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 0.1.24-0883e75 [2019-09-05 13:05:39,336 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-05 13:05:39,338 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-05 13:05:39,350 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-09-05 13:05:39,387 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 [2019-09-05 13:05:39,402 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-05 13:05:39,402 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-05 13:05:39,402 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-05 13:05:39,403 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-05 13:05:39,403 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-05 13:05:39,404 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-05 13:05:39,404 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-05 13:05:39,404 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-05 13:05:39,404 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-05 13:05:39,404 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-05 13:05:39,405 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-05 13:05:39,405 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-05 13:05:39,405 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-05 13:05:39,406 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-05 13:05:39,406 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-05 13:05:39,406 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-05 13:05:39,406 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-05 13:05:39,406 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-05 13:05:39,407 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-05 13:05:39,407 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-05 13:05:39,407 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-05 13:05:39,407 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-05 13:05:39,407 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-05 13:05:39,408 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-05 13:05:39,408 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-05 13:05:39,408 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-05 13:05:39,408 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-05 13:05:39,408 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-05 13:05:39,409 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-05 13:05:39,409 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-05 13:05:39,448 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-05 13:05:39,460 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-05 13:05:39,463 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-05 13:05:39,465 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-05 13:05:39,466 INFO L275 PluginConnector]: CDTParser initialized [2019-09-05 13:05:39,467 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-new/count_by_k.i [2019-09-05 13:05:39,527 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3b7a94964/b7ce94d3cda544659abec47c08ffdd19/FLAG1e0b87082 [2019-09-05 13:05:39,957 INFO L306 CDTParser]: Found 1 translation units. [2019-09-05 13:05:39,957 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_k.i [2019-09-05 13:05:39,962 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3b7a94964/b7ce94d3cda544659abec47c08ffdd19/FLAG1e0b87082 [2019-09-05 13:05:40,333 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3b7a94964/b7ce94d3cda544659abec47c08ffdd19 [2019-09-05 13:05:40,342 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-05 13:05:40,343 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-05 13:05:40,344 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-05 13:05:40,345 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-05 13:05:40,348 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-05 13:05:40,349 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.09 01:05:40" (1/1) ... [2019-09-05 13:05:40,352 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@531cf6da and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:05:40, skipping insertion in model container [2019-09-05 13:05:40,352 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.09 01:05:40" (1/1) ... [2019-09-05 13:05:40,361 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-05 13:05:40,377 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-05 13:05:40,589 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-05 13:05:40,595 INFO L188 MainTranslator]: Completed pre-run [2019-09-05 13:05:40,619 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-05 13:05:40,636 INFO L192 MainTranslator]: Completed translation [2019-09-05 13:05:40,636 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:05:40 WrapperNode [2019-09-05 13:05:40,637 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-05 13:05:40,637 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-05 13:05:40,638 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-05 13:05:40,638 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-05 13:05:40,653 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:05:40" (1/1) ... [2019-09-05 13:05:40,655 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:05:40" (1/1) ... [2019-09-05 13:05:40,665 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:05:40" (1/1) ... [2019-09-05 13:05:40,666 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:05:40" (1/1) ... [2019-09-05 13:05:40,670 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:05:40" (1/1) ... [2019-09-05 13:05:40,677 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:05:40" (1/1) ... [2019-09-05 13:05:40,678 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:05:40" (1/1) ... [2019-09-05 13:05:40,795 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-05 13:05:40,799 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-05 13:05:40,799 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-05 13:05:40,799 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-05 13:05:40,800 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:05:40" (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 [2019-09-05 13:05:40,865 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-05 13:05:40,865 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-05 13:05:40,866 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-05 13:05:40,866 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-05 13:05:40,866 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-05 13:05:40,866 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-09-05 13:05:40,866 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-05 13:05:40,866 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-09-05 13:05:40,866 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-05 13:05:40,866 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-05 13:05:40,867 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-05 13:05:41,024 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-05 13:05:41,024 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-05 13:05:41,026 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.09 01:05:41 BoogieIcfgContainer [2019-09-05 13:05:41,026 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-05 13:05:41,027 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-05 13:05:41,027 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-05 13:05:41,030 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-05 13:05:41,030 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 05.09 01:05:40" (1/3) ... [2019-09-05 13:05:41,031 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e7d8871 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.09 01:05:41, skipping insertion in model container [2019-09-05 13:05:41,031 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:05:40" (2/3) ... [2019-09-05 13:05:41,032 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e7d8871 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.09 01:05:41, skipping insertion in model container [2019-09-05 13:05:41,032 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.09 01:05:41" (3/3) ... [2019-09-05 13:05:41,034 INFO L109 eAbstractionObserver]: Analyzing ICFG count_by_k.i [2019-09-05 13:05:41,043 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-05 13:05:41,051 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-05 13:05:41,077 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-05 13:05:41,129 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-05 13:05:41,129 INFO L378 AbstractCegarLoop]: Hoare is false [2019-09-05 13:05:41,129 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-05 13:05:41,129 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-05 13:05:41,130 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-05 13:05:41,130 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-05 13:05:41,130 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-05 13:05:41,130 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-05 13:05:41,147 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2019-09-05 13:05:41,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-09-05 13:05:41,157 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:05:41,159 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:05:41,162 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:05:41,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:05:41,170 INFO L82 PathProgramCache]: Analyzing trace with hash -1281911547, now seen corresponding path program 1 times [2019-09-05 13:05:41,172 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:05:41,219 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:05:41,219 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:05:41,219 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:05:41,220 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:05:41,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:05:41,286 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:41,289 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-05 13:05:41,289 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-09-05 13:05:41,289 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-05 13:05:41,294 INFO L454 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-09-05 13:05:41,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-09-05 13:05:41,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-09-05 13:05:41,309 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2019-09-05 13:05:41,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:05:41,322 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2019-09-05 13:05:41,322 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-09-05 13:05:41,324 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2019-09-05 13:05:41,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:05:41,332 INFO L225 Difference]: With dead ends: 20 [2019-09-05 13:05:41,332 INFO L226 Difference]: Without dead ends: 13 [2019-09-05 13:05:41,334 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 [2019-09-05 13:05:41,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-09-05 13:05:41,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-09-05 13:05:41,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-09-05 13:05:41,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2019-09-05 13:05:41,367 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2019-09-05 13:05:41,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:05:41,368 INFO L475 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2019-09-05 13:05:41,368 INFO L476 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-09-05 13:05:41,370 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2019-09-05 13:05:41,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-09-05 13:05:41,371 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:05:41,372 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:05:41,372 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:05:41,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:05:41,374 INFO L82 PathProgramCache]: Analyzing trace with hash -1287452673, now seen corresponding path program 1 times [2019-09-05 13:05:41,375 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:05:41,379 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:05:41,379 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:05:41,380 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:05:41,380 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:05:41,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:05:41,550 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:41,550 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-05 13:05:41,550 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-09-05 13:05:41,551 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-05 13:05:41,552 INFO L454 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-09-05 13:05:41,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-09-05 13:05:41,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2019-09-05 13:05:41,553 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 6 states. [2019-09-05 13:05:41,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:05:41,616 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2019-09-05 13:05:41,616 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-05 13:05:41,617 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 11 [2019-09-05 13:05:41,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:05:41,618 INFO L225 Difference]: With dead ends: 17 [2019-09-05 13:05:41,618 INFO L226 Difference]: Without dead ends: 14 [2019-09-05 13:05:41,619 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 [2019-09-05 13:05:41,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-09-05 13:05:41,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-09-05 13:05:41,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-09-05 13:05:41,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2019-09-05 13:05:41,623 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2019-09-05 13:05:41,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:05:41,624 INFO L475 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2019-09-05 13:05:41,624 INFO L476 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-09-05 13:05:41,624 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2019-09-05 13:05:41,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-09-05 13:05:41,625 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:05:41,625 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:05:41,625 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:05:41,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:05:41,626 INFO L82 PathProgramCache]: Analyzing trace with hash 843923389, now seen corresponding path program 1 times [2019-09-05 13:05:41,626 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:05:41,627 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:05:41,627 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:05:41,627 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:05:41,628 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:05:41,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:05:41,743 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:41,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:05:41,743 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:05:41,744 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2019-09-05 13:05:41,746 INFO L207 CegarAbsIntRunner]: [0], [4], [8], [14], [16], [18], [25], [28], [30], [36], [37], [38], [40] [2019-09-05 13:05:41,782 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-05 13:05:41,783 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-05 13:05:41,916 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-05 13:05:41,919 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. [2019-09-05 13:05:41,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:05:41,923 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-05 13:05:41,923 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:05:41,923 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 [2019-09-05 13:05:41,935 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:05:41,935 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-05 13:05:41,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:05:41,948 INFO L256 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2019-09-05 13:05:41,954 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:05:42,022 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:42,023 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:05:42,106 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:42,116 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:05:42,116 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 13 [2019-09-05 13:05:42,116 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:05:42,117 INFO L454 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-09-05 13:05:42,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-09-05 13:05:42,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2019-09-05 13:05:42,118 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 10 states. [2019-09-05 13:05:42,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:05:42,274 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2019-09-05 13:05:42,275 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-09-05 13:05:42,275 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 13 [2019-09-05 13:05:42,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:05:42,276 INFO L225 Difference]: With dead ends: 24 [2019-09-05 13:05:42,276 INFO L226 Difference]: Without dead ends: 20 [2019-09-05 13:05:42,277 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2019-09-05 13:05:42,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-09-05 13:05:42,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-09-05 13:05:42,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-09-05 13:05:42,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2019-09-05 13:05:42,285 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 13 [2019-09-05 13:05:42,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:05:42,285 INFO L475 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2019-09-05 13:05:42,286 INFO L476 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-09-05 13:05:42,286 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2019-09-05 13:05:42,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-09-05 13:05:42,286 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:05:42,287 INFO L399 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:05:42,288 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:05:42,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:05:42,288 INFO L82 PathProgramCache]: Analyzing trace with hash 1549375991, now seen corresponding path program 2 times [2019-09-05 13:05:42,288 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:05:42,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:05:42,290 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:05:42,291 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:05:42,291 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:05:42,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:05:42,421 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:42,422 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:05:42,422 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:05:42,422 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:05:42,422 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:05:42,422 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:05:42,423 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) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:05:42,457 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 13:05:42,458 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-05 13:05:42,471 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-09-05 13:05:42,471 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:05:42,472 INFO L256 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 7 conjunts are in the unsatisfiable core [2019-09-05 13:05:42,473 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:05:42,546 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:42,547 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:05:42,672 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:42,677 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:05:42,677 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2019-09-05 13:05:42,677 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:05:42,678 INFO L454 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-09-05 13:05:42,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-09-05 13:05:42,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2019-09-05 13:05:42,681 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 11 states. [2019-09-05 13:05:42,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:05:42,876 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2019-09-05 13:05:42,876 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-09-05 13:05:42,877 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 19 [2019-09-05 13:05:42,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:05:42,878 INFO L225 Difference]: With dead ends: 28 [2019-09-05 13:05:42,878 INFO L226 Difference]: Without dead ends: 28 [2019-09-05 13:05:42,879 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 [2019-09-05 13:05:42,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-09-05 13:05:42,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-09-05 13:05:42,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-09-05 13:05:42,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2019-09-05 13:05:42,883 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 19 [2019-09-05 13:05:42,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:05:42,885 INFO L475 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2019-09-05 13:05:42,885 INFO L476 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-09-05 13:05:42,886 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2019-09-05 13:05:42,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-09-05 13:05:42,886 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:05:42,887 INFO L399 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:05:42,887 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:05:42,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:05:42,887 INFO L82 PathProgramCache]: Analyzing trace with hash -191187985, now seen corresponding path program 3 times [2019-09-05 13:05:42,888 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:05:42,893 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:05:42,893 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:05:42,893 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:05:42,894 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:05:42,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:05:43,067 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:43,068 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:05:43,068 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:05:43,068 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:05:43,068 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:05:43,069 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:05:43,069 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) [2019-09-05 13:05:43,082 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 13:05:43,083 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 [2019-09-05 13:05:43,096 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 13:05:43,096 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:05:43,097 INFO L256 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 11 conjunts are in the unsatisfiable core [2019-09-05 13:05:43,099 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:05:43,177 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:43,178 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:05:43,428 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:43,432 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:05:43,432 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2019-09-05 13:05:43,433 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:05:43,434 INFO L454 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-09-05 13:05:43,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-09-05 13:05:43,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=354, Unknown=0, NotChecked=0, Total=506 [2019-09-05 13:05:43,437 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 15 states. [2019-09-05 13:05:43,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:05:43,786 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2019-09-05 13:05:43,786 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-09-05 13:05:43,787 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 27 [2019-09-05 13:05:43,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:05:43,788 INFO L225 Difference]: With dead ends: 36 [2019-09-05 13:05:43,788 INFO L226 Difference]: Without dead ends: 36 [2019-09-05 13:05:43,789 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 [2019-09-05 13:05:43,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-09-05 13:05:43,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2019-09-05 13:05:43,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-09-05 13:05:43,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2019-09-05 13:05:43,794 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 27 [2019-09-05 13:05:43,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:05:43,794 INFO L475 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2019-09-05 13:05:43,794 INFO L476 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-09-05 13:05:43,795 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2019-09-05 13:05:43,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-09-05 13:05:43,798 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:05:43,798 INFO L399 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:05:43,799 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:05:43,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:05:43,799 INFO L82 PathProgramCache]: Analyzing trace with hash 217994727, now seen corresponding path program 4 times [2019-09-05 13:05:43,799 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:05:43,800 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:05:43,800 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:05:43,800 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:05:43,800 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:05:43,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:05:44,037 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:44,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:05:44,038 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:05:44,038 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:05:44,038 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:05:44,038 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:05:44,038 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) [2019-09-05 13:05:44,057 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:05:44,058 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:05:44,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:05:44,075 INFO L256 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 15 conjunts are in the unsatisfiable core [2019-09-05 13:05:44,077 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:05:44,177 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:44,178 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:05:44,554 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:44,557 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:05:44,558 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2019-09-05 13:05:44,558 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:05:44,558 INFO L454 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-09-05 13:05:44,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-09-05 13:05:44,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=640, Unknown=0, NotChecked=0, Total=930 [2019-09-05 13:05:44,560 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 19 states. [2019-09-05 13:05:45,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:05:45,134 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2019-09-05 13:05:45,136 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-09-05 13:05:45,136 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 35 [2019-09-05 13:05:45,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:05:45,137 INFO L225 Difference]: With dead ends: 44 [2019-09-05 13:05:45,137 INFO L226 Difference]: Without dead ends: 44 [2019-09-05 13:05:45,139 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 [2019-09-05 13:05:45,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-09-05 13:05:45,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2019-09-05 13:05:45,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-09-05 13:05:45,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2019-09-05 13:05:45,144 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 35 [2019-09-05 13:05:45,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:05:45,145 INFO L475 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2019-09-05 13:05:45,145 INFO L476 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-09-05 13:05:45,145 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2019-09-05 13:05:45,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-09-05 13:05:45,146 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:05:45,147 INFO L399 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:05:45,147 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:05:45,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:05:45,147 INFO L82 PathProgramCache]: Analyzing trace with hash -1099137057, now seen corresponding path program 5 times [2019-09-05 13:05:45,147 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:05:45,148 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:05:45,148 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:05:45,148 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:05:45,149 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:05:45,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:05:45,433 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:45,433 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:05:45,433 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:05:45,434 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:05:45,434 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:05:45,434 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:05:45,434 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) [2019-09-05 13:05:45,451 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 13:05:45,451 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:05:45,475 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2019-09-05 13:05:45,476 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:05:45,477 INFO L256 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 19 conjunts are in the unsatisfiable core [2019-09-05 13:05:45,480 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:05:45,592 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:45,592 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:05:46,173 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:46,176 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:05:46,177 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2019-09-05 13:05:46,177 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:05:46,177 INFO L454 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-09-05 13:05:46,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-09-05 13:05:46,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=476, Invalid=1006, Unknown=0, NotChecked=0, Total=1482 [2019-09-05 13:05:46,179 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 23 states. [2019-09-05 13:05:47,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:05:47,029 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2019-09-05 13:05:47,030 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-09-05 13:05:47,030 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 43 [2019-09-05 13:05:47,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:05:47,032 INFO L225 Difference]: With dead ends: 52 [2019-09-05 13:05:47,032 INFO L226 Difference]: Without dead ends: 52 [2019-09-05 13:05:47,033 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 [2019-09-05 13:05:47,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-09-05 13:05:47,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2019-09-05 13:05:47,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-09-05 13:05:47,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2019-09-05 13:05:47,039 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 43 [2019-09-05 13:05:47,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:05:47,039 INFO L475 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2019-09-05 13:05:47,039 INFO L476 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-09-05 13:05:47,039 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2019-09-05 13:05:47,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-09-05 13:05:47,041 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:05:47,041 INFO L399 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:05:47,041 INFO L418 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:05:47,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:05:47,042 INFO L82 PathProgramCache]: Analyzing trace with hash -1441975849, now seen corresponding path program 6 times [2019-09-05 13:05:47,042 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:05:47,043 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:05:47,043 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:05:47,043 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:05:47,043 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:05:47,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:05:47,384 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:47,384 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:05:47,385 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:05:47,385 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:05:47,385 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:05:47,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:05:47,385 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) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:05:47,398 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 13:05:47,398 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-05 13:05:47,418 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 13:05:47,419 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:05:47,423 INFO L256 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 23 conjunts are in the unsatisfiable core [2019-09-05 13:05:47,426 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:05:47,534 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:47,534 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:05:48,314 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:48,321 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:05:48,321 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2019-09-05 13:05:48,321 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:05:48,322 INFO L454 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-09-05 13:05:48,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-09-05 13:05:48,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=710, Invalid=1452, Unknown=0, NotChecked=0, Total=2162 [2019-09-05 13:05:48,324 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 27 states. [2019-09-05 13:05:49,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:05:49,504 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2019-09-05 13:05:49,507 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-09-05 13:05:49,507 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 51 [2019-09-05 13:05:49,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:05:49,508 INFO L225 Difference]: With dead ends: 60 [2019-09-05 13:05:49,509 INFO L226 Difference]: Without dead ends: 60 [2019-09-05 13:05:49,510 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 [2019-09-05 13:05:49,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-09-05 13:05:49,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2019-09-05 13:05:49,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-09-05 13:05:49,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2019-09-05 13:05:49,516 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 51 [2019-09-05 13:05:49,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:05:49,517 INFO L475 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2019-09-05 13:05:49,517 INFO L476 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-09-05 13:05:49,517 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2019-09-05 13:05:49,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2019-09-05 13:05:49,518 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:05:49,518 INFO L399 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:05:49,518 INFO L418 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:05:49,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:05:49,519 INFO L82 PathProgramCache]: Analyzing trace with hash -123180081, now seen corresponding path program 7 times [2019-09-05 13:05:49,519 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:05:49,520 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:05:49,520 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:05:49,520 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:05:49,520 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:05:49,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:05:50,269 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:50,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:05:50,269 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:05:50,270 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:05:50,270 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:05:50,270 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:05:50,270 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 [2019-09-05 13:05:50,286 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:05:50,286 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-05 13:05:50,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:05:50,328 INFO L256 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 27 conjunts are in the unsatisfiable core [2019-09-05 13:05:50,331 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:05:50,433 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:50,433 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:05:51,588 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 [2019-09-05 13:05:51,602 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:05:51,602 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2019-09-05 13:05:51,603 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:05:51,605 INFO L454 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-09-05 13:05:51,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-09-05 13:05:51,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=992, Invalid=1978, Unknown=0, NotChecked=0, Total=2970 [2019-09-05 13:05:51,607 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 31 states. [2019-09-05 13:05:53,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:05:53,304 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2019-09-05 13:05:53,304 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-09-05 13:05:53,305 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 59 [2019-09-05 13:05:53,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:05:53,306 INFO L225 Difference]: With dead ends: 68 [2019-09-05 13:05:53,306 INFO L226 Difference]: Without dead ends: 68 [2019-09-05 13:05:53,313 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 594 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=2381, Invalid=4261, Unknown=0, NotChecked=0, Total=6642 [2019-09-05 13:05:53,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-09-05 13:05:53,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2019-09-05 13:05:53,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2019-09-05 13:05:53,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 68 transitions. [2019-09-05 13:05:53,330 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 68 transitions. Word has length 59 [2019-09-05 13:05:53,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:05:53,330 INFO L475 AbstractCegarLoop]: Abstraction has 68 states and 68 transitions. [2019-09-05 13:05:53,331 INFO L476 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-09-05 13:05:53,331 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 68 transitions. [2019-09-05 13:05:53,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-09-05 13:05:53,334 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:05:53,334 INFO L399 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:05:53,334 INFO L418 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:05:53,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:05:53,335 INFO L82 PathProgramCache]: Analyzing trace with hash 1531325895, now seen corresponding path program 8 times [2019-09-05 13:05:53,335 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:05:53,336 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:05:53,336 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:05:53,336 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:05:53,336 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:05:53,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:05:53,939 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:53,940 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:05:53,940 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:05:53,940 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:05:53,940 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:05:53,940 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:05:53,940 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 [2019-09-05 13:05:53,954 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 13:05:53,955 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-05 13:05:54,007 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2019-09-05 13:05:54,008 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:05:54,009 INFO L256 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 31 conjunts are in the unsatisfiable core [2019-09-05 13:05:54,013 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:05:54,185 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:54,186 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:05:55,698 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:55,702 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:05:55,703 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2019-09-05 13:05:55,703 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:05:55,704 INFO L454 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-09-05 13:05:55,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-09-05 13:05:55,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1322, Invalid=2584, Unknown=0, NotChecked=0, Total=3906 [2019-09-05 13:05:55,706 INFO L87 Difference]: Start difference. First operand 68 states and 68 transitions. Second operand 35 states. [2019-09-05 13:05:57,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:05:57,926 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2019-09-05 13:05:57,927 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-09-05 13:05:57,928 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 67 [2019-09-05 13:05:57,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:05:57,929 INFO L225 Difference]: With dead ends: 76 [2019-09-05 13:05:57,929 INFO L226 Difference]: Without dead ends: 76 [2019-09-05 13:05:57,932 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 [2019-09-05 13:05:57,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-09-05 13:05:57,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2019-09-05 13:05:57,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-09-05 13:05:57,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 76 transitions. [2019-09-05 13:05:57,939 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 76 transitions. Word has length 67 [2019-09-05 13:05:57,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:05:57,939 INFO L475 AbstractCegarLoop]: Abstraction has 76 states and 76 transitions. [2019-09-05 13:05:57,939 INFO L476 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-09-05 13:05:57,939 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 76 transitions. [2019-09-05 13:05:57,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-09-05 13:05:57,941 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:05:57,941 INFO L399 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:05:57,941 INFO L418 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:05:57,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:05:57,941 INFO L82 PathProgramCache]: Analyzing trace with hash 182351807, now seen corresponding path program 9 times [2019-09-05 13:05:57,942 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:05:57,942 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:05:57,942 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:05:57,943 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:05:57,943 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:05:58,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:05:58,647 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:58,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:05:58,648 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:05:58,648 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:05:58,648 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:05:58,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:05:58,648 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 [2019-09-05 13:05:58,659 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 13:05:58,659 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-05 13:05:58,684 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 13:05:58,684 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:05:58,688 INFO L256 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 35 conjunts are in the unsatisfiable core [2019-09-05 13:05:58,691 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:05:58,836 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:05:58,836 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:06:00,476 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:06:00,480 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:06:00,480 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 71 [2019-09-05 13:06:00,480 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:06:00,480 INFO L454 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-09-05 13:06:00,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-09-05 13:06:00,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1700, Invalid=3270, Unknown=0, NotChecked=0, Total=4970 [2019-09-05 13:06:00,482 INFO L87 Difference]: Start difference. First operand 76 states and 76 transitions. Second operand 39 states. [2019-09-05 13:06:03,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:06:03,106 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2019-09-05 13:06:03,106 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-09-05 13:06:03,106 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 75 [2019-09-05 13:06:03,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:06:03,107 INFO L225 Difference]: With dead ends: 84 [2019-09-05 13:06:03,108 INFO L226 Difference]: Without dead ends: 84 [2019-09-05 13:06:03,112 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 [2019-09-05 13:06:03,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2019-09-05 13:06:03,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2019-09-05 13:06:03,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2019-09-05 13:06:03,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 84 transitions. [2019-09-05 13:06:03,118 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 84 transitions. Word has length 75 [2019-09-05 13:06:03,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:06:03,118 INFO L475 AbstractCegarLoop]: Abstraction has 84 states and 84 transitions. [2019-09-05 13:06:03,119 INFO L476 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-09-05 13:06:03,119 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 84 transitions. [2019-09-05 13:06:03,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2019-09-05 13:06:03,120 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:06:03,120 INFO L399 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:06:03,121 INFO L418 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:06:03,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:06:03,121 INFO L82 PathProgramCache]: Analyzing trace with hash -932623945, now seen corresponding path program 10 times [2019-09-05 13:06:03,121 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:06:03,122 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:06:03,122 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:06:03,122 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:06:03,122 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:06:03,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:06:03,915 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:06:03,915 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:06:03,915 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:06:03,915 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:06:03,915 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:06:03,915 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:06:03,916 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 [2019-09-05 13:06:03,926 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:06:03,926 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-05 13:06:04,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:06:04,032 INFO L256 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 39 conjunts are in the unsatisfiable core [2019-09-05 13:06:04,035 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:06:04,185 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:06:04,185 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:06:06,146 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:06:06,159 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:06:06,159 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2019-09-05 13:06:06,160 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:06:06,161 INFO L454 AbstractCegarLoop]: Interpolant automaton has 43 states [2019-09-05 13:06:06,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2019-09-05 13:06:06,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2126, Invalid=4036, Unknown=0, NotChecked=0, Total=6162 [2019-09-05 13:06:06,165 INFO L87 Difference]: Start difference. First operand 84 states and 84 transitions. Second operand 43 states. [2019-09-05 13:06:09,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:06:09,498 INFO L93 Difference]: Finished difference Result 92 states and 92 transitions. [2019-09-05 13:06:09,499 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2019-09-05 13:06:09,499 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 83 [2019-09-05 13:06:09,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:06:09,500 INFO L225 Difference]: With dead ends: 92 [2019-09-05 13:06:09,500 INFO L226 Difference]: Without dead ends: 92 [2019-09-05 13:06:09,502 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 126 SyntacticMatches, 2 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1104 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=5063, Invalid=8743, Unknown=0, NotChecked=0, Total=13806 [2019-09-05 13:06:09,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2019-09-05 13:06:09,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2019-09-05 13:06:09,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2019-09-05 13:06:09,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 92 transitions. [2019-09-05 13:06:09,509 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 92 transitions. Word has length 83 [2019-09-05 13:06:09,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:06:09,509 INFO L475 AbstractCegarLoop]: Abstraction has 92 states and 92 transitions. [2019-09-05 13:06:09,509 INFO L476 AbstractCegarLoop]: Interpolant automaton has 43 states. [2019-09-05 13:06:09,509 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 92 transitions. [2019-09-05 13:06:09,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2019-09-05 13:06:09,511 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:06:09,511 INFO L399 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:06:09,512 INFO L418 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:06:09,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:06:09,512 INFO L82 PathProgramCache]: Analyzing trace with hash -589388881, now seen corresponding path program 11 times [2019-09-05 13:06:09,512 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:06:09,513 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:06:09,513 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:06:09,513 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:06:09,513 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:06:09,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:06:10,583 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:06:10,583 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:06:10,584 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:06:10,584 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:06:10,584 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:06:10,584 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:06:10,584 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 [2019-09-05 13:06:10,595 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 13:06:10,596 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-05 13:06:10,650 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2019-09-05 13:06:10,650 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:06:10,652 INFO L256 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 43 conjunts are in the unsatisfiable core [2019-09-05 13:06:10,654 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:06:10,843 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:06:10,843 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:06:13,205 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:06:13,208 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:06:13,208 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 87 [2019-09-05 13:06:13,208 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:06:13,209 INFO L454 AbstractCegarLoop]: Interpolant automaton has 47 states [2019-09-05 13:06:13,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2019-09-05 13:06:13,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2600, Invalid=4882, Unknown=0, NotChecked=0, Total=7482 [2019-09-05 13:06:13,210 INFO L87 Difference]: Start difference. First operand 92 states and 92 transitions. Second operand 47 states. [2019-09-05 13:06:17,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:06:17,336 INFO L93 Difference]: Finished difference Result 100 states and 100 transitions. [2019-09-05 13:06:17,337 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2019-09-05 13:06:17,337 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 91 [2019-09-05 13:06:17,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:06:17,338 INFO L225 Difference]: With dead ends: 100 [2019-09-05 13:06:17,338 INFO L226 Difference]: Without dead ends: 100 [2019-09-05 13:06:17,339 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 138 SyntacticMatches, 2 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1306 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=6181, Invalid=10589, Unknown=0, NotChecked=0, Total=16770 [2019-09-05 13:06:17,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2019-09-05 13:06:17,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2019-09-05 13:06:17,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2019-09-05 13:06:17,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 100 transitions. [2019-09-05 13:06:17,345 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 100 transitions. Word has length 91 [2019-09-05 13:06:17,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:06:17,345 INFO L475 AbstractCegarLoop]: Abstraction has 100 states and 100 transitions. [2019-09-05 13:06:17,346 INFO L476 AbstractCegarLoop]: Interpolant automaton has 47 states. [2019-09-05 13:06:17,346 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 100 transitions. [2019-09-05 13:06:17,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2019-09-05 13:06:17,347 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:06:17,347 INFO L399 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:06:17,347 INFO L418 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:06:17,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:06:17,348 INFO L82 PathProgramCache]: Analyzing trace with hash 423003559, now seen corresponding path program 12 times [2019-09-05 13:06:17,348 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:06:17,349 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:06:17,349 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:06:17,349 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:06:17,349 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:06:17,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:06:18,526 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:06:18,526 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:06:18,526 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:06:18,526 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:06:18,526 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:06:18,526 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:06:18,527 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 [2019-09-05 13:06:18,537 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 13:06:18,537 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-05 13:06:18,609 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 13:06:18,609 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:06:18,636 INFO L256 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 47 conjunts are in the unsatisfiable core [2019-09-05 13:06:18,638 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:06:18,790 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:06:18,791 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:06:21,554 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:06:21,557 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:06:21,557 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 95 [2019-09-05 13:06:21,557 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:06:21,557 INFO L454 AbstractCegarLoop]: Interpolant automaton has 51 states [2019-09-05 13:06:21,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2019-09-05 13:06:21,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3122, Invalid=5808, Unknown=0, NotChecked=0, Total=8930 [2019-09-05 13:06:21,560 INFO L87 Difference]: Start difference. First operand 100 states and 100 transitions. Second operand 51 states. [2019-09-05 13:06:26,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:06:26,677 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2019-09-05 13:06:26,677 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2019-09-05 13:06:26,677 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 99 [2019-09-05 13:06:26,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:06:26,678 INFO L225 Difference]: With dead ends: 108 [2019-09-05 13:06:26,678 INFO L226 Difference]: Without dead ends: 108 [2019-09-05 13:06:26,679 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 150 SyntacticMatches, 2 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1524 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=7411, Invalid=12611, Unknown=0, NotChecked=0, Total=20022 [2019-09-05 13:06:26,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2019-09-05 13:06:26,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2019-09-05 13:06:26,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2019-09-05 13:06:26,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 108 transitions. [2019-09-05 13:06:26,692 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 108 transitions. Word has length 99 [2019-09-05 13:06:26,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:06:26,692 INFO L475 AbstractCegarLoop]: Abstraction has 108 states and 108 transitions. [2019-09-05 13:06:26,692 INFO L476 AbstractCegarLoop]: Interpolant automaton has 51 states. [2019-09-05 13:06:26,692 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 108 transitions. [2019-09-05 13:06:26,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2019-09-05 13:06:26,697 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:06:26,697 INFO L399 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:06:26,697 INFO L418 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:06:26,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:06:26,698 INFO L82 PathProgramCache]: Analyzing trace with hash -697765985, now seen corresponding path program 13 times [2019-09-05 13:06:26,698 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:06:26,698 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:06:26,698 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:06:26,699 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:06:26,699 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:06:26,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:06:28,058 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:06:28,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:06:28,058 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:06:28,058 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:06:28,059 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:06:28,059 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:06:28,059 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) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:06:28,069 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:06:28,069 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-05 13:06:28,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:06:28,250 INFO L256 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 51 conjunts are in the unsatisfiable core [2019-09-05 13:06:28,252 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:06:28,432 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:06:28,433 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:06:31,736 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:06:31,739 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:06:31,740 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 103 [2019-09-05 13:06:31,740 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:06:31,741 INFO L454 AbstractCegarLoop]: Interpolant automaton has 55 states [2019-09-05 13:06:31,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2019-09-05 13:06:31,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3692, Invalid=6814, Unknown=0, NotChecked=0, Total=10506 [2019-09-05 13:06:31,750 INFO L87 Difference]: Start difference. First operand 108 states and 108 transitions. Second operand 55 states. [2019-09-05 13:06:32,184 WARN L188 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 9 [2019-09-05 13:06:32,328 WARN L188 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-05 13:06:32,457 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-05 13:06:37,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:06:37,885 INFO L93 Difference]: Finished difference Result 116 states and 116 transitions. [2019-09-05 13:06:37,886 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2019-09-05 13:06:37,887 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 107 [2019-09-05 13:06:37,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:06:37,888 INFO L225 Difference]: With dead ends: 116 [2019-09-05 13:06:37,888 INFO L226 Difference]: Without dead ends: 116 [2019-09-05 13:06:37,889 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 162 SyntacticMatches, 2 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1758 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=8753, Invalid=14809, Unknown=0, NotChecked=0, Total=23562 [2019-09-05 13:06:37,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2019-09-05 13:06:37,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2019-09-05 13:06:37,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2019-09-05 13:06:37,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 116 transitions. [2019-09-05 13:06:37,894 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 116 transitions. Word has length 107 [2019-09-05 13:06:37,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:06:37,895 INFO L475 AbstractCegarLoop]: Abstraction has 116 states and 116 transitions. [2019-09-05 13:06:37,895 INFO L476 AbstractCegarLoop]: Interpolant automaton has 55 states. [2019-09-05 13:06:37,895 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 116 transitions. [2019-09-05 13:06:37,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2019-09-05 13:06:37,896 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:06:37,896 INFO L399 BasicCegarLoop]: trace histogram [52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:06:37,897 INFO L418 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:06:37,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:06:37,897 INFO L82 PathProgramCache]: Analyzing trace with hash -177348201, now seen corresponding path program 14 times [2019-09-05 13:06:37,897 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:06:37,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:06:37,898 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:06:37,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:06:37,898 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:06:38,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:06:39,421 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:06:39,422 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:06:39,422 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:06:39,422 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:06:39,422 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:06:39,422 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:06:39,422 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 [2019-09-05 13:06:39,437 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 13:06:39,437 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-05 13:06:39,505 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 53 check-sat command(s) [2019-09-05 13:06:39,506 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:06:39,508 INFO L256 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 55 conjunts are in the unsatisfiable core [2019-09-05 13:06:39,510 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:06:39,709 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:06:39,709 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:06:43,623 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (15)] Exception during sending of exit command (exit): Broken pipe [2019-09-05 13:06:43,629 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:06:43,629 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 111 [2019-09-05 13:06:43,629 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:06:43,630 INFO L454 AbstractCegarLoop]: Interpolant automaton has 59 states [2019-09-05 13:06:43,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2019-09-05 13:06:43,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4310, Invalid=7900, Unknown=0, NotChecked=0, Total=12210 [2019-09-05 13:06:43,631 INFO L87 Difference]: Start difference. First operand 116 states and 116 transitions. Second operand 59 states. [2019-09-05 13:06:43,852 WARN L188 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 8 [2019-09-05 13:06:43,999 WARN L188 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 8 [2019-09-05 13:06:44,143 WARN L188 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 9 [2019-09-05 13:06:44,286 WARN L188 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-05 13:06:44,434 WARN L188 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-05 13:06:44,577 WARN L188 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-05 13:06:44,726 WARN L188 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-05 13:06:44,880 WARN L188 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-05 13:06:45,031 WARN L188 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-05 13:06:45,179 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-05 13:06:50,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:06:50,994 INFO L93 Difference]: Finished difference Result 124 states and 124 transitions. [2019-09-05 13:06:50,994 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2019-09-05 13:06:50,995 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 115 [2019-09-05 13:06:50,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:06:50,996 INFO L225 Difference]: With dead ends: 124 [2019-09-05 13:06:50,996 INFO L226 Difference]: Without dead ends: 124 [2019-09-05 13:06:50,997 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 174 SyntacticMatches, 2 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2008 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=10207, Invalid=17183, Unknown=0, NotChecked=0, Total=27390 [2019-09-05 13:06:50,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2019-09-05 13:06:51,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2019-09-05 13:06:51,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2019-09-05 13:06:51,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 124 transitions. [2019-09-05 13:06:51,001 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 124 transitions. Word has length 115 [2019-09-05 13:06:51,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:06:51,002 INFO L475 AbstractCegarLoop]: Abstraction has 124 states and 124 transitions. [2019-09-05 13:06:51,002 INFO L476 AbstractCegarLoop]: Interpolant automaton has 59 states. [2019-09-05 13:06:51,002 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 124 transitions. [2019-09-05 13:06:51,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2019-09-05 13:06:51,003 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:06:51,003 INFO L399 BasicCegarLoop]: trace histogram [56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:06:51,003 INFO L418 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:06:51,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:06:51,004 INFO L82 PathProgramCache]: Analyzing trace with hash -549626993, now seen corresponding path program 15 times [2019-09-05 13:06:51,004 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:06:51,005 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:06:51,005 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:06:51,005 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:06:51,005 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:06:51,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:06:52,973 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:06:52,973 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:06:52,973 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:06:52,974 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:06:52,974 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:06:52,974 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:06:52,974 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 [2019-09-05 13:06:52,983 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 13:06:52,984 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-05 13:06:53,188 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 13:06:53,188 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:06:53,323 INFO L256 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 59 conjunts are in the unsatisfiable core [2019-09-05 13:06:53,326 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:06:53,544 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:06:53,544 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:06:57,919 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:06:57,922 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:06:57,923 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 119 [2019-09-05 13:06:57,923 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:06:57,923 INFO L454 AbstractCegarLoop]: Interpolant automaton has 63 states [2019-09-05 13:06:57,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2019-09-05 13:06:57,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4976, Invalid=9066, Unknown=0, NotChecked=0, Total=14042 [2019-09-05 13:06:57,925 INFO L87 Difference]: Start difference. First operand 124 states and 124 transitions. Second operand 63 states. [2019-09-05 13:06:58,132 WARN L188 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 168 DAG size of output: 8 [2019-09-05 13:06:58,267 WARN L188 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 8 [2019-09-05 13:06:58,419 WARN L188 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 9 [2019-09-05 13:06:58,571 WARN L188 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-05 13:06:58,730 WARN L188 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-05 13:06:58,890 WARN L188 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-05 13:06:59,055 WARN L188 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-05 13:06:59,222 WARN L188 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-05 13:06:59,387 WARN L188 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-05 13:06:59,556 WARN L188 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-05 13:06:59,727 WARN L188 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-05 13:06:59,897 WARN L188 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-05 13:07:00,064 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-05 13:07:00,251 WARN L188 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-05 13:07:00,419 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2019-09-05 13:07:00,601 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2019-09-05 13:07:06,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:07:06,592 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2019-09-05 13:07:06,592 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2019-09-05 13:07:06,592 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 123 [2019-09-05 13:07:06,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:07:06,594 INFO L225 Difference]: With dead ends: 132 [2019-09-05 13:07:06,594 INFO L226 Difference]: Without dead ends: 132 [2019-09-05 13:07:06,596 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 186 SyntacticMatches, 2 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2274 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=11773, Invalid=19733, Unknown=0, NotChecked=0, Total=31506 [2019-09-05 13:07:06,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2019-09-05 13:07:06,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2019-09-05 13:07:06,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2019-09-05 13:07:06,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 132 transitions. [2019-09-05 13:07:06,599 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 132 transitions. Word has length 123 [2019-09-05 13:07:06,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:07:06,599 INFO L475 AbstractCegarLoop]: Abstraction has 132 states and 132 transitions. [2019-09-05 13:07:06,599 INFO L476 AbstractCegarLoop]: Interpolant automaton has 63 states. [2019-09-05 13:07:06,600 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 132 transitions. [2019-09-05 13:07:06,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2019-09-05 13:07:06,601 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:07:06,601 INFO L399 BasicCegarLoop]: trace histogram [60, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:07:06,601 INFO L418 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:07:06,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:07:06,602 INFO L82 PathProgramCache]: Analyzing trace with hash -2066784889, now seen corresponding path program 16 times [2019-09-05 13:07:06,602 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:07:06,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:07:06,603 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:07:06,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:07:06,603 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:07:06,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:07:08,765 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:07:08,765 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:07:08,765 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:07:08,765 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:07:08,766 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:07:08,766 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:07:08,766 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 [2019-09-05 13:07:08,779 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:07:08,779 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-05 13:07:08,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:07:09,116 INFO L256 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 63 conjunts are in the unsatisfiable core [2019-09-05 13:07:09,118 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:07:09,355 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:07:09,355 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:07:14,557 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:07:14,561 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:07:14,561 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 127 [2019-09-05 13:07:14,561 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:07:14,562 INFO L454 AbstractCegarLoop]: Interpolant automaton has 67 states [2019-09-05 13:07:14,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2019-09-05 13:07:14,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5690, Invalid=10312, Unknown=0, NotChecked=0, Total=16002 [2019-09-05 13:07:14,563 INFO L87 Difference]: Start difference. First operand 132 states and 132 transitions. Second operand 67 states. [2019-09-05 13:07:14,796 WARN L188 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 180 DAG size of output: 8 [2019-09-05 13:07:14,946 WARN L188 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 8 [2019-09-05 13:07:15,119 WARN L188 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 189 DAG size of output: 9 [2019-09-05 13:07:15,288 WARN L188 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-05 13:07:15,471 WARN L188 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-05 13:07:15,645 WARN L188 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-05 13:07:15,843 WARN L188 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-05 13:07:16,026 WARN L188 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-05 13:07:16,207 WARN L188 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-05 13:07:16,396 WARN L188 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-05 13:07:16,594 WARN L188 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-05 13:07:16,777 WARN L188 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-05 13:07:16,967 WARN L188 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-05 13:07:17,150 WARN L188 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-05 13:07:17,338 WARN L188 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-05 13:07:17,522 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-05 13:07:17,710 WARN L188 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-05 13:07:18,091 WARN L188 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2019-09-05 13:07:24,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:07:24,796 INFO L93 Difference]: Finished difference Result 140 states and 140 transitions. [2019-09-05 13:07:24,800 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2019-09-05 13:07:24,800 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 131 [2019-09-05 13:07:24,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:07:24,802 INFO L225 Difference]: With dead ends: 140 [2019-09-05 13:07:24,802 INFO L226 Difference]: Without dead ends: 140 [2019-09-05 13:07:24,804 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 198 SyntacticMatches, 2 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2556 ImplicationChecksByTransitivity, 16.8s TimeCoverageRelationStatistics Valid=13451, Invalid=22459, Unknown=0, NotChecked=0, Total=35910 [2019-09-05 13:07:24,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2019-09-05 13:07:24,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 140. [2019-09-05 13:07:24,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2019-09-05 13:07:24,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 140 transitions. [2019-09-05 13:07:24,809 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 140 transitions. Word has length 131 [2019-09-05 13:07:24,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:07:24,810 INFO L475 AbstractCegarLoop]: Abstraction has 140 states and 140 transitions. [2019-09-05 13:07:24,810 INFO L476 AbstractCegarLoop]: Interpolant automaton has 67 states. [2019-09-05 13:07:24,810 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 140 transitions. [2019-09-05 13:07:24,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2019-09-05 13:07:24,811 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:07:24,811 INFO L399 BasicCegarLoop]: trace histogram [64, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:07:24,812 INFO L418 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:07:24,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:07:24,812 INFO L82 PathProgramCache]: Analyzing trace with hash 1595664255, now seen corresponding path program 17 times [2019-09-05 13:07:24,812 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:07:24,815 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:07:24,816 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:07:24,816 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:07:24,816 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:07:25,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:07:27,215 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 0 proven. 4096 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:07:27,215 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:07:27,215 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:07:27,215 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:07:27,216 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:07:27,216 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:07:27,216 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 [2019-09-05 13:07:27,230 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 13:07:27,230 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-05 13:07:27,325 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 65 check-sat command(s) [2019-09-05 13:07:27,325 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:07:27,328 INFO L256 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 67 conjunts are in the unsatisfiable core [2019-09-05 13:07:27,330 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:07:27,579 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 0 proven. 4096 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:07:27,580 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:07:33,267 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 0 proven. 4096 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:07:33,271 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:07:33,271 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 135 [2019-09-05 13:07:33,271 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:07:33,271 INFO L454 AbstractCegarLoop]: Interpolant automaton has 71 states [2019-09-05 13:07:33,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2019-09-05 13:07:33,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6452, Invalid=11638, Unknown=0, NotChecked=0, Total=18090 [2019-09-05 13:07:33,273 INFO L87 Difference]: Start difference. First operand 140 states and 140 transitions. Second operand 71 states. [2019-09-05 13:07:33,522 WARN L188 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 8 [2019-09-05 13:07:33,689 WARN L188 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 8 [2019-09-05 13:07:33,873 WARN L188 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 9 [2019-09-05 13:07:34,066 WARN L188 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-05 13:07:34,262 WARN L188 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-05 13:07:34,453 WARN L188 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-05 13:07:34,660 WARN L188 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-05 13:07:34,856 WARN L188 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-05 13:07:35,056 WARN L188 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-05 13:07:35,258 WARN L188 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-05 13:07:35,469 WARN L188 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-05 13:07:35,678 WARN L188 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-05 13:07:35,883 WARN L188 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-05 13:07:36,092 WARN L188 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-05 13:07:36,292 WARN L188 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-05 13:07:36,502 WARN L188 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-05 13:07:36,710 WARN L188 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-05 13:07:36,919 WARN L188 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-05 13:07:37,129 WARN L188 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-05 13:07:37,337 WARN L188 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-05 13:07:37,541 WARN L188 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-05 13:07:37,955 WARN L188 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2019-09-05 13:07:45,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:07:45,058 INFO L93 Difference]: Finished difference Result 148 states and 148 transitions. [2019-09-05 13:07:45,058 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2019-09-05 13:07:45,058 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 139 [2019-09-05 13:07:45,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:07:45,060 INFO L225 Difference]: With dead ends: 148 [2019-09-05 13:07:45,060 INFO L226 Difference]: Without dead ends: 148 [2019-09-05 13:07:45,061 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 [2019-09-05 13:07:45,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2019-09-05 13:07:45,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 148. [2019-09-05 13:07:45,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2019-09-05 13:07:45,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 148 transitions. [2019-09-05 13:07:45,065 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 148 transitions. Word has length 139 [2019-09-05 13:07:45,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:07:45,065 INFO L475 AbstractCegarLoop]: Abstraction has 148 states and 148 transitions. [2019-09-05 13:07:45,066 INFO L476 AbstractCegarLoop]: Interpolant automaton has 71 states. [2019-09-05 13:07:45,066 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 148 transitions. [2019-09-05 13:07:45,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2019-09-05 13:07:45,066 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:07:45,067 INFO L399 BasicCegarLoop]: trace histogram [68, 68, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:07:45,067 INFO L418 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:07:45,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:07:45,067 INFO L82 PathProgramCache]: Analyzing trace with hash 1864038775, now seen corresponding path program 18 times [2019-09-05 13:07:45,067 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:07:45,068 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:07:45,068 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:07:45,068 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:07:45,068 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:07:45,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:07:47,777 INFO L134 CoverageAnalysis]: Checked inductivity of 4624 backedges. 0 proven. 4624 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:07:47,778 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:07:47,778 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:07:47,778 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:07:47,778 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:07:47,778 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:07:47,778 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 [2019-09-05 13:07:47,789 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 13:07:47,789 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-05 13:07:47,876 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 13:07:47,876 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:07:47,904 INFO L256 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 71 conjunts are in the unsatisfiable core [2019-09-05 13:07:47,906 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:07:48,143 INFO L134 CoverageAnalysis]: Checked inductivity of 4624 backedges. 0 proven. 4624 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:07:48,143 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:07:54,570 INFO L134 CoverageAnalysis]: Checked inductivity of 4624 backedges. 0 proven. 4624 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:07:54,573 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:07:54,574 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 143 [2019-09-05 13:07:54,574 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:07:54,574 INFO L454 AbstractCegarLoop]: Interpolant automaton has 75 states [2019-09-05 13:07:54,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2019-09-05 13:07:54,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7262, Invalid=13044, Unknown=0, NotChecked=0, Total=20306 [2019-09-05 13:07:54,575 INFO L87 Difference]: Start difference. First operand 148 states and 148 transitions. Second operand 75 states. [2019-09-05 13:07:54,843 WARN L188 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 204 DAG size of output: 8 [2019-09-05 13:07:55,025 WARN L188 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 8 [2019-09-05 13:07:55,227 WARN L188 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 9 [2019-09-05 13:07:55,434 WARN L188 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-05 13:07:55,646 WARN L188 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-05 13:07:55,863 WARN L188 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-05 13:07:56,079 WARN L188 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-05 13:07:56,316 WARN L188 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-05 13:07:56,537 WARN L188 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-05 13:07:56,762 WARN L188 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-05 13:07:56,983 WARN L188 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-05 13:07:57,210 WARN L188 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-05 13:07:57,435 WARN L188 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-05 13:07:57,664 WARN L188 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-05 13:07:57,890 WARN L188 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-05 13:07:58,125 WARN L188 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-05 13:07:58,403 WARN L188 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-05 13:07:58,634 WARN L188 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-05 13:07:58,868 WARN L188 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-05 13:07:59,105 WARN L188 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-05 13:07:59,334 WARN L188 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-05 13:07:59,563 WARN L188 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-05 13:07:59,790 WARN L188 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-05 13:08:00,017 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-05 13:08:00,245 WARN L188 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-05 13:08:08,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:08:08,336 INFO L93 Difference]: Finished difference Result 156 states and 156 transitions. [2019-09-05 13:08:08,337 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2019-09-05 13:08:08,337 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 147 [2019-09-05 13:08:08,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:08:08,338 INFO L225 Difference]: With dead ends: 156 [2019-09-05 13:08:08,338 INFO L226 Difference]: Without dead ends: 156 [2019-09-05 13:08:08,339 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 [2019-09-05 13:08:08,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2019-09-05 13:08:08,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 156. [2019-09-05 13:08:08,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2019-09-05 13:08:08,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 156 transitions. [2019-09-05 13:08:08,343 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 156 transitions. Word has length 147 [2019-09-05 13:08:08,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:08:08,343 INFO L475 AbstractCegarLoop]: Abstraction has 156 states and 156 transitions. [2019-09-05 13:08:08,343 INFO L476 AbstractCegarLoop]: Interpolant automaton has 75 states. [2019-09-05 13:08:08,344 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 156 transitions. [2019-09-05 13:08:08,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2019-09-05 13:08:08,344 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:08:08,344 INFO L399 BasicCegarLoop]: trace histogram [72, 72, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:08:08,345 INFO L418 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:08:08,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:08:08,345 INFO L82 PathProgramCache]: Analyzing trace with hash 1036292975, now seen corresponding path program 19 times [2019-09-05 13:08:08,345 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:08:08,348 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:08:08,348 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:08:08,348 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:08:08,348 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:08:08,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:08:11,279 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 0 proven. 5184 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:08:11,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:08:11,280 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:08:11,280 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:08:11,280 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:08:11,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:08:11,280 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 [2019-09-05 13:08:11,291 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:08:11,291 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-05 13:08:11,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:08:11,862 INFO L256 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 75 conjunts are in the unsatisfiable core [2019-09-05 13:08:11,864 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:08:12,126 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 0 proven. 5184 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:08:12,127 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:08:19,256 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 0 proven. 5184 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:08:19,260 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:08:19,260 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 151 [2019-09-05 13:08:19,260 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:08:19,260 INFO L454 AbstractCegarLoop]: Interpolant automaton has 79 states [2019-09-05 13:08:19,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2019-09-05 13:08:19,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8120, Invalid=14530, Unknown=0, NotChecked=0, Total=22650 [2019-09-05 13:08:19,262 INFO L87 Difference]: Start difference. First operand 156 states and 156 transitions. Second operand 79 states. [2019-09-05 13:08:19,547 WARN L188 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 216 DAG size of output: 8 [2019-09-05 13:08:19,747 WARN L188 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 8 [2019-09-05 13:08:19,962 WARN L188 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 225 DAG size of output: 9 [2019-09-05 13:08:20,192 WARN L188 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-05 13:08:20,425 WARN L188 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-05 13:08:20,662 WARN L188 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-05 13:08:20,895 WARN L188 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-05 13:08:21,125 WARN L188 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-05 13:08:21,356 WARN L188 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-05 13:08:21,593 WARN L188 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-05 13:08:21,831 WARN L188 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-05 13:08:22,075 WARN L188 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-05 13:08:22,323 WARN L188 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-05 13:08:22,581 WARN L188 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-05 13:08:22,822 WARN L188 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-05 13:08:23,071 WARN L188 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-05 13:08:23,324 WARN L188 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-05 13:08:23,574 WARN L188 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-05 13:08:23,824 WARN L188 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-05 13:08:24,071 WARN L188 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-05 13:08:24,320 WARN L188 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-05 13:08:24,585 WARN L188 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-05 13:08:24,860 WARN L188 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-05 13:08:25,119 WARN L188 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-05 13:08:25,380 WARN L188 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-05 13:08:25,630 WARN L188 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-05 13:08:25,878 WARN L188 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-05 13:08:26,121 WARN L188 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-05 13:08:26,372 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-05 13:08:26,625 WARN L188 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-05 13:08:35,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:08:35,008 INFO L93 Difference]: Finished difference Result 164 states and 164 transitions. [2019-09-05 13:08:35,008 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2019-09-05 13:08:35,008 INFO L78 Accepts]: Start accepts. Automaton has 79 states. Word has length 155 [2019-09-05 13:08:35,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:08:35,010 INFO L225 Difference]: With dead ends: 164 [2019-09-05 13:08:35,010 INFO L226 Difference]: Without dead ends: 164 [2019-09-05 13:08:35,011 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 460 GetRequests, 234 SyntacticMatches, 2 SemanticMatches, 224 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3498 ImplicationChecksByTransitivity, 25.0s TimeCoverageRelationStatistics Valid=19157, Invalid=31693, Unknown=0, NotChecked=0, Total=50850 [2019-09-05 13:08:35,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2019-09-05 13:08:35,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 164. [2019-09-05 13:08:35,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2019-09-05 13:08:35,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 164 transitions. [2019-09-05 13:08:35,015 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 164 transitions. Word has length 155 [2019-09-05 13:08:35,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:08:35,016 INFO L475 AbstractCegarLoop]: Abstraction has 164 states and 164 transitions. [2019-09-05 13:08:35,016 INFO L476 AbstractCegarLoop]: Interpolant automaton has 79 states. [2019-09-05 13:08:35,016 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 164 transitions. [2019-09-05 13:08:35,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2019-09-05 13:08:35,017 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:08:35,017 INFO L399 BasicCegarLoop]: trace histogram [76, 76, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:08:35,017 INFO L418 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:08:35,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:08:35,018 INFO L82 PathProgramCache]: Analyzing trace with hash -602884761, now seen corresponding path program 20 times [2019-09-05 13:08:35,018 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:08:35,019 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:08:35,019 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:08:35,019 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:08:35,019 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:08:35,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:08:38,904 INFO L134 CoverageAnalysis]: Checked inductivity of 5776 backedges. 0 proven. 5776 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:08:38,905 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:08:38,905 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:08:38,905 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:08:38,905 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:08:38,905 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:08:38,906 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 [2019-09-05 13:08:38,941 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 13:08:38,942 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-05 13:08:39,049 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 77 check-sat command(s) [2019-09-05 13:08:39,049 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:08:39,053 INFO L256 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 79 conjunts are in the unsatisfiable core [2019-09-05 13:08:39,055 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:08:39,362 INFO L134 CoverageAnalysis]: Checked inductivity of 5776 backedges. 0 proven. 5776 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:08:39,362 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:08:47,229 INFO L134 CoverageAnalysis]: Checked inductivity of 5776 backedges. 0 proven. 5776 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:08:47,233 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:08:47,233 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80, 80] total 159 [2019-09-05 13:08:47,233 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:08:47,233 INFO L454 AbstractCegarLoop]: Interpolant automaton has 83 states [2019-09-05 13:08:47,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2019-09-05 13:08:47,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9026, Invalid=16096, Unknown=0, NotChecked=0, Total=25122 [2019-09-05 13:08:47,235 INFO L87 Difference]: Start difference. First operand 164 states and 164 transitions. Second operand 83 states. [2019-09-05 13:08:47,543 WARN L188 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 228 DAG size of output: 8 [2019-09-05 13:08:47,752 WARN L188 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 231 DAG size of output: 8 [2019-09-05 13:08:48,004 WARN L188 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 237 DAG size of output: 9 [2019-09-05 13:08:48,251 WARN L188 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-05 13:08:48,507 WARN L188 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-05 13:08:48,767 WARN L188 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-05 13:08:49,022 WARN L188 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-05 13:08:49,292 WARN L188 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-05 13:08:49,548 WARN L188 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-05 13:08:49,815 WARN L188 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-05 13:08:50,084 WARN L188 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-05 13:08:50,351 WARN L188 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-05 13:08:50,630 WARN L188 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-05 13:08:50,899 WARN L188 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-05 13:08:51,175 WARN L188 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-05 13:08:51,454 WARN L188 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-05 13:08:51,723 WARN L188 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-05 13:08:51,997 WARN L188 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-05 13:08:52,270 WARN L188 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-05 13:08:52,544 WARN L188 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-05 13:08:52,839 WARN L188 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-05 13:08:53,121 WARN L188 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-05 13:08:53,405 WARN L188 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-05 13:08:53,682 WARN L188 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-05 13:08:53,961 WARN L188 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-05 13:08:54,237 WARN L188 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-05 13:08:54,513 WARN L188 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-05 13:08:54,782 WARN L188 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-05 13:08:55,067 WARN L188 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-05 13:08:55,333 WARN L188 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-05 13:08:55,610 WARN L188 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-05 13:08:55,873 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-05 13:08:56,127 WARN L188 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-05 13:08:56,392 WARN L188 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-05 13:08:57,172 WARN L188 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 11 [2019-09-05 13:09:05,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:09:05,252 INFO L93 Difference]: Finished difference Result 172 states and 172 transitions. [2019-09-05 13:09:05,254 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2019-09-05 13:09:05,254 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 163 [2019-09-05 13:09:05,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:09:05,255 INFO L225 Difference]: With dead ends: 172 [2019-09-05 13:09:05,256 INFO L226 Difference]: Without dead ends: 172 [2019-09-05 13:09:05,257 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 246 SyntacticMatches, 2 SemanticMatches, 236 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3844 ImplicationChecksByTransitivity, 28.9s TimeCoverageRelationStatistics Valid=21283, Invalid=35123, Unknown=0, NotChecked=0, Total=56406 [2019-09-05 13:09:05,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2019-09-05 13:09:05,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 172. [2019-09-05 13:09:05,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2019-09-05 13:09:05,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 172 transitions. [2019-09-05 13:09:05,260 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 172 transitions. Word has length 163 [2019-09-05 13:09:05,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:09:05,262 INFO L475 AbstractCegarLoop]: Abstraction has 172 states and 172 transitions. [2019-09-05 13:09:05,262 INFO L476 AbstractCegarLoop]: Interpolant automaton has 83 states. [2019-09-05 13:09:05,262 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 172 transitions. [2019-09-05 13:09:05,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2019-09-05 13:09:05,264 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:09:05,264 INFO L399 BasicCegarLoop]: trace histogram [80, 80, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:09:05,264 INFO L418 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:09:05,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:09:05,265 INFO L82 PathProgramCache]: Analyzing trace with hash -487104673, now seen corresponding path program 21 times [2019-09-05 13:09:05,265 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:09:05,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:09:05,266 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:09:05,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:09:05,267 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:09:05,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:09:09,093 INFO L134 CoverageAnalysis]: Checked inductivity of 6400 backedges. 0 proven. 6400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:09:09,094 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:09:09,094 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:09:09,094 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:09:09,094 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:09:09,094 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:09:09,094 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 [2019-09-05 13:09:09,104 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 13:09:09,104 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-05 13:09:09,331 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 13:09:09,332 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:09:09,449 INFO L256 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 83 conjunts are in the unsatisfiable core [2019-09-05 13:09:09,451 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:09:09,752 INFO L134 CoverageAnalysis]: Checked inductivity of 6400 backedges. 0 proven. 6400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:09:09,752 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:09:18,441 INFO L134 CoverageAnalysis]: Checked inductivity of 6400 backedges. 0 proven. 6400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:09:18,444 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:09:18,445 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84, 84] total 167 [2019-09-05 13:09:18,445 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:09:18,445 INFO L454 AbstractCegarLoop]: Interpolant automaton has 87 states [2019-09-05 13:09:18,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2019-09-05 13:09:18,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9980, Invalid=17742, Unknown=0, NotChecked=0, Total=27722 [2019-09-05 13:09:18,447 INFO L87 Difference]: Start difference. First operand 172 states and 172 transitions. Second operand 87 states. [2019-09-05 13:09:18,789 WARN L188 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 240 DAG size of output: 8 [2019-09-05 13:09:19,025 WARN L188 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 243 DAG size of output: 8 [2019-09-05 13:09:19,293 WARN L188 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 249 DAG size of output: 9 [2019-09-05 13:09:19,577 WARN L188 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-05 13:09:19,854 WARN L188 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-05 13:09:20,128 WARN L188 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-05 13:09:20,404 WARN L188 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-05 13:09:20,690 WARN L188 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-05 13:09:20,971 WARN L188 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-05 13:09:21,284 WARN L188 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-05 13:09:21,580 WARN L188 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-05 13:09:21,863 WARN L188 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-05 13:09:22,148 WARN L188 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-05 13:09:22,441 WARN L188 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-05 13:09:22,733 WARN L188 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-05 13:09:23,037 WARN L188 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-05 13:09:23,333 WARN L188 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-05 13:09:23,621 WARN L188 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-05 13:09:23,916 WARN L188 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-05 13:09:24,218 WARN L188 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-05 13:09:24,522 WARN L188 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-05 13:09:24,829 WARN L188 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-05 13:09:25,138 WARN L188 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-05 13:09:25,440 WARN L188 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-05 13:09:25,750 WARN L188 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-05 13:09:26,048 WARN L188 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-05 13:09:26,343 WARN L188 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-05 13:09:26,656 WARN L188 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-05 13:09:26,958 WARN L188 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-05 13:09:27,253 WARN L188 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-05 13:09:27,562 WARN L188 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-05 13:09:27,854 WARN L188 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-05 13:09:28,135 WARN L188 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-05 13:09:28,423 WARN L188 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-05 13:09:28,708 WARN L188 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-05 13:09:28,989 WARN L188 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-05 13:09:29,263 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-05 13:09:29,549 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-05 13:09:38,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:09:38,935 INFO L93 Difference]: Finished difference Result 180 states and 180 transitions. [2019-09-05 13:09:38,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2019-09-05 13:09:38,936 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 171 [2019-09-05 13:09:38,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:09:38,937 INFO L225 Difference]: With dead ends: 180 [2019-09-05 13:09:38,937 INFO L226 Difference]: Without dead ends: 180 [2019-09-05 13:09:38,944 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 508 GetRequests, 258 SyntacticMatches, 2 SemanticMatches, 248 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4206 ImplicationChecksByTransitivity, 31.9s TimeCoverageRelationStatistics Valid=23521, Invalid=38729, Unknown=0, NotChecked=0, Total=62250 [2019-09-05 13:09:38,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2019-09-05 13:09:38,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 180. [2019-09-05 13:09:38,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2019-09-05 13:09:38,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 180 transitions. [2019-09-05 13:09:38,948 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 180 transitions. Word has length 171 [2019-09-05 13:09:38,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:09:38,948 INFO L475 AbstractCegarLoop]: Abstraction has 180 states and 180 transitions. [2019-09-05 13:09:38,948 INFO L476 AbstractCegarLoop]: Interpolant automaton has 87 states. [2019-09-05 13:09:38,948 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 180 transitions. [2019-09-05 13:09:38,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2019-09-05 13:09:38,949 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:09:38,949 INFO L399 BasicCegarLoop]: trace histogram [84, 84, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:09:38,949 INFO L418 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:09:38,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:09:38,950 INFO L82 PathProgramCache]: Analyzing trace with hash 1936757079, now seen corresponding path program 22 times [2019-09-05 13:09:38,950 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:09:38,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:09:38,950 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:09:38,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:09:38,951 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:09:39,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:09:43,330 INFO L134 CoverageAnalysis]: Checked inductivity of 7056 backedges. 0 proven. 7056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:09:43,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:09:43,331 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:09:43,331 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:09:43,331 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:09:43,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:09:43,331 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 [2019-09-05 13:09:43,343 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:09:43,343 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-05 13:09:43,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:09:44,187 INFO L256 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 87 conjunts are in the unsatisfiable core [2019-09-05 13:09:44,189 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:09:44,494 INFO L134 CoverageAnalysis]: Checked inductivity of 7056 backedges. 0 proven. 7056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:09:44,495 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:09:54,030 INFO L134 CoverageAnalysis]: Checked inductivity of 7056 backedges. 0 proven. 7056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:09:54,034 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:09:54,034 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88, 88] total 175 [2019-09-05 13:09:54,034 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:09:54,034 INFO L454 AbstractCegarLoop]: Interpolant automaton has 91 states [2019-09-05 13:09:54,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2019-09-05 13:09:54,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10982, Invalid=19468, Unknown=0, NotChecked=0, Total=30450 [2019-09-05 13:09:54,036 INFO L87 Difference]: Start difference. First operand 180 states and 180 transitions. Second operand 91 states. [2019-09-05 13:09:54,396 WARN L188 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 252 DAG size of output: 8 [2019-09-05 13:09:54,645 WARN L188 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 255 DAG size of output: 8 [2019-09-05 13:09:54,932 WARN L188 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 261 DAG size of output: 9 [2019-09-05 13:09:55,218 WARN L188 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-05 13:09:55,514 WARN L188 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-05 13:09:55,808 WARN L188 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-05 13:09:56,120 WARN L188 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-05 13:09:56,424 WARN L188 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-05 13:09:56,734 WARN L188 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-05 13:09:57,035 WARN L188 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-05 13:09:57,349 WARN L188 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-05 13:09:57,661 WARN L188 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-05 13:09:57,963 WARN L188 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-05 13:09:58,268 WARN L188 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-05 13:09:58,574 WARN L188 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-05 13:09:58,898 WARN L188 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-05 13:09:59,207 WARN L188 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-05 13:09:59,517 WARN L188 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-05 13:09:59,829 WARN L188 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-05 13:10:00,145 WARN L188 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-05 13:10:00,468 WARN L188 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-05 13:10:00,799 WARN L188 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-05 13:10:01,121 WARN L188 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-05 13:10:01,455 WARN L188 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-05 13:10:01,786 WARN L188 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-05 13:10:02,106 WARN L188 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-05 13:10:02,445 WARN L188 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-05 13:10:02,762 WARN L188 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-05 13:10:03,090 WARN L188 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-05 13:10:03,409 WARN L188 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-05 13:10:03,728 WARN L188 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-05 13:10:04,058 WARN L188 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-05 13:10:04,369 WARN L188 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-05 13:10:04,692 WARN L188 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-05 13:10:05,009 WARN L188 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-05 13:10:05,329 WARN L188 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-05 13:10:05,651 WARN L188 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-05 13:10:05,972 WARN L188 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-05 13:10:06,265 WARN L188 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-05 13:10:06,566 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-05 13:10:06,867 WARN L188 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-05 13:10:07,166 WARN L188 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-05 13:10:17,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:10:17,124 INFO L93 Difference]: Finished difference Result 188 states and 188 transitions. [2019-09-05 13:10:17,128 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2019-09-05 13:10:17,128 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 179 [2019-09-05 13:10:17,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:10:17,130 INFO L225 Difference]: With dead ends: 188 [2019-09-05 13:10:17,130 INFO L226 Difference]: Without dead ends: 188 [2019-09-05 13:10:17,132 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 532 GetRequests, 270 SyntacticMatches, 2 SemanticMatches, 260 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4584 ImplicationChecksByTransitivity, 35.4s TimeCoverageRelationStatistics Valid=25871, Invalid=42511, Unknown=0, NotChecked=0, Total=68382 [2019-09-05 13:10:17,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2019-09-05 13:10:17,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 188. [2019-09-05 13:10:17,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2019-09-05 13:10:17,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 188 transitions. [2019-09-05 13:10:17,136 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 188 transitions. Word has length 179 [2019-09-05 13:10:17,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:10:17,137 INFO L475 AbstractCegarLoop]: Abstraction has 188 states and 188 transitions. [2019-09-05 13:10:17,137 INFO L476 AbstractCegarLoop]: Interpolant automaton has 91 states. [2019-09-05 13:10:17,137 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 188 transitions. [2019-09-05 13:10:17,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2019-09-05 13:10:17,138 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:10:17,138 INFO L399 BasicCegarLoop]: trace histogram [88, 88, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:10:17,138 INFO L418 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:10:17,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:10:17,139 INFO L82 PathProgramCache]: Analyzing trace with hash 913591119, now seen corresponding path program 23 times [2019-09-05 13:10:17,139 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:10:17,139 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:10:17,139 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:10:17,140 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:10:17,140 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:10:17,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:10:21,446 INFO L134 CoverageAnalysis]: Checked inductivity of 7744 backedges. 0 proven. 7744 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:10:21,446 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:10:21,446 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:10:21,446 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:10:21,446 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:10:21,446 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:10:21,446 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 [2019-09-05 13:10:21,463 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 13:10:21,463 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-05 13:10:21,596 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 89 check-sat command(s) [2019-09-05 13:10:21,596 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:10:21,604 INFO L256 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 91 conjunts are in the unsatisfiable core [2019-09-05 13:10:21,607 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:10:21,945 INFO L134 CoverageAnalysis]: Checked inductivity of 7744 backedges. 0 proven. 7744 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:10:21,945 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:10:32,541 INFO L134 CoverageAnalysis]: Checked inductivity of 7744 backedges. 0 proven. 7744 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:10:32,545 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:10:32,545 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92, 92] total 183 [2019-09-05 13:10:32,545 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:10:32,546 INFO L454 AbstractCegarLoop]: Interpolant automaton has 95 states [2019-09-05 13:10:32,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2019-09-05 13:10:32,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12032, Invalid=21274, Unknown=0, NotChecked=0, Total=33306 [2019-09-05 13:10:32,548 INFO L87 Difference]: Start difference. First operand 188 states and 188 transitions. Second operand 95 states. [2019-09-05 13:10:32,935 WARN L188 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 264 DAG size of output: 8 [2019-09-05 13:10:33,227 WARN L188 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 267 DAG size of output: 8 [2019-09-05 13:10:33,530 WARN L188 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 273 DAG size of output: 9 [2019-09-05 13:10:33,840 WARN L188 SmtUtils]: Spent 278.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2019-09-05 13:10:34,156 WARN L188 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2019-09-05 13:10:34,489 WARN L188 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2019-09-05 13:10:34,805 WARN L188 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2019-09-05 13:10:35,134 WARN L188 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-05 13:10:35,462 WARN L188 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-05 13:10:35,800 WARN L188 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-05 13:10:36,146 WARN L188 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-05 13:10:36,483 WARN L188 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-05 13:10:36,830 WARN L188 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-05 13:10:37,167 WARN L188 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-05 13:10:37,515 WARN L188 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-05 13:10:37,852 WARN L188 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-05 13:10:38,184 WARN L188 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-05 13:10:38,532 WARN L188 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-05 13:10:38,870 WARN L188 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-05 13:10:39,225 WARN L188 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-05 13:10:39,564 WARN L188 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-05 13:10:39,900 WARN L188 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-05 13:10:40,236 WARN L188 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-05 13:10:40,587 WARN L188 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-05 13:10:40,929 WARN L188 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-05 13:10:41,282 WARN L188 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-05 13:10:41,635 WARN L188 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-05 13:10:41,975 WARN L188 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-05 13:10:42,315 WARN L188 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-05 13:10:42,657 WARN L188 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-05 13:10:42,999 WARN L188 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-05 13:10:43,357 WARN L188 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-05 13:10:43,692 WARN L188 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-05 13:10:44,029 WARN L188 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-05 13:10:44,376 WARN L188 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-05 13:10:44,710 WARN L188 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-05 13:10:45,048 WARN L188 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-05 13:10:45,377 WARN L188 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-05 13:10:45,719 WARN L188 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-05 13:10:46,056 WARN L188 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-05 13:10:46,386 WARN L188 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-05 13:10:46,715 WARN L188 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-05 13:10:47,038 WARN L188 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-05 13:10:47,357 WARN L188 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-05 13:10:47,686 WARN L188 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-05 13:10:48,008 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-05 13:10:48,647 WARN L188 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2019-09-05 13:10:58,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:10:58,668 INFO L93 Difference]: Finished difference Result 196 states and 196 transitions. [2019-09-05 13:10:58,668 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2019-09-05 13:10:58,669 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 187 [2019-09-05 13:10:58,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:10:58,670 INFO L225 Difference]: With dead ends: 196 [2019-09-05 13:10:58,670 INFO L226 Difference]: Without dead ends: 196 [2019-09-05 13:10:58,671 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 556 GetRequests, 282 SyntacticMatches, 2 SemanticMatches, 272 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4978 ImplicationChecksByTransitivity, 39.9s TimeCoverageRelationStatistics Valid=28333, Invalid=46469, Unknown=0, NotChecked=0, Total=74802 [2019-09-05 13:10:58,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2019-09-05 13:10:58,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2019-09-05 13:10:58,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2019-09-05 13:10:58,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 196 transitions. [2019-09-05 13:10:58,675 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 196 transitions. Word has length 187 [2019-09-05 13:10:58,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:10:58,676 INFO L475 AbstractCegarLoop]: Abstraction has 196 states and 196 transitions. [2019-09-05 13:10:58,676 INFO L476 AbstractCegarLoop]: Interpolant automaton has 95 states. [2019-09-05 13:10:58,676 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 196 transitions. [2019-09-05 13:10:58,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2019-09-05 13:10:58,677 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:10:58,677 INFO L399 BasicCegarLoop]: trace histogram [92, 92, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:10:58,677 INFO L418 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:10:58,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:10:58,678 INFO L82 PathProgramCache]: Analyzing trace with hash 1559924039, now seen corresponding path program 24 times [2019-09-05 13:10:58,678 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:10:58,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:10:58,679 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:10:58,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:10:58,679 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:10:59,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:11:03,736 INFO L134 CoverageAnalysis]: Checked inductivity of 8464 backedges. 0 proven. 8464 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:11:03,736 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:11:03,737 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:11:03,737 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:11:03,737 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:11:03,737 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:11:03,737 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 [2019-09-05 13:11:03,748 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 13:11:03,748 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-05 13:11:04,207 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 13:11:04,207 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:11:04,456 INFO L256 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 95 conjunts are in the unsatisfiable core [2019-09-05 13:11:04,460 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:11:05,025 INFO L134 CoverageAnalysis]: Checked inductivity of 8464 backedges. 0 proven. 8464 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:11:05,025 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:11:16,593 INFO L134 CoverageAnalysis]: Checked inductivity of 8464 backedges. 0 proven. 8464 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:11:16,597 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:11:16,597 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96, 96] total 191 [2019-09-05 13:11:16,597 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:11:16,598 INFO L454 AbstractCegarLoop]: Interpolant automaton has 99 states [2019-09-05 13:11:16,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2019-09-05 13:11:16,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13130, Invalid=23160, Unknown=0, NotChecked=0, Total=36290 [2019-09-05 13:11:16,599 INFO L87 Difference]: Start difference. First operand 196 states and 196 transitions. Second operand 99 states. [2019-09-05 13:11:17,011 WARN L188 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 276 DAG size of output: 8 [2019-09-05 13:11:17,299 WARN L188 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 279 DAG size of output: 8 [2019-09-05 13:11:17,630 WARN L188 SmtUtils]: Spent 305.00 ms on a formula simplification. DAG size of input: 285 DAG size of output: 9 [2019-09-05 13:11:17,957 WARN L188 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2019-09-05 13:11:18,310 WARN L188 SmtUtils]: Spent 306.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2019-09-05 13:11:18,647 WARN L188 SmtUtils]: Spent 284.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2019-09-05 13:11:18,989 WARN L188 SmtUtils]: Spent 278.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2019-09-05 13:11:19,331 WARN L188 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2019-09-05 13:11:19,671 WARN L188 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2019-09-05 13:11:20,032 WARN L188 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2019-09-05 13:11:20,385 WARN L188 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2019-09-05 13:11:20,737 WARN L188 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-05 13:11:21,092 WARN L188 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-05 13:11:21,465 WARN L188 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-05 13:11:21,822 WARN L188 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-05 13:11:22,176 WARN L188 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-05 13:11:22,538 WARN L188 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-05 13:11:22,905 WARN L188 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-05 13:11:23,277 WARN L188 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-05 13:11:23,650 WARN L188 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-05 13:11:24,023 WARN L188 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-05 13:11:24,394 WARN L188 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-05 13:11:24,758 WARN L188 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-05 13:11:25,136 WARN L188 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-05 13:11:25,534 WARN L188 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-05 13:11:25,910 WARN L188 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-05 13:11:26,276 WARN L188 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-05 13:11:26,648 WARN L188 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-05 13:11:27,010 WARN L188 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-05 13:11:27,383 WARN L188 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-05 13:11:27,888 WARN L188 SmtUtils]: Spent 313.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-05 13:11:28,260 WARN L188 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-05 13:11:28,627 WARN L188 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-05 13:11:28,994 WARN L188 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-05 13:11:29,358 WARN L188 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-05 13:11:29,726 WARN L188 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-05 13:11:30,097 WARN L188 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-05 13:11:30,463 WARN L188 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-05 13:11:30,835 WARN L188 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-05 13:11:31,202 WARN L188 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-05 13:11:31,572 WARN L188 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-05 13:11:31,934 WARN L188 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-05 13:11:32,291 WARN L188 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-05 13:11:32,653 WARN L188 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-05 13:11:33,020 WARN L188 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-05 13:11:33,377 WARN L188 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-05 13:11:33,725 WARN L188 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-05 13:11:34,072 WARN L188 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-05 13:11:34,405 WARN L188 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-05 13:11:34,754 WARN L188 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-05 13:11:35,093 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2019-09-05 13:11:35,430 WARN L188 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2019-09-05 13:11:45,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:11:45,698 INFO L93 Difference]: Finished difference Result 204 states and 204 transitions. [2019-09-05 13:11:45,698 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2019-09-05 13:11:45,699 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 195 [2019-09-05 13:11:45,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:11:45,700 INFO L225 Difference]: With dead ends: 204 [2019-09-05 13:11:45,700 INFO L226 Difference]: Without dead ends: 204 [2019-09-05 13:11:45,701 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 [2019-09-05 13:11:45,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2019-09-05 13:11:45,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 204. [2019-09-05 13:11:45,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2019-09-05 13:11:45,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 204 transitions. [2019-09-05 13:11:45,706 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 204 transitions. Word has length 195 [2019-09-05 13:11:45,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:11:45,706 INFO L475 AbstractCegarLoop]: Abstraction has 204 states and 204 transitions. [2019-09-05 13:11:45,706 INFO L476 AbstractCegarLoop]: Interpolant automaton has 99 states. [2019-09-05 13:11:45,706 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 204 transitions. [2019-09-05 13:11:45,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2019-09-05 13:11:45,707 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:11:45,708 INFO L399 BasicCegarLoop]: trace histogram [96, 96, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:11:45,708 INFO L418 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:11:45,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:11:45,708 INFO L82 PathProgramCache]: Analyzing trace with hash -1610918081, now seen corresponding path program 25 times [2019-09-05 13:11:45,708 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:11:45,709 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:11:45,709 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:11:45,709 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:11:45,709 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:11:46,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:11:50,682 INFO L134 CoverageAnalysis]: Checked inductivity of 9216 backedges. 0 proven. 9216 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:11:50,682 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:11:50,682 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:11:50,682 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:11:50,683 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:11:50,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:11:50,683 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 [2019-09-05 13:11:50,693 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:11:50,693 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-05 13:11:51,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:11:51,955 INFO L256 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 99 conjunts are in the unsatisfiable core [2019-09-05 13:11:51,957 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:11:52,459 INFO L134 CoverageAnalysis]: Checked inductivity of 9216 backedges. 0 proven. 9216 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:11:52,459 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:12:04,892 INFO L134 CoverageAnalysis]: Checked inductivity of 9216 backedges. 0 proven. 9216 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:12:04,895 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:12:04,895 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 100, 100] total 199 [2019-09-05 13:12:04,895 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:12:04,896 INFO L454 AbstractCegarLoop]: Interpolant automaton has 103 states [2019-09-05 13:12:04,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2019-09-05 13:12:04,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14276, Invalid=25126, Unknown=0, NotChecked=0, Total=39402 [2019-09-05 13:12:04,899 INFO L87 Difference]: Start difference. First operand 204 states and 204 transitions. Second operand 103 states. [2019-09-05 13:12:05,367 WARN L188 SmtUtils]: Spent 322.00 ms on a formula simplification. DAG size of input: 288 DAG size of output: 8 [2019-09-05 13:12:05,697 WARN L188 SmtUtils]: Spent 307.00 ms on a formula simplification. DAG size of input: 291 DAG size of output: 8 [2019-09-05 13:12:06,048 WARN L188 SmtUtils]: Spent 328.00 ms on a formula simplification. DAG size of input: 297 DAG size of output: 9 [2019-09-05 13:12:06,405 WARN L188 SmtUtils]: Spent 323.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2019-09-05 13:12:06,768 WARN L188 SmtUtils]: Spent 316.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2019-09-05 13:12:07,142 WARN L188 SmtUtils]: Spent 323.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2019-09-05 13:12:07,504 WARN L188 SmtUtils]: Spent 299.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2019-09-05 13:12:07,880 WARN L188 SmtUtils]: Spent 305.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2019-09-05 13:12:08,257 WARN L188 SmtUtils]: Spent 299.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2019-09-05 13:12:08,637 WARN L188 SmtUtils]: Spent 291.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2019-09-05 13:12:09,021 WARN L188 SmtUtils]: Spent 288.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2019-09-05 13:12:09,421 WARN L188 SmtUtils]: Spent 297.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2019-09-05 13:12:09,820 WARN L188 SmtUtils]: Spent 285.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2019-09-05 13:12:10,211 WARN L188 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2019-09-05 13:12:10,595 WARN L188 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2019-09-05 13:12:10,990 WARN L188 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-05 13:12:11,381 WARN L188 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-05 13:12:11,788 WARN L188 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-05 13:12:12,221 WARN L188 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-05 13:12:12,618 WARN L188 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-05 13:12:13,019 WARN L188 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-05 13:12:13,413 WARN L188 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-05 13:12:13,820 WARN L188 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-05 13:12:14,233 WARN L188 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-05 13:12:14,641 WARN L188 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-05 13:12:15,046 WARN L188 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-05 13:12:15,438 WARN L188 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-05 13:12:15,859 WARN L188 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-05 13:12:16,256 WARN L188 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-05 13:12:16,653 WARN L188 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-05 13:12:17,048 WARN L188 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-05 13:12:17,467 WARN L188 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-05 13:12:17,864 WARN L188 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-05 13:12:18,248 WARN L188 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-05 13:12:18,635 WARN L188 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-05 13:12:19,025 WARN L188 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-05 13:12:19,421 WARN L188 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-05 13:12:19,801 WARN L188 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-05 13:12:20,183 WARN L188 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-05 13:12:20,579 WARN L188 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-05 13:12:20,966 WARN L188 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-05 13:12:21,351 WARN L188 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-05 13:12:21,732 WARN L188 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-05 13:12:22,122 WARN L188 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-05 13:12:22,513 WARN L188 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-05 13:12:22,911 WARN L188 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-05 13:12:23,307 WARN L188 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-05 13:12:23,693 WARN L188 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-05 13:12:24,093 WARN L188 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-05 13:12:24,469 WARN L188 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-05 13:12:24,850 WARN L188 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-05 13:12:25,200 WARN L188 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-05 13:12:25,562 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-05 13:12:25,923 WARN L188 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-05 13:12:37,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:12:37,807 INFO L93 Difference]: Finished difference Result 212 states and 212 transitions. [2019-09-05 13:12:37,808 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2019-09-05 13:12:37,808 INFO L78 Accepts]: Start accepts. Automaton has 103 states. Word has length 203 [2019-09-05 13:12:37,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:12:37,809 INFO L225 Difference]: With dead ends: 212 [2019-09-05 13:12:37,809 INFO L226 Difference]: Without dead ends: 212 [2019-09-05 13:12:37,811 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 604 GetRequests, 306 SyntacticMatches, 2 SemanticMatches, 296 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5814 ImplicationChecksByTransitivity, 49.1s TimeCoverageRelationStatistics Valid=33593, Invalid=54913, Unknown=0, NotChecked=0, Total=88506 [2019-09-05 13:12:37,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2019-09-05 13:12:37,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 212. [2019-09-05 13:12:37,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 212 states. [2019-09-05 13:12:37,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 212 transitions. [2019-09-05 13:12:37,816 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 212 transitions. Word has length 203 [2019-09-05 13:12:37,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:12:37,817 INFO L475 AbstractCegarLoop]: Abstraction has 212 states and 212 transitions. [2019-09-05 13:12:37,817 INFO L476 AbstractCegarLoop]: Interpolant automaton has 103 states. [2019-09-05 13:12:37,817 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 212 transitions. [2019-09-05 13:12:37,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 212 [2019-09-05 13:12:37,818 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:12:37,818 INFO L399 BasicCegarLoop]: trace histogram [100, 100, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:12:37,819 INFO L418 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:12:37,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:12:37,819 INFO L82 PathProgramCache]: Analyzing trace with hash 1080994103, now seen corresponding path program 26 times [2019-09-05 13:12:37,819 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:12:37,820 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:12:37,820 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:12:37,820 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:12:37,820 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:12:38,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:12:43,333 INFO L134 CoverageAnalysis]: Checked inductivity of 10000 backedges. 0 proven. 10000 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:12:43,334 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:12:43,334 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:12:43,334 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:12:43,334 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:12:43,334 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:12:43,334 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 [2019-09-05 13:12:43,344 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 13:12:43,344 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-05 13:12:43,507 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 101 check-sat command(s) [2019-09-05 13:12:43,507 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:12:43,513 INFO L256 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 103 conjunts are in the unsatisfiable core [2019-09-05 13:12:43,516 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:12:43,862 INFO L134 CoverageAnalysis]: Checked inductivity of 10000 backedges. 0 proven. 10000 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:12:43,862 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:12:57,187 INFO L134 CoverageAnalysis]: Checked inductivity of 10000 backedges. 0 proven. 10000 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:12:57,190 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:12:57,191 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [104, 104, 104] total 207 [2019-09-05 13:12:57,191 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:12:57,191 INFO L454 AbstractCegarLoop]: Interpolant automaton has 107 states [2019-09-05 13:12:57,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2019-09-05 13:12:57,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15470, Invalid=27172, Unknown=0, NotChecked=0, Total=42642 [2019-09-05 13:12:57,193 INFO L87 Difference]: Start difference. First operand 212 states and 212 transitions. Second operand 107 states. [2019-09-05 13:12:57,636 WARN L188 SmtUtils]: Spent 309.00 ms on a formula simplification. DAG size of input: 300 DAG size of output: 8 [2019-09-05 13:12:57,998 WARN L188 SmtUtils]: Spent 340.00 ms on a formula simplification. DAG size of input: 303 DAG size of output: 8 [2019-09-05 13:12:58,374 WARN L188 SmtUtils]: Spent 350.00 ms on a formula simplification. DAG size of input: 309 DAG size of output: 9 [2019-09-05 13:12:58,752 WARN L188 SmtUtils]: Spent 340.00 ms on a formula simplification. DAG size of input: 308 DAG size of output: 11 [2019-09-05 13:12:59,139 WARN L188 SmtUtils]: Spent 341.00 ms on a formula simplification. DAG size of input: 305 DAG size of output: 11 [2019-09-05 13:12:59,531 WARN L188 SmtUtils]: Spent 336.00 ms on a formula simplification. DAG size of input: 302 DAG size of output: 11 [2019-09-05 13:12:59,916 WARN L188 SmtUtils]: Spent 324.00 ms on a formula simplification. DAG size of input: 299 DAG size of output: 11 [2019-09-05 13:13:00,311 WARN L188 SmtUtils]: Spent 325.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2019-09-05 13:13:00,732 WARN L188 SmtUtils]: Spent 339.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2019-09-05 13:13:01,139 WARN L188 SmtUtils]: Spent 315.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2019-09-05 13:13:01,553 WARN L188 SmtUtils]: Spent 312.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2019-09-05 13:13:01,954 WARN L188 SmtUtils]: Spent 295.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2019-09-05 13:13:02,361 WARN L188 SmtUtils]: Spent 293.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2019-09-05 13:13:02,776 WARN L188 SmtUtils]: Spent 293.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2019-09-05 13:13:03,195 WARN L188 SmtUtils]: Spent 285.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2019-09-05 13:13:03,630 WARN L188 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2019-09-05 13:13:04,047 WARN L188 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2019-09-05 13:13:04,464 WARN L188 SmtUtils]: Spent 271.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2019-09-05 13:13:04,887 WARN L188 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2019-09-05 13:13:05,308 WARN L188 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-05 13:13:05,743 WARN L188 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-05 13:13:06,181 WARN L188 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-05 13:13:06,617 WARN L188 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-05 13:13:07,065 WARN L188 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-05 13:13:07,490 WARN L188 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-05 13:13:07,916 WARN L188 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-05 13:13:08,344 WARN L188 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-05 13:13:08,782 WARN L188 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-05 13:13:09,204 WARN L188 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-05 13:13:09,628 WARN L188 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-05 13:13:10,039 WARN L188 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-05 13:13:10,474 WARN L188 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-05 13:13:10,894 WARN L188 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-05 13:13:11,318 WARN L188 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-05 13:13:11,743 WARN L188 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-05 13:13:12,170 WARN L188 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-05 13:13:12,596 WARN L188 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-05 13:13:13,013 WARN L188 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-05 13:13:13,425 WARN L188 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-05 13:13:13,848 WARN L188 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-05 13:13:14,272 WARN L188 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-05 13:13:14,695 WARN L188 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-05 13:13:15,110 WARN L188 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-05 13:13:15,518 WARN L188 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-05 13:13:15,943 WARN L188 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-05 13:13:16,375 WARN L188 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-05 13:13:16,803 WARN L188 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-05 13:13:17,224 WARN L188 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-05 13:13:17,641 WARN L188 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-05 13:13:18,045 WARN L188 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-05 13:13:18,448 WARN L188 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-05 13:13:18,846 WARN L188 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-05 13:13:19,265 WARN L188 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-05 13:13:19,679 WARN L188 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-05 13:13:20,053 WARN L188 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-05 13:13:20,455 WARN L188 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-05 13:13:20,829 WARN L188 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-05 13:13:21,203 WARN L188 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-05 13:13:33,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:13:33,224 INFO L93 Difference]: Finished difference Result 220 states and 220 transitions. [2019-09-05 13:13:33,225 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2019-09-05 13:13:33,225 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 211 [2019-09-05 13:13:33,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:13:33,226 INFO L225 Difference]: With dead ends: 220 [2019-09-05 13:13:33,226 INFO L226 Difference]: Without dead ends: 220 [2019-09-05 13:13:33,229 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 628 GetRequests, 318 SyntacticMatches, 2 SemanticMatches, 308 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6256 ImplicationChecksByTransitivity, 53.3s TimeCoverageRelationStatistics Valid=36391, Invalid=59399, Unknown=0, NotChecked=0, Total=95790 [2019-09-05 13:13:33,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2019-09-05 13:13:33,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 220. [2019-09-05 13:13:33,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2019-09-05 13:13:33,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 220 transitions. [2019-09-05 13:13:33,233 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 220 transitions. Word has length 211 [2019-09-05 13:13:33,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:13:33,234 INFO L475 AbstractCegarLoop]: Abstraction has 220 states and 220 transitions. [2019-09-05 13:13:33,234 INFO L476 AbstractCegarLoop]: Interpolant automaton has 107 states. [2019-09-05 13:13:33,234 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 220 transitions. [2019-09-05 13:13:33,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2019-09-05 13:13:33,235 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:13:33,235 INFO L399 BasicCegarLoop]: trace histogram [104, 104, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:13:33,236 INFO L418 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:13:33,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:13:33,236 INFO L82 PathProgramCache]: Analyzing trace with hash 122454831, now seen corresponding path program 27 times [2019-09-05 13:13:33,236 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:13:33,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:13:33,237 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:13:33,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:13:33,237 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:13:34,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:13:39,161 INFO L134 CoverageAnalysis]: Checked inductivity of 10816 backedges. 0 proven. 10816 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:13:39,162 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:13:39,162 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:13:39,162 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:13:39,162 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:13:39,162 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:13:39,162 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 [2019-09-05 13:13:39,188 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 13:13:39,188 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-05 13:13:40,295 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 13:13:40,295 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:13:41,110 INFO L256 TraceCheckSpWp]: Trace formula consists of 340 conjuncts, 107 conjunts are in the unsatisfiable core [2019-09-05 13:13:41,112 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:13:41,492 INFO L134 CoverageAnalysis]: Checked inductivity of 10816 backedges. 0 proven. 10816 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:13:41,493 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:13:55,954 INFO L134 CoverageAnalysis]: Checked inductivity of 10816 backedges. 0 proven. 10816 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:13:55,974 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:13:55,974 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [108, 108, 108] total 215 [2019-09-05 13:13:55,975 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:13:55,975 INFO L454 AbstractCegarLoop]: Interpolant automaton has 111 states [2019-09-05 13:13:55,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2019-09-05 13:13:55,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16712, Invalid=29298, Unknown=0, NotChecked=0, Total=46010 [2019-09-05 13:13:55,977 INFO L87 Difference]: Start difference. First operand 220 states and 220 transitions. Second operand 111 states. [2019-09-05 13:13:56,479 WARN L188 SmtUtils]: Spent 341.00 ms on a formula simplification. DAG size of input: 312 DAG size of output: 8 [2019-09-05 13:13:56,852 WARN L188 SmtUtils]: Spent 351.00 ms on a formula simplification. DAG size of input: 315 DAG size of output: 8 [2019-09-05 13:13:57,256 WARN L188 SmtUtils]: Spent 371.00 ms on a formula simplification. DAG size of input: 321 DAG size of output: 9 [2019-09-05 13:13:57,668 WARN L188 SmtUtils]: Spent 373.00 ms on a formula simplification. DAG size of input: 320 DAG size of output: 11 [2019-09-05 13:13:58,083 WARN L188 SmtUtils]: Spent 367.00 ms on a formula simplification. DAG size of input: 317 DAG size of output: 11 [2019-09-05 13:13:58,491 WARN L188 SmtUtils]: Spent 355.00 ms on a formula simplification. DAG size of input: 314 DAG size of output: 11 [2019-09-05 13:13:58,915 WARN L188 SmtUtils]: Spent 353.00 ms on a formula simplification. DAG size of input: 311 DAG size of output: 11 [2019-09-05 13:13:59,365 WARN L188 SmtUtils]: Spent 368.00 ms on a formula simplification. DAG size of input: 308 DAG size of output: 11 [2019-09-05 13:13:59,791 WARN L188 SmtUtils]: Spent 344.00 ms on a formula simplification. DAG size of input: 305 DAG size of output: 11 [2019-09-05 13:14:00,225 WARN L188 SmtUtils]: Spent 337.00 ms on a formula simplification. DAG size of input: 302 DAG size of output: 11 [2019-09-05 13:14:00,678 WARN L188 SmtUtils]: Spent 339.00 ms on a formula simplification. DAG size of input: 299 DAG size of output: 11 [2019-09-05 13:14:01,139 WARN L188 SmtUtils]: Spent 331.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2019-09-05 13:14:01,595 WARN L188 SmtUtils]: Spent 323.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2019-09-05 13:14:02,040 WARN L188 SmtUtils]: Spent 315.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2019-09-05 13:14:02,485 WARN L188 SmtUtils]: Spent 307.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2019-09-05 13:14:02,963 WARN L188 SmtUtils]: Spent 330.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2019-09-05 13:14:03,406 WARN L188 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2019-09-05 13:14:03,863 WARN L188 SmtUtils]: Spent 299.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2019-09-05 13:14:04,311 WARN L188 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2019-09-05 13:14:04,780 WARN L188 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2019-09-05 13:14:05,234 WARN L188 SmtUtils]: Spent 271.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2019-09-05 13:14:05,697 WARN L188 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2019-09-05 13:14:06,160 WARN L188 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2019-09-05 13:14:06,637 WARN L188 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-05 13:14:07,118 WARN L188 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-05 13:14:07,584 WARN L188 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-05 13:14:08,045 WARN L188 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-05 13:14:08,521 WARN L188 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-05 13:14:08,983 WARN L188 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-05 13:14:09,442 WARN L188 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-05 13:14:09,896 WARN L188 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-05 13:14:10,355 WARN L188 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-05 13:14:10,816 WARN L188 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-05 13:14:11,275 WARN L188 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-05 13:14:11,745 WARN L188 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-05 13:14:12,204 WARN L188 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-05 13:14:12,654 WARN L188 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-05 13:14:13,119 WARN L188 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-05 13:14:13,561 WARN L188 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-05 13:14:13,996 WARN L188 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-05 13:14:14,456 WARN L188 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-05 13:14:14,896 WARN L188 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-05 13:14:15,332 WARN L188 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-05 13:14:15,767 WARN L188 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-05 13:14:16,226 WARN L188 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-05 13:14:16,782 WARN L188 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-05 13:14:17,227 WARN L188 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-05 13:14:17,673 WARN L188 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-05 13:14:18,111 WARN L188 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-05 13:14:18,551 WARN L188 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-05 13:14:18,996 WARN L188 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-05 13:14:19,451 WARN L188 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-05 13:14:19,898 WARN L188 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-05 13:14:20,329 WARN L188 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-05 13:14:20,784 WARN L188 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-05 13:14:21,201 WARN L188 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-05 13:14:21,638 WARN L188 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-05 13:14:22,071 WARN L188 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-05 13:14:22,507 WARN L188 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-05 13:14:22,959 WARN L188 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-05 13:14:23,374 WARN L188 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-05 13:14:23,769 WARN L188 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-05 13:14:36,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:14:36,329 INFO L93 Difference]: Finished difference Result 228 states and 228 transitions. [2019-09-05 13:14:36,329 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2019-09-05 13:14:36,329 INFO L78 Accepts]: Start accepts. Automaton has 111 states. Word has length 219 [2019-09-05 13:14:36,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:14:36,331 INFO L225 Difference]: With dead ends: 228 [2019-09-05 13:14:36,331 INFO L226 Difference]: Without dead ends: 228 [2019-09-05 13:14:36,335 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 652 GetRequests, 330 SyntacticMatches, 2 SemanticMatches, 320 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6714 ImplicationChecksByTransitivity, 59.1s TimeCoverageRelationStatistics Valid=39301, Invalid=64061, Unknown=0, NotChecked=0, Total=103362 [2019-09-05 13:14:36,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2019-09-05 13:14:36,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 228. [2019-09-05 13:14:36,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 228 states. [2019-09-05 13:14:36,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 228 transitions. [2019-09-05 13:14:36,339 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 228 transitions. Word has length 219 [2019-09-05 13:14:36,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:14:36,339 INFO L475 AbstractCegarLoop]: Abstraction has 228 states and 228 transitions. [2019-09-05 13:14:36,340 INFO L476 AbstractCegarLoop]: Interpolant automaton has 111 states. [2019-09-05 13:14:36,340 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 228 transitions. [2019-09-05 13:14:36,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2019-09-05 13:14:36,341 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:14:36,341 INFO L399 BasicCegarLoop]: trace histogram [108, 108, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:14:36,341 INFO L418 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:14:36,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:14:36,342 INFO L82 PathProgramCache]: Analyzing trace with hash 1166861607, now seen corresponding path program 28 times [2019-09-05 13:14:36,342 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:14:36,342 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:14:36,342 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:14:36,343 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:14:36,343 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:14:37,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:14:42,758 INFO L134 CoverageAnalysis]: Checked inductivity of 11664 backedges. 0 proven. 11664 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:14:42,758 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:14:42,758 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:14:42,758 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:14:42,759 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:14:42,759 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:14:42,759 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 [2019-09-05 13:14:42,768 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:14:42,769 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-05 13:14:43,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:14:44,503 INFO L256 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 111 conjunts are in the unsatisfiable core [2019-09-05 13:14:44,507 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:14:44,930 INFO L134 CoverageAnalysis]: Checked inductivity of 11664 backedges. 0 proven. 11664 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:14:44,930 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:15:00,404 INFO L134 CoverageAnalysis]: Checked inductivity of 11664 backedges. 0 proven. 11664 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:15:00,408 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:15:00,408 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [112, 112, 112] total 223 [2019-09-05 13:15:00,408 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:15:00,409 INFO L454 AbstractCegarLoop]: Interpolant automaton has 115 states [2019-09-05 13:15:00,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2019-09-05 13:15:00,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18002, Invalid=31504, Unknown=0, NotChecked=0, Total=49506 [2019-09-05 13:15:00,411 INFO L87 Difference]: Start difference. First operand 228 states and 228 transitions. Second operand 115 states. [2019-09-05 13:15:00,954 WARN L188 SmtUtils]: Spent 381.00 ms on a formula simplification. DAG size of input: 324 DAG size of output: 8 [2019-09-05 13:15:01,328 WARN L188 SmtUtils]: Spent 350.00 ms on a formula simplification. DAG size of input: 327 DAG size of output: 8 [2019-09-05 13:15:01,737 WARN L188 SmtUtils]: Spent 383.00 ms on a formula simplification. DAG size of input: 333 DAG size of output: 9 [2019-09-05 13:15:02,155 WARN L188 SmtUtils]: Spent 367.00 ms on a formula simplification. DAG size of input: 332 DAG size of output: 11 [2019-09-05 13:15:02,569 WARN L188 SmtUtils]: Spent 367.00 ms on a formula simplification. DAG size of input: 329 DAG size of output: 11 [2019-09-05 13:15:03,006 WARN L188 SmtUtils]: Spent 377.00 ms on a formula simplification. DAG size of input: 326 DAG size of output: 11 [2019-09-05 13:15:03,454 WARN L188 SmtUtils]: Spent 362.00 ms on a formula simplification. DAG size of input: 323 DAG size of output: 11 [2019-09-05 13:15:03,909 WARN L188 SmtUtils]: Spent 373.00 ms on a formula simplification. DAG size of input: 320 DAG size of output: 11 [2019-09-05 13:15:04,356 WARN L188 SmtUtils]: Spent 362.00 ms on a formula simplification. DAG size of input: 317 DAG size of output: 11 [2019-09-05 13:15:04,838 WARN L188 SmtUtils]: Spent 376.00 ms on a formula simplification. DAG size of input: 314 DAG size of output: 11 [2019-09-05 13:15:05,297 WARN L188 SmtUtils]: Spent 351.00 ms on a formula simplification. DAG size of input: 311 DAG size of output: 11 [2019-09-05 13:15:05,763 WARN L188 SmtUtils]: Spent 354.00 ms on a formula simplification. DAG size of input: 308 DAG size of output: 11 [2019-09-05 13:15:06,217 WARN L188 SmtUtils]: Spent 333.00 ms on a formula simplification. DAG size of input: 305 DAG size of output: 11 [2019-09-05 13:15:06,668 WARN L188 SmtUtils]: Spent 323.00 ms on a formula simplification. DAG size of input: 302 DAG size of output: 11 [2019-09-05 13:15:07,125 WARN L188 SmtUtils]: Spent 318.00 ms on a formula simplification. DAG size of input: 299 DAG size of output: 11 [2019-09-05 13:15:07,588 WARN L188 SmtUtils]: Spent 317.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2019-09-05 13:15:08,061 WARN L188 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2019-09-05 13:15:08,526 WARN L188 SmtUtils]: Spent 302.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2019-09-05 13:15:09,018 WARN L188 SmtUtils]: Spent 316.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2019-09-05 13:15:09,503 WARN L188 SmtUtils]: Spent 302.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2019-09-05 13:15:09,983 WARN L188 SmtUtils]: Spent 296.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2019-09-05 13:15:10,460 WARN L188 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2019-09-05 13:15:10,943 WARN L188 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2019-09-05 13:15:11,436 WARN L188 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2019-09-05 13:15:11,926 WARN L188 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2019-09-05 13:15:12,429 WARN L188 SmtUtils]: Spent 271.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2019-09-05 13:15:12,949 WARN L188 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2019-09-05 13:15:13,444 WARN L188 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-05 13:15:13,936 WARN L188 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-05 13:15:14,455 WARN L188 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-05 13:15:14,952 WARN L188 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-05 13:15:15,456 WARN L188 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-05 13:15:15,936 WARN L188 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-05 13:15:16,405 WARN L188 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-05 13:15:16,900 WARN L188 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-05 13:15:17,388 WARN L188 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-05 13:15:17,874 WARN L188 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-05 13:15:18,354 WARN L188 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-05 13:15:18,851 WARN L188 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-05 13:15:19,321 WARN L188 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-05 13:15:19,806 WARN L188 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-05 13:15:20,301 WARN L188 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-05 13:15:20,775 WARN L188 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-05 13:15:21,241 WARN L188 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-05 13:15:21,728 WARN L188 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-05 13:15:22,207 WARN L188 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-05 13:15:22,700 WARN L188 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-05 13:15:23,190 WARN L188 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-05 13:15:23,664 WARN L188 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-05 13:15:24,138 WARN L188 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-05 13:15:24,603 WARN L188 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-05 13:15:25,099 WARN L188 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-05 13:15:25,582 WARN L188 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-05 13:15:26,044 WARN L188 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-05 13:15:26,495 WARN L188 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-05 13:15:26,990 WARN L188 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-05 13:15:27,461 WARN L188 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-05 13:15:27,914 WARN L188 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-05 13:15:28,398 WARN L188 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-05 13:15:28,864 WARN L188 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-05 13:15:29,336 WARN L188 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-05 13:15:29,787 WARN L188 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-05 13:15:30,235 WARN L188 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-05 13:15:30,658 WARN L188 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-05 13:15:31,101 WARN L188 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-05 13:15:31,527 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-05 13:15:46,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:15:46,839 INFO L93 Difference]: Finished difference Result 236 states and 236 transitions. [2019-09-05 13:15:46,840 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2019-09-05 13:15:46,840 INFO L78 Accepts]: Start accepts. Automaton has 115 states. Word has length 227 [2019-09-05 13:15:46,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:15:46,842 INFO L225 Difference]: With dead ends: 236 [2019-09-05 13:15:46,842 INFO L226 Difference]: Without dead ends: 236 [2019-09-05 13:15:46,845 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 676 GetRequests, 342 SyntacticMatches, 2 SemanticMatches, 332 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7188 ImplicationChecksByTransitivity, 66.6s TimeCoverageRelationStatistics Valid=42323, Invalid=68898, Unknown=1, NotChecked=0, Total=111222 [2019-09-05 13:15:46,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2019-09-05 13:15:46,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 236. [2019-09-05 13:15:46,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 236 states. [2019-09-05 13:15:46,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 236 transitions. [2019-09-05 13:15:46,851 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 236 transitions. Word has length 227 [2019-09-05 13:15:46,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:15:46,851 INFO L475 AbstractCegarLoop]: Abstraction has 236 states and 236 transitions. [2019-09-05 13:15:46,851 INFO L476 AbstractCegarLoop]: Interpolant automaton has 115 states. [2019-09-05 13:15:46,851 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 236 transitions. [2019-09-05 13:15:46,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 236 [2019-09-05 13:15:46,853 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:15:46,853 INFO L399 BasicCegarLoop]: trace histogram [112, 112, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:15:46,853 INFO L418 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:15:46,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:15:46,853 INFO L82 PathProgramCache]: Analyzing trace with hash -735588577, now seen corresponding path program 29 times [2019-09-05 13:15:46,854 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:15:46,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:15:46,854 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:15:46,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:15:46,854 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:15:47,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:15:53,923 INFO L134 CoverageAnalysis]: Checked inductivity of 12544 backedges. 0 proven. 12544 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:15:53,923 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:15:53,924 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:15:53,924 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:15:53,924 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:15:53,924 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:15:53,924 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 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 [2019-09-05 13:15:53,935 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 13:15:53,935 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-05 13:15:54,119 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 113 check-sat command(s) [2019-09-05 13:15:54,119 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:15:54,127 INFO L256 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 115 conjunts are in the unsatisfiable core [2019-09-05 13:15:54,130 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:15:54,636 INFO L134 CoverageAnalysis]: Checked inductivity of 12544 backedges. 0 proven. 12544 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:15:54,637 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:16:11,192 INFO L134 CoverageAnalysis]: Checked inductivity of 12544 backedges. 0 proven. 12544 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:16:11,196 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:16:11,196 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [116, 116, 116] total 231 [2019-09-05 13:16:11,196 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:16:11,196 INFO L454 AbstractCegarLoop]: Interpolant automaton has 119 states [2019-09-05 13:16:11,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2019-09-05 13:16:11,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19340, Invalid=33790, Unknown=0, NotChecked=0, Total=53130 [2019-09-05 13:16:11,199 INFO L87 Difference]: Start difference. First operand 236 states and 236 transitions. Second operand 119 states. [2019-09-05 13:16:11,756 WARN L188 SmtUtils]: Spent 388.00 ms on a formula simplification. DAG size of input: 336 DAG size of output: 8 [2019-09-05 13:16:12,174 WARN L188 SmtUtils]: Spent 394.00 ms on a formula simplification. DAG size of input: 339 DAG size of output: 8 [2019-09-05 13:16:12,631 WARN L188 SmtUtils]: Spent 427.00 ms on a formula simplification. DAG size of input: 345 DAG size of output: 9 [2019-09-05 13:16:13,091 WARN L188 SmtUtils]: Spent 416.00 ms on a formula simplification. DAG size of input: 344 DAG size of output: 11 [2019-09-05 13:16:13,551 WARN L188 SmtUtils]: Spent 412.00 ms on a formula simplification. DAG size of input: 341 DAG size of output: 11 [2019-09-05 13:16:14,034 WARN L188 SmtUtils]: Spent 424.00 ms on a formula simplification. DAG size of input: 338 DAG size of output: 11 [2019-09-05 13:16:14,499 WARN L188 SmtUtils]: Spent 396.00 ms on a formula simplification. DAG size of input: 335 DAG size of output: 11 [2019-09-05 13:16:14,981 WARN L188 SmtUtils]: Spent 402.00 ms on a formula simplification. DAG size of input: 332 DAG size of output: 11 [2019-09-05 13:16:15,461 WARN L188 SmtUtils]: Spent 394.00 ms on a formula simplification. DAG size of input: 329 DAG size of output: 11 [2019-09-05 13:16:15,940 WARN L188 SmtUtils]: Spent 381.00 ms on a formula simplification. DAG size of input: 326 DAG size of output: 11 [2019-09-05 13:16:16,432 WARN L188 SmtUtils]: Spent 375.00 ms on a formula simplification. DAG size of input: 323 DAG size of output: 11 [2019-09-05 13:16:16,922 WARN L188 SmtUtils]: Spent 371.00 ms on a formula simplification. DAG size of input: 320 DAG size of output: 11 [2019-09-05 13:16:17,424 WARN L188 SmtUtils]: Spent 370.00 ms on a formula simplification. DAG size of input: 317 DAG size of output: 11 [2019-09-05 13:16:17,925 WARN L188 SmtUtils]: Spent 364.00 ms on a formula simplification. DAG size of input: 314 DAG size of output: 11 [2019-09-05 13:16:18,424 WARN L188 SmtUtils]: Spent 353.00 ms on a formula simplification. DAG size of input: 311 DAG size of output: 11 [2019-09-05 13:16:18,953 WARN L188 SmtUtils]: Spent 376.00 ms on a formula simplification. DAG size of input: 308 DAG size of output: 11 [2019-09-05 13:16:19,471 WARN L188 SmtUtils]: Spent 341.00 ms on a formula simplification. DAG size of input: 305 DAG size of output: 11 [2019-09-05 13:16:19,997 WARN L188 SmtUtils]: Spent 341.00 ms on a formula simplification. DAG size of input: 302 DAG size of output: 11 [2019-09-05 13:16:20,524 WARN L188 SmtUtils]: Spent 334.00 ms on a formula simplification. DAG size of input: 299 DAG size of output: 11 [2019-09-05 13:16:21,047 WARN L188 SmtUtils]: Spent 326.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2019-09-05 13:16:21,562 WARN L188 SmtUtils]: Spent 321.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2019-09-05 13:16:22,089 WARN L188 SmtUtils]: Spent 321.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2019-09-05 13:16:22,610 WARN L188 SmtUtils]: Spent 308.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2019-09-05 13:16:23,139 WARN L188 SmtUtils]: Spent 308.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2019-09-05 13:16:23,667 WARN L188 SmtUtils]: Spent 303.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2019-09-05 13:16:24,213 WARN L188 SmtUtils]: Spent 313.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2019-09-05 13:16:24,736 WARN L188 SmtUtils]: Spent 285.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2019-09-05 13:16:25,257 WARN L188 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2019-09-05 13:16:25,779 WARN L188 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2019-09-05 13:16:26,301 WARN L188 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2019-09-05 13:16:26,829 WARN L188 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2019-09-05 13:16:27,350 WARN L188 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-05 13:16:27,865 WARN L188 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-05 13:16:28,387 WARN L188 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-05 13:16:28,941 WARN L188 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-05 13:16:29,466 WARN L188 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-05 13:16:29,998 WARN L188 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-05 13:16:30,524 WARN L188 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-05 13:16:31,069 WARN L188 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-05 13:16:31,607 WARN L188 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-05 13:16:32,128 WARN L188 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-05 13:16:32,620 WARN L188 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-05 13:16:33,103 WARN L188 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-05 13:16:33,606 WARN L188 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-05 13:16:34,126 WARN L188 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-05 13:16:34,636 WARN L188 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-05 13:16:35,160 WARN L188 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-05 13:16:35,649 WARN L188 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-05 13:16:36,141 WARN L188 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-05 13:16:36,641 WARN L188 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-05 13:16:37,142 WARN L188 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-05 13:16:37,638 WARN L188 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-05 13:16:38,145 WARN L188 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-05 13:16:38,651 WARN L188 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-05 13:16:39,129 WARN L188 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-05 13:16:39,609 WARN L188 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-05 13:16:40,097 WARN L188 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-05 13:16:40,604 WARN L188 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-05 13:16:41,104 WARN L188 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-05 13:16:41,594 WARN L188 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-05 13:16:42,077 WARN L188 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-05 13:16:42,570 WARN L188 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-05 13:16:43,056 WARN L188 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-05 13:16:43,549 WARN L188 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-05 13:16:44,045 WARN L188 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-05 13:16:44,523 WARN L188 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-05 13:16:44,991 WARN L188 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-05 13:16:45,454 WARN L188 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-05 13:16:45,902 WARN L188 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-05 13:16:46,345 WARN L188 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-05 13:16:46,780 WARN L188 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2019-09-05 13:16:48,078 WARN L188 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 11 [2019-09-05 13:16:59,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:16:59,826 INFO L93 Difference]: Finished difference Result 244 states and 244 transitions. [2019-09-05 13:16:59,830 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2019-09-05 13:16:59,831 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 235 [2019-09-05 13:16:59,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:16:59,832 INFO L225 Difference]: With dead ends: 244 [2019-09-05 13:16:59,832 INFO L226 Difference]: Without dead ends: 244 [2019-09-05 13:16:59,836 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 [2019-09-05 13:16:59,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2019-09-05 13:16:59,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 244. [2019-09-05 13:16:59,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2019-09-05 13:16:59,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 244 transitions. [2019-09-05 13:16:59,840 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 244 transitions. Word has length 235 [2019-09-05 13:16:59,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:16:59,841 INFO L475 AbstractCegarLoop]: Abstraction has 244 states and 244 transitions. [2019-09-05 13:16:59,841 INFO L476 AbstractCegarLoop]: Interpolant automaton has 119 states. [2019-09-05 13:16:59,841 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 244 transitions. [2019-09-05 13:16:59,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2019-09-05 13:16:59,842 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:16:59,843 INFO L399 BasicCegarLoop]: trace histogram [116, 116, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:16:59,843 INFO L418 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:16:59,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:16:59,843 INFO L82 PathProgramCache]: Analyzing trace with hash 336937239, now seen corresponding path program 30 times [2019-09-05 13:16:59,843 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:16:59,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:16:59,844 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:16:59,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:16:59,845 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:17:01,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:17:07,666 INFO L134 CoverageAnalysis]: Checked inductivity of 13456 backedges. 0 proven. 13456 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:17:07,666 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:17:07,667 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:17:07,667 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:17:07,667 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:17:07,667 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:17:07,667 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 [2019-09-05 13:17:07,676 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 13:17:07,677 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-05 13:17:09,147 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 13:17:09,147 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:17:10,278 INFO L256 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 119 conjunts are in the unsatisfiable core [2019-09-05 13:17:10,281 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:17:10,830 INFO L134 CoverageAnalysis]: Checked inductivity of 13456 backedges. 0 proven. 13456 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:17:10,831 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:17:28,590 INFO L134 CoverageAnalysis]: Checked inductivity of 13456 backedges. 0 proven. 13456 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:17:28,594 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-05 13:17:28,594 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [120, 120, 120] total 239 [2019-09-05 13:17:28,594 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:17:28,595 INFO L454 AbstractCegarLoop]: Interpolant automaton has 123 states [2019-09-05 13:17:28,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2019-09-05 13:17:28,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20726, Invalid=36156, Unknown=0, NotChecked=0, Total=56882 [2019-09-05 13:17:28,596 INFO L87 Difference]: Start difference. First operand 244 states and 244 transitions. Second operand 123 states. [2019-09-05 13:17:29,185 WARN L188 SmtUtils]: Spent 413.00 ms on a formula simplification. DAG size of input: 348 DAG size of output: 8 [2019-09-05 13:17:29,631 WARN L188 SmtUtils]: Spent 423.00 ms on a formula simplification. DAG size of input: 351 DAG size of output: 8 [2019-09-05 13:17:30,104 WARN L188 SmtUtils]: Spent 443.00 ms on a formula simplification. DAG size of input: 357 DAG size of output: 9 [2019-09-05 13:17:30,585 WARN L188 SmtUtils]: Spent 440.00 ms on a formula simplification. DAG size of input: 356 DAG size of output: 11 [2019-09-05 13:17:31,078 WARN L188 SmtUtils]: Spent 442.00 ms on a formula simplification. DAG size of input: 353 DAG size of output: 11 [2019-09-05 13:17:31,577 WARN L188 SmtUtils]: Spent 436.00 ms on a formula simplification. DAG size of input: 350 DAG size of output: 11 [2019-09-05 13:17:32,075 WARN L188 SmtUtils]: Spent 421.00 ms on a formula simplification. DAG size of input: 347 DAG size of output: 11 [2019-09-05 13:17:32,579 WARN L188 SmtUtils]: Spent 424.00 ms on a formula simplification. DAG size of input: 344 DAG size of output: 11 [2019-09-05 13:17:33,113 WARN L188 SmtUtils]: Spent 444.00 ms on a formula simplification. DAG size of input: 341 DAG size of output: 11 [2019-09-05 13:17:33,627 WARN L188 SmtUtils]: Spent 410.00 ms on a formula simplification. DAG size of input: 338 DAG size of output: 11 [2019-09-05 13:17:34,144 WARN L188 SmtUtils]: Spent 403.00 ms on a formula simplification. DAG size of input: 335 DAG size of output: 11 [2019-09-05 13:17:34,679 WARN L188 SmtUtils]: Spent 397.00 ms on a formula simplification. DAG size of input: 332 DAG size of output: 11 [2019-09-05 13:17:35,206 WARN L188 SmtUtils]: Spent 396.00 ms on a formula simplification. DAG size of input: 329 DAG size of output: 11 [2019-09-05 13:17:35,744 WARN L188 SmtUtils]: Spent 387.00 ms on a formula simplification. DAG size of input: 326 DAG size of output: 11 [2019-09-05 13:17:36,269 WARN L188 SmtUtils]: Spent 374.00 ms on a formula simplification. DAG size of input: 323 DAG size of output: 11 [2019-09-05 13:17:36,805 WARN L188 SmtUtils]: Spent 382.00 ms on a formula simplification. DAG size of input: 320 DAG size of output: 11 [2019-09-05 13:17:37,349 WARN L188 SmtUtils]: Spent 364.00 ms on a formula simplification. DAG size of input: 317 DAG size of output: 11 [2019-09-05 13:17:37,895 WARN L188 SmtUtils]: Spent 362.00 ms on a formula simplification. DAG size of input: 314 DAG size of output: 11 [2019-09-05 13:17:38,457 WARN L188 SmtUtils]: Spent 361.00 ms on a formula simplification. DAG size of input: 311 DAG size of output: 11 [2019-09-05 13:17:39,035 WARN L188 SmtUtils]: Spent 378.00 ms on a formula simplification. DAG size of input: 308 DAG size of output: 11 [2019-09-05 13:17:39,594 WARN L188 SmtUtils]: Spent 343.00 ms on a formula simplification. DAG size of input: 305 DAG size of output: 11 [2019-09-05 13:17:40,148 WARN L188 SmtUtils]: Spent 335.00 ms on a formula simplification. DAG size of input: 302 DAG size of output: 11 [2019-09-05 13:17:40,718 WARN L188 SmtUtils]: Spent 334.00 ms on a formula simplification. DAG size of input: 299 DAG size of output: 11 [2019-09-05 13:17:41,280 WARN L188 SmtUtils]: Spent 334.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2019-09-05 13:17:41,869 WARN L188 SmtUtils]: Spent 325.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2019-09-05 13:17:42,436 WARN L188 SmtUtils]: Spent 306.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2019-09-05 13:17:42,988 WARN L188 SmtUtils]: Spent 307.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2019-09-05 13:17:43,540 WARN L188 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2019-09-05 13:17:44,104 WARN L188 SmtUtils]: Spent 299.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2019-09-05 13:17:44,672 WARN L188 SmtUtils]: Spent 292.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2019-09-05 13:17:45,236 WARN L188 SmtUtils]: Spent 287.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2019-09-05 13:17:45,841 WARN L188 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2019-09-05 13:17:46,404 WARN L188 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2019-09-05 13:17:46,976 WARN L188 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2019-09-05 13:17:47,533 WARN L188 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2019-09-05 13:17:48,104 WARN L188 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-05 13:17:48,676 WARN L188 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-05 13:17:49,239 WARN L188 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-05 13:17:49,805 WARN L188 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-05 13:17:50,377 WARN L188 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-05 13:17:50,976 WARN L188 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-05 13:17:51,523 WARN L188 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-05 13:17:52,079 WARN L188 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-05 13:17:52,609 WARN L188 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-05 13:17:53,153 WARN L188 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-05 13:17:53,717 WARN L188 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-05 13:17:54,308 WARN L188 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-05 13:17:54,855 WARN L188 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-05 13:17:55,391 WARN L188 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-05 13:17:55,928 WARN L188 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-05 13:17:56,468 WARN L188 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-05 13:17:57,007 WARN L188 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-05 13:17:57,537 WARN L188 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-05 13:17:58,064 WARN L188 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-05 13:17:58,593 WARN L188 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-05 13:17:59,153 WARN L188 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-05 13:17:59,683 WARN L188 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-05 13:18:00,228 WARN L188 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-05 13:18:00,760 WARN L188 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-05 13:18:01,293 WARN L188 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-05 13:18:01,809 WARN L188 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-05 13:18:02,322 WARN L188 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-05 13:18:02,846 WARN L188 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-05 13:18:03,374 WARN L188 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-05 13:18:03,885 WARN L188 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-05 13:18:04,420 WARN L188 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-05 13:18:04,936 WARN L188 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-05 13:18:05,445 WARN L188 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-05 13:18:05,952 WARN L188 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-05 13:18:06,442 WARN L188 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-05 13:18:06,930 WARN L188 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-05 13:18:07,398 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-05 13:18:07,857 WARN L188 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-05 13:18:22,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:18:22,504 INFO L93 Difference]: Finished difference Result 252 states and 252 transitions. [2019-09-05 13:18:22,505 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2019-09-05 13:18:22,505 INFO L78 Accepts]: Start accepts. Automaton has 123 states. Word has length 243 [2019-09-05 13:18:22,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:18:22,506 INFO L225 Difference]: With dead ends: 252 [2019-09-05 13:18:22,506 INFO L226 Difference]: Without dead ends: 252 [2019-09-05 13:18:22,510 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 724 GetRequests, 366 SyntacticMatches, 2 SemanticMatches, 356 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8184 ImplicationChecksByTransitivity, 77.2s TimeCoverageRelationStatistics Valid=48703, Invalid=79103, Unknown=0, NotChecked=0, Total=127806 [2019-09-05 13:18:22,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2019-09-05 13:18:22,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 252. [2019-09-05 13:18:22,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 252 states. [2019-09-05 13:18:22,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 252 transitions. [2019-09-05 13:18:22,514 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 252 transitions. Word has length 243 [2019-09-05 13:18:22,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:18:22,515 INFO L475 AbstractCegarLoop]: Abstraction has 252 states and 252 transitions. [2019-09-05 13:18:22,515 INFO L476 AbstractCegarLoop]: Interpolant automaton has 123 states. [2019-09-05 13:18:22,515 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 252 transitions. [2019-09-05 13:18:22,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 252 [2019-09-05 13:18:22,516 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:18:22,517 INFO L399 BasicCegarLoop]: trace histogram [120, 120, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:18:22,517 INFO L418 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:18:22,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:18:22,517 INFO L82 PathProgramCache]: Analyzing trace with hash -296928497, now seen corresponding path program 31 times [2019-09-05 13:18:22,517 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:18:22,518 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:18:22,518 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:18:22,518 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:18:22,518 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:18:23,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:18:30,446 INFO L134 CoverageAnalysis]: Checked inductivity of 14400 backedges. 0 proven. 14400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:18:30,446 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:18:30,446 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-05 13:18:30,446 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:18:30,446 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:18:30,447 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:18:30,447 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 [2019-09-05 13:18:30,459 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:18:30,459 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-05 13:18:31,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:18:32,947 INFO L256 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 123 conjunts are in the unsatisfiable core [2019-09-05 13:18:32,950 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:18:33,388 INFO L134 CoverageAnalysis]: Checked inductivity of 14400 backedges. 0 proven. 14400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:18:33,388 INFO L322 TraceCheckSpWp]: Computing backward predicates...