions. Second operand 24 states. [2019-11-07 01:18:53,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:53,399 INFO L93 Difference]: Finished difference Result 92 states and 119 transitions. [2019-11-07 01:18:53,400 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-11-07 01:18:53,400 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 32 [2019-11-07 01:18:53,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:53,403 INFO L225 Difference]: With dead ends: 92 [2019-11-07 01:18:53,403 INFO L226 Difference]: Without dead ends: 53 [2019-11-07 01:18:53,404 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 77 SyntacticMatches, 4 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 399 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=219, Invalid=1263, Unknown=0, NotChecked=0, Total=1482 [2019-11-07 01:18:53,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-11-07 01:18:53,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2019-11-07 01:18:53,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2019-11-07 01:18:53,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2019-11-07 01:18:53,415 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 32 [2019-11-07 01:18:53,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:53,415 INFO L462 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2019-11-07 01:18:53,415 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-11-07 01:18:53,415 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2019-11-07 01:18:53,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-11-07 01:18:53,416 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:53,417 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:53,620 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:53,620 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:53,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:53,621 INFO L82 PathProgramCache]: Analyzing trace with hash 1643204986, now seen corresponding path program 5 times [2019-11-07 01:18:53,621 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:53,621 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323843673] [2019-11-07 01:18:53,622 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:53,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:53,791 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-11-07 01:18:53,792 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [323843673] [2019-11-07 01:18:53,792 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1031016750] [2019-11-07 01:18:53,792 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 01:18:53,877 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 01:18:53,878 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:18:53,879 INFO L256 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-07 01:18:53,880 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:18:53,928 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-11-07 01:18:53,929 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:18:53,979 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-11-07 01:18:53,979 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [892099711] [2019-11-07 01:18:53,981 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-11-07 01:18:53,981 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:18:53,982 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:18:53,982 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:18:53,982 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:18:54,009 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-11-07 01:18:54,295 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:18:54,299 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:18:54,301 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:18:54,901 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:18:54,902 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 11] total 25 [2019-11-07 01:18:54,902 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063198488] [2019-11-07 01:18:54,903 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-07 01:18:54,904 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:18:54,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-07 01:18:54,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=512, Unknown=0, NotChecked=0, Total=600 [2019-11-07 01:18:54,905 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand 25 states. [2019-11-07 01:18:56,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:18:56,234 INFO L93 Difference]: Finished difference Result 56 states and 66 transitions. [2019-11-07 01:18:56,234 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-07 01:18:56,234 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 33 [2019-11-07 01:18:56,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:18:56,235 INFO L225 Difference]: With dead ends: 56 [2019-11-07 01:18:56,236 INFO L226 Difference]: Without dead ends: 39 [2019-11-07 01:18:56,237 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 78 SyntacticMatches, 6 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 433 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=213, Invalid=1269, Unknown=0, NotChecked=0, Total=1482 [2019-11-07 01:18:56,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-11-07 01:18:56,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2019-11-07 01:18:56,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-11-07 01:18:56,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 45 transitions. [2019-11-07 01:18:56,245 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 45 transitions. Word has length 33 [2019-11-07 01:18:56,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:18:56,246 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 45 transitions. [2019-11-07 01:18:56,246 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-07 01:18:56,246 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 45 transitions. [2019-11-07 01:18:56,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-11-07 01:18:56,247 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:18:56,247 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:18:56,451 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:18:56,451 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:18:56,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:18:56,453 INFO L82 PathProgramCache]: Analyzing trace with hash -1638161385, now seen corresponding path program 6 times [2019-11-07 01:18:56,453 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:18:56,454 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1459150184] [2019-11-07 01:18:56,454 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:18:56,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:18:57,142 WARN L191 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 41 [2019-11-07 01:18:57,275 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 37 [2019-11-07 01:18:57,519 WARN L191 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 41 [2019-11-07 01:18:57,686 WARN L191 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 39 [2019-11-07 01:18:58,013 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 41 [2019-11-07 01:18:58,215 WARN L191 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 44 [2019-11-07 01:18:58,418 WARN L191 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 40 [2019-11-07 01:18:58,675 WARN L191 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 50 [2019-11-07 01:18:58,812 WARN L191 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 44 [2019-11-07 01:18:59,189 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 44 [2019-11-07 01:18:59,340 WARN L191 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 46 [2019-11-07 01:18:59,886 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:18:59,886 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1459150184] [2019-11-07 01:18:59,887 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [38271243] [2019-11-07 01:18:59,887 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 01:18:59,994 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:18:59,994 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:18:59,999 INFO L256 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 87 conjunts are in the unsatisfiable core [2019-11-07 01:19:00,010 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:00,797 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:19:00,798 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:01,423 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 01:19:01,424 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [113579487] [2019-11-07 01:19:01,430 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-11-07 01:19:01,430 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:01,430 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:01,431 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:01,431 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:01,473 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-11-07 01:19:01,838 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:19:01,843 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:19:01,845 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:02,832 WARN L191 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2019-11-07 01:19:02,921 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:02,921 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 16, 12, 11] total 63 [2019-11-07 01:19:02,922 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43798079] [2019-11-07 01:19:02,923 INFO L442 AbstractCegarLoop]: Interpolant automaton has 63 states [2019-11-07 01:19:02,923 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:02,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2019-11-07 01:19:02,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=3592, Unknown=0, NotChecked=0, Total=3906 [2019-11-07 01:19:02,925 INFO L87 Difference]: Start difference. First operand 39 states and 45 transitions. Second operand 63 states. [2019-11-07 01:19:03,863 WARN L191 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 56 [2019-11-07 01:19:04,245 WARN L191 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 51 [2019-11-07 01:19:04,807 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 57 [2019-11-07 01:19:05,451 WARN L191 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 55 [2019-11-07 01:19:06,003 WARN L191 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 56 [2019-11-07 01:19:06,411 WARN L191 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 43 [2019-11-07 01:19:06,793 WARN L191 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 48 [2019-11-07 01:19:07,010 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 47 [2019-11-07 01:19:08,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:08,245 INFO L93 Difference]: Finished difference Result 89 states and 106 transitions. [2019-11-07 01:19:08,246 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-11-07 01:19:08,246 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 38 [2019-11-07 01:19:08,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:08,247 INFO L225 Difference]: With dead ends: 89 [2019-11-07 01:19:08,247 INFO L226 Difference]: Without dead ends: 44 [2019-11-07 01:19:08,255 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 75 SyntacticMatches, 10 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3109 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=718, Invalid=7472, Unknown=0, NotChecked=0, Total=8190 [2019-11-07 01:19:08,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-11-07 01:19:08,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 40. [2019-11-07 01:19:08,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-11-07 01:19:08,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2019-11-07 01:19:08,275 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 38 [2019-11-07 01:19:08,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:08,275 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2019-11-07 01:19:08,275 INFO L463 AbstractCegarLoop]: Interpolant automaton has 63 states. [2019-11-07 01:19:08,276 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2019-11-07 01:19:08,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-07 01:19:08,277 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:08,277 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:08,482 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:08,483 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:08,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:08,483 INFO L82 PathProgramCache]: Analyzing trace with hash -163628948, now seen corresponding path program 7 times [2019-11-07 01:19:08,483 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:08,484 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [969604110] [2019-11-07 01:19:08,485 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:08,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:08,552 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-11-07 01:19:08,554 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [969604110] [2019-11-07 01:19:08,554 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [133826367] [2019-11-07 01:19:08,554 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 01:19:08,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:08,646 INFO L256 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-07 01:19:08,656 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:08,713 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-11-07 01:19:08,714 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:08,756 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-11-07 01:19:08,757 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [801972896] [2019-11-07 01:19:08,758 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-11-07 01:19:08,758 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:08,758 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:08,758 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:08,758 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:08,775 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-11-07 01:19:09,042 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:19:09,046 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:19:09,048 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:09,781 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:09,782 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 11] total 27 [2019-11-07 01:19:09,782 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582555842] [2019-11-07 01:19:09,783 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-07 01:19:09,784 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:09,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-07 01:19:09,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=599, Unknown=0, NotChecked=0, Total=702 [2019-11-07 01:19:09,785 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand 27 states. [2019-11-07 01:19:11,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:11,200 INFO L93 Difference]: Finished difference Result 94 states and 115 transitions. [2019-11-07 01:19:11,201 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-11-07 01:19:11,201 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 39 [2019-11-07 01:19:11,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:11,202 INFO L225 Difference]: With dead ends: 94 [2019-11-07 01:19:11,202 INFO L226 Difference]: Without dead ends: 64 [2019-11-07 01:19:11,204 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 95 SyntacticMatches, 6 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 583 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=289, Invalid=1691, Unknown=0, NotChecked=0, Total=1980 [2019-11-07 01:19:11,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-11-07 01:19:11,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2019-11-07 01:19:11,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-11-07 01:19:11,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 71 transitions. [2019-11-07 01:19:11,216 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 71 transitions. Word has length 39 [2019-11-07 01:19:11,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:11,216 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 71 transitions. [2019-11-07 01:19:11,216 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-07 01:19:11,216 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 71 transitions. [2019-11-07 01:19:11,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-11-07 01:19:11,217 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:11,218 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:11,421 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:11,421 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:11,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:11,422 INFO L82 PathProgramCache]: Analyzing trace with hash -96034587, now seen corresponding path program 8 times [2019-11-07 01:19:11,422 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:11,422 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [726468139] [2019-11-07 01:19:11,422 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:11,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:11,562 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2019-11-07 01:19:11,563 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [726468139] [2019-11-07 01:19:11,563 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2100701869] [2019-11-07 01:19:11,563 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 [2019-11-07 01:19:11,669 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 01:19:11,670 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:19:11,675 INFO L256 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-07 01:19:11,677 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:11,742 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2019-11-07 01:19:11,743 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:11,814 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2019-11-07 01:19:11,815 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [872121512] [2019-11-07 01:19:11,816 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-11-07 01:19:11,816 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:11,817 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:11,817 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:11,817 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:11,841 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-11-07 01:19:12,114 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:19:12,121 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:19:12,122 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:12,698 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:12,699 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11] total 28 [2019-11-07 01:19:12,699 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1990715473] [2019-11-07 01:19:12,700 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-11-07 01:19:12,700 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:12,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-11-07 01:19:12,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=646, Unknown=0, NotChecked=0, Total=756 [2019-11-07 01:19:12,701 INFO L87 Difference]: Start difference. First operand 61 states and 71 transitions. Second operand 28 states. [2019-11-07 01:19:14,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:14,205 INFO L93 Difference]: Finished difference Result 67 states and 77 transitions. [2019-11-07 01:19:14,205 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-07 01:19:14,205 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 40 [2019-11-07 01:19:14,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:14,206 INFO L225 Difference]: With dead ends: 67 [2019-11-07 01:19:14,207 INFO L226 Difference]: Without dead ends: 46 [2019-11-07 01:19:14,208 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 96 SyntacticMatches, 8 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 601 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=266, Invalid=1626, Unknown=0, NotChecked=0, Total=1892 [2019-11-07 01:19:14,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-11-07 01:19:14,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2019-11-07 01:19:14,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-11-07 01:19:14,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2019-11-07 01:19:14,218 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 40 [2019-11-07 01:19:14,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:14,219 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2019-11-07 01:19:14,219 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-11-07 01:19:14,219 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2019-11-07 01:19:14,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-11-07 01:19:14,220 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:14,220 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:14,423 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:14,424 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:14,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:14,424 INFO L82 PathProgramCache]: Analyzing trace with hash -1903048692, now seen corresponding path program 9 times [2019-11-07 01:19:14,424 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:14,425 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2042119361] [2019-11-07 01:19:14,425 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:14,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:14,918 WARN L191 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 33 [2019-11-07 01:19:15,147 WARN L191 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 36 [2019-11-07 01:19:15,310 WARN L191 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 34 [2019-11-07 01:19:15,620 WARN L191 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2019-11-07 01:19:15,850 WARN L191 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 44 [2019-11-07 01:19:16,072 WARN L191 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 46 [2019-11-07 01:19:16,293 WARN L191 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 42 [2019-11-07 01:19:16,512 WARN L191 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 40 [2019-11-07 01:19:16,756 WARN L191 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 46 [2019-11-07 01:19:17,042 WARN L191 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 48 [2019-11-07 01:19:17,296 WARN L191 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 45 [2019-11-07 01:19:17,567 WARN L191 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 39 [2019-11-07 01:19:17,904 WARN L191 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 48 [2019-11-07 01:19:18,196 WARN L191 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 46 [2019-11-07 01:19:18,410 WARN L191 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 48 [2019-11-07 01:19:18,664 WARN L191 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 43 [2019-11-07 01:19:18,974 WARN L191 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 48 [2019-11-07 01:19:19,247 WARN L191 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 55 [2019-11-07 01:19:19,486 WARN L191 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 47 [2019-11-07 01:19:19,707 WARN L191 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 41 [2019-11-07 01:19:19,967 WARN L191 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 45 [2019-11-07 01:19:20,172 WARN L191 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 43 [2019-11-07 01:19:20,368 WARN L191 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 45 [2019-11-07 01:19:20,529 WARN L191 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 40 [2019-11-07 01:19:20,693 WARN L191 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 39