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/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf -i ../../../trunk/examples/svcomp/loop-new/count_by_k.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-112bae1 [2019-09-10 02:09:28,289 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-10 02:09:28,290 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-10 02:09:28,302 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-09-10 02:09:28,337 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf [2019-09-10 02:09:28,351 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-10 02:09:28,352 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-10 02:09:28,352 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-10 02:09:28,352 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-10 02:09:28,353 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-10 02:09:28,353 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-10 02:09:28,353 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-10 02:09:28,354 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-10 02:09:28,354 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-10 02:09:28,354 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-10 02:09:28,355 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-10 02:09:28,355 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-10 02:09:28,355 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-10 02:09:28,355 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-10 02:09:28,356 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-10 02:09:28,356 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-10 02:09:28,356 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-10 02:09:28,356 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-10 02:09:28,356 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-10 02:09:28,356 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-10 02:09:28,357 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-10 02:09:28,357 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-10 02:09:28,357 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-10 02:09:28,357 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-10 02:09:28,357 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-10 02:09:28,358 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-10 02:09:28,358 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-10 02:09:28,358 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-10 02:09:28,360 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-10 02:09:28,360 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-10 02:09:28,409 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-10 02:09:28,423 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-10 02:09:28,427 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-10 02:09:28,429 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-10 02:09:28,429 INFO L275 PluginConnector]: CDTParser initialized [2019-09-10 02:09:28,430 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-new/count_by_k.i [2019-09-10 02:09:28,493 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/814afc200/904375f535524856b7caac4a765b8da1/FLAG7ed721ae2 [2019-09-10 02:09:28,921 INFO L306 CDTParser]: Found 1 translation units. [2019-09-10 02:09:28,922 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_k.i [2019-09-10 02:09:28,928 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/814afc200/904375f535524856b7caac4a765b8da1/FLAG7ed721ae2 [2019-09-10 02:09:29,329 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/814afc200/904375f535524856b7caac4a765b8da1 [2019-09-10 02:09:29,341 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-10 02:09:29,343 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-10 02:09:29,346 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-10 02:09:29,346 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-10 02:09:29,350 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-10 02:09:29,351 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.09 02:09:29" (1/1) ... [2019-09-10 02:09:29,354 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c3bfac0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:09:29, skipping insertion in model container [2019-09-10 02:09:29,354 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.09 02:09:29" (1/1) ... [2019-09-10 02:09:29,362 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-10 02:09:29,380 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-10 02:09:29,538 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-10 02:09:29,544 INFO L188 MainTranslator]: Completed pre-run [2019-09-10 02:09:29,566 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-10 02:09:29,583 INFO L192 MainTranslator]: Completed translation [2019-09-10 02:09:29,584 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:09:29 WrapperNode [2019-09-10 02:09:29,584 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-10 02:09:29,584 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-10 02:09:29,585 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-10 02:09:29,585 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-10 02:09:29,683 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:09:29" (1/1) ... [2019-09-10 02:09:29,683 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:09:29" (1/1) ... [2019-09-10 02:09:29,690 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:09:29" (1/1) ... [2019-09-10 02:09:29,691 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:09:29" (1/1) ... [2019-09-10 02:09:29,693 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:09:29" (1/1) ... [2019-09-10 02:09:29,697 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:09:29" (1/1) ... [2019-09-10 02:09:29,698 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:09:29" (1/1) ... [2019-09-10 02:09:29,699 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-10 02:09:29,700 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-10 02:09:29,700 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-10 02:09:29,700 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-10 02:09:29,701 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:09:29" (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 [2019-09-10 02:09:29,750 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-10 02:09:29,750 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-10 02:09:29,750 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-10 02:09:29,750 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-10 02:09:29,751 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-10 02:09:29,751 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-09-10 02:09:29,751 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-10 02:09:29,751 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-09-10 02:09:29,751 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-10 02:09:29,751 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-10 02:09:29,752 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-10 02:09:29,908 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-10 02:09:29,908 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-10 02:09:29,910 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.09 02:09:29 BoogieIcfgContainer [2019-09-10 02:09:29,910 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-10 02:09:29,911 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-10 02:09:29,911 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-10 02:09:29,914 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-10 02:09:29,914 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 10.09 02:09:29" (1/3) ... [2019-09-10 02:09:29,915 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a84d00e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.09 02:09:29, skipping insertion in model container [2019-09-10 02:09:29,915 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 02:09:29" (2/3) ... [2019-09-10 02:09:29,916 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a84d00e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.09 02:09:29, skipping insertion in model container [2019-09-10 02:09:29,916 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.09 02:09:29" (3/3) ... [2019-09-10 02:09:29,917 INFO L109 eAbstractionObserver]: Analyzing ICFG count_by_k.i [2019-09-10 02:09:29,927 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-10 02:09:29,935 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-10 02:09:29,952 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-10 02:09:29,993 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-10 02:09:29,993 INFO L378 AbstractCegarLoop]: Hoare is false [2019-09-10 02:09:29,994 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-10 02:09:29,994 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-10 02:09:29,994 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-10 02:09:29,994 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-10 02:09:29,995 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-10 02:09:29,995 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-10 02:09:30,017 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2019-09-10 02:09:30,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-09-10 02:09:30,030 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:09:30,031 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:09:30,034 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:09:30,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:09:30,041 INFO L82 PathProgramCache]: Analyzing trace with hash -1281911547, now seen corresponding path program 1 times [2019-09-10 02:09:30,044 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:09:30,111 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:30,112 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:09:30,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:30,112 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:09:30,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:09:30,172 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:30,175 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-10 02:09:30,175 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-09-10 02:09:30,175 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-10 02:09:30,179 INFO L454 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-09-10 02:09:30,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-09-10 02:09:30,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-09-10 02:09:30,193 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2019-09-10 02:09:30,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:09:30,207 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2019-09-10 02:09:30,207 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-09-10 02:09:30,208 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2019-09-10 02:09:30,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:09:30,216 INFO L225 Difference]: With dead ends: 20 [2019-09-10 02:09:30,217 INFO L226 Difference]: Without dead ends: 13 [2019-09-10 02:09:30,221 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-09-10 02:09:30,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-09-10 02:09:30,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-09-10 02:09:30,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-09-10 02:09:30,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2019-09-10 02:09:30,260 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2019-09-10 02:09:30,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:09:30,261 INFO L475 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2019-09-10 02:09:30,261 INFO L476 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-09-10 02:09:30,262 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2019-09-10 02:09:30,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-09-10 02:09:30,263 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:09:30,263 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:09:30,264 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:09:30,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:09:30,266 INFO L82 PathProgramCache]: Analyzing trace with hash -1287452673, now seen corresponding path program 1 times [2019-09-10 02:09:30,267 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:09:30,271 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:30,271 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:09:30,271 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:30,271 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:09:30,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:09:30,515 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:30,516 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-10 02:09:30,516 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-09-10 02:09:30,516 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-10 02:09:30,518 INFO L454 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-09-10 02:09:30,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-09-10 02:09:30,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2019-09-10 02:09:30,521 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 6 states. [2019-09-10 02:09:30,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:09:30,590 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2019-09-10 02:09:30,591 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-10 02:09:30,591 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 11 [2019-09-10 02:09:30,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:09:30,592 INFO L225 Difference]: With dead ends: 17 [2019-09-10 02:09:30,592 INFO L226 Difference]: Without dead ends: 14 [2019-09-10 02:09:30,594 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2019-09-10 02:09:30,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-09-10 02:09:30,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-09-10 02:09:30,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-09-10 02:09:30,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2019-09-10 02:09:30,599 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2019-09-10 02:09:30,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:09:30,599 INFO L475 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2019-09-10 02:09:30,600 INFO L476 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-09-10 02:09:30,600 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2019-09-10 02:09:30,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-09-10 02:09:30,601 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:09:30,601 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:09:30,601 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:09:30,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:09:30,602 INFO L82 PathProgramCache]: Analyzing trace with hash 843923389, now seen corresponding path program 1 times [2019-09-10 02:09:30,602 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:09:30,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:30,603 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:09:30,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:30,604 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:09:30,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:09:30,725 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:30,725 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:09:30,725 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:09:30,726 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2019-09-10 02:09:30,728 INFO L207 CegarAbsIntRunner]: [0], [4], [8], [14], [16], [18], [25], [28], [30], [36], [37], [38], [40] [2019-09-10 02:09:30,764 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-10 02:09:30,765 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-10 02:09:30,895 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-10 02:09:30,898 INFO L272 AbstractInterpreter]: Visited 13 different actions 41 times. Merged at 3 different actions 12 times. Widened at 1 different actions 2 times. Performed 47 root evaluator evaluations with a maximum evaluation depth of 5. Performed 47 inverse root evaluator evaluations with a maximum inverse evaluation depth of 5. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2019-09-10 02:09:30,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:09:30,902 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-10 02:09:30,902 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:09:30,902 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:09:30,920 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:09:30,921 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-10 02:09:30,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:09:30,937 INFO L256 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2019-09-10 02:09:30,942 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:09:31,047 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:31,047 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:09:31,153 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:31,157 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:09:31,157 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 13 [2019-09-10 02:09:31,157 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:09:31,158 INFO L454 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-09-10 02:09:31,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-09-10 02:09:31,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2019-09-10 02:09:31,159 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 10 states. [2019-09-10 02:09:31,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:09:31,333 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2019-09-10 02:09:31,334 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-09-10 02:09:31,334 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 13 [2019-09-10 02:09:31,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:09:31,335 INFO L225 Difference]: With dead ends: 24 [2019-09-10 02:09:31,335 INFO L226 Difference]: Without dead ends: 20 [2019-09-10 02:09:31,336 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2019-09-10 02:09:31,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-09-10 02:09:31,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-09-10 02:09:31,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-09-10 02:09:31,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2019-09-10 02:09:31,341 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 13 [2019-09-10 02:09:31,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:09:31,341 INFO L475 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2019-09-10 02:09:31,342 INFO L476 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-09-10 02:09:31,342 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2019-09-10 02:09:31,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-09-10 02:09:31,343 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:09:31,343 INFO L399 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:09:31,343 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:09:31,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:09:31,344 INFO L82 PathProgramCache]: Analyzing trace with hash 1549375991, now seen corresponding path program 2 times [2019-09-10 02:09:31,344 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:09:31,345 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:31,345 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:09:31,346 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:31,346 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:09:31,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:09:31,473 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:31,473 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:09:31,473 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:09:31,474 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:09:31,474 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:09:31,474 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:09:31,474 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-10 02:09:31,493 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-10 02:09:31,493 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:09:31,510 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-09-10 02:09:31,511 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-10 02:09:31,511 INFO L256 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 7 conjunts are in the unsatisfiable core [2019-09-10 02:09:31,513 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:09:31,584 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:31,584 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:09:31,712 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:31,716 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:09:31,716 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2019-09-10 02:09:31,716 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:09:31,717 INFO L454 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-09-10 02:09:31,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-09-10 02:09:31,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2019-09-10 02:09:31,718 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 11 states. [2019-09-10 02:09:31,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:09:31,929 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2019-09-10 02:09:31,929 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-09-10 02:09:31,930 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 19 [2019-09-10 02:09:31,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:09:31,930 INFO L225 Difference]: With dead ends: 28 [2019-09-10 02:09:31,931 INFO L226 Difference]: Without dead ends: 28 [2019-09-10 02:09:31,931 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=151, Invalid=311, Unknown=0, NotChecked=0, Total=462 [2019-09-10 02:09:31,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-09-10 02:09:31,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-09-10 02:09:31,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-09-10 02:09:31,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2019-09-10 02:09:31,939 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 19 [2019-09-10 02:09:31,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:09:31,940 INFO L475 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2019-09-10 02:09:31,940 INFO L476 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-09-10 02:09:31,941 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2019-09-10 02:09:31,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-09-10 02:09:31,942 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:09:31,943 INFO L399 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:09:31,943 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:09:31,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:09:31,944 INFO L82 PathProgramCache]: Analyzing trace with hash -191187985, now seen corresponding path program 3 times [2019-09-10 02:09:31,944 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:09:31,945 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:31,945 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-10 02:09:31,946 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:31,946 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:09:31,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:09:32,146 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:32,146 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:09:32,146 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:09:32,147 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:09:32,147 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:09:32,147 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:09:32,147 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-10 02:09:32,170 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-10 02:09:32,170 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:09:32,185 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-10 02:09:32,185 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-10 02:09:32,187 INFO L256 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 11 conjunts are in the unsatisfiable core [2019-09-10 02:09:32,189 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:09:32,278 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:32,278 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:09:32,529 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:32,533 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:09:32,533 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2019-09-10 02:09:32,533 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:09:32,534 INFO L454 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-09-10 02:09:32,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-09-10 02:09:32,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=354, Unknown=0, NotChecked=0, Total=506 [2019-09-10 02:09:32,535 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 15 states. [2019-09-10 02:09:32,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:09:32,894 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2019-09-10 02:09:32,894 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-09-10 02:09:32,895 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 27 [2019-09-10 02:09:32,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:09:32,896 INFO L225 Difference]: With dead ends: 36 [2019-09-10 02:09:32,896 INFO L226 Difference]: Without dead ends: 36 [2019-09-10 02:09:32,897 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=373, Invalid=749, Unknown=0, NotChecked=0, Total=1122 [2019-09-10 02:09:32,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-09-10 02:09:32,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2019-09-10 02:09:32,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-09-10 02:09:32,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2019-09-10 02:09:32,902 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 27 [2019-09-10 02:09:32,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:09:32,902 INFO L475 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2019-09-10 02:09:32,902 INFO L476 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-09-10 02:09:32,903 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2019-09-10 02:09:32,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-09-10 02:09:32,904 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:09:32,904 INFO L399 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:09:32,904 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:09:32,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:09:32,905 INFO L82 PathProgramCache]: Analyzing trace with hash 217994727, now seen corresponding path program 4 times [2019-09-10 02:09:32,905 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:09:32,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:32,906 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-10 02:09:32,906 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:32,906 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:09:32,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:09:33,098 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:33,098 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:09:33,098 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:09:33,098 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:09:33,099 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:09:33,099 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:09:33,099 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:09:33,119 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:09:33,119 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-10 02:09:33,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:09:33,138 INFO L256 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 15 conjunts are in the unsatisfiable core [2019-09-10 02:09:33,140 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:09:33,222 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:33,222 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:09:33,624 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:33,627 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:09:33,628 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2019-09-10 02:09:33,628 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:09:33,628 INFO L454 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-09-10 02:09:33,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-09-10 02:09:33,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=640, Unknown=0, NotChecked=0, Total=930 [2019-09-10 02:09:33,629 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 19 states. [2019-09-10 02:09:34,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:09:34,181 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2019-09-10 02:09:34,183 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-09-10 02:09:34,183 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 35 [2019-09-10 02:09:34,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:09:34,184 INFO L225 Difference]: With dead ends: 44 [2019-09-10 02:09:34,184 INFO L226 Difference]: Without dead ends: 44 [2019-09-10 02:09:34,185 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 228 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=707, Invalid=1363, Unknown=0, NotChecked=0, Total=2070 [2019-09-10 02:09:34,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-09-10 02:09:34,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2019-09-10 02:09:34,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-09-10 02:09:34,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2019-09-10 02:09:34,191 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 35 [2019-09-10 02:09:34,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:09:34,192 INFO L475 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2019-09-10 02:09:34,192 INFO L476 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-09-10 02:09:34,192 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2019-09-10 02:09:34,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-09-10 02:09:34,193 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:09:34,193 INFO L399 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:09:34,194 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:09:34,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:09:34,194 INFO L82 PathProgramCache]: Analyzing trace with hash -1099137057, now seen corresponding path program 5 times [2019-09-10 02:09:34,194 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:09:34,195 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:34,195 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:09:34,195 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:34,195 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:09:34,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:09:34,488 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:34,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:09:34,489 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:09:34,489 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:09:34,489 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:09:34,489 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:09:34,489 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:09:34,504 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-10 02:09:34,505 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-10 02:09:34,532 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2019-09-10 02:09:34,532 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-10 02:09:34,533 INFO L256 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 19 conjunts are in the unsatisfiable core [2019-09-10 02:09:34,536 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:09:34,663 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:34,663 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:09:35,255 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:35,263 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:09:35,264 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2019-09-10 02:09:35,264 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:09:35,264 INFO L454 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-09-10 02:09:35,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-09-10 02:09:35,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=476, Invalid=1006, Unknown=0, NotChecked=0, Total=1482 [2019-09-10 02:09:35,266 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 23 states. [2019-09-10 02:09:36,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:09:36,119 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2019-09-10 02:09:36,121 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-09-10 02:09:36,121 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 43 [2019-09-10 02:09:36,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:09:36,122 INFO L225 Difference]: With dead ends: 52 [2019-09-10 02:09:36,122 INFO L226 Difference]: Without dead ends: 52 [2019-09-10 02:09:36,124 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 334 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1153, Invalid=2153, Unknown=0, NotChecked=0, Total=3306 [2019-09-10 02:09:36,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-09-10 02:09:36,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2019-09-10 02:09:36,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-09-10 02:09:36,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2019-09-10 02:09:36,136 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 43 [2019-09-10 02:09:36,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:09:36,136 INFO L475 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2019-09-10 02:09:36,136 INFO L476 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-09-10 02:09:36,137 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2019-09-10 02:09:36,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-09-10 02:09:36,138 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:09:36,138 INFO L399 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:09:36,142 INFO L418 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:09:36,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:09:36,142 INFO L82 PathProgramCache]: Analyzing trace with hash -1441975849, now seen corresponding path program 6 times [2019-09-10 02:09:36,142 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:09:36,143 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:36,143 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-10 02:09:36,143 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:36,143 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:09:36,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:09:36,538 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:36,538 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:09:36,538 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:09:36,539 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:09:36,539 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:09:36,539 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:09:36,539 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-10 02:09:36,556 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-10 02:09:36,557 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:09:36,579 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-10 02:09:36,579 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-10 02:09:36,584 INFO L256 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 23 conjunts are in the unsatisfiable core [2019-09-10 02:09:36,586 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:09:36,680 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:36,680 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:09:37,449 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:37,452 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:09:37,452 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2019-09-10 02:09:37,452 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:09:37,453 INFO L454 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-09-10 02:09:37,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-09-10 02:09:37,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=710, Invalid=1452, Unknown=0, NotChecked=0, Total=2162 [2019-09-10 02:09:37,454 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 27 states. [2019-09-10 02:09:38,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:09:38,568 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2019-09-10 02:09:38,571 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-09-10 02:09:38,571 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 51 [2019-09-10 02:09:38,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:09:38,572 INFO L225 Difference]: With dead ends: 60 [2019-09-10 02:09:38,572 INFO L226 Difference]: Without dead ends: 60 [2019-09-10 02:09:38,574 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 78 SyntacticMatches, 2 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 456 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1711, Invalid=3119, Unknown=0, NotChecked=0, Total=4830 [2019-09-10 02:09:38,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-09-10 02:09:38,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2019-09-10 02:09:38,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-09-10 02:09:38,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2019-09-10 02:09:38,580 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 51 [2019-09-10 02:09:38,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:09:38,580 INFO L475 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2019-09-10 02:09:38,580 INFO L476 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-09-10 02:09:38,580 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2019-09-10 02:09:38,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2019-09-10 02:09:38,581 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:09:38,581 INFO L399 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:09:38,582 INFO L418 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:09:38,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:09:38,582 INFO L82 PathProgramCache]: Analyzing trace with hash -123180081, now seen corresponding path program 7 times [2019-09-10 02:09:38,582 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:09:38,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:38,583 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-10 02:09:38,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:38,583 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:09:38,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:09:39,090 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:39,090 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:09:39,090 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:09:39,090 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:09:39,091 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:09:39,091 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:09:39,091 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:09:39,105 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:09:39,105 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-10 02:09:39,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:09:39,158 INFO L256 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 27 conjunts are in the unsatisfiable core [2019-09-10 02:09:39,162 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:09:39,288 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:39,289 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:09:40,347 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (8)] Exception during sending of exit command (exit): Stream closed [2019-09-10 02:09:40,360 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:09:40,360 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2019-09-10 02:09:40,361 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:09:40,362 INFO L454 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-09-10 02:09:40,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-09-10 02:09:40,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=992, Invalid=1978, Unknown=0, NotChecked=0, Total=2970 [2019-09-10 02:09:40,364 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 31 states. [2019-09-10 02:09:41,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:09:41,924 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2019-09-10 02:09:41,924 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-09-10 02:09:41,924 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 59 [2019-09-10 02:09:41,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:09:41,925 INFO L225 Difference]: With dead ends: 68 [2019-09-10 02:09:41,925 INFO L226 Difference]: Without dead ends: 68 [2019-09-10 02:09:41,930 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 594 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=2381, Invalid=4261, Unknown=0, NotChecked=0, Total=6642 [2019-09-10 02:09:41,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-09-10 02:09:41,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2019-09-10 02:09:41,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2019-09-10 02:09:41,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 68 transitions. [2019-09-10 02:09:41,944 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 68 transitions. Word has length 59 [2019-09-10 02:09:41,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:09:41,945 INFO L475 AbstractCegarLoop]: Abstraction has 68 states and 68 transitions. [2019-09-10 02:09:41,945 INFO L476 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-09-10 02:09:41,945 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 68 transitions. [2019-09-10 02:09:41,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-09-10 02:09:41,946 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:09:41,946 INFO L399 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:09:41,947 INFO L418 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:09:41,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:09:41,947 INFO L82 PathProgramCache]: Analyzing trace with hash 1531325895, now seen corresponding path program 8 times [2019-09-10 02:09:41,948 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:09:41,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:41,949 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:09:41,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:41,949 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:09:42,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:09:42,568 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:42,568 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:09:42,568 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:09:42,568 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:09:42,569 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:09:42,569 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:09:42,569 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:09:42,584 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-10 02:09:42,584 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-10 02:09:42,637 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2019-09-10 02:09:42,637 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-10 02:09:42,639 INFO L256 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 31 conjunts are in the unsatisfiable core [2019-09-10 02:09:42,651 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:09:42,825 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:42,826 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:09:44,301 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:44,304 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:09:44,304 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2019-09-10 02:09:44,304 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:09:44,305 INFO L454 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-09-10 02:09:44,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-09-10 02:09:44,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1322, Invalid=2584, Unknown=0, NotChecked=0, Total=3906 [2019-09-10 02:09:44,306 INFO L87 Difference]: Start difference. First operand 68 states and 68 transitions. Second operand 35 states. [2019-09-10 02:09:46,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:09:46,499 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2019-09-10 02:09:46,499 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-09-10 02:09:46,499 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 67 [2019-09-10 02:09:46,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:09:46,501 INFO L225 Difference]: With dead ends: 76 [2019-09-10 02:09:46,501 INFO L226 Difference]: Without dead ends: 76 [2019-09-10 02:09:46,504 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 102 SyntacticMatches, 2 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 748 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=3163, Invalid=5579, Unknown=0, NotChecked=0, Total=8742 [2019-09-10 02:09:46,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-09-10 02:09:46,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2019-09-10 02:09:46,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-09-10 02:09:46,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 76 transitions. [2019-09-10 02:09:46,510 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 76 transitions. Word has length 67 [2019-09-10 02:09:46,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:09:46,510 INFO L475 AbstractCegarLoop]: Abstraction has 76 states and 76 transitions. [2019-09-10 02:09:46,511 INFO L476 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-09-10 02:09:46,511 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 76 transitions. [2019-09-10 02:09:46,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-09-10 02:09:46,512 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:09:46,512 INFO L399 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:09:46,512 INFO L418 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:09:46,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:09:46,513 INFO L82 PathProgramCache]: Analyzing trace with hash 182351807, now seen corresponding path program 9 times [2019-09-10 02:09:46,513 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:09:46,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:46,514 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-10 02:09:46,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:46,514 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:09:46,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:09:47,205 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:47,205 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:09:47,205 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:09:47,205 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:09:47,206 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:09:47,206 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:09:47,206 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:09:47,217 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-10 02:09:47,217 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-10 02:09:47,252 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-10 02:09:47,252 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-10 02:09:47,256 INFO L256 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 35 conjunts are in the unsatisfiable core [2019-09-10 02:09:47,259 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:09:47,392 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:47,393 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:09:49,025 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:49,028 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:09:49,028 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 71 [2019-09-10 02:09:49,029 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:09:49,029 INFO L454 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-09-10 02:09:49,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-09-10 02:09:49,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1700, Invalid=3270, Unknown=0, NotChecked=0, Total=4970 [2019-09-10 02:09:49,031 INFO L87 Difference]: Start difference. First operand 76 states and 76 transitions. Second operand 39 states. [2019-09-10 02:09:51,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:09:51,727 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2019-09-10 02:09:51,727 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-09-10 02:09:51,728 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 75 [2019-09-10 02:09:51,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:09:51,728 INFO L225 Difference]: With dead ends: 84 [2019-09-10 02:09:51,728 INFO L226 Difference]: Without dead ends: 84 [2019-09-10 02:09:51,732 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 114 SyntacticMatches, 2 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 918 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=4057, Invalid=7073, Unknown=0, NotChecked=0, Total=11130 [2019-09-10 02:09:51,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2019-09-10 02:09:51,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2019-09-10 02:09:51,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2019-09-10 02:09:51,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 84 transitions. [2019-09-10 02:09:51,740 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 84 transitions. Word has length 75 [2019-09-10 02:09:51,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:09:51,740 INFO L475 AbstractCegarLoop]: Abstraction has 84 states and 84 transitions. [2019-09-10 02:09:51,740 INFO L476 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-09-10 02:09:51,740 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 84 transitions. [2019-09-10 02:09:51,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2019-09-10 02:09:51,742 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:09:51,742 INFO L399 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:09:51,742 INFO L418 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:09:51,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:09:51,742 INFO L82 PathProgramCache]: Analyzing trace with hash -932623945, now seen corresponding path program 10 times [2019-09-10 02:09:51,743 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:09:51,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:51,743 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-10 02:09:51,744 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:51,744 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:09:51,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:09:52,572 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:52,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:09:52,573 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:09:52,573 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:09:52,573 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:09:52,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:09:52,573 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:09:52,585 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:09:52,585 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-10 02:09:52,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:09:52,701 INFO L256 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 39 conjunts are in the unsatisfiable core [2019-09-10 02:09:52,704 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:09:52,843 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:52,843 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:09:54,837 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (11)] Exception during sending of exit command (exit): Broken pipe [2019-09-10 02:09:54,846 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:09:54,846 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2019-09-10 02:09:54,846 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:09:54,847 INFO L454 AbstractCegarLoop]: Interpolant automaton has 43 states [2019-09-10 02:09:54,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2019-09-10 02:09:54,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2126, Invalid=4036, Unknown=0, NotChecked=0, Total=6162 [2019-09-10 02:09:54,849 INFO L87 Difference]: Start difference. First operand 84 states and 84 transitions. Second operand 43 states. [2019-09-10 02:09:58,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:09:58,132 INFO L93 Difference]: Finished difference Result 92 states and 92 transitions. [2019-09-10 02:09:58,134 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2019-09-10 02:09:58,134 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 83 [2019-09-10 02:09:58,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:09:58,135 INFO L225 Difference]: With dead ends: 92 [2019-09-10 02:09:58,135 INFO L226 Difference]: Without dead ends: 92 [2019-09-10 02:09:58,137 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 126 SyntacticMatches, 2 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1104 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=5063, Invalid=8743, Unknown=0, NotChecked=0, Total=13806 [2019-09-10 02:09:58,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2019-09-10 02:09:58,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2019-09-10 02:09:58,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2019-09-10 02:09:58,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 92 transitions. [2019-09-10 02:09:58,143 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 92 transitions. Word has length 83 [2019-09-10 02:09:58,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:09:58,144 INFO L475 AbstractCegarLoop]: Abstraction has 92 states and 92 transitions. [2019-09-10 02:09:58,144 INFO L476 AbstractCegarLoop]: Interpolant automaton has 43 states. [2019-09-10 02:09:58,144 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 92 transitions. [2019-09-10 02:09:58,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2019-09-10 02:09:58,145 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:09:58,146 INFO L399 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:09:58,146 INFO L418 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:09:58,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:09:58,151 INFO L82 PathProgramCache]: Analyzing trace with hash -589388881, now seen corresponding path program 11 times [2019-09-10 02:09:58,151 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:09:58,151 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:58,152 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:09:58,152 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:09:58,152 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:09:58,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:09:59,133 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:59,133 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:09:59,133 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:09:59,133 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:09:59,133 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:09:59,134 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:09:59,134 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:09:59,144 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-10 02:09:59,144 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-10 02:09:59,194 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2019-09-10 02:09:59,194 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-10 02:09:59,196 INFO L256 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 43 conjunts are in the unsatisfiable core [2019-09-10 02:09:59,198 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:09:59,378 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:09:59,378 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:10:01,704 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:10:01,707 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:10:01,707 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 87 [2019-09-10 02:10:01,707 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:10:01,708 INFO L454 AbstractCegarLoop]: Interpolant automaton has 47 states [2019-09-10 02:10:01,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2019-09-10 02:10:01,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2600, Invalid=4882, Unknown=0, NotChecked=0, Total=7482 [2019-09-10 02:10:01,709 INFO L87 Difference]: Start difference. First operand 92 states and 92 transitions. Second operand 47 states. [2019-09-10 02:10:05,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:10:05,824 INFO L93 Difference]: Finished difference Result 100 states and 100 transitions. [2019-09-10 02:10:05,824 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2019-09-10 02:10:05,824 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 91 [2019-09-10 02:10:05,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:10:05,826 INFO L225 Difference]: With dead ends: 100 [2019-09-10 02:10:05,826 INFO L226 Difference]: Without dead ends: 100 [2019-09-10 02:10:05,827 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 138 SyntacticMatches, 2 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1306 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=6181, Invalid=10589, Unknown=0, NotChecked=0, Total=16770 [2019-09-10 02:10:05,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2019-09-10 02:10:05,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2019-09-10 02:10:05,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2019-09-10 02:10:05,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 100 transitions. [2019-09-10 02:10:05,834 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 100 transitions. Word has length 91 [2019-09-10 02:10:05,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:10:05,835 INFO L475 AbstractCegarLoop]: Abstraction has 100 states and 100 transitions. [2019-09-10 02:10:05,835 INFO L476 AbstractCegarLoop]: Interpolant automaton has 47 states. [2019-09-10 02:10:05,835 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 100 transitions. [2019-09-10 02:10:05,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2019-09-10 02:10:05,836 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:10:05,837 INFO L399 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:10:05,837 INFO L418 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:10:05,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:10:05,837 INFO L82 PathProgramCache]: Analyzing trace with hash 423003559, now seen corresponding path program 12 times [2019-09-10 02:10:05,837 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:10:05,838 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:10:05,838 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-10 02:10:05,838 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:10:05,838 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:10:05,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:10:06,946 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:10:06,946 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:10:06,946 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:10:06,946 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:10:06,946 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:10:06,946 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:10:06,947 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:10:06,956 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-10 02:10:06,956 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-10 02:10:07,030 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-10 02:10:07,030 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-10 02:10:07,058 INFO L256 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 47 conjunts are in the unsatisfiable core [2019-09-10 02:10:07,059 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:10:07,213 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:10:07,214 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:10:09,976 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:10:09,979 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:10:09,980 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 95 [2019-09-10 02:10:09,980 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:10:09,981 INFO L454 AbstractCegarLoop]: Interpolant automaton has 51 states [2019-09-10 02:10:09,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2019-09-10 02:10:09,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3122, Invalid=5808, Unknown=0, NotChecked=0, Total=8930 [2019-09-10 02:10:09,983 INFO L87 Difference]: Start difference. First operand 100 states and 100 transitions. Second operand 51 states. [2019-09-10 02:10:10,376 WARN L188 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 141 DAG size of output: 9 [2019-09-10 02:10:10,614 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 11 [2019-09-10 02:10:15,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:10:15,082 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2019-09-10 02:10:15,086 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2019-09-10 02:10:15,086 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 99 [2019-09-10 02:10:15,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:10:15,087 INFO L225 Difference]: With dead ends: 108 [2019-09-10 02:10:15,088 INFO L226 Difference]: Without dead ends: 108 [2019-09-10 02:10:15,089 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 150 SyntacticMatches, 2 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1524 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=7411, Invalid=12611, Unknown=0, NotChecked=0, Total=20022 [2019-09-10 02:10:15,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2019-09-10 02:10:15,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2019-09-10 02:10:15,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2019-09-10 02:10:15,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 108 transitions. [2019-09-10 02:10:15,104 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 108 transitions. Word has length 99 [2019-09-10 02:10:15,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:10:15,105 INFO L475 AbstractCegarLoop]: Abstraction has 108 states and 108 transitions. [2019-09-10 02:10:15,105 INFO L476 AbstractCegarLoop]: Interpolant automaton has 51 states. [2019-09-10 02:10:15,105 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 108 transitions. [2019-09-10 02:10:15,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2019-09-10 02:10:15,108 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:10:15,108 INFO L399 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:10:15,109 INFO L418 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:10:15,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:10:15,109 INFO L82 PathProgramCache]: Analyzing trace with hash -697765985, now seen corresponding path program 13 times [2019-09-10 02:10:15,109 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:10:15,110 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:10:15,110 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-10 02:10:15,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:10:15,112 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:10:15,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:10:16,602 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:10:16,603 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:10:16,603 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:10:16,603 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:10:16,603 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:10:16,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:10:16,604 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-10 02:10:16,619 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:10:16,619 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:10:16,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:10:16,802 INFO L256 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 51 conjunts are in the unsatisfiable core [2019-09-10 02:10:16,804 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:10:17,054 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:10:17,054 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:10:20,323 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:10:20,325 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:10:20,326 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 103 [2019-09-10 02:10:20,326 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:10:20,326 INFO L454 AbstractCegarLoop]: Interpolant automaton has 55 states [2019-09-10 02:10:20,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2019-09-10 02:10:20,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3692, Invalid=6814, Unknown=0, NotChecked=0, Total=10506 [2019-09-10 02:10:20,328 INFO L87 Difference]: Start difference. First operand 108 states and 108 transitions. Second operand 55 states. [2019-09-10 02:10:20,744 WARN L188 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 9 [2019-09-10 02:10:20,882 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-10 02:10:21,018 WARN L188 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-10 02:10:21,148 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-10 02:10:21,285 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2019-09-10 02:10:26,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:10:26,442 INFO L93 Difference]: Finished difference Result 116 states and 116 transitions. [2019-09-10 02:10:26,442 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2019-09-10 02:10:26,443 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 107 [2019-09-10 02:10:26,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:10:26,444 INFO L225 Difference]: With dead ends: 116 [2019-09-10 02:10:26,444 INFO L226 Difference]: Without dead ends: 116 [2019-09-10 02:10:26,446 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 162 SyntacticMatches, 2 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1758 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=8753, Invalid=14809, Unknown=0, NotChecked=0, Total=23562 [2019-09-10 02:10:26,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2019-09-10 02:10:26,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2019-09-10 02:10:26,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2019-09-10 02:10:26,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 116 transitions. [2019-09-10 02:10:26,451 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 116 transitions. Word has length 107 [2019-09-10 02:10:26,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:10:26,452 INFO L475 AbstractCegarLoop]: Abstraction has 116 states and 116 transitions. [2019-09-10 02:10:26,452 INFO L476 AbstractCegarLoop]: Interpolant automaton has 55 states. [2019-09-10 02:10:26,452 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 116 transitions. [2019-09-10 02:10:26,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2019-09-10 02:10:26,453 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:10:26,453 INFO L399 BasicCegarLoop]: trace histogram [52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:10:26,454 INFO L418 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:10:26,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:10:26,454 INFO L82 PathProgramCache]: Analyzing trace with hash -177348201, now seen corresponding path program 14 times [2019-09-10 02:10:26,454 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:10:26,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:10:26,455 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:10:26,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:10:26,455 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:10:26,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:10:27,975 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:10:27,975 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:10:27,975 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:10:27,975 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:10:27,975 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:10:27,975 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:10:27,975 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:10:27,987 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-10 02:10:27,987 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-10 02:10:28,063 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 53 check-sat command(s) [2019-09-10 02:10:28,063 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-10 02:10:28,066 INFO L256 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 55 conjunts are in the unsatisfiable core [2019-09-10 02:10:28,068 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:10:28,268 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:10:28,268 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:10:32,098 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:10:32,101 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:10:32,101 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 111 [2019-09-10 02:10:32,101 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:10:32,102 INFO L454 AbstractCegarLoop]: Interpolant automaton has 59 states [2019-09-10 02:10:32,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2019-09-10 02:10:32,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4310, Invalid=7900, Unknown=0, NotChecked=0, Total=12210 [2019-09-10 02:10:32,103 INFO L87 Difference]: Start difference. First operand 116 states and 116 transitions. Second operand 59 states. [2019-09-10 02:10:32,292 WARN L188 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 8 [2019-09-10 02:10:32,417 WARN L188 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 8 [2019-09-10 02:10:32,561 WARN L188 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 9 [2019-09-10 02:10:32,704 WARN L188 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-10 02:10:32,852 WARN L188 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-10 02:10:33,001 WARN L188 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-10 02:10:33,146 WARN L188 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-10 02:10:33,305 WARN L188 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-10 02:10:33,462 WARN L188 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-10 02:10:33,618 WARN L188 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-10 02:10:33,774 WARN L188 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2019-09-10 02:10:39,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:10:39,452 INFO L93 Difference]: Finished difference Result 124 states and 124 transitions. [2019-09-10 02:10:39,452 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2019-09-10 02:10:39,452 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 115 [2019-09-10 02:10:39,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:10:39,453 INFO L225 Difference]: With dead ends: 124 [2019-09-10 02:10:39,453 INFO L226 Difference]: Without dead ends: 124 [2019-09-10 02:10:39,454 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 174 SyntacticMatches, 2 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2008 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=10207, Invalid=17183, Unknown=0, NotChecked=0, Total=27390 [2019-09-10 02:10:39,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2019-09-10 02:10:39,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2019-09-10 02:10:39,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2019-09-10 02:10:39,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 124 transitions. [2019-09-10 02:10:39,458 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 124 transitions. Word has length 115 [2019-09-10 02:10:39,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:10:39,459 INFO L475 AbstractCegarLoop]: Abstraction has 124 states and 124 transitions. [2019-09-10 02:10:39,459 INFO L476 AbstractCegarLoop]: Interpolant automaton has 59 states. [2019-09-10 02:10:39,459 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 124 transitions. [2019-09-10 02:10:39,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2019-09-10 02:10:39,460 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:10:39,460 INFO L399 BasicCegarLoop]: trace histogram [56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:10:39,460 INFO L418 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:10:39,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:10:39,461 INFO L82 PathProgramCache]: Analyzing trace with hash -549626993, now seen corresponding path program 15 times [2019-09-10 02:10:39,461 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:10:39,462 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:10:39,462 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-10 02:10:39,462 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:10:39,462 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:10:39,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:10:41,245 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:10:41,245 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:10:41,245 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:10:41,245 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:10:41,245 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:10:41,245 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:10:41,245 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:10:41,255 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-10 02:10:41,256 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-10 02:10:41,447 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-10 02:10:41,447 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-10 02:10:41,570 INFO L256 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 59 conjunts are in the unsatisfiable core [2019-09-10 02:10:41,572 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:10:41,761 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:10:41,762 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:10:46,420 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:10:46,423 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:10:46,424 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 119 [2019-09-10 02:10:46,424 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:10:46,424 INFO L454 AbstractCegarLoop]: Interpolant automaton has 63 states [2019-09-10 02:10:46,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2019-09-10 02:10:46,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4976, Invalid=9066, Unknown=0, NotChecked=0, Total=14042 [2019-09-10 02:10:46,425 INFO L87 Difference]: Start difference. First operand 124 states and 124 transitions. Second operand 63 states. [2019-09-10 02:10:46,675 WARN L188 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 168 DAG size of output: 8 [2019-09-10 02:10:46,799 WARN L188 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 8 [2019-09-10 02:10:46,959 WARN L188 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 9 [2019-09-10 02:10:47,116 WARN L188 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-10 02:10:47,279 WARN L188 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-10 02:10:47,447 WARN L188 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-10 02:10:47,623 WARN L188 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-10 02:10:47,804 WARN L188 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-10 02:10:47,973 WARN L188 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-10 02:10:48,140 WARN L188 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-10 02:10:48,311 WARN L188 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-10 02:10:48,478 WARN L188 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-10 02:10:48,644 WARN L188 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-10 02:10:48,822 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-10 02:10:48,995 WARN L188 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2019-09-10 02:10:55,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:10:55,124 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2019-09-10 02:10:55,124 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2019-09-10 02:10:55,125 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 123 [2019-09-10 02:10:55,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:10:55,126 INFO L225 Difference]: With dead ends: 132 [2019-09-10 02:10:55,126 INFO L226 Difference]: Without dead ends: 132 [2019-09-10 02:10:55,127 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 186 SyntacticMatches, 2 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2274 ImplicationChecksByTransitivity, 14.5s TimeCoverageRelationStatistics Valid=11773, Invalid=19733, Unknown=0, NotChecked=0, Total=31506 [2019-09-10 02:10:55,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2019-09-10 02:10:55,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2019-09-10 02:10:55,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2019-09-10 02:10:55,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 132 transitions. [2019-09-10 02:10:55,131 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 132 transitions. Word has length 123 [2019-09-10 02:10:55,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:10:55,131 INFO L475 AbstractCegarLoop]: Abstraction has 132 states and 132 transitions. [2019-09-10 02:10:55,131 INFO L476 AbstractCegarLoop]: Interpolant automaton has 63 states. [2019-09-10 02:10:55,131 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 132 transitions. [2019-09-10 02:10:55,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2019-09-10 02:10:55,133 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:10:55,133 INFO L399 BasicCegarLoop]: trace histogram [60, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:10:55,133 INFO L418 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:10:55,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:10:55,133 INFO L82 PathProgramCache]: Analyzing trace with hash -2066784889, now seen corresponding path program 16 times [2019-09-10 02:10:55,133 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:10:55,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:10:55,134 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-10 02:10:55,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:10:55,134 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:10:55,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:10:57,364 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:10:57,365 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:10:57,365 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:10:57,365 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:10:57,365 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:10:57,365 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:10:57,365 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:10:57,375 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:10:57,375 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-10 02:10:57,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:10:57,703 INFO L256 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 63 conjunts are in the unsatisfiable core [2019-09-10 02:10:57,705 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:10:57,915 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:10:57,915 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:11:03,110 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:11:03,113 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:11:03,113 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 127 [2019-09-10 02:11:03,113 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:11:03,114 INFO L454 AbstractCegarLoop]: Interpolant automaton has 67 states [2019-09-10 02:11:03,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2019-09-10 02:11:03,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5690, Invalid=10312, Unknown=0, NotChecked=0, Total=16002 [2019-09-10 02:11:03,114 INFO L87 Difference]: Start difference. First operand 132 states and 132 transitions. Second operand 67 states. [2019-09-10 02:11:03,360 WARN L188 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 180 DAG size of output: 8 [2019-09-10 02:11:03,514 WARN L188 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 8 [2019-09-10 02:11:03,685 WARN L188 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 189 DAG size of output: 9 [2019-09-10 02:11:03,858 WARN L188 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-10 02:11:04,044 WARN L188 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-10 02:11:04,235 WARN L188 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-10 02:11:04,417 WARN L188 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-10 02:11:04,598 WARN L188 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-10 02:11:04,785 WARN L188 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-10 02:11:04,973 WARN L188 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-10 02:11:05,186 WARN L188 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-10 02:11:05,398 WARN L188 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-10 02:11:05,591 WARN L188 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-10 02:11:05,776 WARN L188 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-10 02:11:05,966 WARN L188 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-10 02:11:06,160 WARN L188 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-10 02:11:06,346 WARN L188 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-10 02:11:06,537 WARN L188 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-10 02:11:06,725 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2019-09-10 02:11:13,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:11:13,338 INFO L93 Difference]: Finished difference Result 140 states and 140 transitions. [2019-09-10 02:11:13,339 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2019-09-10 02:11:13,339 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 131 [2019-09-10 02:11:13,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:11:13,340 INFO L225 Difference]: With dead ends: 140 [2019-09-10 02:11:13,340 INFO L226 Difference]: Without dead ends: 140 [2019-09-10 02:11:13,341 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 198 SyntacticMatches, 2 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2556 ImplicationChecksByTransitivity, 16.9s TimeCoverageRelationStatistics Valid=13451, Invalid=22459, Unknown=0, NotChecked=0, Total=35910 [2019-09-10 02:11:13,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2019-09-10 02:11:13,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 140. [2019-09-10 02:11:13,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2019-09-10 02:11:13,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 140 transitions. [2019-09-10 02:11:13,344 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 140 transitions. Word has length 131 [2019-09-10 02:11:13,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:11:13,344 INFO L475 AbstractCegarLoop]: Abstraction has 140 states and 140 transitions. [2019-09-10 02:11:13,344 INFO L476 AbstractCegarLoop]: Interpolant automaton has 67 states. [2019-09-10 02:11:13,345 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 140 transitions. [2019-09-10 02:11:13,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2019-09-10 02:11:13,346 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:11:13,346 INFO L399 BasicCegarLoop]: trace histogram [64, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:11:13,346 INFO L418 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:11:13,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:11:13,346 INFO L82 PathProgramCache]: Analyzing trace with hash 1595664255, now seen corresponding path program 17 times [2019-09-10 02:11:13,347 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:11:13,347 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:11:13,347 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:11:13,347 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:11:13,348 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:11:13,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:11:15,695 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 0 proven. 4096 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:11:15,695 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:11:15,695 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:11:15,696 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:11:15,696 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:11:15,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:11:15,696 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:11:15,706 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-10 02:11:15,706 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-10 02:11:15,789 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 65 check-sat command(s) [2019-09-10 02:11:15,790 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-10 02:11:15,793 INFO L256 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 67 conjunts are in the unsatisfiable core [2019-09-10 02:11:15,795 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:11:16,094 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 0 proven. 4096 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:11:16,095 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:11:21,776 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 0 proven. 4096 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:11:21,780 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:11:21,780 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 135 [2019-09-10 02:11:21,781 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:11:21,781 INFO L454 AbstractCegarLoop]: Interpolant automaton has 71 states [2019-09-10 02:11:21,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2019-09-10 02:11:21,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6452, Invalid=11638, Unknown=0, NotChecked=0, Total=18090 [2019-09-10 02:11:21,782 INFO L87 Difference]: Start difference. First operand 140 states and 140 transitions. Second operand 71 states. [2019-09-10 02:11:22,032 WARN L188 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 8 [2019-09-10 02:11:22,202 WARN L188 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 8 [2019-09-10 02:11:22,393 WARN L188 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 9 [2019-09-10 02:11:22,580 WARN L188 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-10 02:11:22,781 WARN L188 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-10 02:11:22,986 WARN L188 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-10 02:11:23,183 WARN L188 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-10 02:11:23,386 WARN L188 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-10 02:11:23,592 WARN L188 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-10 02:11:23,800 WARN L188 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-10 02:11:24,002 WARN L188 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-10 02:11:24,208 WARN L188 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-10 02:11:24,416 WARN L188 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-10 02:11:24,623 WARN L188 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-10 02:11:24,831 WARN L188 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-10 02:11:25,043 WARN L188 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-10 02:11:25,242 WARN L188 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-10 02:11:25,451 WARN L188 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-10 02:11:25,673 WARN L188 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-10 02:11:25,876 WARN L188 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-10 02:11:26,085 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-10 02:11:26,294 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-10 02:11:26,501 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2019-09-10 02:11:33,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:11:33,550 INFO L93 Difference]: Finished difference Result 148 states and 148 transitions. [2019-09-10 02:11:33,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2019-09-10 02:11:33,550 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 139 [2019-09-10 02:11:33,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:11:33,551 INFO L225 Difference]: With dead ends: 148 [2019-09-10 02:11:33,552 INFO L226 Difference]: Without dead ends: 148 [2019-09-10 02:11:33,553 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 412 GetRequests, 210 SyntacticMatches, 2 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2854 ImplicationChecksByTransitivity, 19.1s TimeCoverageRelationStatistics Valid=15241, Invalid=25361, Unknown=0, NotChecked=0, Total=40602 [2019-09-10 02:11:33,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2019-09-10 02:11:33,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 148. [2019-09-10 02:11:33,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2019-09-10 02:11:33,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 148 transitions. [2019-09-10 02:11:33,557 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 148 transitions. Word has length 139 [2019-09-10 02:11:33,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:11:33,557 INFO L475 AbstractCegarLoop]: Abstraction has 148 states and 148 transitions. [2019-09-10 02:11:33,557 INFO L476 AbstractCegarLoop]: Interpolant automaton has 71 states. [2019-09-10 02:11:33,557 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 148 transitions. [2019-09-10 02:11:33,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2019-09-10 02:11:33,559 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:11:33,559 INFO L399 BasicCegarLoop]: trace histogram [68, 68, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:11:33,559 INFO L418 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:11:33,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:11:33,559 INFO L82 PathProgramCache]: Analyzing trace with hash 1864038775, now seen corresponding path program 18 times [2019-09-10 02:11:33,559 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:11:33,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:11:33,560 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-10 02:11:33,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:11:33,560 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:11:33,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:11:36,082 INFO L134 CoverageAnalysis]: Checked inductivity of 4624 backedges. 0 proven. 4624 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:11:36,082 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:11:36,082 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:11:36,083 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:11:36,083 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:11:36,083 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:11:36,083 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:11:36,092 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-10 02:11:36,092 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-10 02:11:36,208 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-10 02:11:36,208 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-10 02:11:36,235 INFO L256 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 71 conjunts are in the unsatisfiable core [2019-09-10 02:11:36,237 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:11:36,483 INFO L134 CoverageAnalysis]: Checked inductivity of 4624 backedges. 0 proven. 4624 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:11:36,484 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:11:42,836 INFO L134 CoverageAnalysis]: Checked inductivity of 4624 backedges. 0 proven. 4624 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:11:42,839 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:11:42,840 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 143 [2019-09-10 02:11:42,840 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:11:42,840 INFO L454 AbstractCegarLoop]: Interpolant automaton has 75 states [2019-09-10 02:11:42,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2019-09-10 02:11:42,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7262, Invalid=13044, Unknown=0, NotChecked=0, Total=20306 [2019-09-10 02:11:42,842 INFO L87 Difference]: Start difference. First operand 148 states and 148 transitions. Second operand 75 states. [2019-09-10 02:11:43,117 WARN L188 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 204 DAG size of output: 8 [2019-09-10 02:11:43,300 WARN L188 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 8 [2019-09-10 02:11:43,502 WARN L188 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 9 [2019-09-10 02:11:43,711 WARN L188 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-10 02:11:43,929 WARN L188 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-10 02:11:44,145 WARN L188 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-10 02:11:44,378 WARN L188 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-10 02:11:44,602 WARN L188 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-10 02:11:44,823 WARN L188 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-10 02:11:45,053 WARN L188 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-10 02:11:45,280 WARN L188 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-10 02:11:45,510 WARN L188 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-10 02:11:45,740 WARN L188 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-10 02:11:45,985 WARN L188 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-10 02:11:46,212 WARN L188 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-10 02:11:46,445 WARN L188 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-10 02:11:46,700 WARN L188 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-10 02:11:46,934 WARN L188 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-10 02:11:47,167 WARN L188 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-10 02:11:47,406 WARN L188 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-10 02:11:47,645 WARN L188 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-10 02:11:47,883 WARN L188 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-10 02:11:48,109 WARN L188 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-10 02:11:48,339 WARN L188 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-10 02:11:48,572 WARN L188 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-10 02:11:48,802 WARN L188 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-10 02:11:49,036 WARN L188 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2019-09-10 02:11:49,268 WARN L188 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2019-09-10 02:11:56,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:11:56,716 INFO L93 Difference]: Finished difference Result 156 states and 156 transitions. [2019-09-10 02:11:56,716 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2019-09-10 02:11:56,716 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 147 [2019-09-10 02:11:56,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:11:56,717 INFO L225 Difference]: With dead ends: 156 [2019-09-10 02:11:56,717 INFO L226 Difference]: Without dead ends: 156 [2019-09-10 02:11:56,719 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 436 GetRequests, 222 SyntacticMatches, 2 SemanticMatches, 212 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3168 ImplicationChecksByTransitivity, 22.0s TimeCoverageRelationStatistics Valid=17143, Invalid=28439, Unknown=0, NotChecked=0, Total=45582 [2019-09-10 02:11:56,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2019-09-10 02:11:56,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 156. [2019-09-10 02:11:56,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2019-09-10 02:11:56,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 156 transitions. [2019-09-10 02:11:56,723 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 156 transitions. Word has length 147 [2019-09-10 02:11:56,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:11:56,724 INFO L475 AbstractCegarLoop]: Abstraction has 156 states and 156 transitions. [2019-09-10 02:11:56,724 INFO L476 AbstractCegarLoop]: Interpolant automaton has 75 states. [2019-09-10 02:11:56,724 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 156 transitions. [2019-09-10 02:11:56,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2019-09-10 02:11:56,724 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:11:56,725 INFO L399 BasicCegarLoop]: trace histogram [72, 72, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:11:56,725 INFO L418 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:11:56,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:11:56,725 INFO L82 PathProgramCache]: Analyzing trace with hash 1036292975, now seen corresponding path program 19 times [2019-09-10 02:11:56,725 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:11:56,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:11:56,726 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-10 02:11:56,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:11:56,726 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:11:57,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:11:59,665 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 0 proven. 5184 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:11:59,666 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:11:59,666 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:11:59,666 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:11:59,666 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:11:59,666 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:11:59,666 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:11:59,676 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:11:59,676 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-10 02:12:00,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:12:00,223 INFO L256 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 75 conjunts are in the unsatisfiable core [2019-09-10 02:12:00,225 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:12:00,486 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 0 proven. 5184 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:12:00,486 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:12:07,610 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 0 proven. 5184 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:12:07,613 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:12:07,613 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 151 [2019-09-10 02:12:07,613 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:12:07,614 INFO L454 AbstractCegarLoop]: Interpolant automaton has 79 states [2019-09-10 02:12:07,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2019-09-10 02:12:07,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8120, Invalid=14530, Unknown=0, NotChecked=0, Total=22650 [2019-09-10 02:12:07,616 INFO L87 Difference]: Start difference. First operand 156 states and 156 transitions. Second operand 79 states. [2019-09-10 02:12:07,909 WARN L188 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 216 DAG size of output: 8 [2019-09-10 02:12:08,117 WARN L188 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 8 [2019-09-10 02:12:08,344 WARN L188 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 225 DAG size of output: 9 [2019-09-10 02:12:08,569 WARN L188 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-10 02:12:08,804 WARN L188 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-10 02:12:09,041 WARN L188 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-10 02:12:09,271 WARN L188 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-10 02:12:09,514 WARN L188 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-10 02:12:09,753 WARN L188 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-10 02:12:10,001 WARN L188 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-10 02:12:10,254 WARN L188 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-10 02:12:10,497 WARN L188 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-10 02:12:10,749 WARN L188 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-10 02:12:11,001 WARN L188 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-10 02:12:11,255 WARN L188 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-10 02:12:11,512 WARN L188 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-10 02:12:11,764 WARN L188 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-10 02:12:12,018 WARN L188 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-10 02:12:12,274 WARN L188 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-10 02:12:12,531 WARN L188 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-10 02:12:12,790 WARN L188 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-10 02:12:13,046 WARN L188 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-10 02:12:13,320 WARN L188 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-10 02:12:13,579 WARN L188 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-10 02:12:13,849 WARN L188 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-10 02:12:14,105 WARN L188 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-10 02:12:14,346 WARN L188 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-10 02:12:14,596 WARN L188 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-10 02:12:14,840 WARN L188 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-10 02:12:15,091 WARN L188 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-10 02:12:15,343 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2019-09-10 02:12:23,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:12:23,460 INFO L93 Difference]: Finished difference Result 164 states and 164 transitions. [2019-09-10 02:12:23,460 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2019-09-10 02:12:23,460 INFO L78 Accepts]: Start accepts. Automaton has 79 states. Word has length 155 [2019-09-10 02:12:23,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:12:23,462 INFO L225 Difference]: With dead ends: 164 [2019-09-10 02:12:23,462 INFO L226 Difference]: Without dead ends: 164 [2019-09-10 02:12:23,464 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 460 GetRequests, 234 SyntacticMatches, 2 SemanticMatches, 224 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3498 ImplicationChecksByTransitivity, 25.1s TimeCoverageRelationStatistics Valid=19157, Invalid=31693, Unknown=0, NotChecked=0, Total=50850 [2019-09-10 02:12:23,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2019-09-10 02:12:23,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 164. [2019-09-10 02:12:23,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2019-09-10 02:12:23,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 164 transitions. [2019-09-10 02:12:23,468 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 164 transitions. Word has length 155 [2019-09-10 02:12:23,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:12:23,468 INFO L475 AbstractCegarLoop]: Abstraction has 164 states and 164 transitions. [2019-09-10 02:12:23,468 INFO L476 AbstractCegarLoop]: Interpolant automaton has 79 states. [2019-09-10 02:12:23,468 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 164 transitions. [2019-09-10 02:12:23,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2019-09-10 02:12:23,469 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:12:23,469 INFO L399 BasicCegarLoop]: trace histogram [76, 76, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:12:23,469 INFO L418 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:12:23,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:12:23,470 INFO L82 PathProgramCache]: Analyzing trace with hash -602884761, now seen corresponding path program 20 times [2019-09-10 02:12:23,470 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:12:23,470 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:12:23,471 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:12:23,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:12:23,471 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:12:23,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:12:26,923 INFO L134 CoverageAnalysis]: Checked inductivity of 5776 backedges. 0 proven. 5776 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:12:26,924 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:12:26,924 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:12:26,924 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:12:26,924 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:12:26,924 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:12:26,924 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:12:26,953 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-10 02:12:26,953 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-10 02:12:27,065 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 77 check-sat command(s) [2019-09-10 02:12:27,066 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-10 02:12:27,070 INFO L256 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 79 conjunts are in the unsatisfiable core [2019-09-10 02:12:27,072 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:12:27,395 INFO L134 CoverageAnalysis]: Checked inductivity of 5776 backedges. 0 proven. 5776 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:12:27,395 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:12:35,226 INFO L134 CoverageAnalysis]: Checked inductivity of 5776 backedges. 0 proven. 5776 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:12:35,229 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:12:35,229 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80, 80] total 159 [2019-09-10 02:12:35,229 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:12:35,230 INFO L454 AbstractCegarLoop]: Interpolant automaton has 83 states [2019-09-10 02:12:35,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2019-09-10 02:12:35,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9026, Invalid=16096, Unknown=0, NotChecked=0, Total=25122 [2019-09-10 02:12:35,231 INFO L87 Difference]: Start difference. First operand 164 states and 164 transitions. Second operand 83 states. [2019-09-10 02:12:35,540 WARN L188 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 228 DAG size of output: 8 [2019-09-10 02:12:35,749 WARN L188 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 231 DAG size of output: 8 [2019-09-10 02:12:35,990 WARN L188 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 237 DAG size of output: 9 [2019-09-10 02:12:36,246 WARN L188 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-10 02:12:36,497 WARN L188 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-10 02:12:36,751 WARN L188 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-10 02:12:37,021 WARN L188 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-10 02:12:37,296 WARN L188 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-10 02:12:37,553 WARN L188 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-10 02:12:37,828 WARN L188 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-10 02:12:38,088 WARN L188 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-10 02:12:38,359 WARN L188 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-10 02:12:38,627 WARN L188 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-10 02:12:38,902 WARN L188 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-10 02:12:39,176 WARN L188 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-10 02:12:39,450 WARN L188 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-10 02:12:39,719 WARN L188 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-10 02:12:40,001 WARN L188 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-10 02:12:40,268 WARN L188 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-10 02:12:40,537 WARN L188 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-10 02:12:40,809 WARN L188 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-10 02:12:41,078 WARN L188 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-10 02:12:41,364 WARN L188 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-10 02:12:41,645 WARN L188 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-10 02:12:41,924 WARN L188 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-10 02:12:42,207 WARN L188 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-10 02:12:42,485 WARN L188 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-10 02:12:42,755 WARN L188 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-10 02:12:43,023 WARN L188 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-10 02:12:43,292 WARN L188 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-10 02:12:43,559 WARN L188 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-10 02:12:43,843 WARN L188 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-10 02:12:44,105 WARN L188 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-10 02:12:44,370 WARN L188 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-10 02:12:44,645 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2019-09-10 02:12:53,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:12:53,207 INFO L93 Difference]: Finished difference Result 172 states and 172 transitions. [2019-09-10 02:12:53,210 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2019-09-10 02:12:53,210 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 163 [2019-09-10 02:12:53,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:12:53,211 INFO L225 Difference]: With dead ends: 172 [2019-09-10 02:12:53,211 INFO L226 Difference]: Without dead ends: 172 [2019-09-10 02:12:53,213 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 246 SyntacticMatches, 2 SemanticMatches, 236 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3844 ImplicationChecksByTransitivity, 28.4s TimeCoverageRelationStatistics Valid=21283, Invalid=35123, Unknown=0, NotChecked=0, Total=56406 [2019-09-10 02:12:53,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2019-09-10 02:12:53,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 172. [2019-09-10 02:12:53,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2019-09-10 02:12:53,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 172 transitions. [2019-09-10 02:12:53,217 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 172 transitions. Word has length 163 [2019-09-10 02:12:53,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:12:53,218 INFO L475 AbstractCegarLoop]: Abstraction has 172 states and 172 transitions. [2019-09-10 02:12:53,218 INFO L476 AbstractCegarLoop]: Interpolant automaton has 83 states. [2019-09-10 02:12:53,218 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 172 transitions. [2019-09-10 02:12:53,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2019-09-10 02:12:53,220 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:12:53,220 INFO L399 BasicCegarLoop]: trace histogram [80, 80, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:12:53,220 INFO L418 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:12:53,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:12:53,221 INFO L82 PathProgramCache]: Analyzing trace with hash -487104673, now seen corresponding path program 21 times [2019-09-10 02:12:53,221 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:12:53,222 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:12:53,222 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-10 02:12:53,223 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:12:53,223 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:12:53,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:12:57,381 INFO L134 CoverageAnalysis]: Checked inductivity of 6400 backedges. 0 proven. 6400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:12:57,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:12:57,382 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:12:57,382 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:12:57,382 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:12:57,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:12:57,382 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:12:57,392 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-10 02:12:57,392 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-10 02:12:57,608 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-10 02:12:57,609 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-10 02:12:57,716 INFO L256 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 83 conjunts are in the unsatisfiable core [2019-09-10 02:12:57,719 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:12:58,093 INFO L134 CoverageAnalysis]: Checked inductivity of 6400 backedges. 0 proven. 6400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:12:58,093 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:13:06,741 INFO L134 CoverageAnalysis]: Checked inductivity of 6400 backedges. 0 proven. 6400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:13:06,744 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:13:06,745 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84, 84] total 167 [2019-09-10 02:13:06,745 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:13:06,745 INFO L454 AbstractCegarLoop]: Interpolant automaton has 87 states [2019-09-10 02:13:06,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2019-09-10 02:13:06,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9980, Invalid=17742, Unknown=0, NotChecked=0, Total=27722 [2019-09-10 02:13:06,747 INFO L87 Difference]: Start difference. First operand 172 states and 172 transitions. Second operand 87 states. [2019-09-10 02:13:07,084 WARN L188 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 240 DAG size of output: 8 [2019-09-10 02:13:07,321 WARN L188 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 243 DAG size of output: 8 [2019-09-10 02:13:07,596 WARN L188 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 249 DAG size of output: 9 [2019-09-10 02:13:07,867 WARN L188 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-10 02:13:08,142 WARN L188 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-10 02:13:08,420 WARN L188 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-10 02:13:08,705 WARN L188 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-10 02:13:08,992 WARN L188 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-10 02:13:09,272 WARN L188 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-10 02:13:09,564 WARN L188 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-10 02:13:09,862 WARN L188 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-10 02:13:10,141 WARN L188 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-10 02:13:10,436 WARN L188 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-10 02:13:10,732 WARN L188 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-10 02:13:11,024 WARN L188 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-10 02:13:11,326 WARN L188 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-10 02:13:11,625 WARN L188 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-10 02:13:11,921 WARN L188 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-10 02:13:12,213 WARN L188 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-10 02:13:12,527 WARN L188 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-10 02:13:12,845 WARN L188 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-10 02:13:13,148 WARN L188 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-10 02:13:13,460 WARN L188 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-10 02:13:13,767 WARN L188 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-10 02:13:14,077 WARN L188 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-10 02:13:14,383 WARN L188 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-10 02:13:14,688 WARN L188 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-10 02:13:15,002 WARN L188 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-10 02:13:15,303 WARN L188 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-10 02:13:15,592 WARN L188 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-10 02:13:15,892 WARN L188 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-10 02:13:16,183 WARN L188 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-10 02:13:16,476 WARN L188 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-10 02:13:16,774 WARN L188 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-10 02:13:17,053 WARN L188 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-10 02:13:17,333 WARN L188 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-10 02:13:17,613 WARN L188 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-10 02:13:17,891 WARN L188 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-10 02:13:27,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:13:27,285 INFO L93 Difference]: Finished difference Result 180 states and 180 transitions. [2019-09-10 02:13:27,286 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2019-09-10 02:13:27,286 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 171 [2019-09-10 02:13:27,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:13:27,287 INFO L225 Difference]: With dead ends: 180 [2019-09-10 02:13:27,287 INFO L226 Difference]: Without dead ends: 180 [2019-09-10 02:13:27,289 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 508 GetRequests, 258 SyntacticMatches, 2 SemanticMatches, 248 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4206 ImplicationChecksByTransitivity, 32.3s TimeCoverageRelationStatistics Valid=23521, Invalid=38729, Unknown=0, NotChecked=0, Total=62250 [2019-09-10 02:13:27,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2019-09-10 02:13:27,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 180. [2019-09-10 02:13:27,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2019-09-10 02:13:27,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 180 transitions. [2019-09-10 02:13:27,293 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 180 transitions. Word has length 171 [2019-09-10 02:13:27,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:13:27,293 INFO L475 AbstractCegarLoop]: Abstraction has 180 states and 180 transitions. [2019-09-10 02:13:27,293 INFO L476 AbstractCegarLoop]: Interpolant automaton has 87 states. [2019-09-10 02:13:27,294 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 180 transitions. [2019-09-10 02:13:27,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2019-09-10 02:13:27,294 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:13:27,295 INFO L399 BasicCegarLoop]: trace histogram [84, 84, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:13:27,295 INFO L418 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:13:27,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:13:27,295 INFO L82 PathProgramCache]: Analyzing trace with hash 1936757079, now seen corresponding path program 22 times [2019-09-10 02:13:27,295 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:13:27,296 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:13:27,296 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-10 02:13:27,296 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:13:27,296 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:13:27,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:13:31,370 INFO L134 CoverageAnalysis]: Checked inductivity of 7056 backedges. 0 proven. 7056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:13:31,371 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:13:31,371 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:13:31,371 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:13:31,371 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:13:31,371 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:13:31,371 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:13:31,382 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:13:31,382 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-10 02:13:31,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:13:32,269 INFO L256 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 87 conjunts are in the unsatisfiable core [2019-09-10 02:13:32,272 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:13:32,600 INFO L134 CoverageAnalysis]: Checked inductivity of 7056 backedges. 0 proven. 7056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:13:32,600 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:13:42,156 INFO L134 CoverageAnalysis]: Checked inductivity of 7056 backedges. 0 proven. 7056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:13:42,160 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:13:42,160 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88, 88] total 175 [2019-09-10 02:13:42,160 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:13:42,160 INFO L454 AbstractCegarLoop]: Interpolant automaton has 91 states [2019-09-10 02:13:42,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2019-09-10 02:13:42,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10982, Invalid=19468, Unknown=0, NotChecked=0, Total=30450 [2019-09-10 02:13:42,162 INFO L87 Difference]: Start difference. First operand 180 states and 180 transitions. Second operand 91 states. [2019-09-10 02:13:42,530 WARN L188 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 252 DAG size of output: 8 [2019-09-10 02:13:42,787 WARN L188 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 255 DAG size of output: 8 [2019-09-10 02:13:43,074 WARN L188 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 261 DAG size of output: 9 [2019-09-10 02:13:43,378 WARN L188 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-10 02:13:43,671 WARN L188 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-10 02:13:43,967 WARN L188 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-10 02:13:44,276 WARN L188 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-10 02:13:44,586 WARN L188 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-10 02:13:44,890 WARN L188 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-10 02:13:45,199 WARN L188 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-10 02:13:45,512 WARN L188 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-10 02:13:45,833 WARN L188 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-10 02:13:46,157 WARN L188 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-10 02:13:46,476 WARN L188 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-10 02:13:46,797 WARN L188 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-10 02:13:47,121 WARN L188 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-10 02:13:47,435 WARN L188 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-10 02:13:47,753 WARN L188 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-10 02:13:48,086 WARN L188 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-10 02:13:48,410 WARN L188 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-10 02:13:48,730 WARN L188 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-10 02:13:49,059 WARN L188 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-10 02:13:49,400 WARN L188 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-10 02:13:49,736 WARN L188 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-10 02:13:50,061 WARN L188 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-10 02:13:50,390 WARN L188 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-10 02:13:50,720 WARN L188 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-10 02:13:51,042 WARN L188 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-10 02:13:51,367 WARN L188 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-10 02:13:51,701 WARN L188 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-10 02:13:52,013 WARN L188 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-10 02:13:52,334 WARN L188 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-10 02:13:52,646 WARN L188 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-10 02:13:52,967 WARN L188 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-10 02:13:53,280 WARN L188 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-10 02:13:53,596 WARN L188 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-10 02:13:53,909 WARN L188 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-10 02:13:54,217 WARN L188 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-10 02:13:54,509 WARN L188 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-10 02:13:54,799 WARN L188 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-10 02:13:55,095 WARN L188 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-10 02:13:55,394 WARN L188 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-10 02:14:05,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:14:05,402 INFO L93 Difference]: Finished difference Result 188 states and 188 transitions. [2019-09-10 02:14:05,408 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2019-09-10 02:14:05,408 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 179 [2019-09-10 02:14:05,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:14:05,410 INFO L225 Difference]: With dead ends: 188 [2019-09-10 02:14:05,410 INFO L226 Difference]: Without dead ends: 188 [2019-09-10 02:14:05,412 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 532 GetRequests, 270 SyntacticMatches, 2 SemanticMatches, 260 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4584 ImplicationChecksByTransitivity, 35.8s TimeCoverageRelationStatistics Valid=25871, Invalid=42511, Unknown=0, NotChecked=0, Total=68382 [2019-09-10 02:14:05,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2019-09-10 02:14:05,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 188. [2019-09-10 02:14:05,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2019-09-10 02:14:05,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 188 transitions. [2019-09-10 02:14:05,416 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 188 transitions. Word has length 179 [2019-09-10 02:14:05,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:14:05,417 INFO L475 AbstractCegarLoop]: Abstraction has 188 states and 188 transitions. [2019-09-10 02:14:05,417 INFO L476 AbstractCegarLoop]: Interpolant automaton has 91 states. [2019-09-10 02:14:05,417 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 188 transitions. [2019-09-10 02:14:05,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2019-09-10 02:14:05,418 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:14:05,418 INFO L399 BasicCegarLoop]: trace histogram [88, 88, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:14:05,418 INFO L418 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:14:05,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:14:05,419 INFO L82 PathProgramCache]: Analyzing trace with hash 913591119, now seen corresponding path program 23 times [2019-09-10 02:14:05,419 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:14:05,419 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:14:05,419 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:14:05,420 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:14:05,420 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:14:05,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:14:09,515 INFO L134 CoverageAnalysis]: Checked inductivity of 7744 backedges. 0 proven. 7744 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:14:09,515 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:14:09,515 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:14:09,516 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:14:09,516 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:14:09,516 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:14:09,516 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:14:09,526 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-10 02:14:09,527 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-10 02:14:09,663 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 89 check-sat command(s) [2019-09-10 02:14:09,663 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-10 02:14:09,669 INFO L256 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 91 conjunts are in the unsatisfiable core [2019-09-10 02:14:09,673 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:14:10,007 INFO L134 CoverageAnalysis]: Checked inductivity of 7744 backedges. 0 proven. 7744 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:14:10,007 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:14:20,351 INFO L134 CoverageAnalysis]: Checked inductivity of 7744 backedges. 0 proven. 7744 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:14:20,356 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:14:20,356 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92, 92] total 183 [2019-09-10 02:14:20,357 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:14:20,357 INFO L454 AbstractCegarLoop]: Interpolant automaton has 95 states [2019-09-10 02:14:20,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2019-09-10 02:14:20,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12032, Invalid=21274, Unknown=0, NotChecked=0, Total=33306 [2019-09-10 02:14:20,359 INFO L87 Difference]: Start difference. First operand 188 states and 188 transitions. Second operand 95 states. [2019-09-10 02:14:20,749 WARN L188 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 264 DAG size of output: 8 [2019-09-10 02:14:21,038 WARN L188 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 267 DAG size of output: 8 [2019-09-10 02:14:21,341 WARN L188 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 273 DAG size of output: 9 [2019-09-10 02:14:21,647 WARN L188 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2019-09-10 02:14:21,959 WARN L188 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2019-09-10 02:14:22,286 WARN L188 SmtUtils]: Spent 278.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2019-09-10 02:14:22,618 WARN L188 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2019-09-10 02:14:22,956 WARN L188 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-10 02:14:23,284 WARN L188 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-10 02:14:23,623 WARN L188 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-10 02:14:23,959 WARN L188 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-10 02:14:24,306 WARN L188 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-10 02:14:24,643 WARN L188 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-10 02:14:24,983 WARN L188 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-10 02:14:25,328 WARN L188 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-10 02:14:25,669 WARN L188 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-10 02:14:26,019 WARN L188 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-10 02:14:26,355 WARN L188 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-10 02:14:26,698 WARN L188 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-10 02:14:27,049 WARN L188 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-10 02:14:27,393 WARN L188 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-10 02:14:27,751 WARN L188 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-10 02:14:28,094 WARN L188 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-10 02:14:28,440 WARN L188 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-10 02:14:28,794 WARN L188 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-10 02:14:29,145 WARN L188 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-10 02:14:29,497 WARN L188 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-10 02:14:29,853 WARN L188 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-10 02:14:30,199 WARN L188 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-10 02:14:30,544 WARN L188 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-10 02:14:30,889 WARN L188 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-10 02:14:31,251 WARN L188 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-10 02:14:31,592 WARN L188 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-10 02:14:32,074 WARN L188 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-10 02:14:32,418 WARN L188 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-10 02:14:32,759 WARN L188 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-10 02:14:33,103 WARN L188 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-10 02:14:33,431 WARN L188 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-10 02:14:33,755 WARN L188 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-10 02:14:34,090 WARN L188 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-10 02:14:34,422 WARN L188 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-10 02:14:34,755 WARN L188 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-10 02:14:35,066 WARN L188 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-10 02:14:35,385 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-10 02:14:35,710 WARN L188 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-10 02:14:36,030 WARN L188 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-10 02:14:36,676 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2019-09-10 02:14:46,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:14:46,681 INFO L93 Difference]: Finished difference Result 196 states and 196 transitions. [2019-09-10 02:14:46,681 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2019-09-10 02:14:46,681 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 187 [2019-09-10 02:14:46,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:14:46,682 INFO L225 Difference]: With dead ends: 196 [2019-09-10 02:14:46,682 INFO L226 Difference]: Without dead ends: 196 [2019-09-10 02:14:46,684 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 556 GetRequests, 282 SyntacticMatches, 2 SemanticMatches, 272 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4978 ImplicationChecksByTransitivity, 39.8s TimeCoverageRelationStatistics Valid=28333, Invalid=46469, Unknown=0, NotChecked=0, Total=74802 [2019-09-10 02:14:46,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2019-09-10 02:14:46,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2019-09-10 02:14:46,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2019-09-10 02:14:46,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 196 transitions. [2019-09-10 02:14:46,688 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 196 transitions. Word has length 187 [2019-09-10 02:14:46,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:14:46,688 INFO L475 AbstractCegarLoop]: Abstraction has 196 states and 196 transitions. [2019-09-10 02:14:46,688 INFO L476 AbstractCegarLoop]: Interpolant automaton has 95 states. [2019-09-10 02:14:46,688 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 196 transitions. [2019-09-10 02:14:46,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2019-09-10 02:14:46,689 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:14:46,689 INFO L399 BasicCegarLoop]: trace histogram [92, 92, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:14:46,689 INFO L418 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:14:46,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:14:46,690 INFO L82 PathProgramCache]: Analyzing trace with hash 1559924039, now seen corresponding path program 24 times [2019-09-10 02:14:46,690 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:14:46,690 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:14:46,690 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-10 02:14:46,690 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:14:46,690 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:14:47,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:14:51,495 INFO L134 CoverageAnalysis]: Checked inductivity of 8464 backedges. 0 proven. 8464 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:14:51,495 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:14:51,496 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:14:51,496 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:14:51,496 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:14:51,496 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:14:51,496 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:14:51,507 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-10 02:14:51,507 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-10 02:14:51,958 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-10 02:14:51,958 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-10 02:14:52,190 INFO L256 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 95 conjunts are in the unsatisfiable core [2019-09-10 02:14:52,194 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:14:52,826 INFO L134 CoverageAnalysis]: Checked inductivity of 8464 backedges. 0 proven. 8464 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:14:52,826 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:15:04,415 INFO L134 CoverageAnalysis]: Checked inductivity of 8464 backedges. 0 proven. 8464 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:15:04,419 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:15:04,419 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96, 96] total 191 [2019-09-10 02:15:04,419 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:15:04,420 INFO L454 AbstractCegarLoop]: Interpolant automaton has 99 states [2019-09-10 02:15:04,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2019-09-10 02:15:04,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13130, Invalid=23160, Unknown=0, NotChecked=0, Total=36290 [2019-09-10 02:15:04,421 INFO L87 Difference]: Start difference. First operand 196 states and 196 transitions. Second operand 99 states. [2019-09-10 02:15:04,852 WARN L188 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 276 DAG size of output: 8 [2019-09-10 02:15:05,148 WARN L188 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 279 DAG size of output: 8 [2019-09-10 02:15:05,480 WARN L188 SmtUtils]: Spent 307.00 ms on a formula simplification. DAG size of input: 285 DAG size of output: 9 [2019-09-10 02:15:05,810 WARN L188 SmtUtils]: Spent 295.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2019-09-10 02:15:06,156 WARN L188 SmtUtils]: Spent 299.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2019-09-10 02:15:06,498 WARN L188 SmtUtils]: Spent 291.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2019-09-10 02:15:06,862 WARN L188 SmtUtils]: Spent 284.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2019-09-10 02:15:07,211 WARN L188 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2019-09-10 02:15:07,559 WARN L188 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2019-09-10 02:15:07,916 WARN L188 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2019-09-10 02:15:08,277 WARN L188 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2019-09-10 02:15:08,657 WARN L188 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-10 02:15:09,021 WARN L188 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-10 02:15:09,387 WARN L188 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-10 02:15:09,747 WARN L188 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-10 02:15:10,115 WARN L188 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-10 02:15:10,477 WARN L188 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-10 02:15:10,842 WARN L188 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-10 02:15:11,221 WARN L188 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-10 02:15:11,601 WARN L188 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-10 02:15:11,972 WARN L188 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-10 02:15:12,343 WARN L188 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-10 02:15:12,717 WARN L188 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-10 02:15:13,084 WARN L188 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-10 02:15:13,470 WARN L188 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-10 02:15:13,859 WARN L188 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-10 02:15:14,220 WARN L188 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-10 02:15:14,582 WARN L188 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-10 02:15:14,949 WARN L188 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-10 02:15:15,323 WARN L188 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-10 02:15:15,686 WARN L188 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-10 02:15:16,052 WARN L188 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-10 02:15:16,441 WARN L188 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-10 02:15:16,809 WARN L188 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-10 02:15:17,177 WARN L188 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-10 02:15:17,536 WARN L188 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-10 02:15:17,906 WARN L188 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-10 02:15:18,274 WARN L188 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-10 02:15:18,636 WARN L188 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-10 02:15:18,997 WARN L188 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-10 02:15:19,359 WARN L188 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-10 02:15:19,736 WARN L188 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-10 02:15:20,086 WARN L188 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-10 02:15:20,441 WARN L188 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-10 02:15:20,797 WARN L188 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-10 02:15:21,160 WARN L188 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-10 02:15:21,505 WARN L188 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-10 02:15:21,838 WARN L188 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-10 02:15:22,170 WARN L188 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-10 02:15:22,513 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-10 02:15:22,843 WARN L188 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2019-09-10 02:15:23,179 WARN L188 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2019-09-10 02:15:33,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:15:33,455 INFO L93 Difference]: Finished difference Result 204 states and 204 transitions. [2019-09-10 02:15:33,456 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2019-09-10 02:15:33,456 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 195 [2019-09-10 02:15:33,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:15:33,457 INFO L225 Difference]: With dead ends: 204 [2019-09-10 02:15:33,457 INFO L226 Difference]: Without dead ends: 204 [2019-09-10 02:15:33,459 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 580 GetRequests, 294 SyntacticMatches, 2 SemanticMatches, 284 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5388 ImplicationChecksByTransitivity, 44.5s TimeCoverageRelationStatistics Valid=30907, Invalid=50603, Unknown=0, NotChecked=0, Total=81510 [2019-09-10 02:15:33,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2019-09-10 02:15:33,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 204. [2019-09-10 02:15:33,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2019-09-10 02:15:33,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 204 transitions. [2019-09-10 02:15:33,464 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 204 transitions. Word has length 195 [2019-09-10 02:15:33,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:15:33,464 INFO L475 AbstractCegarLoop]: Abstraction has 204 states and 204 transitions. [2019-09-10 02:15:33,464 INFO L476 AbstractCegarLoop]: Interpolant automaton has 99 states. [2019-09-10 02:15:33,464 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 204 transitions. [2019-09-10 02:15:33,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2019-09-10 02:15:33,466 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:15:33,466 INFO L399 BasicCegarLoop]: trace histogram [96, 96, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:15:33,466 INFO L418 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:15:33,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:15:33,466 INFO L82 PathProgramCache]: Analyzing trace with hash -1610918081, now seen corresponding path program 25 times [2019-09-10 02:15:33,466 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:15:33,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:15:33,467 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-10 02:15:33,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:15:33,468 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:15:34,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:15:38,439 INFO L134 CoverageAnalysis]: Checked inductivity of 9216 backedges. 0 proven. 9216 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:15:38,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:15:38,439 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:15:38,440 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:15:38,440 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:15:38,440 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:15:38,440 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:15:38,466 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:15:38,466 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-10 02:15:39,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:15:39,769 INFO L256 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 99 conjunts are in the unsatisfiable core [2019-09-10 02:15:39,772 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:15:40,110 INFO L134 CoverageAnalysis]: Checked inductivity of 9216 backedges. 0 proven. 9216 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:15:40,111 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:15:52,521 INFO L134 CoverageAnalysis]: Checked inductivity of 9216 backedges. 0 proven. 9216 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:15:52,524 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:15:52,525 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 100, 100] total 199 [2019-09-10 02:15:52,525 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:15:52,525 INFO L454 AbstractCegarLoop]: Interpolant automaton has 103 states [2019-09-10 02:15:52,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2019-09-10 02:15:52,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14276, Invalid=25126, Unknown=0, NotChecked=0, Total=39402 [2019-09-10 02:15:52,527 INFO L87 Difference]: Start difference. First operand 204 states and 204 transitions. Second operand 103 states. [2019-09-10 02:15:52,978 WARN L188 SmtUtils]: Spent 306.00 ms on a formula simplification. DAG size of input: 288 DAG size of output: 8 [2019-09-10 02:15:53,309 WARN L188 SmtUtils]: Spent 309.00 ms on a formula simplification. DAG size of input: 291 DAG size of output: 8 [2019-09-10 02:15:53,675 WARN L188 SmtUtils]: Spent 341.00 ms on a formula simplification. DAG size of input: 297 DAG size of output: 9 [2019-09-10 02:15:54,033 WARN L188 SmtUtils]: Spent 320.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2019-09-10 02:15:54,401 WARN L188 SmtUtils]: Spent 323.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2019-09-10 02:15:54,770 WARN L188 SmtUtils]: Spent 316.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2019-09-10 02:15:55,138 WARN L188 SmtUtils]: Spent 305.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2019-09-10 02:15:55,520 WARN L188 SmtUtils]: Spent 308.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2019-09-10 02:15:55,895 WARN L188 SmtUtils]: Spent 297.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2019-09-10 02:15:56,296 WARN L188 SmtUtils]: Spent 295.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2019-09-10 02:15:56,683 WARN L188 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2019-09-10 02:15:57,077 WARN L188 SmtUtils]: Spent 287.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2019-09-10 02:15:57,457 WARN L188 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2019-09-10 02:15:57,847 WARN L188 SmtUtils]: Spent 271.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2019-09-10 02:15:58,240 WARN L188 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2019-09-10 02:15:58,637 WARN L188 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-10 02:15:59,041 WARN L188 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-10 02:15:59,441 WARN L188 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-10 02:15:59,872 WARN L188 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-10 02:16:00,277 WARN L188 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-10 02:16:00,678 WARN L188 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-10 02:16:01,080 WARN L188 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-10 02:16:01,480 WARN L188 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-10 02:16:01,869 WARN L188 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-10 02:16:02,282 WARN L188 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-10 02:16:02,685 WARN L188 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-10 02:16:03,081 WARN L188 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-10 02:16:03,484 WARN L188 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-10 02:16:03,888 WARN L188 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-10 02:16:04,282 WARN L188 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-10 02:16:04,669 WARN L188 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-10 02:16:05,073 WARN L188 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-10 02:16:05,469 WARN L188 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-10 02:16:05,853 WARN L188 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-10 02:16:06,261 WARN L188 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-10 02:16:06,655 WARN L188 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-10 02:16:07,052 WARN L188 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-10 02:16:07,450 WARN L188 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-10 02:16:07,840 WARN L188 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-10 02:16:08,235 WARN L188 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-10 02:16:08,632 WARN L188 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-10 02:16:09,016 WARN L188 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-10 02:16:09,397 WARN L188 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-10 02:16:09,789 WARN L188 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-10 02:16:10,172 WARN L188 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-10 02:16:10,815 WARN L188 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-10 02:16:11,273 WARN L188 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-10 02:16:11,654 WARN L188 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-10 02:16:12,037 WARN L188 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-10 02:16:12,416 WARN L188 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-10 02:16:12,783 WARN L188 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-10 02:16:13,141 WARN L188 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-10 02:16:13,503 WARN L188 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-10 02:16:13,856 WARN L188 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-10 02:16:25,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:16:25,316 INFO L93 Difference]: Finished difference Result 212 states and 212 transitions. [2019-09-10 02:16:25,317 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2019-09-10 02:16:25,317 INFO L78 Accepts]: Start accepts. Automaton has 103 states. Word has length 203 [2019-09-10 02:16:25,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:16:25,319 INFO L225 Difference]: With dead ends: 212 [2019-09-10 02:16:25,319 INFO L226 Difference]: Without dead ends: 212 [2019-09-10 02:16:25,322 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 604 GetRequests, 306 SyntacticMatches, 2 SemanticMatches, 296 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5814 ImplicationChecksByTransitivity, 48.9s TimeCoverageRelationStatistics Valid=33593, Invalid=54913, Unknown=0, NotChecked=0, Total=88506 [2019-09-10 02:16:25,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2019-09-10 02:16:25,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 212. [2019-09-10 02:16:25,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 212 states. [2019-09-10 02:16:25,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 212 transitions. [2019-09-10 02:16:25,326 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 212 transitions. Word has length 203 [2019-09-10 02:16:25,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:16:25,327 INFO L475 AbstractCegarLoop]: Abstraction has 212 states and 212 transitions. [2019-09-10 02:16:25,327 INFO L476 AbstractCegarLoop]: Interpolant automaton has 103 states. [2019-09-10 02:16:25,327 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 212 transitions. [2019-09-10 02:16:25,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 212 [2019-09-10 02:16:25,328 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:16:25,328 INFO L399 BasicCegarLoop]: trace histogram [100, 100, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:16:25,328 INFO L418 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:16:25,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:16:25,329 INFO L82 PathProgramCache]: Analyzing trace with hash 1080994103, now seen corresponding path program 26 times [2019-09-10 02:16:25,329 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:16:25,329 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:16:25,330 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:16:25,330 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:16:25,330 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:16:26,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:16:31,056 INFO L134 CoverageAnalysis]: Checked inductivity of 10000 backedges. 0 proven. 10000 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:16:31,056 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:16:31,056 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:16:31,056 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:16:31,056 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:16:31,056 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:16:31,057 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:16:31,067 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-10 02:16:31,067 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-10 02:16:31,257 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 101 check-sat command(s) [2019-09-10 02:16:31,258 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-10 02:16:31,265 INFO L256 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 103 conjunts are in the unsatisfiable core [2019-09-10 02:16:31,268 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:16:31,622 INFO L134 CoverageAnalysis]: Checked inductivity of 10000 backedges. 0 proven. 10000 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:16:31,622 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:16:45,028 INFO L134 CoverageAnalysis]: Checked inductivity of 10000 backedges. 0 proven. 10000 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:16:45,031 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:16:45,032 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [104, 104, 104] total 207 [2019-09-10 02:16:45,032 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:16:45,032 INFO L454 AbstractCegarLoop]: Interpolant automaton has 107 states [2019-09-10 02:16:45,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2019-09-10 02:16:45,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15470, Invalid=27172, Unknown=0, NotChecked=0, Total=42642 [2019-09-10 02:16:45,035 INFO L87 Difference]: Start difference. First operand 212 states and 212 transitions. Second operand 107 states. [2019-09-10 02:16:45,545 WARN L188 SmtUtils]: Spent 341.00 ms on a formula simplification. DAG size of input: 300 DAG size of output: 8 [2019-09-10 02:16:45,897 WARN L188 SmtUtils]: Spent 330.00 ms on a formula simplification. DAG size of input: 303 DAG size of output: 8 [2019-09-10 02:16:46,268 WARN L188 SmtUtils]: Spent 346.00 ms on a formula simplification. DAG size of input: 309 DAG size of output: 9 [2019-09-10 02:16:46,641 WARN L188 SmtUtils]: Spent 335.00 ms on a formula simplification. DAG size of input: 308 DAG size of output: 11 [2019-09-10 02:16:47,027 WARN L188 SmtUtils]: Spent 345.00 ms on a formula simplification. DAG size of input: 305 DAG size of output: 11 [2019-09-10 02:16:47,416 WARN L188 SmtUtils]: Spent 334.00 ms on a formula simplification. DAG size of input: 302 DAG size of output: 11 [2019-09-10 02:16:47,799 WARN L188 SmtUtils]: Spent 323.00 ms on a formula simplification. DAG size of input: 299 DAG size of output: 11 [2019-09-10 02:16:48,202 WARN L188 SmtUtils]: Spent 328.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2019-09-10 02:16:48,618 WARN L188 SmtUtils]: Spent 334.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2019-09-10 02:16:49,020 WARN L188 SmtUtils]: Spent 315.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2019-09-10 02:16:49,435 WARN L188 SmtUtils]: Spent 315.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2019-09-10 02:16:49,852 WARN L188 SmtUtils]: Spent 302.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2019-09-10 02:16:50,254 WARN L188 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2019-09-10 02:16:50,673 WARN L188 SmtUtils]: Spent 297.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2019-09-10 02:16:51,098 WARN L188 SmtUtils]: Spent 289.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2019-09-10 02:16:51,525 WARN L188 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2019-09-10 02:16:51,956 WARN L188 SmtUtils]: Spent 289.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2019-09-10 02:16:52,385 WARN L188 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2019-09-10 02:16:52,814 WARN L188 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2019-09-10 02:16:53,240 WARN L188 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-10 02:16:53,675 WARN L188 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-10 02:16:54,103 WARN L188 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-10 02:16:54,526 WARN L188 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-10 02:16:54,955 WARN L188 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-10 02:16:55,397 WARN L188 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-10 02:16:55,833 WARN L188 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-10 02:16:56,268 WARN L188 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-10 02:16:56,707 WARN L188 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-10 02:16:57,130 WARN L188 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-10 02:16:57,552 WARN L188 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-10 02:16:57,971 WARN L188 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-10 02:16:58,398 WARN L188 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-10 02:16:58,823 WARN L188 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-10 02:16:59,257 WARN L188 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-10 02:16:59,675 WARN L188 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-10 02:17:00,115 WARN L188 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-10 02:17:00,540 WARN L188 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-10 02:17:00,976 WARN L188 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-10 02:17:01,396 WARN L188 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-10 02:17:01,811 WARN L188 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-10 02:17:02,243 WARN L188 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-10 02:17:02,660 WARN L188 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-10 02:17:03,068 WARN L188 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-10 02:17:03,471 WARN L188 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-10 02:17:03,885 WARN L188 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-10 02:17:04,307 WARN L188 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-10 02:17:04,738 WARN L188 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-10 02:17:05,175 WARN L188 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-10 02:17:05,606 WARN L188 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-10 02:17:06,027 WARN L188 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-10 02:17:06,450 WARN L188 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-10 02:17:06,889 WARN L188 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-10 02:17:07,303 WARN L188 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-10 02:17:07,694 WARN L188 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-10 02:17:08,083 WARN L188 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-10 02:17:08,498 WARN L188 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-10 02:17:08,886 WARN L188 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-10 02:17:09,628 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2019-09-10 02:17:21,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:17:21,245 INFO L93 Difference]: Finished difference Result 220 states and 220 transitions. [2019-09-10 02:17:21,246 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2019-09-10 02:17:21,246 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 211 [2019-09-10 02:17:21,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:17:21,248 INFO L225 Difference]: With dead ends: 220 [2019-09-10 02:17:21,248 INFO L226 Difference]: Without dead ends: 220 [2019-09-10 02:17:21,250 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 628 GetRequests, 318 SyntacticMatches, 2 SemanticMatches, 308 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6256 ImplicationChecksByTransitivity, 53.9s TimeCoverageRelationStatistics Valid=36391, Invalid=59399, Unknown=0, NotChecked=0, Total=95790 [2019-09-10 02:17:21,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2019-09-10 02:17:21,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 220. [2019-09-10 02:17:21,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2019-09-10 02:17:21,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 220 transitions. [2019-09-10 02:17:21,254 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 220 transitions. Word has length 211 [2019-09-10 02:17:21,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:17:21,255 INFO L475 AbstractCegarLoop]: Abstraction has 220 states and 220 transitions. [2019-09-10 02:17:21,255 INFO L476 AbstractCegarLoop]: Interpolant automaton has 107 states. [2019-09-10 02:17:21,255 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 220 transitions. [2019-09-10 02:17:21,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2019-09-10 02:17:21,256 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:17:21,257 INFO L399 BasicCegarLoop]: trace histogram [104, 104, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:17:21,257 INFO L418 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:17:21,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:17:21,257 INFO L82 PathProgramCache]: Analyzing trace with hash 122454831, now seen corresponding path program 27 times [2019-09-10 02:17:21,257 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:17:21,258 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:17:21,258 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-10 02:17:21,258 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:17:21,258 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:17:22,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:17:27,142 INFO L134 CoverageAnalysis]: Checked inductivity of 10816 backedges. 0 proven. 10816 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:17:27,142 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:17:27,142 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:17:27,142 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:17:27,142 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:17:27,142 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:17:27,142 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:17:27,154 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-10 02:17:27,154 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-10 02:17:28,248 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-10 02:17:28,249 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-10 02:17:29,076 INFO L256 TraceCheckSpWp]: Trace formula consists of 340 conjuncts, 107 conjunts are in the unsatisfiable core [2019-09-10 02:17:29,079 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:17:29,436 INFO L134 CoverageAnalysis]: Checked inductivity of 10816 backedges. 0 proven. 10816 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:17:29,437 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:17:43,677 INFO L134 CoverageAnalysis]: Checked inductivity of 10816 backedges. 0 proven. 10816 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:17:43,680 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:17:43,680 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [108, 108, 108] total 215 [2019-09-10 02:17:43,680 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:17:43,681 INFO L454 AbstractCegarLoop]: Interpolant automaton has 111 states [2019-09-10 02:17:43,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2019-09-10 02:17:43,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16712, Invalid=29298, Unknown=0, NotChecked=0, Total=46010 [2019-09-10 02:17:43,684 INFO L87 Difference]: Start difference. First operand 220 states and 220 transitions. Second operand 111 states. [2019-09-10 02:17:44,182 WARN L188 SmtUtils]: Spent 333.00 ms on a formula simplification. DAG size of input: 312 DAG size of output: 8 [2019-09-10 02:17:44,546 WARN L188 SmtUtils]: Spent 342.00 ms on a formula simplification. DAG size of input: 315 DAG size of output: 8 [2019-09-10 02:17:44,969 WARN L188 SmtUtils]: Spent 397.00 ms on a formula simplification. DAG size of input: 321 DAG size of output: 9 [2019-09-10 02:17:45,370 WARN L188 SmtUtils]: Spent 363.00 ms on a formula simplification. DAG size of input: 320 DAG size of output: 11 [2019-09-10 02:17:45,784 WARN L188 SmtUtils]: Spent 365.00 ms on a formula simplification. DAG size of input: 317 DAG size of output: 11 [2019-09-10 02:17:46,192 WARN L188 SmtUtils]: Spent 353.00 ms on a formula simplification. DAG size of input: 314 DAG size of output: 11 [2019-09-10 02:17:46,607 WARN L188 SmtUtils]: Spent 348.00 ms on a formula simplification. DAG size of input: 311 DAG size of output: 11 [2019-09-10 02:17:47,035 WARN L188 SmtUtils]: Spent 354.00 ms on a formula simplification. DAG size of input: 308 DAG size of output: 11 [2019-09-10 02:17:47,452 WARN L188 SmtUtils]: Spent 335.00 ms on a formula simplification. DAG size of input: 305 DAG size of output: 11 [2019-09-10 02:17:47,879 WARN L188 SmtUtils]: Spent 332.00 ms on a formula simplification. DAG size of input: 302 DAG size of output: 11 [2019-09-10 02:17:48,322 WARN L188 SmtUtils]: Spent 326.00 ms on a formula simplification. DAG size of input: 299 DAG size of output: 11 [2019-09-10 02:17:48,792 WARN L188 SmtUtils]: Spent 342.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2019-09-10 02:17:49,236 WARN L188 SmtUtils]: Spent 314.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2019-09-10 02:17:49,674 WARN L188 SmtUtils]: Spent 311.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2019-09-10 02:17:50,120 WARN L188 SmtUtils]: Spent 306.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2019-09-10 02:17:50,577 WARN L188 SmtUtils]: Spent 311.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2019-09-10 02:17:51,025 WARN L188 SmtUtils]: Spent 295.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2019-09-10 02:17:51,474 WARN L188 SmtUtils]: Spent 295.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2019-09-10 02:17:51,926 WARN L188 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2019-09-10 02:17:52,392 WARN L188 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2019-09-10 02:17:52,856 WARN L188 SmtUtils]: Spent 281.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2019-09-10 02:17:53,315 WARN L188 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2019-09-10 02:17:53,802 WARN L188 SmtUtils]: Spent 289.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2019-09-10 02:17:54,278 WARN L188 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-10 02:17:54,738 WARN L188 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-10 02:17:55,197 WARN L188 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-10 02:17:55,659 WARN L188 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-10 02:17:56,130 WARN L188 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-10 02:17:56,585 WARN L188 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-10 02:17:57,039 WARN L188 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-10 02:17:57,496 WARN L188 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-10 02:17:57,961 WARN L188 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-10 02:17:58,405 WARN L188 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-10 02:17:58,878 WARN L188 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-10 02:17:59,344 WARN L188 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-10 02:17:59,792 WARN L188 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-10 02:18:00,236 WARN L188 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-10 02:18:00,701 WARN L188 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-10 02:18:01,146 WARN L188 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-10 02:18:01,593 WARN L188 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-10 02:18:02,032 WARN L188 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-10 02:18:02,501 WARN L188 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-10 02:18:02,938 WARN L188 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-10 02:18:03,382 WARN L188 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-10 02:18:03,831 WARN L188 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-10 02:18:04,361 WARN L188 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-10 02:18:04,818 WARN L188 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-10 02:18:05,296 WARN L188 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-10 02:18:05,774 WARN L188 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-10 02:18:06,240 WARN L188 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-10 02:18:06,680 WARN L188 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-10 02:18:07,133 WARN L188 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-10 02:18:07,574 WARN L188 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-10 02:18:08,026 WARN L188 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-10 02:18:08,492 WARN L188 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-10 02:18:08,911 WARN L188 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-10 02:18:09,349 WARN L188 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-10 02:18:09,770 WARN L188 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-10 02:18:10,216 WARN L188 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-10 02:18:10,651 WARN L188 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-10 02:18:11,066 WARN L188 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-10 02:18:11,449 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-10 02:18:24,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:18:24,063 INFO L93 Difference]: Finished difference Result 228 states and 228 transitions. [2019-09-10 02:18:24,063 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2019-09-10 02:18:24,063 INFO L78 Accepts]: Start accepts. Automaton has 111 states. Word has length 219 [2019-09-10 02:18:24,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:18:24,065 INFO L225 Difference]: With dead ends: 228 [2019-09-10 02:18:24,065 INFO L226 Difference]: Without dead ends: 228 [2019-09-10 02:18:24,069 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 652 GetRequests, 330 SyntacticMatches, 2 SemanticMatches, 320 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6714 ImplicationChecksByTransitivity, 58.9s TimeCoverageRelationStatistics Valid=39301, Invalid=64061, Unknown=0, NotChecked=0, Total=103362 [2019-09-10 02:18:24,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2019-09-10 02:18:24,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 228. [2019-09-10 02:18:24,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 228 states. [2019-09-10 02:18:24,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 228 transitions. [2019-09-10 02:18:24,073 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 228 transitions. Word has length 219 [2019-09-10 02:18:24,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:18:24,074 INFO L475 AbstractCegarLoop]: Abstraction has 228 states and 228 transitions. [2019-09-10 02:18:24,074 INFO L476 AbstractCegarLoop]: Interpolant automaton has 111 states. [2019-09-10 02:18:24,074 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 228 transitions. [2019-09-10 02:18:24,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2019-09-10 02:18:24,075 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:18:24,075 INFO L399 BasicCegarLoop]: trace histogram [108, 108, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:18:24,075 INFO L418 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:18:24,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:18:24,076 INFO L82 PathProgramCache]: Analyzing trace with hash 1166861607, now seen corresponding path program 28 times [2019-09-10 02:18:24,076 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:18:24,076 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:18:24,077 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-10 02:18:24,077 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:18:24,077 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:18:24,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:18:30,375 INFO L134 CoverageAnalysis]: Checked inductivity of 11664 backedges. 0 proven. 11664 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:18:30,376 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:18:30,376 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:18:30,376 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:18:30,376 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:18:30,376 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:18:30,376 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:18:30,386 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:18:30,386 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-10 02:18:31,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:18:32,161 INFO L256 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 111 conjunts are in the unsatisfiable core [2019-09-10 02:18:32,164 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:18:32,560 INFO L134 CoverageAnalysis]: Checked inductivity of 11664 backedges. 0 proven. 11664 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:18:32,561 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:18:48,016 INFO L134 CoverageAnalysis]: Checked inductivity of 11664 backedges. 0 proven. 11664 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:18:48,020 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:18:48,020 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [112, 112, 112] total 223 [2019-09-10 02:18:48,020 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:18:48,021 INFO L454 AbstractCegarLoop]: Interpolant automaton has 115 states [2019-09-10 02:18:48,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2019-09-10 02:18:48,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18002, Invalid=31504, Unknown=0, NotChecked=0, Total=49506 [2019-09-10 02:18:48,022 INFO L87 Difference]: Start difference. First operand 228 states and 228 transitions. Second operand 115 states. [2019-09-10 02:18:48,553 WARN L188 SmtUtils]: Spent 369.00 ms on a formula simplification. DAG size of input: 324 DAG size of output: 8 [2019-09-10 02:18:48,945 WARN L188 SmtUtils]: Spent 370.00 ms on a formula simplification. DAG size of input: 327 DAG size of output: 8 [2019-09-10 02:18:49,369 WARN L188 SmtUtils]: Spent 396.00 ms on a formula simplification. DAG size of input: 333 DAG size of output: 9 [2019-09-10 02:18:49,797 WARN L188 SmtUtils]: Spent 381.00 ms on a formula simplification. DAG size of input: 332 DAG size of output: 11 [2019-09-10 02:18:50,229 WARN L188 SmtUtils]: Spent 385.00 ms on a formula simplification. DAG size of input: 329 DAG size of output: 11 [2019-09-10 02:18:50,677 WARN L188 SmtUtils]: Spent 391.00 ms on a formula simplification. DAG size of input: 326 DAG size of output: 11 [2019-09-10 02:18:51,139 WARN L188 SmtUtils]: Spent 372.00 ms on a formula simplification. DAG size of input: 323 DAG size of output: 11 [2019-09-10 02:18:51,605 WARN L188 SmtUtils]: Spent 391.00 ms on a formula simplification. DAG size of input: 320 DAG size of output: 11 [2019-09-10 02:18:52,058 WARN L188 SmtUtils]: Spent 365.00 ms on a formula simplification. DAG size of input: 317 DAG size of output: 11 [2019-09-10 02:18:52,501 WARN L188 SmtUtils]: Spent 353.00 ms on a formula simplification. DAG size of input: 314 DAG size of output: 11 [2019-09-10 02:18:52,959 WARN L188 SmtUtils]: Spent 350.00 ms on a formula simplification. DAG size of input: 311 DAG size of output: 11 [2019-09-10 02:18:53,419 WARN L188 SmtUtils]: Spent 346.00 ms on a formula simplification. DAG size of input: 308 DAG size of output: 11 [2019-09-10 02:18:53,878 WARN L188 SmtUtils]: Spent 342.00 ms on a formula simplification. DAG size of input: 305 DAG size of output: 11 [2019-09-10 02:18:54,345 WARN L188 SmtUtils]: Spent 336.00 ms on a formula simplification. DAG size of input: 302 DAG size of output: 11 [2019-09-10 02:18:54,804 WARN L188 SmtUtils]: Spent 324.00 ms on a formula simplification. DAG size of input: 299 DAG size of output: 11 [2019-09-10 02:18:55,276 WARN L188 SmtUtils]: Spent 328.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2019-09-10 02:18:55,769 WARN L188 SmtUtils]: Spent 315.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2019-09-10 02:18:56,269 WARN L188 SmtUtils]: Spent 336.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2019-09-10 02:18:56,749 WARN L188 SmtUtils]: Spent 303.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2019-09-10 02:18:57,239 WARN L188 SmtUtils]: Spent 299.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2019-09-10 02:18:57,726 WARN L188 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2019-09-10 02:18:58,211 WARN L188 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2019-09-10 02:18:58,699 WARN L188 SmtUtils]: Spent 289.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2019-09-10 02:18:59,184 WARN L188 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2019-09-10 02:18:59,673 WARN L188 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2019-09-10 02:19:00,172 WARN L188 SmtUtils]: Spent 271.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2019-09-10 02:19:00,694 WARN L188 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2019-09-10 02:19:01,184 WARN L188 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-10 02:19:01,678 WARN L188 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-10 02:19:02,181 WARN L188 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-10 02:19:02,698 WARN L188 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-10 02:19:03,190 WARN L188 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-10 02:19:03,678 WARN L188 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-10 02:19:04,166 WARN L188 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-10 02:19:04,649 WARN L188 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-10 02:19:05,127 WARN L188 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-10 02:19:05,599 WARN L188 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-10 02:19:06,069 WARN L188 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-10 02:19:06,573 WARN L188 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-10 02:19:07,035 WARN L188 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-10 02:19:07,512 WARN L188 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-10 02:19:07,973 WARN L188 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-10 02:19:08,450 WARN L188 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-10 02:19:08,919 WARN L188 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-10 02:19:09,422 WARN L188 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-10 02:19:09,900 WARN L188 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-10 02:19:10,389 WARN L188 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-10 02:19:10,860 WARN L188 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-10 02:19:11,338 WARN L188 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-10 02:19:11,812 WARN L188 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-10 02:19:12,275 WARN L188 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-10 02:19:12,751 WARN L188 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-10 02:19:13,226 WARN L188 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-10 02:19:13,689 WARN L188 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-10 02:19:14,150 WARN L188 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-10 02:19:14,615 WARN L188 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-10 02:19:15,090 WARN L188 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-10 02:19:15,528 WARN L188 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-10 02:19:16,001 WARN L188 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-10 02:19:16,445 WARN L188 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-10 02:19:16,886 WARN L188 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-10 02:19:17,330 WARN L188 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-10 02:19:17,804 WARN L188 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-10 02:19:18,224 WARN L188 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-10 02:19:18,674 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-10 02:19:19,106 WARN L188 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-10 02:19:34,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:19:34,291 INFO L93 Difference]: Finished difference Result 236 states and 236 transitions. [2019-09-10 02:19:34,291 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2019-09-10 02:19:34,292 INFO L78 Accepts]: Start accepts. Automaton has 115 states. Word has length 227 [2019-09-10 02:19:34,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:19:34,296 INFO L225 Difference]: With dead ends: 236 [2019-09-10 02:19:34,296 INFO L226 Difference]: Without dead ends: 236 [2019-09-10 02:19:34,301 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 676 GetRequests, 342 SyntacticMatches, 2 SemanticMatches, 332 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7188 ImplicationChecksByTransitivity, 66.4s TimeCoverageRelationStatistics Valid=42323, Invalid=68898, Unknown=1, NotChecked=0, Total=111222 [2019-09-10 02:19:34,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2019-09-10 02:19:34,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 236. [2019-09-10 02:19:34,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 236 states. [2019-09-10 02:19:34,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 236 transitions. [2019-09-10 02:19:34,305 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 236 transitions. Word has length 227 [2019-09-10 02:19:34,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:19:34,306 INFO L475 AbstractCegarLoop]: Abstraction has 236 states and 236 transitions. [2019-09-10 02:19:34,306 INFO L476 AbstractCegarLoop]: Interpolant automaton has 115 states. [2019-09-10 02:19:34,306 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 236 transitions. [2019-09-10 02:19:34,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 236 [2019-09-10 02:19:34,307 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:19:34,308 INFO L399 BasicCegarLoop]: trace histogram [112, 112, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:19:34,308 INFO L418 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:19:34,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:19:34,308 INFO L82 PathProgramCache]: Analyzing trace with hash -735588577, now seen corresponding path program 29 times [2019-09-10 02:19:34,308 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:19:34,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:19:34,309 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:19:34,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:19:34,310 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:19:35,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:19:41,078 INFO L134 CoverageAnalysis]: Checked inductivity of 12544 backedges. 0 proven. 12544 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:19:41,079 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:19:41,079 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:19:41,079 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:19:41,079 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:19:41,079 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:19:41,079 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:19:41,089 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-10 02:19:41,089 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-10 02:19:41,274 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 113 check-sat command(s) [2019-09-10 02:19:41,275 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-10 02:19:41,281 INFO L256 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 115 conjunts are in the unsatisfiable core [2019-09-10 02:19:41,284 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:19:41,704 INFO L134 CoverageAnalysis]: Checked inductivity of 12544 backedges. 0 proven. 12544 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:19:41,705 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:19:58,254 INFO L134 CoverageAnalysis]: Checked inductivity of 12544 backedges. 0 proven. 12544 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:19:58,257 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:19:58,257 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [116, 116, 116] total 231 [2019-09-10 02:19:58,257 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:19:58,258 INFO L454 AbstractCegarLoop]: Interpolant automaton has 119 states [2019-09-10 02:19:58,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2019-09-10 02:19:58,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19340, Invalid=33790, Unknown=0, NotChecked=0, Total=53130 [2019-09-10 02:19:58,260 INFO L87 Difference]: Start difference. First operand 236 states and 236 transitions. Second operand 119 states. [2019-09-10 02:19:58,810 WARN L188 SmtUtils]: Spent 389.00 ms on a formula simplification. DAG size of input: 336 DAG size of output: 8 [2019-09-10 02:19:59,225 WARN L188 SmtUtils]: Spent 392.00 ms on a formula simplification. DAG size of input: 339 DAG size of output: 8 [2019-09-10 02:19:59,681 WARN L188 SmtUtils]: Spent 428.00 ms on a formula simplification. DAG size of input: 345 DAG size of output: 9 [2019-09-10 02:20:00,140 WARN L188 SmtUtils]: Spent 421.00 ms on a formula simplification. DAG size of input: 344 DAG size of output: 11 [2019-09-10 02:20:00,605 WARN L188 SmtUtils]: Spent 416.00 ms on a formula simplification. DAG size of input: 341 DAG size of output: 11 [2019-09-10 02:20:01,066 WARN L188 SmtUtils]: Spent 403.00 ms on a formula simplification. DAG size of input: 338 DAG size of output: 11 [2019-09-10 02:20:01,526 WARN L188 SmtUtils]: Spent 392.00 ms on a formula simplification. DAG size of input: 335 DAG size of output: 11 [2019-09-10 02:20:02,013 WARN L188 SmtUtils]: Spent 406.00 ms on a formula simplification. DAG size of input: 332 DAG size of output: 11 [2019-09-10 02:20:02,496 WARN L188 SmtUtils]: Spent 389.00 ms on a formula simplification. DAG size of input: 329 DAG size of output: 11 [2019-09-10 02:20:02,999 WARN L188 SmtUtils]: Spent 403.00 ms on a formula simplification. DAG size of input: 326 DAG size of output: 11 [2019-09-10 02:20:03,487 WARN L188 SmtUtils]: Spent 373.00 ms on a formula simplification. DAG size of input: 323 DAG size of output: 11 [2019-09-10 02:20:03,975 WARN L188 SmtUtils]: Spent 379.00 ms on a formula simplification. DAG size of input: 320 DAG size of output: 11 [2019-09-10 02:20:04,472 WARN L188 SmtUtils]: Spent 366.00 ms on a formula simplification. DAG size of input: 317 DAG size of output: 11 [2019-09-10 02:20:04,960 WARN L188 SmtUtils]: Spent 354.00 ms on a formula simplification. DAG size of input: 314 DAG size of output: 11 [2019-09-10 02:20:05,461 WARN L188 SmtUtils]: Spent 352.00 ms on a formula simplification. DAG size of input: 311 DAG size of output: 11 [2019-09-10 02:20:05,961 WARN L188 SmtUtils]: Spent 354.00 ms on a formula simplification. DAG size of input: 308 DAG size of output: 11 [2019-09-10 02:20:06,478 WARN L188 SmtUtils]: Spent 341.00 ms on a formula simplification. DAG size of input: 305 DAG size of output: 11 [2019-09-10 02:20:06,993 WARN L188 SmtUtils]: Spent 336.00 ms on a formula simplification. DAG size of input: 302 DAG size of output: 11 [2019-09-10 02:20:07,514 WARN L188 SmtUtils]: Spent 332.00 ms on a formula simplification. DAG size of input: 299 DAG size of output: 11 [2019-09-10 02:20:08,040 WARN L188 SmtUtils]: Spent 331.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2019-09-10 02:20:08,555 WARN L188 SmtUtils]: Spent 319.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2019-09-10 02:20:09,097 WARN L188 SmtUtils]: Spent 343.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2019-09-10 02:20:09,619 WARN L188 SmtUtils]: Spent 311.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2019-09-10 02:20:10,145 WARN L188 SmtUtils]: Spent 304.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2019-09-10 02:20:10,664 WARN L188 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2019-09-10 02:20:11,181 WARN L188 SmtUtils]: Spent 288.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2019-09-10 02:20:11,699 WARN L188 SmtUtils]: Spent 284.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2019-09-10 02:20:12,226 WARN L188 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2019-09-10 02:20:12,739 WARN L188 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2019-09-10 02:20:13,264 WARN L188 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2019-09-10 02:20:13,792 WARN L188 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2019-09-10 02:20:14,329 WARN L188 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-10 02:20:14,859 WARN L188 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-10 02:20:15,393 WARN L188 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-10 02:20:15,944 WARN L188 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-10 02:20:16,497 WARN L188 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-10 02:20:17,026 WARN L188 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-10 02:20:17,553 WARN L188 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-10 02:20:18,074 WARN L188 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-10 02:20:18,619 WARN L188 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-10 02:20:19,149 WARN L188 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-10 02:20:19,668 WARN L188 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-10 02:20:20,175 WARN L188 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-10 02:20:20,675 WARN L188 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-10 02:20:21,190 WARN L188 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-10 02:20:21,710 WARN L188 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-10 02:20:22,240 WARN L188 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-10 02:20:22,756 WARN L188 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-10 02:20:23,253 WARN L188 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-10 02:20:23,761 WARN L188 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-10 02:20:24,261 WARN L188 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-10 02:20:24,795 WARN L188 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-10 02:20:25,298 WARN L188 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-10 02:20:25,797 WARN L188 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-10 02:20:26,286 WARN L188 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-10 02:20:26,783 WARN L188 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-10 02:20:27,266 WARN L188 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-10 02:20:27,772 WARN L188 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-10 02:20:28,269 WARN L188 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-10 02:20:28,753 WARN L188 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-10 02:20:29,237 WARN L188 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-10 02:20:29,715 WARN L188 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-10 02:20:30,211 WARN L188 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-10 02:20:30,707 WARN L188 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-10 02:20:31,196 WARN L188 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-10 02:20:31,673 WARN L188 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-10 02:20:32,129 WARN L188 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-10 02:20:32,579 WARN L188 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-10 02:20:33,024 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-10 02:20:33,455 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-10 02:20:34,310 WARN L188 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2019-09-10 02:20:34,739 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 11 [2019-09-10 02:20:35,185 WARN L188 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 11 [2019-09-10 02:20:47,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:20:47,010 INFO L93 Difference]: Finished difference Result 244 states and 244 transitions. [2019-09-10 02:20:47,012 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2019-09-10 02:20:47,012 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 235 [2019-09-10 02:20:47,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:20:47,013 INFO L225 Difference]: With dead ends: 244 [2019-09-10 02:20:47,013 INFO L226 Difference]: Without dead ends: 244 [2019-09-10 02:20:47,015 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 700 GetRequests, 354 SyntacticMatches, 2 SemanticMatches, 344 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7678 ImplicationChecksByTransitivity, 70.3s TimeCoverageRelationStatistics Valid=45457, Invalid=73913, Unknown=0, NotChecked=0, Total=119370 [2019-09-10 02:20:47,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2019-09-10 02:20:47,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 244. [2019-09-10 02:20:47,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2019-09-10 02:20:47,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 244 transitions. [2019-09-10 02:20:47,019 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 244 transitions. Word has length 235 [2019-09-10 02:20:47,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:20:47,019 INFO L475 AbstractCegarLoop]: Abstraction has 244 states and 244 transitions. [2019-09-10 02:20:47,019 INFO L476 AbstractCegarLoop]: Interpolant automaton has 119 states. [2019-09-10 02:20:47,020 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 244 transitions. [2019-09-10 02:20:47,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2019-09-10 02:20:47,021 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:20:47,021 INFO L399 BasicCegarLoop]: trace histogram [116, 116, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:20:47,022 INFO L418 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:20:47,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:20:47,022 INFO L82 PathProgramCache]: Analyzing trace with hash 336937239, now seen corresponding path program 30 times [2019-09-10 02:20:47,022 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:20:47,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:20:47,023 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-10 02:20:47,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:20:47,023 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:20:48,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:20:54,502 INFO L134 CoverageAnalysis]: Checked inductivity of 13456 backedges. 0 proven. 13456 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:20:54,502 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:20:54,502 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:20:54,502 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:20:54,502 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:20:54,502 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:20:54,502 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:20:54,513 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-10 02:20:54,513 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-10 02:20:55,973 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-10 02:20:55,973 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-10 02:20:57,045 INFO L256 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 119 conjunts are in the unsatisfiable core [2019-09-10 02:20:57,048 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:20:57,476 INFO L134 CoverageAnalysis]: Checked inductivity of 13456 backedges. 0 proven. 13456 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:20:57,477 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-10 02:21:15,245 INFO L134 CoverageAnalysis]: Checked inductivity of 13456 backedges. 0 proven. 13456 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:21:15,248 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-10 02:21:15,249 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [120, 120, 120] total 239 [2019-09-10 02:21:15,249 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-10 02:21:15,249 INFO L454 AbstractCegarLoop]: Interpolant automaton has 123 states [2019-09-10 02:21:15,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2019-09-10 02:21:15,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20726, Invalid=36156, Unknown=0, NotChecked=0, Total=56882 [2019-09-10 02:21:15,251 INFO L87 Difference]: Start difference. First operand 244 states and 244 transitions. Second operand 123 states. [2019-09-10 02:21:15,843 WARN L188 SmtUtils]: Spent 410.00 ms on a formula simplification. DAG size of input: 348 DAG size of output: 8 [2019-09-10 02:21:16,282 WARN L188 SmtUtils]: Spent 415.00 ms on a formula simplification. DAG size of input: 351 DAG size of output: 8 [2019-09-10 02:21:16,751 WARN L188 SmtUtils]: Spent 440.00 ms on a formula simplification. DAG size of input: 357 DAG size of output: 9 [2019-09-10 02:21:17,229 WARN L188 SmtUtils]: Spent 436.00 ms on a formula simplification. DAG size of input: 356 DAG size of output: 11 [2019-09-10 02:21:17,701 WARN L188 SmtUtils]: Spent 420.00 ms on a formula simplification. DAG size of input: 353 DAG size of output: 11 [2019-09-10 02:21:18,164 WARN L188 SmtUtils]: Spent 404.00 ms on a formula simplification. DAG size of input: 350 DAG size of output: 11 [2019-09-10 02:21:18,651 WARN L188 SmtUtils]: Spent 410.00 ms on a formula simplification. DAG size of input: 347 DAG size of output: 11 [2019-09-10 02:21:19,145 WARN L188 SmtUtils]: Spent 414.00 ms on a formula simplification. DAG size of input: 344 DAG size of output: 11 [2019-09-10 02:21:19,654 WARN L188 SmtUtils]: Spent 411.00 ms on a formula simplification. DAG size of input: 341 DAG size of output: 11 [2019-09-10 02:21:20,163 WARN L188 SmtUtils]: Spent 403.00 ms on a formula simplification. DAG size of input: 338 DAG size of output: 11 [2019-09-10 02:21:20,686 WARN L188 SmtUtils]: Spent 400.00 ms on a formula simplification. DAG size of input: 335 DAG size of output: 11 [2019-09-10 02:21:21,217 WARN L188 SmtUtils]: Spent 396.00 ms on a formula simplification. DAG size of input: 332 DAG size of output: 11 [2019-09-10 02:21:21,742 WARN L188 SmtUtils]: Spent 398.00 ms on a formula simplification. DAG size of input: 329 DAG size of output: 11 [2019-09-10 02:21:22,300 WARN L188 SmtUtils]: Spent 389.00 ms on a formula simplification. DAG size of input: 326 DAG size of output: 11 [2019-09-10 02:21:22,823 WARN L188 SmtUtils]: Spent 379.00 ms on a formula simplification. DAG size of input: 323 DAG size of output: 11 [2019-09-10 02:21:23,353 WARN L188 SmtUtils]: Spent 375.00 ms on a formula simplification. DAG size of input: 320 DAG size of output: 11 [2019-09-10 02:21:23,885 WARN L188 SmtUtils]: Spent 357.00 ms on a formula simplification. DAG size of input: 317 DAG size of output: 11 [2019-09-10 02:21:24,440 WARN L188 SmtUtils]: Spent 367.00 ms on a formula simplification. DAG size of input: 314 DAG size of output: 11 [2019-09-10 02:21:24,983 WARN L188 SmtUtils]: Spent 345.00 ms on a formula simplification. DAG size of input: 311 DAG size of output: 11 [2019-09-10 02:21:25,547 WARN L188 SmtUtils]: Spent 363.00 ms on a formula simplification. DAG size of input: 308 DAG size of output: 11 [2019-09-10 02:21:26,096 WARN L188 SmtUtils]: Spent 333.00 ms on a formula simplification. DAG size of input: 305 DAG size of output: 11 [2019-09-10 02:21:26,627 WARN L188 SmtUtils]: Spent 315.00 ms on a formula simplification. DAG size of input: 302 DAG size of output: 11 [2019-09-10 02:21:27,175 WARN L188 SmtUtils]: Spent 320.00 ms on a formula simplification. DAG size of input: 299 DAG size of output: 11 [2019-09-10 02:21:27,700 WARN L188 SmtUtils]: Spent 302.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2019-09-10 02:21:28,280 WARN L188 SmtUtils]: Spent 316.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2019-09-10 02:21:28,840 WARN L188 SmtUtils]: Spent 311.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2019-09-10 02:21:29,407 WARN L188 SmtUtils]: Spent 307.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2019-09-10 02:21:29,935 WARN L188 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2019-09-10 02:21:30,478 WARN L188 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2019-09-10 02:21:31,024 WARN L188 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2019-09-10 02:21:31,574 WARN L188 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2019-09-10 02:21:32,152 WARN L188 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2019-09-10 02:21:32,689 WARN L188 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2019-09-10 02:21:33,262 WARN L188 SmtUtils]: Spent 281.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2019-09-10 02:21:33,817 WARN L188 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2019-09-10 02:21:34,388 WARN L188 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-10 02:21:34,938 WARN L188 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-10 02:21:35,503 WARN L188 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-10 02:21:36,066 WARN L188 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-10 02:21:36,627 WARN L188 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-10 02:21:37,226 WARN L188 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-10 02:21:37,762 WARN L188 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-10 02:21:38,303 WARN L188 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-10 02:21:38,830 WARN L188 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-10 02:21:39,364 WARN L188 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-10 02:21:39,916 WARN L188 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-10 02:21:40,473 WARN L188 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-10 02:21:41,023 WARN L188 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-10 02:21:41,543 WARN L188 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-10 02:21:42,083 WARN L188 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-10 02:21:42,649 WARN L188 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-10 02:21:43,187 WARN L188 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-10 02:21:43,712 WARN L188 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-10 02:21:44,254 WARN L188 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-10 02:21:44,777 WARN L188 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-10 02:21:45,336 WARN L188 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-10 02:21:45,865 WARN L188 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-10 02:21:46,393 WARN L188 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-10 02:21:46,923 WARN L188 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-10 02:21:47,448 WARN L188 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-10 02:21:47,980 WARN L188 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-10 02:21:48,493 WARN L188 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-10 02:21:49,007 WARN L188 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-10 02:21:49,532 WARN L188 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-10 02:21:50,060 WARN L188 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-10 02:21:50,570 WARN L188 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-10 02:21:51,087 WARN L188 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-10 02:21:51,596 WARN L188 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-10 02:21:52,103 WARN L188 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-10 02:21:52,602 WARN L188 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-10 02:21:53,099 WARN L188 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-10 02:21:53,565 WARN L188 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-10 02:21:54,038 WARN L188 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-10 02:22:08,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-10 02:22:08,701 INFO L93 Difference]: Finished difference Result 252 states and 252 transitions. [2019-09-10 02:22:08,702 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2019-09-10 02:22:08,702 INFO L78 Accepts]: Start accepts. Automaton has 123 states. Word has length 243 [2019-09-10 02:22:08,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-10 02:22:08,703 INFO L225 Difference]: With dead ends: 252 [2019-09-10 02:22:08,703 INFO L226 Difference]: Without dead ends: 252 [2019-09-10 02:22:08,706 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 724 GetRequests, 366 SyntacticMatches, 2 SemanticMatches, 356 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8184 ImplicationChecksByTransitivity, 76.5s TimeCoverageRelationStatistics Valid=48703, Invalid=79103, Unknown=0, NotChecked=0, Total=127806 [2019-09-10 02:22:08,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2019-09-10 02:22:08,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 252. [2019-09-10 02:22:08,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 252 states. [2019-09-10 02:22:08,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 252 transitions. [2019-09-10 02:22:08,711 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 252 transitions. Word has length 243 [2019-09-10 02:22:08,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-10 02:22:08,711 INFO L475 AbstractCegarLoop]: Abstraction has 252 states and 252 transitions. [2019-09-10 02:22:08,711 INFO L476 AbstractCegarLoop]: Interpolant automaton has 123 states. [2019-09-10 02:22:08,712 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 252 transitions. [2019-09-10 02:22:08,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 252 [2019-09-10 02:22:08,713 INFO L391 BasicCegarLoop]: Found error trace [2019-09-10 02:22:08,713 INFO L399 BasicCegarLoop]: trace histogram [120, 120, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-10 02:22:08,713 INFO L418 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-10 02:22:08,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-10 02:22:08,714 INFO L82 PathProgramCache]: Analyzing trace with hash -296928497, now seen corresponding path program 31 times [2019-09-10 02:22:08,714 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-10 02:22:08,714 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:22:08,715 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-10 02:22:08,715 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-10 02:22:08,715 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-10 02:22:10,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:22:16,723 INFO L134 CoverageAnalysis]: Checked inductivity of 14400 backedges. 0 proven. 14400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:22:16,723 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:22:16,723 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-10 02:22:16,724 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-10 02:22:16,724 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-10 02:22:16,724 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-10 02:22:16,724 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-10 02:22:16,733 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-10 02:22:16,734 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-10 02:22:18,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-10 02:22:19,124 INFO L256 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 123 conjunts are in the unsatisfiable core [2019-09-10 02:22:19,126 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-10 02:22:19,536 INFO L134 CoverageAnalysis]: Checked inductivity of 14400 backedges. 0 proven. 14400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-10 02:22:19,536 INFO L322 TraceCheckSpWp]: Computing backward predicates...