/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-examples/standard_init2_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:23:54,681 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 01:23:54,683 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 01:23:54,695 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-07 01:23:54,730 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:23:54,731 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:23:54,731 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:23:54,732 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 01:23:54,747 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:23:54,747 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:23:54,749 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:23:54,749 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:23:54,749 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:23:54,749 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:23:54,749 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:23:54,750 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:23:54,750 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:23:54,750 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:23:54,750 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:23:54,750 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:23:54,751 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:23:54,751 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:23:54,751 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:23:54,751 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:23:54,751 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:23:54,752 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:23:54,752 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:23:54,752 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:23:54,753 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:23:54,753 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:23:54,753 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:23:54,753 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:23:54,754 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:23:54,754 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:23:54,754 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:23:54,754 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:23:54,754 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 01:23:55,060 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:23:55,073 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:23:55,077 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:23:55,079 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:23:55,079 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:23:55,080 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_init2_ground-2.i [2019-11-07 01:23:55,148 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2a5eb6f56/377eaa2615644af58d007c1785dcf204/FLAGfe668ae7f [2019-11-07 01:23:55,654 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:23:55,655 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_init2_ground-2.i [2019-11-07 01:23:55,661 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2a5eb6f56/377eaa2615644af58d007c1785dcf204/FLAGfe668ae7f [2019-11-07 01:23:56,027 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2a5eb6f56/377eaa2615644af58d007c1785dcf204 [2019-11-07 01:23:56,042 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:23:56,052 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:23:56,062 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:23:56,063 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:23:56,069 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:23:56,075 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:23:56" (1/1) ... [2019-11-07 01:23:56,084 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@dd4af8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:23:56, skipping insertion in model container [2019-11-07 01:23:56,087 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:23:56" (1/1) ... [2019-11-07 01:23:56,108 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:23:56,155 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:23:56,449 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:23:56,455 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:23:56,481 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:23:56,505 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:23:56,506 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:23:56 WrapperNode [2019-11-07 01:23:56,506 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:23:56,507 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:23:56,507 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:23:56,507 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:23:56,608 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:23:56" (1/1) ... [2019-11-07 01:23:56,608 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:23:56" (1/1) ... [2019-11-07 01:23:56,618 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:23:56" (1/1) ... [2019-11-07 01:23:56,620 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:23:56" (1/1) ... [2019-11-07 01:23:56,633 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:23:56" (1/1) ... [2019-11-07 01:23:56,641 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:23:56" (1/1) ... [2019-11-07 01:23:56,648 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:23:56" (1/1) ... [2019-11-07 01:23:56,655 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:23:56,656 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:23:56,656 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:23:56,656 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:23:56,657 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:23:56" (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 01:23:56,732 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:23:56,732 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:23:56,732 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 01:23:56,732 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:23:56,733 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:23:56,733 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 01:23:56,734 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:23:56,734 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 01:23:56,735 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:23:56,735 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:23:56,735 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:23:56,736 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:23:56,737 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:23:57,088 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:23:57,088 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-11-07 01:23:57,089 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:23:57 BoogieIcfgContainer [2019-11-07 01:23:57,090 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:23:57,091 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:23:57,091 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:23:57,094 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:23:57,095 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:23:56" (1/3) ... [2019-11-07 01:23:57,095 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a115a1d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:23:57, skipping insertion in model container [2019-11-07 01:23:57,096 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:23:56" (2/3) ... [2019-11-07 01:23:57,096 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a115a1d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:23:57, skipping insertion in model container [2019-11-07 01:23:57,096 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:23:57" (3/3) ... [2019-11-07 01:23:57,098 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_init2_ground-2.i [2019-11-07 01:23:57,109 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:23:57,117 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:23:57,131 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:23:57,164 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:23:57,164 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:23:57,165 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:23:57,166 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:23:57,169 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:23:57,169 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:23:57,169 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:23:57,169 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:23:57,193 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2019-11-07 01:23:57,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-07 01:23:57,200 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:23:57,201 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:23:57,203 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:23:57,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:23:57,208 INFO L82 PathProgramCache]: Analyzing trace with hash 205655519, now seen corresponding path program 1 times [2019-11-07 01:23:57,216 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:23:57,216 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1051157181] [2019-11-07 01:23:57,216 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:23:57,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:23:57,395 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 01:23:57,396 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1051157181] [2019-11-07 01:23:57,397 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:23:57,397 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:23:57,398 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274970211] [2019-11-07 01:23:57,403 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:23:57,404 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:23:57,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:23:57,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:23:57,417 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2019-11-07 01:23:57,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:23:57,468 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2019-11-07 01:23:57,469 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:23:57,470 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-11-07 01:23:57,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:23:57,482 INFO L225 Difference]: With dead ends: 34 [2019-11-07 01:23:57,483 INFO L226 Difference]: Without dead ends: 18 [2019-11-07 01:23:57,489 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 01:23:57,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-11-07 01:23:57,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2019-11-07 01:23:57,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-11-07 01:23:57,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2019-11-07 01:23:57,536 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 12 [2019-11-07 01:23:57,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:23:57,537 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2019-11-07 01:23:57,537 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:23:57,538 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2019-11-07 01:23:57,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-07 01:23:57,538 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:23:57,539 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:23:57,539 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:23:57,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:23:57,539 INFO L82 PathProgramCache]: Analyzing trace with hash -1509760332, now seen corresponding path program 1 times [2019-11-07 01:23:57,540 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:23:57,540 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [537533721] [2019-11-07 01:23:57,540 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:23:57,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:23:57,628 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:23:57,629 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [537533721] [2019-11-07 01:23:57,629 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [178533376] [2019-11-07 01:23:57,629 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 01:23:57,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:23:57,680 INFO L256 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 01:23:57,686 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:23:57,723 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:23:57,723 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:23:57,760 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:23:57,761 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [535900805] [2019-11-07 01:23:57,787 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:23:57,788 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:23:57,795 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:23:57,803 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:23:57,804 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:23:57,967 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:23:58,390 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2019-11-07 01:23:58,410 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:23:58,412 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:23:58,828 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:23:58,829 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 10] total 17 [2019-11-07 01:23:58,831 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1938815835] [2019-11-07 01:23:58,833 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-07 01:23:58,833 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:23:58,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-07 01:23:58,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2019-11-07 01:23:58,838 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 17 states. [2019-11-07 01:23:59,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:23:59,604 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2019-11-07 01:23:59,614 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-07 01:23:59,614 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 14 [2019-11-07 01:23:59,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:23:59,616 INFO L225 Difference]: With dead ends: 44 [2019-11-07 01:23:59,617 INFO L226 Difference]: Without dead ends: 33 [2019-11-07 01:23:59,618 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=141, Invalid=615, Unknown=0, NotChecked=0, Total=756 [2019-11-07 01:23:59,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-11-07 01:23:59,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 24. [2019-11-07 01:23:59,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-07 01:23:59,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2019-11-07 01:23:59,632 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 14 [2019-11-07 01:23:59,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:23:59,633 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2019-11-07 01:23:59,634 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-07 01:23:59,634 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2019-11-07 01:23:59,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-07 01:23:59,640 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:23:59,640 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:23:59,844 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:23:59,845 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:23:59,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:23:59,845 INFO L82 PathProgramCache]: Analyzing trace with hash 1450262815, now seen corresponding path program 2 times [2019-11-07 01:23:59,846 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:23:59,846 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1955930370] [2019-11-07 01:23:59,846 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:23:59,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:23:59,998 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-07 01:24:00,000 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1955930370] [2019-11-07 01:24:00,001 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [431799584] [2019-11-07 01:24:00,001 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 01:24:00,064 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 01:24:00,064 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:24:00,066 INFO L256 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-07 01:24:00,068 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:24:00,089 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-07 01:24:00,090 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:24:00,180 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-07 01:24:00,181 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [727398706] [2019-11-07 01:24:00,182 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:24:00,183 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:24:00,183 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:24:00,184 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:24:00,184 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:24:00,219 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:24:00,456 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2019-11-07 01:24:00,462 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:24:00,464 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:24:00,787 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:24:00,787 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 10] total 23 [2019-11-07 01:24:00,788 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1850537562] [2019-11-07 01:24:00,789 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-07 01:24:00,789 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:24:00,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-07 01:24:00,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=399, Unknown=0, NotChecked=0, Total=506 [2019-11-07 01:24:00,790 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 23 states. [2019-11-07 01:24:01,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:24:01,715 INFO L93 Difference]: Finished difference Result 59 states and 74 transitions. [2019-11-07 01:24:01,719 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-07 01:24:01,719 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 20 [2019-11-07 01:24:01,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:24:01,721 INFO L225 Difference]: With dead ends: 59 [2019-11-07 01:24:01,722 INFO L226 Difference]: Without dead ends: 45 [2019-11-07 01:24:01,723 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 404 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=312, Invalid=1248, Unknown=0, NotChecked=0, Total=1560 [2019-11-07 01:24:01,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2019-11-07 01:24:01,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 36. [2019-11-07 01:24:01,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-07 01:24:01,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2019-11-07 01:24:01,742 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 20 [2019-11-07 01:24:01,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:24:01,742 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2019-11-07 01:24:01,742 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-07 01:24:01,743 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2019-11-07 01:24:01,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-11-07 01:24:01,744 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:24:01,744 INFO L410 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:24:01,948 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:24:01,948 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:24:01,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:24:01,949 INFO L82 PathProgramCache]: Analyzing trace with hash 807641599, now seen corresponding path program 3 times [2019-11-07 01:24:01,949 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:24:01,950 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1414374974] [2019-11-07 01:24:01,950 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:24:02,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:24:02,175 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-11-07 01:24:02,175 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1414374974] [2019-11-07 01:24:02,176 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2038447930] [2019-11-07 01:24:02,176 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 01:24:02,241 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:24:02,241 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:24:02,242 INFO L256 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-07 01:24:02,245 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:24:02,263 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-11-07 01:24:02,263 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:24:02,504 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-11-07 01:24:02,505 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [396816568] [2019-11-07 01:24:02,506 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:24:02,507 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:24:02,507 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:24:02,507 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:24:02,508 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:24:02,535 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:24:02,703 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2019-11-07 01:24:02,710 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:24:02,712 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:24:03,084 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:24:03,085 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 10] total 35 [2019-11-07 01:24:03,085 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302991130] [2019-11-07 01:24:03,086 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-11-07 01:24:03,086 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:24:03,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-11-07 01:24:03,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=861, Unknown=0, NotChecked=0, Total=1190 [2019-11-07 01:24:03,088 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 35 states. [2019-11-07 01:24:04,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:24:04,754 INFO L93 Difference]: Finished difference Result 89 states and 116 transitions. [2019-11-07 01:24:04,755 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-11-07 01:24:04,755 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 32 [2019-11-07 01:24:04,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:24:04,757 INFO L225 Difference]: With dead ends: 89 [2019-11-07 01:24:04,757 INFO L226 Difference]: Without dead ends: 69 [2019-11-07 01:24:04,760 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1007 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=978, Invalid=3054, Unknown=0, NotChecked=0, Total=4032 [2019-11-07 01:24:04,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2019-11-07 01:24:04,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 60. [2019-11-07 01:24:04,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-11-07 01:24:04,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2019-11-07 01:24:04,772 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 32 [2019-11-07 01:24:04,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:24:04,773 INFO L462 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2019-11-07 01:24:04,773 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-11-07 01:24:04,773 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2019-11-07 01:24:04,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-11-07 01:24:04,775 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:24:04,775 INFO L410 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:24:04,979 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:24:04,979 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:24:04,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:24:04,980 INFO L82 PathProgramCache]: Analyzing trace with hash -1094079553, now seen corresponding path program 4 times [2019-11-07 01:24:04,980 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:24:04,980 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [114501213] [2019-11-07 01:24:04,980 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:24:05,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:24:05,441 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2019-11-07 01:24:05,442 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [114501213] [2019-11-07 01:24:05,442 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1378353793] [2019-11-07 01:24:05,442 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 01:24:05,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:24:05,519 INFO L256 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-07 01:24:05,522 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:24:05,537 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2019-11-07 01:24:05,537 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:24:06,304 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2019-11-07 01:24:06,304 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [881761863] [2019-11-07 01:24:06,306 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:24:06,306 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:24:06,306 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:24:06,307 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:24:06,307 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:24:06,338 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:24:06,500 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2019-11-07 01:24:06,508 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:24:06,509 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:24:06,945 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:24:06,946 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25, 10] total 59 [2019-11-07 01:24:06,946 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547198349] [2019-11-07 01:24:06,947 INFO L442 AbstractCegarLoop]: Interpolant automaton has 59 states [2019-11-07 01:24:06,948 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:24:06,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2019-11-07 01:24:06,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1205, Invalid=2217, Unknown=0, NotChecked=0, Total=3422 [2019-11-07 01:24:06,950 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 59 states. [2019-11-07 01:24:10,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:24:10,540 INFO L93 Difference]: Finished difference Result 149 states and 200 transitions. [2019-11-07 01:24:10,540 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2019-11-07 01:24:10,541 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 56 [2019-11-07 01:24:10,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:24:10,544 INFO L225 Difference]: With dead ends: 149 [2019-11-07 01:24:10,544 INFO L226 Difference]: Without dead ends: 117 [2019-11-07 01:24:10,547 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2753 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=3606, Invalid=8826, Unknown=0, NotChecked=0, Total=12432 [2019-11-07 01:24:10,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2019-11-07 01:24:10,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 108. [2019-11-07 01:24:10,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2019-11-07 01:24:10,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 110 transitions. [2019-11-07 01:24:10,565 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 110 transitions. Word has length 56 [2019-11-07 01:24:10,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:24:10,566 INFO L462 AbstractCegarLoop]: Abstraction has 108 states and 110 transitions. [2019-11-07 01:24:10,566 INFO L463 AbstractCegarLoop]: Interpolant automaton has 59 states. [2019-11-07 01:24:10,566 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 110 transitions. [2019-11-07 01:24:10,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2019-11-07 01:24:10,569 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:24:10,570 INFO L410 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:24:10,779 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:24:10,779 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:24:10,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:24:10,780 INFO L82 PathProgramCache]: Analyzing trace with hash 1805836095, now seen corresponding path program 5 times [2019-11-07 01:24:10,780 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:24:10,780 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [266438457] [2019-11-07 01:24:10,780 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:24:10,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:24:11,875 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2019-11-07 01:24:11,875 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [266438457] [2019-11-07 01:24:11,875 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [893024471] [2019-11-07 01:24:11,875 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