/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_copy8_ground-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:22:33,512 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2019-11-07 01:22:33,598 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:22:33,601 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:22:33,602 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:22:33,603 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 01:22:33,619 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:22:33,620 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:22:33,621 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:22:33,621 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:22:33,621 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:22:33,622 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:22:33,622 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:22:33,622 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:22:33,622 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:22:33,622 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:22:33,623 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:22:33,623 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:22:33,623 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:22:33,623 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:22:33,623 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:22:33,624 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:22:33,624 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:22:33,624 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:22:33,624 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:22:33,625 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:22:33,625 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:22:33,625 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:22:33,625 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:22:33,625 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:22:33,626 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:22:33,626 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:22:33,626 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:22:33,626 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:22:33,626 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 01:22:33,906 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:22:33,921 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:22:33,925 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:22:33,926 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:22:33,927 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:22:33,928 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_copy8_ground-1.i [2019-11-07 01:22:34,009 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c9c84167/c1f55b41c1cb489eb05f09464f29cf39/FLAGe2d09c8fd [2019-11-07 01:22:34,522 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:22:34,523 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_copy8_ground-1.i [2019-11-07 01:22:34,529 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c9c84167/c1f55b41c1cb489eb05f09464f29cf39/FLAGe2d09c8fd [2019-11-07 01:22:34,914 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c9c84167/c1f55b41c1cb489eb05f09464f29cf39 [2019-11-07 01:22:34,940 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:22:34,947 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:22:34,953 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:22:34,953 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:22:34,960 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:22:34,964 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:22:34" (1/1) ... [2019-11-07 01:22:34,971 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@551dc4a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:34, skipping insertion in model container [2019-11-07 01:22:34,972 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:22:34" (1/1) ... [2019-11-07 01:22:34,992 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:22:35,043 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:22:35,396 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:22:35,411 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:22:35,476 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:22:35,631 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:22:35,632 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:35 WrapperNode [2019-11-07 01:22:35,632 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:22:35,633 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:22:35,633 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:22:35,633 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:22:35,649 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:35" (1/1) ... [2019-11-07 01:22:35,649 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:35" (1/1) ... [2019-11-07 01:22:35,672 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:35" (1/1) ... [2019-11-07 01:22:35,675 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:35" (1/1) ... [2019-11-07 01:22:35,687 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:35" (1/1) ... [2019-11-07 01:22:35,701 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:35" (1/1) ... [2019-11-07 01:22:35,703 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:35" (1/1) ... [2019-11-07 01:22:35,710 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:22:35,714 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:22:35,714 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:22:35,715 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:22:35,716 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:35" (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 01:22:35,806 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:22:35,806 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:22:35,806 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 01:22:35,807 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:22:35,808 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:22:35,809 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 01:22:35,810 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 01:22:35,811 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:22:35,811 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 01:22:35,813 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:22:35,813 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:22:35,814 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:22:35,814 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:22:35,815 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:22:36,521 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:22:36,521 INFO L284 CfgBuilder]: Removed 10 assume(true) statements. [2019-11-07 01:22:36,524 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:22:36 BoogieIcfgContainer [2019-11-07 01:22:36,525 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:22:36,526 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:22:36,526 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:22:36,530 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:22:36,530 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:22:34" (1/3) ... [2019-11-07 01:22:36,532 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69c2e620 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:22:36, skipping insertion in model container [2019-11-07 01:22:36,533 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:22:35" (2/3) ... [2019-11-07 01:22:36,533 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69c2e620 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:22:36, skipping insertion in model container [2019-11-07 01:22:36,533 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:22:36" (3/3) ... [2019-11-07 01:22:36,536 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_copy8_ground-1.i [2019-11-07 01:22:36,546 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:22:36,555 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:22:36,568 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:22:36,597 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:22:36,597 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:22:36,597 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:22:36,597 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:22:36,597 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:22:36,598 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:22:36,598 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:22:36,598 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:22:36,616 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2019-11-07 01:22:36,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-07 01:22:36,623 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:22:36,624 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:22:36,626 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:22:36,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:22:36,632 INFO L82 PathProgramCache]: Analyzing trace with hash 585848073, now seen corresponding path program 1 times [2019-11-07 01:22:36,639 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:22:36,640 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1921375147] [2019-11-07 01:22:36,640 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:22:36,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:36,876 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 01:22:36,877 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1921375147] [2019-11-07 01:22:36,878 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:22:36,879 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:22:36,880 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329091079] [2019-11-07 01:22:36,885 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:22:36,885 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:22:36,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:22:36,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:22:36,899 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 3 states. [2019-11-07 01:22:36,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:22:36,930 INFO L93 Difference]: Finished difference Result 47 states and 68 transitions. [2019-11-07 01:22:36,931 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:22:36,932 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2019-11-07 01:22:36,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:22:36,940 INFO L225 Difference]: With dead ends: 47 [2019-11-07 01:22:36,940 INFO L226 Difference]: Without dead ends: 24 [2019-11-07 01:22:36,944 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 01:22:36,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-07 01:22:36,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-11-07 01:22:36,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-07 01:22:36,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 33 transitions. [2019-11-07 01:22:36,989 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 33 transitions. Word has length 19 [2019-11-07 01:22:36,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:22:36,989 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 33 transitions. [2019-11-07 01:22:36,990 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:22:36,990 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 33 transitions. [2019-11-07 01:22:36,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-07 01:22:36,991 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:22:36,991 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 01:22:36,992 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:22:36,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:22:36,992 INFO L82 PathProgramCache]: Analyzing trace with hash 1643282624, now seen corresponding path program 1 times [2019-11-07 01:22:36,993 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:22:36,993 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1583377582] [2019-11-07 01:22:36,993 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:22:37,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:37,082 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 01:22:37,083 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1583377582] [2019-11-07 01:22:37,083 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:22:37,084 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:22:37,084 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1649115161] [2019-11-07 01:22:37,086 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:22:37,086 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:22:37,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:22:37,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:22:37,087 INFO L87 Difference]: Start difference. First operand 24 states and 33 transitions. Second operand 3 states. [2019-11-07 01:22:37,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:22:37,167 INFO L93 Difference]: Finished difference Result 48 states and 72 transitions. [2019-11-07 01:22:37,169 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:22:37,169 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2019-11-07 01:22:37,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:22:37,170 INFO L225 Difference]: With dead ends: 48 [2019-11-07 01:22:37,170 INFO L226 Difference]: Without dead ends: 32 [2019-11-07 01:22:37,171 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 01:22:37,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-07 01:22:37,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2019-11-07 01:22:37,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-07 01:22:37,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 41 transitions. [2019-11-07 01:22:37,179 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 41 transitions. Word has length 20 [2019-11-07 01:22:37,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:22:37,179 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 41 transitions. [2019-11-07 01:22:37,179 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:22:37,180 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 41 transitions. [2019-11-07 01:22:37,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-11-07 01:22:37,181 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:22:37,181 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:22:37,181 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:22:37,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:22:37,182 INFO L82 PathProgramCache]: Analyzing trace with hash 96487886, now seen corresponding path program 1 times [2019-11-07 01:22:37,182 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:22:37,182 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [184433272] [2019-11-07 01:22:37,182 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:22:37,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:37,286 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-07 01:22:37,286 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [184433272] [2019-11-07 01:22:37,287 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1657723228] [2019-11-07 01:22:37,287 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 01:22:37,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:37,376 INFO L256 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 01:22:37,382 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:22:37,428 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-07 01:22:37,432 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:22:37,493 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-07 01:22:37,494 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [214484773] [2019-11-07 01:22:37,516 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-11-07 01:22:37,517 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:22:37,524 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:22:37,531 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:22:37,531 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:22:37,651 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:22:39,630 WARN L191 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 41 [2019-11-07 01:22:39,710 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:22:39,723 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:22:39,726 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:22:40,038 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:22:40,038 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 18 [2019-11-07 01:22:40,040 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616969268] [2019-11-07 01:22:40,046 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-07 01:22:40,047 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:22:40,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-07 01:22:40,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2019-11-07 01:22:40,048 INFO L87 Difference]: Start difference. First operand 32 states and 41 transitions. Second operand 18 states. [2019-11-07 01:22:40,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:22:40,986 INFO L93 Difference]: Finished difference Result 77 states and 105 transitions. [2019-11-07 01:22:40,987 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-07 01:22:40,987 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 28 [2019-11-07 01:22:40,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:22:40,989 INFO L225 Difference]: With dead ends: 77 [2019-11-07 01:22:40,989 INFO L226 Difference]: Without dead ends: 52 [2019-11-07 01:22:40,991 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=145, Invalid=785, Unknown=0, NotChecked=0, Total=930 [2019-11-07 01:22:40,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-11-07 01:22:41,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 43. [2019-11-07 01:22:41,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-11-07 01:22:41,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 52 transitions. [2019-11-07 01:22:41,002 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 52 transitions. Word has length 28 [2019-11-07 01:22:41,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:22:41,002 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 52 transitions. [2019-11-07 01:22:41,002 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-07 01:22:41,003 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 52 transitions. [2019-11-07 01:22:41,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-07 01:22:41,004 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:22:41,004 INFO L410 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:22:41,207 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:22:41,208 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:22:41,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:22:41,210 INFO L82 PathProgramCache]: Analyzing trace with hash -240069559, now seen corresponding path program 2 times [2019-11-07 01:22:41,210 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:22:41,211 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [747579510] [2019-11-07 01:22:41,211 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:22:41,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:41,432 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2019-11-07 01:22:41,432 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [747579510] [2019-11-07 01:22:41,432 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1164537388] [2019-11-07 01:22:41,432 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 01:22:41,539 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-07 01:22:41,540 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:22:41,542 INFO L256 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-07 01:22:41,554 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:22:41,585 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2019-11-07 01:22:41,586 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:22:41,640 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2019-11-07 01:22:41,641 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1578695867] [2019-11-07 01:22:41,643 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-11-07 01:22:41,643 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:22:41,645 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:22:41,646 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:22:41,646 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:22:41,681 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:22:42,048 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 41 [2019-11-07 01:22:43,415 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:22:43,426 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:22:43,428 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:22:43,645 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:22:43,645 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 11] total 19 [2019-11-07 01:22:43,646 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807439704] [2019-11-07 01:22:43,647 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-07 01:22:43,647 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:22:43,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-07 01:22:43,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2019-11-07 01:22:43,648 INFO L87 Difference]: Start difference. First operand 43 states and 52 transitions. Second operand 19 states. [2019-11-07 01:22:44,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:22:44,512 INFO L93 Difference]: Finished difference Result 114 states and 162 transitions. [2019-11-07 01:22:44,517 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-07 01:22:44,517 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 39 [2019-11-07 01:22:44,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:22:44,518 INFO L225 Difference]: With dead ends: 114 [2019-11-07 01:22:44,518 INFO L226 Difference]: Without dead ends: 84 [2019-11-07 01:22:44,520 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=186, Invalid=806, Unknown=0, NotChecked=0, Total=992 [2019-11-07 01:22:44,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2019-11-07 01:22:44,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 75. [2019-11-07 01:22:44,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2019-11-07 01:22:44,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 84 transitions. [2019-11-07 01:22:44,543 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 84 transitions. Word has length 39 [2019-11-07 01:22:44,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:22:44,545 INFO L462 AbstractCegarLoop]: Abstraction has 75 states and 84 transitions. [2019-11-07 01:22:44,545 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-07 01:22:44,545 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 84 transitions. [2019-11-07 01:22:44,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2019-11-07 01:22:44,550 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:22:44,550 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:22:44,755 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:22:44,756 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:22:44,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:22:44,756 INFO L82 PathProgramCache]: Analyzing trace with hash 1717335881, now seen corresponding path program 3 times [2019-11-07 01:22:44,756 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:22:44,756 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [59182436] [2019-11-07 01:22:44,758 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:22:44,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:44,990 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 168 trivial. 0 not checked. [2019-11-07 01:22:44,990 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [59182436] [2019-11-07 01:22:44,991 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1792531258] [2019-11-07 01:22:44,991 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 01:22:45,114 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:22:45,114 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:22:45,116 INFO L256 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-07 01:22:45,124 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:22:45,134 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 168 trivial. 0 not checked. [2019-11-07 01:22:45,135 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:22:45,193 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 168 trivial. 0 not checked. [2019-11-07 01:22:45,193 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1099394167] [2019-11-07 01:22:45,195 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-11-07 01:22:45,196 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:22:45,196 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:22:45,197 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:22:45,197 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:22:45,214 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:22:45,476 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 38 [2019-11-07 01:22:46,804 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:22:46,810 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:22:46,812 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:22:47,043 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:22:47,043 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 11] total 23 [2019-11-07 01:22:47,044 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609100448] [2019-11-07 01:22:47,045 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-07 01:22:47,045 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:22:47,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-07 01:22:47,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=399, Unknown=0, NotChecked=0, Total=506 [2019-11-07 01:22:47,046 INFO L87 Difference]: Start difference. First operand 75 states and 84 transitions. Second operand 23 states. [2019-11-07 01:22:47,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:22:47,996 INFO L93 Difference]: Finished difference Result 155 states and 178 transitions. [2019-11-07 01:22:47,996 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-07 01:22:47,996 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 71 [2019-11-07 01:22:47,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:22:47,998 INFO L225 Difference]: With dead ends: 155 [2019-11-07 01:22:47,999 INFO L226 Difference]: Without dead ends: 90 [2019-11-07 01:22:48,001 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 199 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 414 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=292, Invalid=1268, Unknown=0, NotChecked=0, Total=1560 [2019-11-07 01:22:48,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2019-11-07 01:22:48,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 81. [2019-11-07 01:22:48,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2019-11-07 01:22:48,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 90 transitions. [2019-11-07 01:22:48,015 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 90 transitions. Word has length 71 [2019-11-07 01:22:48,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:22:48,015 INFO L462 AbstractCegarLoop]: Abstraction has 81 states and 90 transitions. [2019-11-07 01:22:48,015 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-07 01:22:48,015 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 90 transitions. [2019-11-07 01:22:48,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2019-11-07 01:22:48,016 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:22:48,017 INFO L410 BasicCegarLoop]: trace histogram [10, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:22:48,221 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:22:48,221 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:22:48,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:22:48,221 INFO L82 PathProgramCache]: Analyzing trace with hash -407034903, now seen corresponding path program 4 times [2019-11-07 01:22:48,222 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:22:48,222 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1344868273] [2019-11-07 01:22:48,222 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:22:48,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:48,411 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 168 trivial. 0 not checked. [2019-11-07 01:22:48,411 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1344868273] [2019-11-07 01:22:48,411 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [747697063] [2019-11-07 01:22:48,411 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 01:22:48,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:48,532 INFO L256 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-07 01:22:48,535 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:22:48,579 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 168 trivial. 0 not checked. [2019-11-07 01:22:48,579 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:22:48,754 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 168 trivial. 0 not checked. [2019-11-07 01:22:48,755 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [135653465] [2019-11-07 01:22:48,757 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-11-07 01:22:48,757 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:22:48,757 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:22:48,757 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:22:48,758 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:22:48,777 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:22:49,420 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 41 [2019-11-07 01:22:50,515 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:22:50,532 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:22:50,534 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:22:50,788 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:22:50,788 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 11] total 35 [2019-11-07 01:22:50,789 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442446819] [2019-11-07 01:22:50,790 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-11-07 01:22:50,790 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:22:50,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-11-07 01:22:50,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=861, Unknown=0, NotChecked=0, Total=1190 [2019-11-07 01:22:50,791 INFO L87 Difference]: Start difference. First operand 81 states and 90 transitions. Second operand 35 states. [2019-11-07 01:22:52,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:22:52,175 INFO L93 Difference]: Finished difference Result 167 states and 196 transitions. [2019-11-07 01:22:52,175 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-11-07 01:22:52,176 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 77 [2019-11-07 01:22:52,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:22:52,177 INFO L225 Difference]: With dead ends: 167 [2019-11-07 01:22:52,178 INFO L226 Difference]: Without dead ends: 102 [2019-11-07 01:22:52,180 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 211 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1029 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=934, Invalid=3098, Unknown=0, NotChecked=0, Total=4032 [2019-11-07 01:22:52,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2019-11-07 01:22:52,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 93. [2019-11-07 01:22:52,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2019-11-07 01:22:52,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 102 transitions. [2019-11-07 01:22:52,194 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 102 transitions. Word has length 77 [2019-11-07 01:22:52,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:22:52,195 INFO L462 AbstractCegarLoop]: Abstraction has 93 states and 102 transitions. [2019-11-07 01:22:52,195 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-11-07 01:22:52,195 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 102 transitions. [2019-11-07 01:22:52,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2019-11-07 01:22:52,196 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:22:52,196 INFO L410 BasicCegarLoop]: trace histogram [22, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:22:52,400 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:22:52,400 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:22:52,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:22:52,401 INFO L82 PathProgramCache]: Analyzing trace with hash 745837865, now seen corresponding path program 5 times [2019-11-07 01:22:52,401 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:22:52,401 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1487620871] [2019-11-07 01:22:52,401 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:22:52,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:52,885 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 168 trivial. 0 not checked. [2019-11-07 01:22:52,885 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1487620871] [2019-11-07 01:22:52,885 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1763574236] [2019-11-07 01:22:52,885 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 01:22:55,097 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-11-07 01:22:55,097 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:22:55,103 INFO L256 TraceCheckSpWp]: Trace formula consists of 353 conjuncts, 40 conjunts are in the unsatisfiable core [2019-11-07 01:22:55,110 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:22:55,253 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 40 proven. 21 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2019-11-07 01:22:55,253 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:22:55,402 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 388 trivial. 0 not checked. [2019-11-07 01:22:55,402 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [34696483] [2019-11-07 01:22:55,404 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-11-07 01:22:55,404 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:22:55,405 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:22:55,405 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:22:55,405 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:22:55,431 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:22:56,947 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:22:56,951 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:22:56,952 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:22:57,327 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:22:57,327 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 11, 9, 11] total 51 [2019-11-07 01:22:57,327 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219012952] [2019-11-07 01:22:57,328 INFO L442 AbstractCegarLoop]: Interpolant automaton has 51 states [2019-11-07 01:22:57,328 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:22:57,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2019-11-07 01:22:57,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=489, Invalid=2061, Unknown=0, NotChecked=0, Total=2550 [2019-11-07 01:22:57,330 INFO L87 Difference]: Start difference. First operand 93 states and 102 transitions. Second operand 51 states. [2019-11-07 01:23:00,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:23:00,506 INFO L93 Difference]: Finished difference Result 232 states and 314 transitions. [2019-11-07 01:23:00,507 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2019-11-07 01:23:00,507 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 89 [2019-11-07 01:23:00,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:23:00,510 INFO L225 Difference]: With dead ends: 232 [2019-11-07 01:23:00,510 INFO L226 Difference]: Without dead ends: 167 [2019-11-07 01:23:00,515 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 352 GetRequests, 258 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2404 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1508, Invalid=7612, Unknown=0, NotChecked=0, Total=9120 [2019-11-07 01:23:00,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2019-11-07 01:23:00,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 158. [2019-11-07 01:23:00,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2019-11-07 01:23:00,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 167 transitions. [2019-11-07 01:23:00,583 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 167 transitions. Word has length 89 [2019-11-07 01:23:00,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:23:00,585 INFO L462 AbstractCegarLoop]: Abstraction has 158 states and 167 transitions. [2019-11-07 01:23:00,585 INFO L463 AbstractCegarLoop]: Interpolant automaton has 51 states. [2019-11-07 01:23:00,585 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 167 transitions. [2019-11-07 01:23:00,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2019-11-07 01:23:00,588 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:23:00,588 INFO L410 BasicCegarLoop]: trace histogram [23, 14, 14, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:23:00,790 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:23:00,791 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:23:00,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:23:00,792 INFO L82 PathProgramCache]: Analyzing trace with hash 1310060960, now seen corresponding path program 6 times [2019-11-07 01:23:00,792 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:23:00,792 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [251083022] [2019-11-07 01:23:00,792 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:23:01,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:23:01,360 INFO L134 CoverageAnalysis]: Checked inductivity of 1116 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2019-11-07 01:23:01,360 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [251083022] [2019-11-07 01:23:01,360 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [29605989] [2019-11-07 01:23:01,361 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 01:23:01,578 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:23:01,579 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:23:01,581 INFO L256 TraceCheckSpWp]: Trace formula consists of 711 conjuncts, 25 conjunts are in the unsatisfiable core [2019-11-07 01:23:01,586 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:23:01,613 INFO L134 CoverageAnalysis]: Checked inductivity of 1116 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2019-11-07 01:23:01,613 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:23:02,293 INFO L134 CoverageAnalysis]: Checked inductivity of 1116 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2019-11-07 01:23:02,294 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [439660634] [2019-11-07 01:23:02,295 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-11-07 01:23:02,296 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:23:02,296 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:23:02,296 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:23:02,296 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:23:02,317 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:23:02,702 WARN L191 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 38 [2019-11-07 01:23:03,725 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 41 [2019-11-07 01:23:03,942 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 41 [2019-11-07 01:23:03,987 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:23:03,997 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:23:03,999 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:23:04,448 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:23:04,449 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26, 11] total 61 [2019-11-07 01:23:04,449 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [708042041] [2019-11-07 01:23:04,450 INFO L442 AbstractCegarLoop]: Interpolant automaton has 61 states [2019-11-07 01:23:04,450 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:23:04,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2019-11-07 01:23:04,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1304, Invalid=2356, Unknown=0, NotChecked=0, Total=3660 [2019-11-07 01:23:04,452 INFO L87 Difference]: Start difference. First operand 158 states and 167 transitions. Second operand 61 states. [2019-11-07 01:23:07,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:23:07,202 INFO L93 Difference]: Finished difference Result 321 states and 363 transitions. [2019-11-07 01:23:07,203 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2019-11-07 01:23:07,203 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 154 [2019-11-07 01:23:07,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:23:07,206 INFO L225 Difference]: With dead ends: 321 [2019-11-07 01:23:07,206 INFO L226 Difference]: Without dead ends: 192 [2019-11-07 01:23:07,210 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 543 GetRequests, 429 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2979 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=3807, Invalid=9533, Unknown=0, NotChecked=0, Total=13340 [2019-11-07 01:23:07,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2019-11-07 01:23:07,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 183. [2019-11-07 01:23:07,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2019-11-07 01:23:07,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 192 transitions. [2019-11-07 01:23:07,230 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 192 transitions. Word has length 154 [2019-11-07 01:23:07,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:23:07,231 INFO L462 AbstractCegarLoop]: Abstraction has 183 states and 192 transitions. [2019-11-07 01:23:07,231 INFO L463 AbstractCegarLoop]: Interpolant automaton has 61 states. [2019-11-07 01:23:07,231 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 192 transitions. [2019-11-07 01:23:07,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2019-11-07 01:23:07,234 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:23:07,234 INFO L410 BasicCegarLoop]: trace histogram [48, 14, 14, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:23:07,439 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:23:07,439 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:23:07,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:23:07,440 INFO L82 PathProgramCache]: Analyzing trace with hash -201028471, now seen corresponding path program 7 times [2019-11-07 01:23:07,440 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:23:07,440 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1001070211] [2019-11-07 01:23:07,441 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:23:07,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:23:08,700 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2019-11-07 01:23:08,701 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1001070211] [2019-11-07 01:23:08,701 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [915521829] [2019-11-07 01:23:08,701 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 01:23:08,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:23:08,958 INFO L256 TraceCheckSpWp]: Trace formula consists of 861 conjuncts, 50 conjunts are in the unsatisfiable core [2019-11-07 01:23:08,962 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:23:08,987 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2019-11-07 01:23:08,987 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:23:11,631 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2019-11-07 01:23:11,631 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [337262320] [2019-11-07 01:23:11,632 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-11-07 01:23:11,633 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:23:11,633 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:23:11,633 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:23:11,634 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:23:11,648 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:23:12,613 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 41 [2019-11-07 01:23:12,839 WARN L191 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 41 [2019-11-07 01:23:13,058 WARN L191 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 38 [2019-11-07 01:23:13,281 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:23:13,288 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:23:13,290 INFO L180 IcfgInterpreter]: Interpretation finished