/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_const_m2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:19:14,434 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 01:19:14,436 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 01:19:14,450 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-07 01:19:14,450 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-07 01:19:14,452 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-07 01:19:14,454 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-07 01:19:14,463 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-07 01:19:14,465 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-07 01:19:14,466 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-07 01:19:14,468 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-07 01:19:14,469 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-07 01:19:14,469 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 01:19:14,470 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 01:19:14,472 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 01:19:14,473 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 01:19:14,474 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 01:19:14,475 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 01:19:14,479 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 01:19:14,483 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 01:19:14,484 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 01:19:14,485 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 01:19:14,487 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 01:19:14,487 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 01:19:14,491 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 01:19:14,504 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:19:14,507 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:19:14,508 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:19:14,510 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 01:19:14,528 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:19:14,528 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:19:14,529 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:19:14,529 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:19:14,530 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:19:14,530 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:19:14,530 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:19:14,530 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:19:14,530 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:19:14,530 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:19:14,531 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:19:14,531 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:19:14,531 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:19:14,531 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:19:14,531 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:19:14,533 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:19:14,533 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:19:14,533 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:19:14,533 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:19:14,534 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:19:14,534 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:19:14,534 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:19:14,534 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:19:14,535 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:19:14,535 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:19:14,535 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:19:14,536 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:19:14,536 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:19:14,536 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 01:19:14,839 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:19:14,858 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:19:14,861 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:19:14,863 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:19:14,863 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:19:14,864 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-crafted/zero_sum_const_m2.c [2019-11-07 01:19:14,936 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5324ecc32/583f982c634f4ffc9245668490a9ae50/FLAGdff62af52 [2019-11-07 01:19:15,427 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:19:15,428 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-crafted/zero_sum_const_m2.c [2019-11-07 01:19:15,435 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5324ecc32/583f982c634f4ffc9245668490a9ae50/FLAGdff62af52 [2019-11-07 01:19:15,779 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5324ecc32/583f982c634f4ffc9245668490a9ae50 [2019-11-07 01:19:15,787 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:19:15,789 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:19:15,790 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:19:15,790 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:19:15,794 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:19:15,795 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:19:15" (1/1) ... [2019-11-07 01:19:15,797 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@40f8a51a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:15, skipping insertion in model container [2019-11-07 01:19:15,798 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:19:15" (1/1) ... [2019-11-07 01:19:15,805 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:19:15,824 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:19:16,083 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:19:16,097 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:19:16,127 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:19:16,144 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:19:16,145 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:16 WrapperNode [2019-11-07 01:19:16,145 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:19:16,146 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:19:16,146 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:19:16,146 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:19:16,246 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:16" (1/1) ... [2019-11-07 01:19:16,247 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:16" (1/1) ... [2019-11-07 01:19:16,257 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:16" (1/1) ... [2019-11-07 01:19:16,259 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:16" (1/1) ... [2019-11-07 01:19:16,279 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:16" (1/1) ... [2019-11-07 01:19:16,290 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:16" (1/1) ... [2019-11-07 01:19:16,298 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:16" (1/1) ... [2019-11-07 01:19:16,302 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:19:16,303 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:19:16,303 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:19:16,303 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:19:16,304 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:16" (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 01:19:16,364 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:19:16,364 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:19:16,364 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 01:19:16,365 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:19:16,365 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:19:16,365 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-11-07 01:19:16,365 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 01:19:16,365 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_long [2019-11-07 01:19:16,365 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2019-11-07 01:19:16,365 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:19:16,366 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-11-07 01:19:16,366 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:19:16,366 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:19:16,366 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:19:16,366 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:19:16,366 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:19:16,973 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:19:16,974 INFO L284 CfgBuilder]: Removed 5 assume(true) statements. [2019-11-07 01:19:16,975 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:19:16 BoogieIcfgContainer [2019-11-07 01:19:16,975 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:19:16,976 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:19:16,976 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:19:16,979 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:19:16,979 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:19:15" (1/3) ... [2019-11-07 01:19:16,980 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43093c65 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:19:16, skipping insertion in model container [2019-11-07 01:19:16,981 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:16" (2/3) ... [2019-11-07 01:19:16,981 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43093c65 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:19:16, skipping insertion in model container [2019-11-07 01:19:16,981 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:19:16" (3/3) ... [2019-11-07 01:19:16,983 INFO L109 eAbstractionObserver]: Analyzing ICFG zero_sum_const_m2.c [2019-11-07 01:19:16,992 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:19:17,000 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:19:17,011 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:19:17,041 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:19:17,041 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:19:17,042 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:19:17,042 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:19:17,042 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:19:17,042 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:19:17,042 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:19:17,043 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:19:17,058 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2019-11-07 01:19:17,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-07 01:19:17,063 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:17,064 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:17,066 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:17,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:17,070 INFO L82 PathProgramCache]: Analyzing trace with hash -1821330543, now seen corresponding path program 1 times [2019-11-07 01:19:17,078 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:17,078 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [919833916] [2019-11-07 01:19:17,078 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:17,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:17,296 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 01:19:17,298 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [919833916] [2019-11-07 01:19:17,299 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:19:17,299 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-07 01:19:17,301 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721352528] [2019-11-07 01:19:17,307 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-07 01:19:17,307 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:17,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-07 01:19:17,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-07 01:19:17,321 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 5 states. [2019-11-07 01:19:17,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:17,411 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2019-11-07 01:19:17,412 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-07 01:19:17,413 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2019-11-07 01:19:17,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:17,423 INFO L225 Difference]: With dead ends: 41 [2019-11-07 01:19:17,423 INFO L226 Difference]: Without dead ends: 20 [2019-11-07 01:19:17,427 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 01:19:17,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-07 01:19:17,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-11-07 01:19:17,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-07 01:19:17,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 27 transitions. [2019-11-07 01:19:17,468 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 27 transitions. Word has length 15 [2019-11-07 01:19:17,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:17,468 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 27 transitions. [2019-11-07 01:19:17,469 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-07 01:19:17,469 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 27 transitions. [2019-11-07 01:19:17,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-07 01:19:17,470 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:17,470 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:17,470 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:17,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:17,471 INFO L82 PathProgramCache]: Analyzing trace with hash 780224693, now seen corresponding path program 1 times [2019-11-07 01:19:17,471 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:17,472 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [661528465] [2019-11-07 01:19:17,472 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:17,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:17,543 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 01:19:17,544 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [661528465] [2019-11-07 01:19:17,544 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:19:17,544 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:19:17,545 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81228294] [2019-11-07 01:19:17,546 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:19:17,547 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:17,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:19:17,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:19:17,548 INFO L87 Difference]: Start difference. First operand 20 states and 27 transitions. Second operand 3 states. [2019-11-07 01:19:17,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:17,582 INFO L93 Difference]: Finished difference Result 34 states and 48 transitions. [2019-11-07 01:19:17,583 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:19:17,583 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2019-11-07 01:19:17,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:17,584 INFO L225 Difference]: With dead ends: 34 [2019-11-07 01:19:17,584 INFO L226 Difference]: Without dead ends: 21 [2019-11-07 01:19:17,585 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 01:19:17,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-11-07 01:19:17,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-11-07 01:19:17,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-07 01:19:17,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 28 transitions. [2019-11-07 01:19:17,592 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 28 transitions. Word has length 16 [2019-11-07 01:19:17,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:17,592 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 28 transitions. [2019-11-07 01:19:17,592 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:19:17,593 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 28 transitions. [2019-11-07 01:19:17,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-07 01:19:17,593 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:17,594 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 01:19:17,594 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:17,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:17,594 INFO L82 PathProgramCache]: Analyzing trace with hash 2044161761, now seen corresponding path program 1 times [2019-11-07 01:19:17,595 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:17,595 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1077498573] [2019-11-07 01:19:17,595 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:17,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:17,705 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 01:19:17,705 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1077498573] [2019-11-07 01:19:17,705 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:19:17,711 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-07 01:19:17,711 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143138811] [2019-11-07 01:19:17,712 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-07 01:19:17,712 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:17,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-07 01:19:17,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-07 01:19:17,713 INFO L87 Difference]: Start difference. First operand 21 states and 28 transitions. Second operand 4 states. [2019-11-07 01:19:17,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:17,767 INFO L93 Difference]: Finished difference Result 32 states and 44 transitions. [2019-11-07 01:19:17,767 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-07 01:19:17,768 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 17 [2019-11-07 01:19:17,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:17,769 INFO L225 Difference]: With dead ends: 32 [2019-11-07 01:19:17,769 INFO L226 Difference]: Without dead ends: 21 [2019-11-07 01:19:17,769 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 01:19:17,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-11-07 01:19:17,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-11-07 01:19:17,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-07 01:19:17,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2019-11-07 01:19:17,775 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 17 [2019-11-07 01:19:17,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:17,776 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2019-11-07 01:19:17,776 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-07 01:19:17,776 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2019-11-07 01:19:17,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-07 01:19:17,777 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:17,777 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] [2019-11-07 01:19:17,777 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:17,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:17,778 INFO L82 PathProgramCache]: Analyzing trace with hash -791089743, now seen corresponding path program 1 times [2019-11-07 01:19:17,778 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:17,778 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [230429907] [2019-11-07 01:19:17,778 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:17,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:17,837 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:19:17,837 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [230429907] [2019-11-07 01:19:17,837 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1185727893] [2019-11-07 01:19:17,838 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 01:19:17,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:17,907 INFO L256 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-07 01:19:17,913 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:17,959 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:19:17,960 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:18,004 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:19:18,005 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [210441166] [2019-11-07 01:19:18,030 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:19:18,031 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:18,036 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:18,042 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:18,043 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:18,178 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-11-07 01:19:18,739 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:19:18,747 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:19:18,749 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:19,435 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:19,436 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 18 [2019-11-07 01:19:19,437 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713694694] [2019-11-07 01:19:19,438 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-07 01:19:19,438 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:19,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-07 01:19:19,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2019-11-07 01:19:19,439 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 18 states. [2019-11-07 01:19:20,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:20,089 INFO L93 Difference]: Finished difference Result 35 states and 43 transitions. [2019-11-07 01:19:20,089 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-07 01:19:20,090 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 20 [2019-11-07 01:19:20,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:20,091 INFO L225 Difference]: With dead ends: 35 [2019-11-07 01:19:20,091 INFO L226 Difference]: Without dead ends: 22 [2019-11-07 01:19:20,092 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 46 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 01:19:20,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-07 01:19:20,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-11-07 01:19:20,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-11-07 01:19:20,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2019-11-07 01:19:20,098 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 20 [2019-11-07 01:19:20,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:20,099 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2019-11-07 01:19:20,099 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-07 01:19:20,099 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2019-11-07 01:19:20,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-07 01:19:20,100 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:20,102 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] [2019-11-07 01:19:20,305 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:20,306 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:20,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:20,307 INFO L82 PathProgramCache]: Analyzing trace with hash -1692918307, now seen corresponding path program 2 times [2019-11-07 01:19:20,307 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:20,308 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [505964639] [2019-11-07 01:19:20,308 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:20,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:20,381 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 01:19:20,382 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [505964639] [2019-11-07 01:19:20,382 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [67997560] [2019-11-07 01:19:20,382 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 01:19:20,437 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-07 01:19:20,437 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:19:20,439 INFO L256 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-07 01:19:20,443 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:20,468 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 01:19:20,468 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:20,488 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 01:19:20,489 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [606085090] [2019-11-07 01:19:20,491 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:19:20,491 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:20,493 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:20,494 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:20,494 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:20,534 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-11-07 01:19:20,982 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:19:20,989 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:19:20,991 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:21,569 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:21,569 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 11] total 19 [2019-11-07 01:19:21,570 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474228080] [2019-11-07 01:19:21,571 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-07 01:19:21,571 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:21,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-07 01:19:21,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2019-11-07 01:19:21,572 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 19 states. [2019-11-07 01:19:22,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:22,488 INFO L93 Difference]: Finished difference Result 37 states and 47 transitions. [2019-11-07 01:19:22,488 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-07 01:19:22,489 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 21 [2019-11-07 01:19:22,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:22,489 INFO L225 Difference]: With dead ends: 37 [2019-11-07 01:19:22,490 INFO L226 Difference]: Without dead ends: 26 [2019-11-07 01:19:22,491 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 47 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 219 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=143, Invalid=727, Unknown=0, NotChecked=0, Total=870 [2019-11-07 01:19:22,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-11-07 01:19:22,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-11-07 01:19:22,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-11-07 01:19:22,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2019-11-07 01:19:22,498 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 21 [2019-11-07 01:19:22,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:22,498 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2019-11-07 01:19:22,498 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-07 01:19:22,498 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2019-11-07 01:19:22,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-07 01:19:22,499 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:22,499 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:22,703 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:22,703 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:22,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:22,704 INFO L82 PathProgramCache]: Analyzing trace with hash 1878882833, now seen corresponding path program 3 times [2019-11-07 01:19:22,704 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:22,705 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1105881936] [2019-11-07 01:19:22,705 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:22,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:23,645 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:19:23,646 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1105881936] [2019-11-07 01:19:23,646 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1245566704] [2019-11-07 01:19:23,646 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 01:19:23,703 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:19:23,704 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:19:23,705 INFO L256 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 45 conjunts are in the unsatisfiable core [2019-11-07 01:19:23,708 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:24,156 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:19:24,156 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:24,802 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-07 01:19:24,803 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1208625260] [2019-11-07 01:19:24,804 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:19:24,805 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:24,805 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:24,805 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:24,806 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:24,832 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-11-07 01:19:25,167 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:19:25,176 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:19:25,180 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:26,381 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:26,382 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17, 15, 11] total 54 [2019-11-07 01:19:26,382 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1141709562] [2019-11-07 01:19:26,383 INFO L442 AbstractCegarLoop]: Interpolant automaton has 54 states [2019-11-07 01:19:26,383 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:26,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2019-11-07 01:19:26,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=2678, Unknown=0, NotChecked=0, Total=2862 [2019-11-07 01:19:26,385 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand 54 states. [2019-11-07 01:19:29,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:29,294 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2019-11-07 01:19:29,295 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-11-07 01:19:29,295 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 25 [2019-11-07 01:19:29,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:29,296 INFO L225 Difference]: With dead ends: 41 [2019-11-07 01:19:29,296 INFO L226 Difference]: Without dead ends: 36 [2019-11-07 01:19:29,299 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 38 SyntacticMatches, 3 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1529 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=368, Invalid=5332, Unknown=0, NotChecked=0, Total=5700 [2019-11-07 01:19:29,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-11-07 01:19:29,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2019-11-07 01:19:29,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-11-07 01:19:29,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2019-11-07 01:19:29,307 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 25 [2019-11-07 01:19:29,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:29,308 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2019-11-07 01:19:29,308 INFO L463 AbstractCegarLoop]: Interpolant automaton has 54 states. [2019-11-07 01:19:29,308 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2019-11-07 01:19:29,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-11-07 01:19:29,309 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:29,309 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:29,513 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:29,513 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:29,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:29,514 INFO L82 PathProgramCache]: Analyzing trace with hash -220862923, now seen corresponding path program 4 times [2019-11-07 01:19:29,514 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:29,514 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [203611788] [2019-11-07 01:19:29,514 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:29,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:29,687 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-07 01:19:29,687 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [203611788] [2019-11-07 01:19:29,688 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1943710506] [2019-11-07 01:19:29,688 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 01:19:29,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:29,759 INFO L256 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-07 01:19:29,761 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:29,810 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-07 01:19:29,810 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:29,840 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-07 01:19:29,840 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [479713397] [2019-11-07 01:19:29,842 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:19:29,842 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:29,843 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:29,843 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:29,843 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:29,872 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-11-07 01:19:30,163 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:19:30,167 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:19:30,169 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:30,776 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:30,777 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 11] total 24 [2019-11-07 01:19:30,777 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604298806] [2019-11-07 01:19:30,778 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-11-07 01:19:30,779 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:30,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-11-07 01:19:30,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2019-11-07 01:19:30,779 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand 24 states. [2019-11-07 01:19:31,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:31,889 INFO L93 Difference]: Finished difference Result 66 states and 83 transitions. [2019-11-07 01:19:31,890 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-11-07 01:19:31,890 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 26 [2019-11-07 01:19:31,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:31,892 INFO L225 Difference]: With dead ends: 66 [2019-11-07 01:19:31,892 INFO L226 Difference]: Without dead ends: 39 [2019-11-07 01:19:31,893 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 59 SyntacticMatches, 4 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 400 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=219, Invalid=1263, Unknown=0, NotChecked=0, Total=1482 [2019-11-07 01:19:31,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-11-07 01:19:31,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2019-11-07 01:19:31,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-07 01:19:31,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2019-11-07 01:19:31,902 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 26 [2019-11-07 01:19:31,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:31,903 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2019-11-07 01:19:31,903 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-11-07 01:19:31,903 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2019-11-07 01:19:31,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-07 01:19:31,904 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:31,904 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:32,113 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:32,114 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:32,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:32,115 INFO L82 PathProgramCache]: Analyzing trace with hash 344147297, now seen corresponding path program 5 times [2019-11-07 01:19:32,115 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:32,116 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1155160061] [2019-11-07 01:19:32,116 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:32,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:32,192 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 01:19:32,193 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1155160061] [2019-11-07 01:19:32,193 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [414023806] [2019-11-07 01:19:32,193 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 01:19:32,254 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 01:19:32,254 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:19:32,254 INFO L256 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-07 01:19:32,256 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:32,302 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 01:19:32,303 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:32,364 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-07 01:19:32,365 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2034599096] [2019-11-07 01:19:32,368 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:19:32,368 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:32,369 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:32,369 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:32,370 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:32,393 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-11-07 01:19:32,611 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:19:32,615 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:19:32,616 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:33,194 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:33,195 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 11] total 25 [2019-11-07 01:19:33,195 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065432250] [2019-11-07 01:19:33,196 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-07 01:19:33,197 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:33,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-07 01:19:33,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=512, Unknown=0, NotChecked=0, Total=600 [2019-11-07 01:19:33,197 INFO L87 Difference]: Start difference. First operand 36 states and 42 transitions. Second operand 25 states. [2019-11-07 01:19:34,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:34,392 INFO L93 Difference]: Finished difference Result 42 states and 48 transitions. [2019-11-07 01:19:34,392 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-07 01:19:34,393 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 27 [2019-11-07 01:19:34,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:34,394 INFO L225 Difference]: With dead ends: 42 [2019-11-07 01:19:34,394 INFO L226 Difference]: Without dead ends: 31 [2019-11-07 01:19:34,395 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 60 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 01:19:34,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-11-07 01:19:34,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2019-11-07 01:19:34,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-11-07 01:19:34,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2019-11-07 01:19:34,402 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 27 [2019-11-07 01:19:34,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:34,402 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2019-11-07 01:19:34,402 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-07 01:19:34,402 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2019-11-07 01:19:34,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-11-07 01:19:34,403 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:34,403 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:34,609 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:34,609 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:34,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:34,610 INFO L82 PathProgramCache]: Analyzing trace with hash 339030193, now seen corresponding path program 6 times [2019-11-07 01:19:34,610 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:34,610 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2135426556] [2019-11-07 01:19:34,610 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:34,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:35,511 WARN L191 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 39 [2019-11-07 01:19:35,660 WARN L191 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 39 [2019-11-07 01:19:35,817 WARN L191 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 43 [2019-11-07 01:19:36,002 WARN L191 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 43 [2019-11-07 01:19:36,251 WARN L191 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 39 [2019-11-07 01:19:36,412 WARN L191 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 42 [2019-11-07 01:19:37,057 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:19:37,057 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2135426556] [2019-11-07 01:19:37,057 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2023256944] [2019-11-07 01:19:37,057 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 01:19:37,127 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:19:37,127 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:19:37,129 INFO L256 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 63 conjunts are in the unsatisfiable core [2019-11-07 01:19:37,137 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:37,968 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:19:37,968 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:38,906 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 01:19:38,907 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1330811636] [2019-11-07 01:19:38,908 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:19:38,908 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:38,908 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:38,909 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:38,909 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:38,950 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-11-07 01:19:39,247 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:19:39,253 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:19:39,257 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:40,568 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:40,568 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 22, 19, 11] total 69 [2019-11-07 01:19:40,569 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1160914629] [2019-11-07 01:19:40,570 INFO L442 AbstractCegarLoop]: Interpolant automaton has 69 states [2019-11-07 01:19:40,570 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:40,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2019-11-07 01:19:40,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=4447, Unknown=0, NotChecked=0, Total=4692 [2019-11-07 01:19:40,572 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 69 states. [2019-11-07 01:19:41,540 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 61 [2019-11-07 01:19:41,763 WARN L191 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 46 [2019-11-07 01:19:42,105 WARN L191 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 117 DAG size of output: 50 [2019-11-07 01:19:42,362 WARN L191 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 56 [2019-11-07 01:19:42,595 WARN L191 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 50 [2019-11-07 01:19:42,824 WARN L191 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 44 [2019-11-07 01:19:43,505 WARN L191 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 52 [2019-11-07 01:19:43,812 WARN L191 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 95 DAG size of output: 69 [2019-11-07 01:19:44,108 WARN L191 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 55 [2019-11-07 01:19:44,518 WARN L191 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 53 [2019-11-07 01:19:44,814 WARN L191 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 53 [2019-11-07 01:19:45,229 WARN L191 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 53 [2019-11-07 01:19:45,522 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 51 [2019-11-07 01:19:45,724 WARN L191 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 54 [2019-11-07 01:19:46,495 WARN L191 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 131 DAG size of output: 58 [2019-11-07 01:19:46,913 WARN L191 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 100 DAG size of output: 57 [2019-11-07 01:19:49,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:49,325 INFO L93 Difference]: Finished difference Result 63 states and 74 transitions. [2019-11-07 01:19:49,325 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2019-11-07 01:19:49,326 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 30 [2019-11-07 01:19:49,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:49,330 INFO L225 Difference]: With dead ends: 63 [2019-11-07 01:19:49,330 INFO L226 Difference]: Without dead ends: 55 [2019-11-07 01:19:49,336 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 44 SyntacticMatches, 3 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3210 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=852, Invalid=10920, Unknown=0, NotChecked=0, Total=11772 [2019-11-07 01:19:49,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-11-07 01:19:49,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 32. [2019-11-07 01:19:49,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-07 01:19:49,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2019-11-07 01:19:49,357 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 30 [2019-11-07 01:19:49,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:49,357 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2019-11-07 01:19:49,357 INFO L463 AbstractCegarLoop]: Interpolant automaton has 69 states. [2019-11-07 01:19:49,357 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2019-11-07 01:19:49,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-11-07 01:19:49,358 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:49,358 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:49,570 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:49,571 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:49,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:49,571 INFO L82 PathProgramCache]: Analyzing trace with hash 1562119252, now seen corresponding path program 7 times [2019-11-07 01:19:49,571 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:49,571 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [232683146] [2019-11-07 01:19:49,572 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:49,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:49,718 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-11-07 01:19:49,719 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [232683146] [2019-11-07 01:19:49,719 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1552935801] [2019-11-07 01:19:49,719 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 01:19:49,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:49,811 INFO L256 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-07 01:19:49,813 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:49,881 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-11-07 01:19:49,881 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:49,942 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-11-07 01:19:49,943 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [162116659] [2019-11-07 01:19:49,945 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:19:49,945 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:49,946 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:49,946 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:49,946 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:49,983 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-11-07 01:19:50,211 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-11-07 01:19:50,217 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-11-07 01:19:50,220 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:50,838 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:50,838 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11] total 28 [2019-11-07 01:19:50,839 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273288508] [2019-11-07 01:19:50,839 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-11-07 01:19:50,840 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:50,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-11-07 01:19:50,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=643, Unknown=0, NotChecked=0, Total=756 [2019-11-07 01:19:50,841 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand 28 states. [2019-11-07 01:19:51,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:51,992 INFO L93 Difference]: Finished difference Result 71 states and 85 transitions. [2019-11-07 01:19:51,992 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-11-07 01:19:51,992 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 31 [2019-11-07 01:19:51,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:51,993 INFO L225 Difference]: With dead ends: 71 [2019-11-07 01:19:51,994 INFO L226 Difference]: Without dead ends: 36 [2019-11-07 01:19:51,996 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 70 SyntacticMatches, 7 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 643 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=292, Invalid=1688, Unknown=0, NotChecked=0, Total=1980 [2019-11-07 01:19:51,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-11-07 01:19:52,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2019-11-07 01:19:52,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-07 01:19:52,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2019-11-07 01:19:52,007 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 31 [2019-11-07 01:19:52,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:52,007 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2019-11-07 01:19:52,007 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-11-07 01:19:52,007 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2019-11-07 01:19:52,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-11-07 01:19:52,008 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:52,009 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:52,212 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:52,212 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:52,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:52,213 INFO L82 PathProgramCache]: Analyzing trace with hash -1011736431, now seen corresponding path program 8 times [2019-11-07 01:19:52,213 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:52,213 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [444356913] [2019-11-07 01:19:52,213 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:52,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:53,102 WARN L191 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 47 [2019-11-07 01:19:53,514 WARN L191 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 57 [2019-11-07 01:19:53,718 WARN L191 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 61 [2019-11-07 01:19:53,877 WARN L191 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 50 [2019-11-07 01:19:54,036 WARN L191 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 47 [2019-11-07 01:19:54,205 WARN L191 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 43 [2019-11-07 01:19:54,383 WARN L191 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 56 [2019-11-07 01:19:54,534 WARN L191 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 57 [2019-11-07 01:19:55,187 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 1 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:19:55,187 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [444356913] [2019-11-07 01:19:55,188 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [670560551] [2019-11-07 01:19:55,188 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 01:19:55,272 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 01:19:55,272 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:19:55,274 INFO L256 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 84 conjunts are in the unsatisfiable core [2019-11-07 01:19:55,277 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:57,277 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 4 proven. 40 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 01:19:57,277 INFO L321 TraceCheckSpWp]: Computing backward predicates...