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-c6af20d [2019-09-03 20:56:40,922 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-03 20:56:40,924 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-03 20:56:40,938 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-09-03 20:56:40,999 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 [2019-09-03 20:56:41,020 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-03 20:56:41,021 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-03 20:56:41,021 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-03 20:56:41,022 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-03 20:56:41,022 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-03 20:56:41,022 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-03 20:56:41,023 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-03 20:56:41,023 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-03 20:56:41,023 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-03 20:56:41,023 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-03 20:56:41,025 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-03 20:56:41,026 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-03 20:56:41,026 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-03 20:56:41,026 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-03 20:56:41,026 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-03 20:56:41,027 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-03 20:56:41,027 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-03 20:56:41,027 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-03 20:56:41,027 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-03 20:56:41,028 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-03 20:56:41,028 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-03 20:56:41,028 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-03 20:56:41,028 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-03 20:56:41,028 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-03 20:56:41,029 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-03 20:56:41,029 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-03 20:56:41,029 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-03 20:56:41,029 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-03 20:56:41,029 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-03 20:56:41,030 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-03 20:56:41,077 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-03 20:56:41,095 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-03 20:56:41,100 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-03 20:56:41,101 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-03 20:56:41,101 INFO L275 PluginConnector]: CDTParser initialized [2019-09-03 20:56:41,102 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-new/count_by_k.i [2019-09-03 20:56:41,169 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a80338294/17b888db8e66442ea39b86ffdf5ba263/FLAGfdf2deaaa [2019-09-03 20:56:41,585 INFO L306 CDTParser]: Found 1 translation units. [2019-09-03 20:56:41,586 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_k.i [2019-09-03 20:56:41,593 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a80338294/17b888db8e66442ea39b86ffdf5ba263/FLAGfdf2deaaa [2019-09-03 20:56:41,995 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a80338294/17b888db8e66442ea39b86ffdf5ba263 [2019-09-03 20:56:42,004 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-03 20:56:42,006 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-03 20:56:42,007 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-03 20:56:42,007 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-03 20:56:42,011 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-03 20:56:42,012 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.09 08:56:41" (1/1) ... [2019-09-03 20:56:42,014 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1460d7aa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:56:42, skipping insertion in model container [2019-09-03 20:56:42,014 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.09 08:56:41" (1/1) ... [2019-09-03 20:56:42,021 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-03 20:56:42,042 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-03 20:56:42,205 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-03 20:56:42,210 INFO L188 MainTranslator]: Completed pre-run [2019-09-03 20:56:42,223 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-03 20:56:42,235 INFO L192 MainTranslator]: Completed translation [2019-09-03 20:56:42,235 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:56:42 WrapperNode [2019-09-03 20:56:42,235 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-03 20:56:42,236 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-03 20:56:42,236 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-03 20:56:42,236 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-03 20:56:42,346 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:56:42" (1/1) ... [2019-09-03 20:56:42,347 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:56:42" (1/1) ... [2019-09-03 20:56:42,352 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:56:42" (1/1) ... [2019-09-03 20:56:42,352 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:56:42" (1/1) ... [2019-09-03 20:56:42,355 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:56:42" (1/1) ... [2019-09-03 20:56:42,363 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:56:42" (1/1) ... [2019-09-03 20:56:42,364 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:56:42" (1/1) ... [2019-09-03 20:56:42,365 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-03 20:56:42,366 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-03 20:56:42,366 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-03 20:56:42,366 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-03 20:56:42,367 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:56:42" (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 [2019-09-03 20:56:42,415 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-03 20:56:42,415 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-03 20:56:42,415 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-03 20:56:42,415 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-03 20:56:42,415 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-03 20:56:42,415 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-09-03 20:56:42,415 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-03 20:56:42,415 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-09-03 20:56:42,416 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-03 20:56:42,416 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-03 20:56:42,416 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-03 20:56:42,571 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-03 20:56:42,571 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-03 20:56:42,572 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.09 08:56:42 BoogieIcfgContainer [2019-09-03 20:56:42,572 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-03 20:56:42,573 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-03 20:56:42,573 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-03 20:56:42,576 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-03 20:56:42,577 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.09 08:56:41" (1/3) ... [2019-09-03 20:56:42,577 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c2ef0fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.09 08:56:42, skipping insertion in model container [2019-09-03 20:56:42,578 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 08:56:42" (2/3) ... [2019-09-03 20:56:42,578 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c2ef0fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.09 08:56:42, skipping insertion in model container [2019-09-03 20:56:42,578 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.09 08:56:42" (3/3) ... [2019-09-03 20:56:42,580 INFO L109 eAbstractionObserver]: Analyzing ICFG count_by_k.i [2019-09-03 20:56:42,589 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-03 20:56:42,597 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-03 20:56:42,615 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-03 20:56:42,648 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-03 20:56:42,648 INFO L378 AbstractCegarLoop]: Hoare is false [2019-09-03 20:56:42,649 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-03 20:56:42,649 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-03 20:56:42,649 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-03 20:56:42,650 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-03 20:56:42,650 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-03 20:56:42,650 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-03 20:56:42,670 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2019-09-03 20:56:42,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-09-03 20:56:42,682 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:56:42,683 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:56:42,685 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:56:42,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:56:42,693 INFO L82 PathProgramCache]: Analyzing trace with hash -1281911547, now seen corresponding path program 1 times [2019-09-03 20:56:42,695 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:56:42,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:56:42,747 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:56:42,747 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:56:42,747 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:56:42,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:56:42,804 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:42,805 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-03 20:56:42,805 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-09-03 20:56:42,806 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-03 20:56:42,810 INFO L454 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-09-03 20:56:42,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-09-03 20:56:42,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-09-03 20:56:42,827 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2019-09-03 20:56:42,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:56:42,840 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2019-09-03 20:56:42,840 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-09-03 20:56:42,842 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2019-09-03 20:56:42,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:56:42,851 INFO L225 Difference]: With dead ends: 20 [2019-09-03 20:56:42,851 INFO L226 Difference]: Without dead ends: 13 [2019-09-03 20:56:42,853 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 [2019-09-03 20:56:42,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-09-03 20:56:42,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-09-03 20:56:42,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-09-03 20:56:42,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2019-09-03 20:56:42,888 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2019-09-03 20:56:42,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:56:42,889 INFO L475 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2019-09-03 20:56:42,889 INFO L476 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-09-03 20:56:42,889 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2019-09-03 20:56:42,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-09-03 20:56:42,890 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:56:42,890 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:56:42,891 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:56:42,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:56:42,891 INFO L82 PathProgramCache]: Analyzing trace with hash -1287452673, now seen corresponding path program 1 times [2019-09-03 20:56:42,891 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:56:42,893 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:56:42,893 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:56:42,893 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:56:42,893 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:56:42,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:56:43,098 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:43,099 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-03 20:56:43,099 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-09-03 20:56:43,099 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-03 20:56:43,102 INFO L454 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-09-03 20:56:43,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-09-03 20:56:43,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2019-09-03 20:56:43,103 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 6 states. [2019-09-03 20:56:43,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:56:43,172 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2019-09-03 20:56:43,172 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-03 20:56:43,173 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 11 [2019-09-03 20:56:43,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:56:43,174 INFO L225 Difference]: With dead ends: 17 [2019-09-03 20:56:43,174 INFO L226 Difference]: Without dead ends: 14 [2019-09-03 20:56:43,175 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 [2019-09-03 20:56:43,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-09-03 20:56:43,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-09-03 20:56:43,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-09-03 20:56:43,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2019-09-03 20:56:43,181 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2019-09-03 20:56:43,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:56:43,181 INFO L475 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2019-09-03 20:56:43,182 INFO L476 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-09-03 20:56:43,182 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2019-09-03 20:56:43,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-09-03 20:56:43,182 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:56:43,183 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:56:43,183 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:56:43,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:56:43,184 INFO L82 PathProgramCache]: Analyzing trace with hash 843923389, now seen corresponding path program 1 times [2019-09-03 20:56:43,184 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:56:43,185 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:56:43,186 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:56:43,186 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:56:43,187 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:56:43,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:56:43,319 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:43,319 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:56:43,320 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:56:43,321 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2019-09-03 20:56:43,323 INFO L207 CegarAbsIntRunner]: [0], [4], [8], [14], [16], [18], [25], [28], [30], [36], [37], [38], [40] [2019-09-03 20:56:43,357 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-03 20:56:43,357 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-03 20:56:43,475 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-03 20:56:43,478 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. [2019-09-03 20:56:43,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:56:43,482 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-03 20:56:43,482 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:56:43,483 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) [2019-09-03 20:56:43,513 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:56:43,514 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-03 20:56:43,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:56:43,528 INFO L256 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2019-09-03 20:56:43,533 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:56:43,622 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:43,623 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:56:43,703 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:43,708 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:56:43,708 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 13 [2019-09-03 20:56:43,709 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:56:43,709 INFO L454 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-09-03 20:56:43,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-09-03 20:56:43,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2019-09-03 20:56:43,711 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 10 states. [2019-09-03 20:56:43,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:56:43,867 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2019-09-03 20:56:43,867 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-09-03 20:56:43,868 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 13 [2019-09-03 20:56:43,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:56:43,869 INFO L225 Difference]: With dead ends: 24 [2019-09-03 20:56:43,869 INFO L226 Difference]: Without dead ends: 20 [2019-09-03 20:56:43,871 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 [2019-09-03 20:56:43,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-09-03 20:56:43,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-09-03 20:56:43,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-09-03 20:56:43,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2019-09-03 20:56:43,879 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 13 [2019-09-03 20:56:43,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:56:43,880 INFO L475 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2019-09-03 20:56:43,880 INFO L476 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-09-03 20:56:43,880 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2019-09-03 20:56:43,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-09-03 20:56:43,881 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:56:43,882 INFO L399 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:56:43,882 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:56:43,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:56:43,882 INFO L82 PathProgramCache]: Analyzing trace with hash 1549375991, now seen corresponding path program 2 times [2019-09-03 20:56:43,883 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:56:43,884 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:56:43,884 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:56:43,884 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:56:43,884 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:56:43,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:56:44,023 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:44,023 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:56:44,023 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:56:44,023 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:56:44,024 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:56:44,024 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:56:44,024 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-03 20:56:44,047 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-03 20:56:44,048 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:56:44,062 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-09-03 20:56:44,062 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:56:44,063 INFO L256 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 7 conjunts are in the unsatisfiable core [2019-09-03 20:56:44,064 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:56:44,129 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:44,129 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:56:44,244 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:44,248 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:56:44,248 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2019-09-03 20:56:44,249 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:56:44,249 INFO L454 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-09-03 20:56:44,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-09-03 20:56:44,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2019-09-03 20:56:44,250 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 11 states. [2019-09-03 20:56:44,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:56:44,435 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2019-09-03 20:56:44,435 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-09-03 20:56:44,435 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 19 [2019-09-03 20:56:44,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:56:44,436 INFO L225 Difference]: With dead ends: 28 [2019-09-03 20:56:44,436 INFO L226 Difference]: Without dead ends: 28 [2019-09-03 20:56:44,437 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 [2019-09-03 20:56:44,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-09-03 20:56:44,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-09-03 20:56:44,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-09-03 20:56:44,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2019-09-03 20:56:44,442 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 19 [2019-09-03 20:56:44,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:56:44,442 INFO L475 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2019-09-03 20:56:44,442 INFO L476 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-09-03 20:56:44,442 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2019-09-03 20:56:44,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-09-03 20:56:44,445 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:56:44,445 INFO L399 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:56:44,446 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:56:44,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:56:44,446 INFO L82 PathProgramCache]: Analyzing trace with hash -191187985, now seen corresponding path program 3 times [2019-09-03 20:56:44,446 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:56:44,447 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:56:44,447 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:56:44,447 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:56:44,448 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:56:44,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:56:44,598 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:44,598 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:56:44,598 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:56:44,598 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:56:44,599 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:56:44,599 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:56:44,599 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) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:56:44,619 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-03 20:56:44,619 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-03 20:56:44,631 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 20:56:44,631 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:56:44,632 INFO L256 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 11 conjunts are in the unsatisfiable core [2019-09-03 20:56:44,638 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:56:44,721 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:44,722 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:56:44,982 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:44,986 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:56:44,987 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2019-09-03 20:56:44,987 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:56:44,987 INFO L454 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-09-03 20:56:44,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-09-03 20:56:44,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=354, Unknown=0, NotChecked=0, Total=506 [2019-09-03 20:56:44,989 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 15 states. [2019-09-03 20:56:45,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:56:45,367 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2019-09-03 20:56:45,368 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-09-03 20:56:45,368 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 27 [2019-09-03 20:56:45,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:56:45,372 INFO L225 Difference]: With dead ends: 36 [2019-09-03 20:56:45,372 INFO L226 Difference]: Without dead ends: 36 [2019-09-03 20:56:45,373 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 [2019-09-03 20:56:45,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-09-03 20:56:45,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2019-09-03 20:56:45,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-09-03 20:56:45,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2019-09-03 20:56:45,381 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 27 [2019-09-03 20:56:45,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:56:45,381 INFO L475 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2019-09-03 20:56:45,382 INFO L476 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-09-03 20:56:45,382 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2019-09-03 20:56:45,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-09-03 20:56:45,383 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:56:45,383 INFO L399 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:56:45,383 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:56:45,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:56:45,384 INFO L82 PathProgramCache]: Analyzing trace with hash 217994727, now seen corresponding path program 4 times [2019-09-03 20:56:45,384 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:56:45,385 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:56:45,385 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:56:45,385 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:56:45,385 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:56:45,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:56:45,607 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:45,607 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:56:45,608 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:56:45,608 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:56:45,608 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:56:45,609 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:56:45,609 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) [2019-09-03 20:56:45,630 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:56:45,630 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 [2019-09-03 20:56:45,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:56:45,655 INFO L256 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 15 conjunts are in the unsatisfiable core [2019-09-03 20:56:45,658 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:56:45,756 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:45,756 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:56:46,158 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:46,162 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:56:46,162 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2019-09-03 20:56:46,162 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:56:46,163 INFO L454 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-09-03 20:56:46,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-09-03 20:56:46,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=640, Unknown=0, NotChecked=0, Total=930 [2019-09-03 20:56:46,164 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 19 states. [2019-09-03 20:56:46,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:56:46,718 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2019-09-03 20:56:46,722 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-09-03 20:56:46,723 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 35 [2019-09-03 20:56:46,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:56:46,724 INFO L225 Difference]: With dead ends: 44 [2019-09-03 20:56:46,724 INFO L226 Difference]: Without dead ends: 44 [2019-09-03 20:56:46,725 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 [2019-09-03 20:56:46,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-09-03 20:56:46,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2019-09-03 20:56:46,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-09-03 20:56:46,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2019-09-03 20:56:46,731 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 35 [2019-09-03 20:56:46,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:56:46,731 INFO L475 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2019-09-03 20:56:46,731 INFO L476 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-09-03 20:56:46,731 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2019-09-03 20:56:46,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-09-03 20:56:46,732 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:56:46,733 INFO L399 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:56:46,733 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:56:46,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:56:46,733 INFO L82 PathProgramCache]: Analyzing trace with hash -1099137057, now seen corresponding path program 5 times [2019-09-03 20:56:46,733 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:56:46,734 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:56:46,734 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:56:46,734 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:56:46,735 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:56:46,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:56:47,053 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:47,053 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:56:47,053 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:56:47,054 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:56:47,054 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:56:47,054 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:56:47,054 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 20:56:47,079 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-03 20:56:47,079 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-03 20:56:47,112 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2019-09-03 20:56:47,112 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:56:47,114 INFO L256 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 19 conjunts are in the unsatisfiable core [2019-09-03 20:56:47,117 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:56:47,232 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:47,232 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:56:47,820 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (6)] Exception during sending of exit command (exit): Broken pipe [2019-09-03 20:56:47,827 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:56:47,828 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2019-09-03 20:56:47,828 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:56:47,830 INFO L454 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-09-03 20:56:47,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-09-03 20:56:47,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=476, Invalid=1006, Unknown=0, NotChecked=0, Total=1482 [2019-09-03 20:56:47,833 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 23 states. [2019-09-03 20:56:48,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:56:48,691 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2019-09-03 20:56:48,692 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-09-03 20:56:48,692 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 43 [2019-09-03 20:56:48,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:56:48,693 INFO L225 Difference]: With dead ends: 52 [2019-09-03 20:56:48,693 INFO L226 Difference]: Without dead ends: 52 [2019-09-03 20:56:48,695 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 [2019-09-03 20:56:48,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-09-03 20:56:48,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2019-09-03 20:56:48,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-09-03 20:56:48,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2019-09-03 20:56:48,700 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 43 [2019-09-03 20:56:48,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:56:48,701 INFO L475 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2019-09-03 20:56:48,701 INFO L476 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-09-03 20:56:48,701 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2019-09-03 20:56:48,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-09-03 20:56:48,702 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:56:48,703 INFO L399 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:56:48,703 INFO L418 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:56:48,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:56:48,703 INFO L82 PathProgramCache]: Analyzing trace with hash -1441975849, now seen corresponding path program 6 times [2019-09-03 20:56:48,703 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:56:48,704 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:56:48,704 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:56:48,705 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:56:48,705 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:56:48,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:56:49,072 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:49,072 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:56:49,072 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:56:49,073 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:56:49,073 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:56:49,073 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:56:49,073 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 [2019-09-03 20:56:49,087 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-03 20:56:49,087 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-03 20:56:49,108 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 20:56:49,108 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:56:49,113 INFO L256 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 23 conjunts are in the unsatisfiable core [2019-09-03 20:56:49,115 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:56:49,201 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:49,201 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:56:49,983 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:49,989 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:56:49,989 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2019-09-03 20:56:49,989 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:56:49,990 INFO L454 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-09-03 20:56:49,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-09-03 20:56:49,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=710, Invalid=1452, Unknown=0, NotChecked=0, Total=2162 [2019-09-03 20:56:49,991 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 27 states. [2019-09-03 20:56:51,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:56:51,141 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2019-09-03 20:56:51,143 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-09-03 20:56:51,143 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 51 [2019-09-03 20:56:51,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:56:51,144 INFO L225 Difference]: With dead ends: 60 [2019-09-03 20:56:51,145 INFO L226 Difference]: Without dead ends: 60 [2019-09-03 20:56:51,146 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 [2019-09-03 20:56:51,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-09-03 20:56:51,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2019-09-03 20:56:51,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-09-03 20:56:51,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2019-09-03 20:56:51,165 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 51 [2019-09-03 20:56:51,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:56:51,166 INFO L475 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2019-09-03 20:56:51,166 INFO L476 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-09-03 20:56:51,166 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2019-09-03 20:56:51,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2019-09-03 20:56:51,167 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:56:51,167 INFO L399 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:56:51,167 INFO L418 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:56:51,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:56:51,168 INFO L82 PathProgramCache]: Analyzing trace with hash -123180081, now seen corresponding path program 7 times [2019-09-03 20:56:51,168 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:56:51,169 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:56:51,169 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:56:51,169 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:56:51,169 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:56:51,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:56:51,601 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:51,601 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:56:51,602 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:56:51,602 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:56:51,602 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:56:51,602 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:56:51,602 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 [2019-09-03 20:56:51,617 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:56:51,617 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-03 20:56:51,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:56:51,657 INFO L256 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 27 conjunts are in the unsatisfiable core [2019-09-03 20:56:51,660 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:56:51,773 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:51,774 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:56:52,828 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:52,841 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:56:52,842 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2019-09-03 20:56:52,842 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:56:52,844 INFO L454 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-09-03 20:56:52,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-09-03 20:56:52,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=992, Invalid=1978, Unknown=0, NotChecked=0, Total=2970 [2019-09-03 20:56:52,847 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 31 states. [2019-09-03 20:56:54,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:56:54,462 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2019-09-03 20:56:54,462 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-09-03 20:56:54,462 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 59 [2019-09-03 20:56:54,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:56:54,463 INFO L225 Difference]: With dead ends: 68 [2019-09-03 20:56:54,463 INFO L226 Difference]: Without dead ends: 68 [2019-09-03 20:56:54,465 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 594 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2381, Invalid=4261, Unknown=0, NotChecked=0, Total=6642 [2019-09-03 20:56:54,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-09-03 20:56:54,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2019-09-03 20:56:54,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2019-09-03 20:56:54,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 68 transitions. [2019-09-03 20:56:54,471 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 68 transitions. Word has length 59 [2019-09-03 20:56:54,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:56:54,471 INFO L475 AbstractCegarLoop]: Abstraction has 68 states and 68 transitions. [2019-09-03 20:56:54,471 INFO L476 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-09-03 20:56:54,471 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 68 transitions. [2019-09-03 20:56:54,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-09-03 20:56:54,472 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:56:54,472 INFO L399 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:56:54,473 INFO L418 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:56:54,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:56:54,473 INFO L82 PathProgramCache]: Analyzing trace with hash 1531325895, now seen corresponding path program 8 times [2019-09-03 20:56:54,473 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:56:54,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:56:54,474 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:56:54,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:56:54,474 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:56:54,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:56:55,086 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:55,087 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:56:55,087 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:56:55,087 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:56:55,087 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:56:55,088 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:56:55,088 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 [2019-09-03 20:56:55,103 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-03 20:56:55,103 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-03 20:56:55,138 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2019-09-03 20:56:55,138 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:56:55,140 INFO L256 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 31 conjunts are in the unsatisfiable core [2019-09-03 20:56:55,144 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:56:55,261 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:55,261 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:56:56,735 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (9)] Exception during sending of exit command (exit): Broken pipe [2019-09-03 20:56:56,739 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:56:56,739 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2019-09-03 20:56:56,739 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:56:56,740 INFO L454 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-09-03 20:56:56,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-09-03 20:56:56,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1322, Invalid=2584, Unknown=0, NotChecked=0, Total=3906 [2019-09-03 20:56:56,741 INFO L87 Difference]: Start difference. First operand 68 states and 68 transitions. Second operand 35 states. [2019-09-03 20:56:58,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:56:58,983 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2019-09-03 20:56:58,984 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-09-03 20:56:58,984 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 67 [2019-09-03 20:56:58,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:56:58,985 INFO L225 Difference]: With dead ends: 76 [2019-09-03 20:56:58,985 INFO L226 Difference]: Without dead ends: 76 [2019-09-03 20:56:58,988 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 [2019-09-03 20:56:58,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-09-03 20:56:58,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2019-09-03 20:56:58,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-09-03 20:56:58,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 76 transitions. [2019-09-03 20:56:58,994 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 76 transitions. Word has length 67 [2019-09-03 20:56:58,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:56:58,994 INFO L475 AbstractCegarLoop]: Abstraction has 76 states and 76 transitions. [2019-09-03 20:56:58,995 INFO L476 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-09-03 20:56:58,995 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 76 transitions. [2019-09-03 20:56:58,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-09-03 20:56:58,996 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:56:58,996 INFO L399 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:56:58,996 INFO L418 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:56:58,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:56:58,997 INFO L82 PathProgramCache]: Analyzing trace with hash 182351807, now seen corresponding path program 9 times [2019-09-03 20:56:58,997 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:56:58,998 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:56:58,998 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:56:58,998 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:56:58,998 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:56:59,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:56:59,672 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:59,672 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:56:59,672 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:56:59,672 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:56:59,672 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:56:59,672 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:56:59,673 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 [2019-09-03 20:56:59,683 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-03 20:56:59,683 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-03 20:56:59,707 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 20:56:59,708 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:56:59,711 INFO L256 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 35 conjunts are in the unsatisfiable core [2019-09-03 20:56:59,714 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:56:59,875 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:56:59,875 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:57:01,505 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (10)] Exception during sending of exit command (exit): Broken pipe [2019-09-03 20:57:01,508 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:57:01,508 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 71 [2019-09-03 20:57:01,508 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:57:01,509 INFO L454 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-09-03 20:57:01,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-09-03 20:57:01,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1700, Invalid=3270, Unknown=0, NotChecked=0, Total=4970 [2019-09-03 20:57:01,511 INFO L87 Difference]: Start difference. First operand 76 states and 76 transitions. Second operand 39 states. [2019-09-03 20:57:04,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:57:04,174 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2019-09-03 20:57:04,174 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-09-03 20:57:04,174 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 75 [2019-09-03 20:57:04,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:57:04,176 INFO L225 Difference]: With dead ends: 84 [2019-09-03 20:57:04,176 INFO L226 Difference]: Without dead ends: 84 [2019-09-03 20:57:04,180 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 [2019-09-03 20:57:04,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2019-09-03 20:57:04,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2019-09-03 20:57:04,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2019-09-03 20:57:04,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 84 transitions. [2019-09-03 20:57:04,185 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 84 transitions. Word has length 75 [2019-09-03 20:57:04,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:57:04,186 INFO L475 AbstractCegarLoop]: Abstraction has 84 states and 84 transitions. [2019-09-03 20:57:04,186 INFO L476 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-09-03 20:57:04,186 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 84 transitions. [2019-09-03 20:57:04,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2019-09-03 20:57:04,187 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:57:04,187 INFO L399 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:57:04,188 INFO L418 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:57:04,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:57:04,188 INFO L82 PathProgramCache]: Analyzing trace with hash -932623945, now seen corresponding path program 10 times [2019-09-03 20:57:04,188 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:57:04,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:57:04,189 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:57:04,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:57:04,189 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:57:04,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:57:05,128 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:57:05,129 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:57:05,129 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:57:05,129 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:57:05,129 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:57:05,129 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:57:05,129 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 [2019-09-03 20:57:05,144 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:57:05,145 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-03 20:57:05,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:57:05,248 INFO L256 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 39 conjunts are in the unsatisfiable core [2019-09-03 20:57:05,251 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:57:05,390 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:57:05,390 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:57:07,329 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (11)] Exception during sending of exit command (exit): Broken pipe [2019-09-03 20:57:07,337 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:57:07,337 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2019-09-03 20:57:07,337 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:57:07,338 INFO L454 AbstractCegarLoop]: Interpolant automaton has 43 states [2019-09-03 20:57:07,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2019-09-03 20:57:07,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2126, Invalid=4036, Unknown=0, NotChecked=0, Total=6162 [2019-09-03 20:57:07,340 INFO L87 Difference]: Start difference. First operand 84 states and 84 transitions. Second operand 43 states. [2019-09-03 20:57:10,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:57:10,647 INFO L93 Difference]: Finished difference Result 92 states and 92 transitions. [2019-09-03 20:57:10,647 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2019-09-03 20:57:10,647 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 83 [2019-09-03 20:57:10,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:57:10,648 INFO L225 Difference]: With dead ends: 92 [2019-09-03 20:57:10,648 INFO L226 Difference]: Without dead ends: 92 [2019-09-03 20:57:10,650 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 126 SyntacticMatches, 2 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1104 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=5063, Invalid=8743, Unknown=0, NotChecked=0, Total=13806 [2019-09-03 20:57:10,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2019-09-03 20:57:10,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2019-09-03 20:57:10,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2019-09-03 20:57:10,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 92 transitions. [2019-09-03 20:57:10,657 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 92 transitions. Word has length 83 [2019-09-03 20:57:10,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:57:10,657 INFO L475 AbstractCegarLoop]: Abstraction has 92 states and 92 transitions. [2019-09-03 20:57:10,657 INFO L476 AbstractCegarLoop]: Interpolant automaton has 43 states. [2019-09-03 20:57:10,657 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 92 transitions. [2019-09-03 20:57:10,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2019-09-03 20:57:10,659 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:57:10,659 INFO L399 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:57:10,659 INFO L418 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:57:10,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:57:10,660 INFO L82 PathProgramCache]: Analyzing trace with hash -589388881, now seen corresponding path program 11 times [2019-09-03 20:57:10,660 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:57:10,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:57:10,664 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:57:10,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:57:10,664 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:57:10,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:57:11,706 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:57:11,706 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:57:11,706 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:57:11,706 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:57:11,706 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:57:11,707 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:57:11,707 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 [2019-09-03 20:57:11,720 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-03 20:57:11,720 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-03 20:57:11,770 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2019-09-03 20:57:11,770 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:57:11,773 INFO L256 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 43 conjunts are in the unsatisfiable core [2019-09-03 20:57:11,775 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:57:11,981 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:57:11,981 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:57:14,399 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:57:14,403 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:57:14,403 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 87 [2019-09-03 20:57:14,403 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:57:14,404 INFO L454 AbstractCegarLoop]: Interpolant automaton has 47 states [2019-09-03 20:57:14,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2019-09-03 20:57:14,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2600, Invalid=4882, Unknown=0, NotChecked=0, Total=7482 [2019-09-03 20:57:14,406 INFO L87 Difference]: Start difference. First operand 92 states and 92 transitions. Second operand 47 states. [2019-09-03 20:57:18,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:57:18,525 INFO L93 Difference]: Finished difference Result 100 states and 100 transitions. [2019-09-03 20:57:18,526 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2019-09-03 20:57:18,526 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 91 [2019-09-03 20:57:18,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:57:18,526 INFO L225 Difference]: With dead ends: 100 [2019-09-03 20:57:18,526 INFO L226 Difference]: Without dead ends: 100 [2019-09-03 20:57:18,528 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 138 SyntacticMatches, 2 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1306 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=6181, Invalid=10589, Unknown=0, NotChecked=0, Total=16770 [2019-09-03 20:57:18,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2019-09-03 20:57:18,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2019-09-03 20:57:18,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2019-09-03 20:57:18,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 100 transitions. [2019-09-03 20:57:18,534 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 100 transitions. Word has length 91 [2019-09-03 20:57:18,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:57:18,534 INFO L475 AbstractCegarLoop]: Abstraction has 100 states and 100 transitions. [2019-09-03 20:57:18,534 INFO L476 AbstractCegarLoop]: Interpolant automaton has 47 states. [2019-09-03 20:57:18,534 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 100 transitions. [2019-09-03 20:57:18,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2019-09-03 20:57:18,536 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:57:18,536 INFO L399 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:57:18,536 INFO L418 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:57:18,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:57:18,536 INFO L82 PathProgramCache]: Analyzing trace with hash 423003559, now seen corresponding path program 12 times [2019-09-03 20:57:18,537 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:57:18,537 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:57:18,537 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:57:18,537 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:57:18,538 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:57:18,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:57:19,721 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:57:19,722 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:57:19,722 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:57:19,722 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:57:19,722 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:57:19,722 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:57:19,722 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 [2019-09-03 20:57:19,732 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-03 20:57:19,732 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-03 20:57:19,804 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 20:57:19,804 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:57:19,831 INFO L256 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 47 conjunts are in the unsatisfiable core [2019-09-03 20:57:19,833 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:57:20,045 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:57:20,045 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:57:22,861 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:57:22,865 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:57:22,865 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 95 [2019-09-03 20:57:22,865 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:57:22,865 INFO L454 AbstractCegarLoop]: Interpolant automaton has 51 states [2019-09-03 20:57:22,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2019-09-03 20:57:22,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3122, Invalid=5808, Unknown=0, NotChecked=0, Total=8930 [2019-09-03 20:57:22,867 INFO L87 Difference]: Start difference. First operand 100 states and 100 transitions. Second operand 51 states. [2019-09-03 20:57:23,250 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 141 DAG size of output: 9 [2019-09-03 20:57:23,375 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2019-09-03 20:57:27,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:57:27,947 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2019-09-03 20:57:27,947 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2019-09-03 20:57:27,947 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 99 [2019-09-03 20:57:27,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:57:27,948 INFO L225 Difference]: With dead ends: 108 [2019-09-03 20:57:27,948 INFO L226 Difference]: Without dead ends: 108 [2019-09-03 20:57:27,949 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 150 SyntacticMatches, 2 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1524 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=7411, Invalid=12611, Unknown=0, NotChecked=0, Total=20022 [2019-09-03 20:57:27,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2019-09-03 20:57:27,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2019-09-03 20:57:27,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2019-09-03 20:57:27,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 108 transitions. [2019-09-03 20:57:27,955 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 108 transitions. Word has length 99 [2019-09-03 20:57:27,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:57:27,955 INFO L475 AbstractCegarLoop]: Abstraction has 108 states and 108 transitions. [2019-09-03 20:57:27,956 INFO L476 AbstractCegarLoop]: Interpolant automaton has 51 states. [2019-09-03 20:57:27,956 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 108 transitions. [2019-09-03 20:57:27,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2019-09-03 20:57:27,957 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:57:27,957 INFO L399 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:57:27,957 INFO L418 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:57:27,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:57:27,958 INFO L82 PathProgramCache]: Analyzing trace with hash -697765985, now seen corresponding path program 13 times [2019-09-03 20:57:27,958 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:57:27,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:57:27,959 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:57:27,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:57:27,959 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:57:28,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:57:29,297 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:57:29,297 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:57:29,298 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:57:29,298 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:57:29,298 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:57:29,298 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:57:29,298 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 [2019-09-03 20:57:29,314 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:57:29,314 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-03 20:57:29,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:57:29,499 INFO L256 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 51 conjunts are in the unsatisfiable core [2019-09-03 20:57:29,502 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:57:29,729 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:57:29,730 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:57:33,027 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:57:33,030 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:57:33,030 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 103 [2019-09-03 20:57:33,030 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:57:33,031 INFO L454 AbstractCegarLoop]: Interpolant automaton has 55 states [2019-09-03 20:57:33,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2019-09-03 20:57:33,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3692, Invalid=6814, Unknown=0, NotChecked=0, Total=10506 [2019-09-03 20:57:33,033 INFO L87 Difference]: Start difference. First operand 108 states and 108 transitions. Second operand 55 states. [2019-09-03 20:57:33,444 WARN L188 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 9 [2019-09-03 20:57:33,583 WARN L188 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-03 20:57:39,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:57:39,129 INFO L93 Difference]: Finished difference Result 116 states and 116 transitions. [2019-09-03 20:57:39,134 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2019-09-03 20:57:39,134 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 107 [2019-09-03 20:57:39,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:57:39,135 INFO L225 Difference]: With dead ends: 116 [2019-09-03 20:57:39,136 INFO L226 Difference]: Without dead ends: 116 [2019-09-03 20:57:39,137 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 162 SyntacticMatches, 2 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1758 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=8753, Invalid=14809, Unknown=0, NotChecked=0, Total=23562 [2019-09-03 20:57:39,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2019-09-03 20:57:39,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2019-09-03 20:57:39,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2019-09-03 20:57:39,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 116 transitions. [2019-09-03 20:57:39,146 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 116 transitions. Word has length 107 [2019-09-03 20:57:39,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:57:39,146 INFO L475 AbstractCegarLoop]: Abstraction has 116 states and 116 transitions. [2019-09-03 20:57:39,147 INFO L476 AbstractCegarLoop]: Interpolant automaton has 55 states. [2019-09-03 20:57:39,147 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 116 transitions. [2019-09-03 20:57:39,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2019-09-03 20:57:39,149 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:57:39,150 INFO L399 BasicCegarLoop]: trace histogram [52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:57:39,150 INFO L418 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:57:39,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:57:39,150 INFO L82 PathProgramCache]: Analyzing trace with hash -177348201, now seen corresponding path program 14 times [2019-09-03 20:57:39,151 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:57:39,151 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:57:39,151 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:57:39,152 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:57:39,152 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:57:39,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:57:40,687 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:57:40,687 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:57:40,687 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:57:40,688 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:57:40,688 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:57:40,688 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:57:40,688 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 [2019-09-03 20:57:40,699 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-03 20:57:40,699 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-03 20:57:40,776 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 53 check-sat command(s) [2019-09-03 20:57:40,776 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:57:40,779 INFO L256 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 55 conjunts are in the unsatisfiable core [2019-09-03 20:57:40,782 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:57:40,979 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:57:40,979 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:57:44,840 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:57:44,843 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:57:44,844 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 111 [2019-09-03 20:57:44,844 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:57:44,844 INFO L454 AbstractCegarLoop]: Interpolant automaton has 59 states [2019-09-03 20:57:44,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2019-09-03 20:57:44,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4310, Invalid=7900, Unknown=0, NotChecked=0, Total=12210 [2019-09-03 20:57:44,845 INFO L87 Difference]: Start difference. First operand 116 states and 116 transitions. Second operand 59 states. [2019-09-03 20:57:45,038 WARN L188 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 8 [2019-09-03 20:57:45,167 WARN L188 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 8 [2019-09-03 20:57:45,314 WARN L188 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 9 [2019-09-03 20:57:45,454 WARN L188 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-03 20:57:45,608 WARN L188 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-03 20:57:45,752 WARN L188 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-03 20:57:45,901 WARN L188 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-03 20:57:46,054 WARN L188 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-03 20:57:46,206 WARN L188 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-03 20:57:46,508 WARN L188 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2019-09-03 20:57:52,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:57:52,152 INFO L93 Difference]: Finished difference Result 124 states and 124 transitions. [2019-09-03 20:57:52,153 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2019-09-03 20:57:52,153 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 115 [2019-09-03 20:57:52,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:57:52,154 INFO L225 Difference]: With dead ends: 124 [2019-09-03 20:57:52,154 INFO L226 Difference]: Without dead ends: 124 [2019-09-03 20:57:52,155 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 174 SyntacticMatches, 2 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2008 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=10207, Invalid=17183, Unknown=0, NotChecked=0, Total=27390 [2019-09-03 20:57:52,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2019-09-03 20:57:52,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2019-09-03 20:57:52,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2019-09-03 20:57:52,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 124 transitions. [2019-09-03 20:57:52,158 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 124 transitions. Word has length 115 [2019-09-03 20:57:52,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:57:52,159 INFO L475 AbstractCegarLoop]: Abstraction has 124 states and 124 transitions. [2019-09-03 20:57:52,159 INFO L476 AbstractCegarLoop]: Interpolant automaton has 59 states. [2019-09-03 20:57:52,159 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 124 transitions. [2019-09-03 20:57:52,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2019-09-03 20:57:52,160 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:57:52,161 INFO L399 BasicCegarLoop]: trace histogram [56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:57:52,161 INFO L418 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:57:52,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:57:52,161 INFO L82 PathProgramCache]: Analyzing trace with hash -549626993, now seen corresponding path program 15 times [2019-09-03 20:57:52,161 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:57:52,162 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:57:52,162 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:57:52,162 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:57:52,162 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:57:52,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:57:53,912 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:57:53,912 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:57:53,912 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:57:53,913 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:57:53,913 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:57:53,913 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:57:53,913 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 [2019-09-03 20:57:53,922 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-03 20:57:53,923 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-03 20:57:54,115 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 20:57:54,115 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:57:54,244 INFO L256 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 59 conjunts are in the unsatisfiable core [2019-09-03 20:57:54,246 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:57:54,456 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:57:54,456 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:57:58,887 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:57:58,890 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:57:58,890 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 119 [2019-09-03 20:57:58,890 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:57:58,890 INFO L454 AbstractCegarLoop]: Interpolant automaton has 63 states [2019-09-03 20:57:58,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2019-09-03 20:57:58,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4976, Invalid=9066, Unknown=0, NotChecked=0, Total=14042 [2019-09-03 20:57:58,892 INFO L87 Difference]: Start difference. First operand 124 states and 124 transitions. Second operand 63 states. [2019-09-03 20:57:59,093 WARN L188 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 168 DAG size of output: 8 [2019-09-03 20:57:59,233 WARN L188 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 8 [2019-09-03 20:57:59,389 WARN L188 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 9 [2019-09-03 20:57:59,549 WARN L188 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-03 20:57:59,711 WARN L188 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-03 20:57:59,878 WARN L188 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-03 20:58:00,044 WARN L188 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-03 20:58:00,218 WARN L188 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-03 20:58:00,390 WARN L188 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-03 20:58:00,564 WARN L188 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-03 20:58:00,739 WARN L188 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-03 20:58:00,909 WARN L188 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-03 20:58:01,075 WARN L188 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-03 20:58:01,253 WARN L188 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-03 20:58:01,422 WARN L188 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2019-09-03 20:58:07,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:58:07,568 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2019-09-03 20:58:07,568 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2019-09-03 20:58:07,568 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 123 [2019-09-03 20:58:07,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:58:07,569 INFO L225 Difference]: With dead ends: 132 [2019-09-03 20:58:07,569 INFO L226 Difference]: Without dead ends: 132 [2019-09-03 20:58:07,571 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 186 SyntacticMatches, 2 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2274 ImplicationChecksByTransitivity, 14.3s TimeCoverageRelationStatistics Valid=11773, Invalid=19733, Unknown=0, NotChecked=0, Total=31506 [2019-09-03 20:58:07,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2019-09-03 20:58:07,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2019-09-03 20:58:07,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2019-09-03 20:58:07,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 132 transitions. [2019-09-03 20:58:07,578 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 132 transitions. Word has length 123 [2019-09-03 20:58:07,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:58:07,579 INFO L475 AbstractCegarLoop]: Abstraction has 132 states and 132 transitions. [2019-09-03 20:58:07,579 INFO L476 AbstractCegarLoop]: Interpolant automaton has 63 states. [2019-09-03 20:58:07,579 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 132 transitions. [2019-09-03 20:58:07,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2019-09-03 20:58:07,580 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:58:07,581 INFO L399 BasicCegarLoop]: trace histogram [60, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:58:07,581 INFO L418 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:58:07,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:58:07,582 INFO L82 PathProgramCache]: Analyzing trace with hash -2066784889, now seen corresponding path program 16 times [2019-09-03 20:58:07,582 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:58:07,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:58:07,583 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:58:07,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:58:07,583 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:58:07,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:58:09,817 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:58:09,817 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:58:09,817 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:58:09,817 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:58:09,818 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:58:09,818 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:58:09,818 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 [2019-09-03 20:58:09,831 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:58:09,831 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-03 20:58:10,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:58:10,155 INFO L256 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 63 conjunts are in the unsatisfiable core [2019-09-03 20:58:10,157 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:58:10,389 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:58:10,389 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:58:15,606 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:58:15,609 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:58:15,609 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 127 [2019-09-03 20:58:15,609 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:58:15,610 INFO L454 AbstractCegarLoop]: Interpolant automaton has 67 states [2019-09-03 20:58:15,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2019-09-03 20:58:15,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5690, Invalid=10312, Unknown=0, NotChecked=0, Total=16002 [2019-09-03 20:58:15,611 INFO L87 Difference]: Start difference. First operand 132 states and 132 transitions. Second operand 67 states. [2019-09-03 20:58:15,846 WARN L188 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 180 DAG size of output: 8 [2019-09-03 20:58:15,998 WARN L188 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 8 [2019-09-03 20:58:16,171 WARN L188 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 189 DAG size of output: 9 [2019-09-03 20:58:16,356 WARN L188 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-03 20:58:16,537 WARN L188 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-03 20:58:16,725 WARN L188 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-03 20:58:16,908 WARN L188 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-03 20:58:17,088 WARN L188 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-03 20:58:17,272 WARN L188 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-03 20:58:17,461 WARN L188 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-03 20:58:17,657 WARN L188 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-03 20:58:17,851 WARN L188 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-03 20:58:18,040 WARN L188 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-03 20:58:18,226 WARN L188 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-03 20:58:18,414 WARN L188 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-03 20:58:18,599 WARN L188 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-03 20:58:18,784 WARN L188 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-03 20:58:18,979 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-03 20:58:19,358 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2019-09-03 20:58:25,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:58:25,773 INFO L93 Difference]: Finished difference Result 140 states and 140 transitions. [2019-09-03 20:58:25,773 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2019-09-03 20:58:25,773 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 131 [2019-09-03 20:58:25,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:58:25,774 INFO L225 Difference]: With dead ends: 140 [2019-09-03 20:58:25,774 INFO L226 Difference]: Without dead ends: 140 [2019-09-03 20:58:25,775 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 198 SyntacticMatches, 2 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2556 ImplicationChecksByTransitivity, 16.9s TimeCoverageRelationStatistics Valid=13451, Invalid=22459, Unknown=0, NotChecked=0, Total=35910 [2019-09-03 20:58:25,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2019-09-03 20:58:25,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 140. [2019-09-03 20:58:25,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2019-09-03 20:58:25,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 140 transitions. [2019-09-03 20:58:25,779 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 140 transitions. Word has length 131 [2019-09-03 20:58:25,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:58:25,779 INFO L475 AbstractCegarLoop]: Abstraction has 140 states and 140 transitions. [2019-09-03 20:58:25,779 INFO L476 AbstractCegarLoop]: Interpolant automaton has 67 states. [2019-09-03 20:58:25,779 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 140 transitions. [2019-09-03 20:58:25,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2019-09-03 20:58:25,780 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:58:25,780 INFO L399 BasicCegarLoop]: trace histogram [64, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:58:25,780 INFO L418 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:58:25,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:58:25,781 INFO L82 PathProgramCache]: Analyzing trace with hash 1595664255, now seen corresponding path program 17 times [2019-09-03 20:58:25,781 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:58:25,782 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:58:25,782 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:58:25,782 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:58:25,782 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:58:26,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:58:28,237 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 0 proven. 4096 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:58:28,237 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:58:28,237 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:58:28,237 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:58:28,237 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:58:28,237 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:58:28,238 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 [2019-09-03 20:58:28,248 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-03 20:58:28,248 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-03 20:58:28,344 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 65 check-sat command(s) [2019-09-03 20:58:28,344 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:58:28,347 INFO L256 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 67 conjunts are in the unsatisfiable core [2019-09-03 20:58:28,350 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:58:28,587 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 0 proven. 4096 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:58:28,587 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:58:34,222 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 0 proven. 4096 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:58:34,225 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:58:34,226 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 135 [2019-09-03 20:58:34,226 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:58:34,226 INFO L454 AbstractCegarLoop]: Interpolant automaton has 71 states [2019-09-03 20:58:34,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2019-09-03 20:58:34,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6452, Invalid=11638, Unknown=0, NotChecked=0, Total=18090 [2019-09-03 20:58:34,227 INFO L87 Difference]: Start difference. First operand 140 states and 140 transitions. Second operand 71 states. [2019-09-03 20:58:34,481 WARN L188 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 8 [2019-09-03 20:58:34,651 WARN L188 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 8 [2019-09-03 20:58:34,837 WARN L188 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 9 [2019-09-03 20:58:35,032 WARN L188 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-03 20:58:35,223 WARN L188 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-03 20:58:35,418 WARN L188 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-03 20:58:35,624 WARN L188 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-03 20:58:35,833 WARN L188 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-03 20:58:36,039 WARN L188 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-03 20:58:36,242 WARN L188 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-03 20:58:36,446 WARN L188 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-03 20:58:36,649 WARN L188 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-03 20:58:36,849 WARN L188 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-03 20:58:37,060 WARN L188 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-03 20:58:37,272 WARN L188 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-03 20:58:37,480 WARN L188 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-03 20:58:37,691 WARN L188 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-03 20:58:37,896 WARN L188 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-03 20:58:38,103 WARN L188 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-03 20:58:38,323 WARN L188 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-03 20:58:38,528 WARN L188 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-03 20:58:38,730 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-03 20:58:46,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:58:46,027 INFO L93 Difference]: Finished difference Result 148 states and 148 transitions. [2019-09-03 20:58:46,032 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2019-09-03 20:58:46,032 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 139 [2019-09-03 20:58:46,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:58:46,034 INFO L225 Difference]: With dead ends: 148 [2019-09-03 20:58:46,034 INFO L226 Difference]: Without dead ends: 148 [2019-09-03 20:58:46,036 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 [2019-09-03 20:58:46,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2019-09-03 20:58:46,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 148. [2019-09-03 20:58:46,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2019-09-03 20:58:46,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 148 transitions. [2019-09-03 20:58:46,041 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 148 transitions. Word has length 139 [2019-09-03 20:58:46,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:58:46,041 INFO L475 AbstractCegarLoop]: Abstraction has 148 states and 148 transitions. [2019-09-03 20:58:46,041 INFO L476 AbstractCegarLoop]: Interpolant automaton has 71 states. [2019-09-03 20:58:46,041 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 148 transitions. [2019-09-03 20:58:46,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2019-09-03 20:58:46,042 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:58:46,042 INFO L399 BasicCegarLoop]: trace histogram [68, 68, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:58:46,043 INFO L418 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:58:46,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:58:46,043 INFO L82 PathProgramCache]: Analyzing trace with hash 1864038775, now seen corresponding path program 18 times [2019-09-03 20:58:46,043 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:58:46,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:58:46,045 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:58:46,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:58:46,045 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:58:46,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:58:48,824 INFO L134 CoverageAnalysis]: Checked inductivity of 4624 backedges. 0 proven. 4624 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:58:48,824 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:58:48,824 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:58:48,824 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:58:48,824 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:58:48,824 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:58:48,825 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 [2019-09-03 20:58:48,835 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-03 20:58:48,836 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-03 20:58:48,925 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 20:58:48,925 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:58:48,953 INFO L256 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 71 conjunts are in the unsatisfiable core [2019-09-03 20:58:48,955 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:58:49,196 INFO L134 CoverageAnalysis]: Checked inductivity of 4624 backedges. 0 proven. 4624 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:58:49,196 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:58:55,653 INFO L134 CoverageAnalysis]: Checked inductivity of 4624 backedges. 0 proven. 4624 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:58:55,656 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:58:55,657 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 143 [2019-09-03 20:58:55,657 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:58:55,657 INFO L454 AbstractCegarLoop]: Interpolant automaton has 75 states [2019-09-03 20:58:55,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2019-09-03 20:58:55,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7262, Invalid=13044, Unknown=0, NotChecked=0, Total=20306 [2019-09-03 20:58:55,658 INFO L87 Difference]: Start difference. First operand 148 states and 148 transitions. Second operand 75 states. [2019-09-03 20:58:55,934 WARN L188 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 204 DAG size of output: 8 [2019-09-03 20:58:56,117 WARN L188 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 207 DAG size of output: 8 [2019-09-03 20:58:56,324 WARN L188 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 9 [2019-09-03 20:58:56,532 WARN L188 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-03 20:58:56,747 WARN L188 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-03 20:58:56,967 WARN L188 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-03 20:58:57,194 WARN L188 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-03 20:58:57,420 WARN L188 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-03 20:58:57,654 WARN L188 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-03 20:58:57,883 WARN L188 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-03 20:58:58,112 WARN L188 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-03 20:58:58,339 WARN L188 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-03 20:58:58,583 WARN L188 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-03 20:58:58,817 WARN L188 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-03 20:58:59,048 WARN L188 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-03 20:58:59,285 WARN L188 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-03 20:58:59,540 WARN L188 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-03 20:58:59,773 WARN L188 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-03 20:59:00,007 WARN L188 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-03 20:59:00,258 WARN L188 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-03 20:59:00,491 WARN L188 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-03 20:59:00,735 WARN L188 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-03 20:59:00,951 WARN L188 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-03 20:59:01,184 WARN L188 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-03 20:59:01,417 WARN L188 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-03 20:59:01,642 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-03 20:59:09,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:59:09,516 INFO L93 Difference]: Finished difference Result 156 states and 156 transitions. [2019-09-03 20:59:09,517 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2019-09-03 20:59:09,517 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 147 [2019-09-03 20:59:09,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:59:09,518 INFO L225 Difference]: With dead ends: 156 [2019-09-03 20:59:09,518 INFO L226 Difference]: Without dead ends: 156 [2019-09-03 20:59:09,520 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 436 GetRequests, 222 SyntacticMatches, 2 SemanticMatches, 212 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3168 ImplicationChecksByTransitivity, 22.1s TimeCoverageRelationStatistics Valid=17143, Invalid=28439, Unknown=0, NotChecked=0, Total=45582 [2019-09-03 20:59:09,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2019-09-03 20:59:09,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 156. [2019-09-03 20:59:09,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2019-09-03 20:59:09,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 156 transitions. [2019-09-03 20:59:09,523 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 156 transitions. Word has length 147 [2019-09-03 20:59:09,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:59:09,524 INFO L475 AbstractCegarLoop]: Abstraction has 156 states and 156 transitions. [2019-09-03 20:59:09,524 INFO L476 AbstractCegarLoop]: Interpolant automaton has 75 states. [2019-09-03 20:59:09,524 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 156 transitions. [2019-09-03 20:59:09,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2019-09-03 20:59:09,525 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:59:09,525 INFO L399 BasicCegarLoop]: trace histogram [72, 72, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:59:09,525 INFO L418 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:59:09,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:59:09,526 INFO L82 PathProgramCache]: Analyzing trace with hash 1036292975, now seen corresponding path program 19 times [2019-09-03 20:59:09,526 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:59:09,527 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:59:09,527 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 20:59:09,527 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:59:09,527 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:59:09,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:59:12,485 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 0 proven. 5184 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:59:12,485 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:59:12,485 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:59:12,485 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:59:12,486 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:59:12,486 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:59:12,486 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 [2019-09-03 20:59:12,495 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:59:12,495 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-03 20:59:12,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:59:13,044 INFO L256 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 75 conjunts are in the unsatisfiable core [2019-09-03 20:59:13,047 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:59:13,319 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 0 proven. 5184 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:59:13,319 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:59:20,428 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 0 proven. 5184 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:59:20,431 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:59:20,431 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 151 [2019-09-03 20:59:20,431 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:59:20,432 INFO L454 AbstractCegarLoop]: Interpolant automaton has 79 states [2019-09-03 20:59:20,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2019-09-03 20:59:20,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8120, Invalid=14530, Unknown=0, NotChecked=0, Total=22650 [2019-09-03 20:59:20,433 INFO L87 Difference]: Start difference. First operand 156 states and 156 transitions. Second operand 79 states. [2019-09-03 20:59:20,733 WARN L188 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 216 DAG size of output: 8 [2019-09-03 20:59:20,936 WARN L188 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 8 [2019-09-03 20:59:21,154 WARN L188 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 225 DAG size of output: 9 [2019-09-03 20:59:21,385 WARN L188 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-03 20:59:21,629 WARN L188 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-03 20:59:21,857 WARN L188 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-03 20:59:22,094 WARN L188 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-03 20:59:22,342 WARN L188 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-03 20:59:22,574 WARN L188 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-03 20:59:22,822 WARN L188 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-03 20:59:23,075 WARN L188 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-03 20:59:23,323 WARN L188 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-03 20:59:23,585 WARN L188 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-03 20:59:23,836 WARN L188 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-03 20:59:24,084 WARN L188 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-03 20:59:24,347 WARN L188 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-03 20:59:24,602 WARN L188 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-03 20:59:24,855 WARN L188 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-03 20:59:25,112 WARN L188 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-03 20:59:25,369 WARN L188 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-03 20:59:25,631 WARN L188 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-03 20:59:25,893 WARN L188 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-03 20:59:26,163 WARN L188 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-03 20:59:26,423 WARN L188 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-03 20:59:26,693 WARN L188 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-03 20:59:26,949 WARN L188 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-03 20:59:27,195 WARN L188 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-03 20:59:27,435 WARN L188 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-03 20:59:27,680 WARN L188 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-03 20:59:27,939 WARN L188 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-03 20:59:28,430 WARN L188 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2019-09-03 20:59:36,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 20:59:36,302 INFO L93 Difference]: Finished difference Result 164 states and 164 transitions. [2019-09-03 20:59:36,302 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2019-09-03 20:59:36,302 INFO L78 Accepts]: Start accepts. Automaton has 79 states. Word has length 155 [2019-09-03 20:59:36,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 20:59:36,303 INFO L225 Difference]: With dead ends: 164 [2019-09-03 20:59:36,303 INFO L226 Difference]: Without dead ends: 164 [2019-09-03 20:59:36,305 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 460 GetRequests, 234 SyntacticMatches, 2 SemanticMatches, 224 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3498 ImplicationChecksByTransitivity, 25.1s TimeCoverageRelationStatistics Valid=19157, Invalid=31693, Unknown=0, NotChecked=0, Total=50850 [2019-09-03 20:59:36,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2019-09-03 20:59:36,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 164. [2019-09-03 20:59:36,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2019-09-03 20:59:36,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 164 transitions. [2019-09-03 20:59:36,309 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 164 transitions. Word has length 155 [2019-09-03 20:59:36,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 20:59:36,310 INFO L475 AbstractCegarLoop]: Abstraction has 164 states and 164 transitions. [2019-09-03 20:59:36,310 INFO L476 AbstractCegarLoop]: Interpolant automaton has 79 states. [2019-09-03 20:59:36,310 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 164 transitions. [2019-09-03 20:59:36,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2019-09-03 20:59:36,311 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 20:59:36,311 INFO L399 BasicCegarLoop]: trace histogram [76, 76, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 20:59:36,311 INFO L418 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 20:59:36,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 20:59:36,312 INFO L82 PathProgramCache]: Analyzing trace with hash -602884761, now seen corresponding path program 20 times [2019-09-03 20:59:36,312 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 20:59:36,312 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:59:36,313 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 20:59:36,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 20:59:36,313 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 20:59:36,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 20:59:39,968 INFO L134 CoverageAnalysis]: Checked inductivity of 5776 backedges. 0 proven. 5776 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:59:39,968 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:59:39,968 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 20:59:39,968 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 20:59:39,968 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 20:59:39,969 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 20:59:39,969 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 [2019-09-03 20:59:40,001 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-03 20:59:40,002 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-03 20:59:40,111 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 77 check-sat command(s) [2019-09-03 20:59:40,112 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 20:59:40,117 INFO L256 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 79 conjunts are in the unsatisfiable core [2019-09-03 20:59:40,119 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 20:59:40,394 INFO L134 CoverageAnalysis]: Checked inductivity of 5776 backedges. 0 proven. 5776 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:59:40,395 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 20:59:48,252 INFO L134 CoverageAnalysis]: Checked inductivity of 5776 backedges. 0 proven. 5776 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 20:59:48,255 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 20:59:48,256 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80, 80] total 159 [2019-09-03 20:59:48,256 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 20:59:48,257 INFO L454 AbstractCegarLoop]: Interpolant automaton has 83 states [2019-09-03 20:59:48,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2019-09-03 20:59:48,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9026, Invalid=16096, Unknown=0, NotChecked=0, Total=25122 [2019-09-03 20:59:48,258 INFO L87 Difference]: Start difference. First operand 164 states and 164 transitions. Second operand 83 states. [2019-09-03 20:59:48,582 WARN L188 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 228 DAG size of output: 8 [2019-09-03 20:59:48,803 WARN L188 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 231 DAG size of output: 8 [2019-09-03 20:59:49,048 WARN L188 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 237 DAG size of output: 9 [2019-09-03 20:59:49,312 WARN L188 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-03 20:59:49,557 WARN L188 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-03 20:59:49,805 WARN L188 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-03 20:59:50,062 WARN L188 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-03 20:59:50,323 WARN L188 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-03 20:59:50,584 WARN L188 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-03 20:59:50,848 WARN L188 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-03 20:59:51,122 WARN L188 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-03 20:59:51,388 WARN L188 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-03 20:59:51,649 WARN L188 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-03 20:59:51,912 WARN L188 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-03 20:59:52,182 WARN L188 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-03 20:59:52,463 WARN L188 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-03 20:59:52,730 WARN L188 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-03 20:59:53,006 WARN L188 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-03 20:59:53,286 WARN L188 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-03 20:59:53,575 WARN L188 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-03 20:59:53,856 WARN L188 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-03 20:59:54,132 WARN L188 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-03 20:59:54,412 WARN L188 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-03 20:59:54,694 WARN L188 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-03 20:59:54,976 WARN L188 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-03 20:59:55,252 WARN L188 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-03 20:59:55,529 WARN L188 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-03 20:59:55,803 WARN L188 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-03 20:59:56,094 WARN L188 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-03 20:59:56,356 WARN L188 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-03 20:59:56,629 WARN L188 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-03 20:59:56,898 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-03 20:59:57,152 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-03 20:59:57,418 WARN L188 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-03 21:00:06,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 21:00:06,338 INFO L93 Difference]: Finished difference Result 172 states and 172 transitions. [2019-09-03 21:00:06,340 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2019-09-03 21:00:06,340 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 163 [2019-09-03 21:00:06,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 21:00:06,341 INFO L225 Difference]: With dead ends: 172 [2019-09-03 21:00:06,342 INFO L226 Difference]: Without dead ends: 172 [2019-09-03 21:00:06,343 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 246 SyntacticMatches, 2 SemanticMatches, 236 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3844 ImplicationChecksByTransitivity, 28.7s TimeCoverageRelationStatistics Valid=21283, Invalid=35123, Unknown=0, NotChecked=0, Total=56406 [2019-09-03 21:00:06,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2019-09-03 21:00:06,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 172. [2019-09-03 21:00:06,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2019-09-03 21:00:06,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 172 transitions. [2019-09-03 21:00:06,346 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 172 transitions. Word has length 163 [2019-09-03 21:00:06,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 21:00:06,347 INFO L475 AbstractCegarLoop]: Abstraction has 172 states and 172 transitions. [2019-09-03 21:00:06,347 INFO L476 AbstractCegarLoop]: Interpolant automaton has 83 states. [2019-09-03 21:00:06,347 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 172 transitions. [2019-09-03 21:00:06,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2019-09-03 21:00:06,348 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 21:00:06,348 INFO L399 BasicCegarLoop]: trace histogram [80, 80, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 21:00:06,348 INFO L418 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 21:00:06,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:00:06,349 INFO L82 PathProgramCache]: Analyzing trace with hash -487104673, now seen corresponding path program 21 times [2019-09-03 21:00:06,349 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 21:00:06,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:00:06,350 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 21:00:06,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:00:06,350 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 21:00:06,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:00:10,099 INFO L134 CoverageAnalysis]: Checked inductivity of 6400 backedges. 0 proven. 6400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:00:10,100 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:00:10,100 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 21:00:10,100 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 21:00:10,100 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 21:00:10,100 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:00:10,100 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 [2019-09-03 21:00:10,110 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-03 21:00:10,110 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-03 21:00:10,329 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 21:00:10,329 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 21:00:10,438 INFO L256 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 83 conjunts are in the unsatisfiable core [2019-09-03 21:00:10,440 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 21:00:10,797 INFO L134 CoverageAnalysis]: Checked inductivity of 6400 backedges. 0 proven. 6400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:00:10,797 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 21:00:19,444 INFO L134 CoverageAnalysis]: Checked inductivity of 6400 backedges. 0 proven. 6400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:00:19,447 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 21:00:19,448 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84, 84] total 167 [2019-09-03 21:00:19,448 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 21:00:19,448 INFO L454 AbstractCegarLoop]: Interpolant automaton has 87 states [2019-09-03 21:00:19,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2019-09-03 21:00:19,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9980, Invalid=17742, Unknown=0, NotChecked=0, Total=27722 [2019-09-03 21:00:19,450 INFO L87 Difference]: Start difference. First operand 172 states and 172 transitions. Second operand 87 states. [2019-09-03 21:00:19,804 WARN L188 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 240 DAG size of output: 8 [2019-09-03 21:00:20,038 WARN L188 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 243 DAG size of output: 8 [2019-09-03 21:00:20,302 WARN L188 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 249 DAG size of output: 9 [2019-09-03 21:00:20,563 WARN L188 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-03 21:00:20,845 WARN L188 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-03 21:00:21,116 WARN L188 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-03 21:00:21,388 WARN L188 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-03 21:00:21,680 WARN L188 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-03 21:00:21,954 WARN L188 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-03 21:00:22,239 WARN L188 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-03 21:00:22,532 WARN L188 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-03 21:00:22,815 WARN L188 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-03 21:00:23,102 WARN L188 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-03 21:00:23,396 WARN L188 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-03 21:00:23,709 WARN L188 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-03 21:00:23,998 WARN L188 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-03 21:00:24,296 WARN L188 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-03 21:00:24,582 WARN L188 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-03 21:00:24,858 WARN L188 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-03 21:00:25,154 WARN L188 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-03 21:00:25,453 WARN L188 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-03 21:00:25,767 WARN L188 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-03 21:00:26,082 WARN L188 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-03 21:00:26,377 WARN L188 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-03 21:00:26,682 WARN L188 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-03 21:00:26,990 WARN L188 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-03 21:00:27,284 WARN L188 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-03 21:00:27,591 WARN L188 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-03 21:00:27,883 WARN L188 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-03 21:00:28,190 WARN L188 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-03 21:00:28,487 WARN L188 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-03 21:00:28,798 WARN L188 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-03 21:00:29,080 WARN L188 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-03 21:00:29,379 WARN L188 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-03 21:00:29,670 WARN L188 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-03 21:00:29,946 WARN L188 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-03 21:00:30,217 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-03 21:00:31,322 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 11 [2019-09-03 21:00:39,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 21:00:39,980 INFO L93 Difference]: Finished difference Result 180 states and 180 transitions. [2019-09-03 21:00:39,980 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2019-09-03 21:00:39,981 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 171 [2019-09-03 21:00:39,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 21:00:39,982 INFO L225 Difference]: With dead ends: 180 [2019-09-03 21:00:39,982 INFO L226 Difference]: Without dead ends: 180 [2019-09-03 21:00:39,984 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 508 GetRequests, 258 SyntacticMatches, 2 SemanticMatches, 248 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4206 ImplicationChecksByTransitivity, 31.8s TimeCoverageRelationStatistics Valid=23521, Invalid=38729, Unknown=0, NotChecked=0, Total=62250 [2019-09-03 21:00:39,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2019-09-03 21:00:39,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 180. [2019-09-03 21:00:39,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2019-09-03 21:00:39,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 180 transitions. [2019-09-03 21:00:39,988 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 180 transitions. Word has length 171 [2019-09-03 21:00:39,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 21:00:39,988 INFO L475 AbstractCegarLoop]: Abstraction has 180 states and 180 transitions. [2019-09-03 21:00:39,988 INFO L476 AbstractCegarLoop]: Interpolant automaton has 87 states. [2019-09-03 21:00:39,988 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 180 transitions. [2019-09-03 21:00:39,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2019-09-03 21:00:39,989 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 21:00:39,989 INFO L399 BasicCegarLoop]: trace histogram [84, 84, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 21:00:39,990 INFO L418 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 21:00:39,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:00:39,990 INFO L82 PathProgramCache]: Analyzing trace with hash 1936757079, now seen corresponding path program 22 times [2019-09-03 21:00:39,990 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 21:00:39,991 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:00:39,991 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 21:00:39,991 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:00:39,991 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 21:00:40,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:00:44,186 INFO L134 CoverageAnalysis]: Checked inductivity of 7056 backedges. 0 proven. 7056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:00:44,187 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:00:44,187 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 21:00:44,187 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 21:00:44,187 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 21:00:44,187 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:00:44,187 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 [2019-09-03 21:00:44,197 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:00:44,197 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-03 21:00:44,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:00:45,071 INFO L256 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 87 conjunts are in the unsatisfiable core [2019-09-03 21:00:45,073 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 21:00:45,385 INFO L134 CoverageAnalysis]: Checked inductivity of 7056 backedges. 0 proven. 7056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:00:45,385 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 21:00:54,948 INFO L134 CoverageAnalysis]: Checked inductivity of 7056 backedges. 0 proven. 7056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:00:54,951 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 21:00:54,951 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88, 88] total 175 [2019-09-03 21:00:54,951 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 21:00:54,952 INFO L454 AbstractCegarLoop]: Interpolant automaton has 91 states [2019-09-03 21:00:54,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2019-09-03 21:00:54,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10982, Invalid=19468, Unknown=0, NotChecked=0, Total=30450 [2019-09-03 21:00:54,953 INFO L87 Difference]: Start difference. First operand 180 states and 180 transitions. Second operand 91 states. [2019-09-03 21:00:55,320 WARN L188 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 252 DAG size of output: 8 [2019-09-03 21:00:55,574 WARN L188 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 255 DAG size of output: 8 [2019-09-03 21:00:55,859 WARN L188 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 261 DAG size of output: 9 [2019-09-03 21:00:56,140 WARN L188 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-03 21:00:56,438 WARN L188 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-03 21:00:56,731 WARN L188 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-03 21:00:57,037 WARN L188 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-03 21:00:57,340 WARN L188 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-03 21:00:57,650 WARN L188 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-03 21:00:57,966 WARN L188 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-03 21:00:58,272 WARN L188 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-03 21:00:58,591 WARN L188 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-03 21:00:58,907 WARN L188 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-03 21:00:59,220 WARN L188 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-03 21:00:59,539 WARN L188 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-03 21:00:59,875 WARN L188 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-03 21:01:00,192 WARN L188 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-03 21:01:00,510 WARN L188 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-03 21:01:00,828 WARN L188 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-03 21:01:01,150 WARN L188 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-03 21:01:01,486 WARN L188 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-03 21:01:01,803 WARN L188 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-03 21:01:02,126 WARN L188 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-03 21:01:02,445 WARN L188 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-03 21:01:02,773 WARN L188 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-03 21:01:03,093 WARN L188 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-03 21:01:03,434 WARN L188 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-03 21:01:03,749 WARN L188 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-03 21:01:04,075 WARN L188 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-03 21:01:04,399 WARN L188 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-03 21:01:04,716 WARN L188 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-03 21:01:05,049 WARN L188 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-03 21:01:05,371 WARN L188 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-03 21:01:05,691 WARN L188 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-03 21:01:06,002 WARN L188 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-03 21:01:06,321 WARN L188 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-03 21:01:06,637 WARN L188 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-03 21:01:06,933 WARN L188 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-03 21:01:07,239 WARN L188 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-03 21:01:07,543 WARN L188 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-03 21:01:07,833 WARN L188 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-03 21:01:08,126 WARN L188 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-03 21:01:18,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 21:01:18,105 INFO L93 Difference]: Finished difference Result 188 states and 188 transitions. [2019-09-03 21:01:18,105 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2019-09-03 21:01:18,105 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 179 [2019-09-03 21:01:18,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 21:01:18,107 INFO L225 Difference]: With dead ends: 188 [2019-09-03 21:01:18,107 INFO L226 Difference]: Without dead ends: 188 [2019-09-03 21:01:18,109 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 532 GetRequests, 270 SyntacticMatches, 2 SemanticMatches, 260 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4584 ImplicationChecksByTransitivity, 35.5s TimeCoverageRelationStatistics Valid=25871, Invalid=42511, Unknown=0, NotChecked=0, Total=68382 [2019-09-03 21:01:18,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2019-09-03 21:01:18,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 188. [2019-09-03 21:01:18,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2019-09-03 21:01:18,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 188 transitions. [2019-09-03 21:01:18,114 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 188 transitions. Word has length 179 [2019-09-03 21:01:18,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 21:01:18,114 INFO L475 AbstractCegarLoop]: Abstraction has 188 states and 188 transitions. [2019-09-03 21:01:18,114 INFO L476 AbstractCegarLoop]: Interpolant automaton has 91 states. [2019-09-03 21:01:18,114 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 188 transitions. [2019-09-03 21:01:18,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2019-09-03 21:01:18,115 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 21:01:18,115 INFO L399 BasicCegarLoop]: trace histogram [88, 88, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 21:01:18,116 INFO L418 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 21:01:18,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:01:18,116 INFO L82 PathProgramCache]: Analyzing trace with hash 913591119, now seen corresponding path program 23 times [2019-09-03 21:01:18,116 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 21:01:18,117 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:01:18,117 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:01:18,117 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:01:18,117 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 21:01:18,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:01:22,437 INFO L134 CoverageAnalysis]: Checked inductivity of 7744 backedges. 0 proven. 7744 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:01:22,438 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:01:22,438 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 21:01:22,438 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 21:01:22,438 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 21:01:22,438 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:01:22,438 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 [2019-09-03 21:01:22,449 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-03 21:01:22,449 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-03 21:01:22,585 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 89 check-sat command(s) [2019-09-03 21:01:22,585 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 21:01:22,591 INFO L256 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 91 conjunts are in the unsatisfiable core [2019-09-03 21:01:22,594 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 21:01:22,895 INFO L134 CoverageAnalysis]: Checked inductivity of 7744 backedges. 0 proven. 7744 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:01:22,895 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 21:01:33,400 INFO L134 CoverageAnalysis]: Checked inductivity of 7744 backedges. 0 proven. 7744 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:01:33,404 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 21:01:33,404 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92, 92] total 183 [2019-09-03 21:01:33,404 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 21:01:33,404 INFO L454 AbstractCegarLoop]: Interpolant automaton has 95 states [2019-09-03 21:01:33,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2019-09-03 21:01:33,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12032, Invalid=21274, Unknown=0, NotChecked=0, Total=33306 [2019-09-03 21:01:33,408 INFO L87 Difference]: Start difference. First operand 188 states and 188 transitions. Second operand 95 states. [2019-09-03 21:01:33,815 WARN L188 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 264 DAG size of output: 8 [2019-09-03 21:01:34,088 WARN L188 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 267 DAG size of output: 8 [2019-09-03 21:01:34,396 WARN L188 SmtUtils]: Spent 284.00 ms on a formula simplification. DAG size of input: 273 DAG size of output: 9 [2019-09-03 21:01:34,706 WARN L188 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2019-09-03 21:01:35,013 WARN L188 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2019-09-03 21:01:35,351 WARN L188 SmtUtils]: Spent 289.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2019-09-03 21:01:35,672 WARN L188 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2019-09-03 21:01:35,994 WARN L188 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-03 21:01:36,318 WARN L188 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-03 21:01:36,652 WARN L188 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-03 21:01:36,991 WARN L188 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-03 21:01:37,329 WARN L188 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-03 21:01:37,668 WARN L188 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-03 21:01:38,005 WARN L188 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-03 21:01:38,338 WARN L188 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-03 21:01:38,694 WARN L188 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-03 21:01:39,025 WARN L188 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-03 21:01:39,369 WARN L188 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-03 21:01:39,706 WARN L188 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-03 21:01:40,055 WARN L188 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-03 21:01:40,399 WARN L188 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-03 21:01:40,751 WARN L188 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-03 21:01:41,093 WARN L188 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-03 21:01:41,439 WARN L188 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-03 21:01:41,786 WARN L188 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-03 21:01:42,143 WARN L188 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-03 21:01:42,489 WARN L188 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-03 21:01:42,847 WARN L188 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-03 21:01:43,196 WARN L188 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-03 21:01:43,541 WARN L188 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-03 21:01:43,894 WARN L188 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-03 21:01:44,245 WARN L188 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-03 21:01:44,580 WARN L188 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-03 21:01:44,928 WARN L188 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-03 21:01:45,265 WARN L188 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-03 21:01:45,601 WARN L188 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-03 21:01:45,938 WARN L188 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-03 21:01:46,283 WARN L188 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-03 21:01:46,613 WARN L188 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-03 21:01:46,947 WARN L188 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-03 21:01:47,297 WARN L188 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-03 21:01:47,625 WARN L188 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-03 21:01:47,933 WARN L188 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-03 21:01:48,259 WARN L188 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-03 21:01:48,594 WARN L188 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-03 21:01:48,918 WARN L188 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-03 21:01:49,232 WARN L188 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2019-09-03 21:01:49,563 WARN L188 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2019-09-03 21:01:59,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 21:01:59,528 INFO L93 Difference]: Finished difference Result 196 states and 196 transitions. [2019-09-03 21:01:59,528 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2019-09-03 21:01:59,528 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 187 [2019-09-03 21:01:59,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 21:01:59,530 INFO L225 Difference]: With dead ends: 196 [2019-09-03 21:01:59,530 INFO L226 Difference]: Without dead ends: 196 [2019-09-03 21:01:59,533 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 [2019-09-03 21:01:59,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2019-09-03 21:01:59,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2019-09-03 21:01:59,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2019-09-03 21:01:59,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 196 transitions. [2019-09-03 21:01:59,537 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 196 transitions. Word has length 187 [2019-09-03 21:01:59,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 21:01:59,537 INFO L475 AbstractCegarLoop]: Abstraction has 196 states and 196 transitions. [2019-09-03 21:01:59,538 INFO L476 AbstractCegarLoop]: Interpolant automaton has 95 states. [2019-09-03 21:01:59,538 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 196 transitions. [2019-09-03 21:01:59,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2019-09-03 21:01:59,539 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 21:01:59,539 INFO L399 BasicCegarLoop]: trace histogram [92, 92, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 21:01:59,539 INFO L418 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 21:01:59,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:01:59,540 INFO L82 PathProgramCache]: Analyzing trace with hash 1559924039, now seen corresponding path program 24 times [2019-09-03 21:01:59,540 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 21:01:59,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:01:59,541 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 21:01:59,541 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:01:59,541 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 21:02:00,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:02:04,278 INFO L134 CoverageAnalysis]: Checked inductivity of 8464 backedges. 0 proven. 8464 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:02:04,278 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:02:04,278 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 21:02:04,278 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 21:02:04,278 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 21:02:04,278 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:02:04,278 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 [2019-09-03 21:02:04,289 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-03 21:02:04,290 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-03 21:02:04,757 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 21:02:04,758 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 21:02:04,998 INFO L256 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 95 conjunts are in the unsatisfiable core [2019-09-03 21:02:05,001 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 21:02:05,510 INFO L134 CoverageAnalysis]: Checked inductivity of 8464 backedges. 0 proven. 8464 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:02:05,511 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 21:02:17,124 INFO L134 CoverageAnalysis]: Checked inductivity of 8464 backedges. 0 proven. 8464 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:02:17,128 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 21:02:17,128 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96, 96] total 191 [2019-09-03 21:02:17,128 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 21:02:17,129 INFO L454 AbstractCegarLoop]: Interpolant automaton has 99 states [2019-09-03 21:02:17,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2019-09-03 21:02:17,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13130, Invalid=23160, Unknown=0, NotChecked=0, Total=36290 [2019-09-03 21:02:17,130 INFO L87 Difference]: Start difference. First operand 196 states and 196 transitions. Second operand 99 states. [2019-09-03 21:02:17,542 WARN L188 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 276 DAG size of output: 8 [2019-09-03 21:02:17,837 WARN L188 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 279 DAG size of output: 8 [2019-09-03 21:02:18,177 WARN L188 SmtUtils]: Spent 317.00 ms on a formula simplification. DAG size of input: 285 DAG size of output: 9 [2019-09-03 21:02:18,509 WARN L188 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2019-09-03 21:02:18,848 WARN L188 SmtUtils]: Spent 292.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2019-09-03 21:02:19,190 WARN L188 SmtUtils]: Spent 287.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2019-09-03 21:02:19,529 WARN L188 SmtUtils]: Spent 278.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2019-09-03 21:02:19,888 WARN L188 SmtUtils]: Spent 292.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2019-09-03 21:02:20,234 WARN L188 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2019-09-03 21:02:20,592 WARN L188 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2019-09-03 21:02:20,954 WARN L188 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2019-09-03 21:02:21,324 WARN L188 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-03 21:02:21,691 WARN L188 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-03 21:02:22,061 WARN L188 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-03 21:02:22,418 WARN L188 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-03 21:02:22,785 WARN L188 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-03 21:02:23,156 WARN L188 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-03 21:02:23,521 WARN L188 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-03 21:02:23,884 WARN L188 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-03 21:02:24,266 WARN L188 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-03 21:02:24,639 WARN L188 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-03 21:02:25,010 WARN L188 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-03 21:02:25,393 WARN L188 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-03 21:02:25,771 WARN L188 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-03 21:02:26,144 WARN L188 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-03 21:02:26,515 WARN L188 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-03 21:02:26,878 WARN L188 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-03 21:02:27,251 WARN L188 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-03 21:02:27,625 WARN L188 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-03 21:02:27,988 WARN L188 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-03 21:02:28,350 WARN L188 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-03 21:02:28,718 WARN L188 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-03 21:02:29,088 WARN L188 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-03 21:02:29,455 WARN L188 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-03 21:02:29,823 WARN L188 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-03 21:02:30,182 WARN L188 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-03 21:02:30,555 WARN L188 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-03 21:02:30,920 WARN L188 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-03 21:02:31,297 WARN L188 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-03 21:02:31,673 WARN L188 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-03 21:02:32,032 WARN L188 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-03 21:02:32,392 WARN L188 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-03 21:02:32,748 WARN L188 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-03 21:02:33,112 WARN L188 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-03 21:02:33,461 WARN L188 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-03 21:02:33,818 WARN L188 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-03 21:02:34,164 WARN L188 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-03 21:02:34,503 WARN L188 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-03 21:02:34,846 WARN L188 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-03 21:02:35,185 WARN L188 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-03 21:02:35,526 WARN L188 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2019-09-03 21:02:35,869 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2019-09-03 21:02:46,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 21:02:46,155 INFO L93 Difference]: Finished difference Result 204 states and 204 transitions. [2019-09-03 21:02:46,155 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2019-09-03 21:02:46,155 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 195 [2019-09-03 21:02:46,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 21:02:46,157 INFO L225 Difference]: With dead ends: 204 [2019-09-03 21:02:46,157 INFO L226 Difference]: Without dead ends: 204 [2019-09-03 21:02:46,160 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 580 GetRequests, 294 SyntacticMatches, 2 SemanticMatches, 284 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5388 ImplicationChecksByTransitivity, 44.1s TimeCoverageRelationStatistics Valid=30907, Invalid=50603, Unknown=0, NotChecked=0, Total=81510 [2019-09-03 21:02:46,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2019-09-03 21:02:46,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 204. [2019-09-03 21:02:46,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2019-09-03 21:02:46,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 204 transitions. [2019-09-03 21:02:46,164 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 204 transitions. Word has length 195 [2019-09-03 21:02:46,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 21:02:46,165 INFO L475 AbstractCegarLoop]: Abstraction has 204 states and 204 transitions. [2019-09-03 21:02:46,165 INFO L476 AbstractCegarLoop]: Interpolant automaton has 99 states. [2019-09-03 21:02:46,165 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 204 transitions. [2019-09-03 21:02:46,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2019-09-03 21:02:46,166 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 21:02:46,166 INFO L399 BasicCegarLoop]: trace histogram [96, 96, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 21:02:46,166 INFO L418 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 21:02:46,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:02:46,167 INFO L82 PathProgramCache]: Analyzing trace with hash -1610918081, now seen corresponding path program 25 times [2019-09-03 21:02:46,167 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 21:02:46,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:02:46,168 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 21:02:46,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:02:46,168 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 21:02:46,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:02:51,222 INFO L134 CoverageAnalysis]: Checked inductivity of 9216 backedges. 0 proven. 9216 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:02:51,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:02:51,223 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 21:02:51,223 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 21:02:51,223 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 21:02:51,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:02:51,223 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 [2019-09-03 21:02:51,234 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:02:51,234 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-03 21:02:52,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:02:52,630 INFO L256 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 99 conjunts are in the unsatisfiable core [2019-09-03 21:02:52,633 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 21:02:52,973 INFO L134 CoverageAnalysis]: Checked inductivity of 9216 backedges. 0 proven. 9216 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:02:52,973 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 21:03:05,362 INFO L134 CoverageAnalysis]: Checked inductivity of 9216 backedges. 0 proven. 9216 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:03:05,366 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 21:03:05,366 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 100, 100] total 199 [2019-09-03 21:03:05,366 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 21:03:05,367 INFO L454 AbstractCegarLoop]: Interpolant automaton has 103 states [2019-09-03 21:03:05,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2019-09-03 21:03:05,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14276, Invalid=25126, Unknown=0, NotChecked=0, Total=39402 [2019-09-03 21:03:05,369 INFO L87 Difference]: Start difference. First operand 204 states and 204 transitions. Second operand 103 states. [2019-09-03 21:03:05,848 WARN L188 SmtUtils]: Spent 318.00 ms on a formula simplification. DAG size of input: 288 DAG size of output: 8 [2019-09-03 21:03:06,175 WARN L188 SmtUtils]: Spent 306.00 ms on a formula simplification. DAG size of input: 291 DAG size of output: 8 [2019-09-03 21:03:06,531 WARN L188 SmtUtils]: Spent 331.00 ms on a formula simplification. DAG size of input: 297 DAG size of output: 9 [2019-09-03 21:03:06,880 WARN L188 SmtUtils]: Spent 313.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2019-09-03 21:03:07,238 WARN L188 SmtUtils]: Spent 311.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2019-09-03 21:03:07,607 WARN L188 SmtUtils]: Spent 318.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2019-09-03 21:03:07,973 WARN L188 SmtUtils]: Spent 304.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2019-09-03 21:03:08,348 WARN L188 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2019-09-03 21:03:08,716 WARN L188 SmtUtils]: Spent 292.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2019-09-03 21:03:09,097 WARN L188 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2019-09-03 21:03:09,478 WARN L188 SmtUtils]: Spent 284.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2019-09-03 21:03:09,877 WARN L188 SmtUtils]: Spent 295.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2019-09-03 21:03:10,265 WARN L188 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2019-09-03 21:03:10,641 WARN L188 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2019-09-03 21:03:11,034 WARN L188 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2019-09-03 21:03:11,437 WARN L188 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-03 21:03:11,826 WARN L188 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-03 21:03:12,254 WARN L188 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-03 21:03:12,669 WARN L188 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-03 21:03:13,078 WARN L188 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-03 21:03:13,474 WARN L188 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-03 21:03:13,875 WARN L188 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-03 21:03:14,273 WARN L188 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-03 21:03:14,665 WARN L188 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-03 21:03:15,061 WARN L188 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-03 21:03:15,483 WARN L188 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-03 21:03:15,880 WARN L188 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-03 21:03:16,288 WARN L188 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-03 21:03:16,670 WARN L188 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-03 21:03:17,054 WARN L188 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-03 21:03:17,448 WARN L188 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-03 21:03:17,839 WARN L188 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-03 21:03:18,231 WARN L188 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-03 21:03:18,639 WARN L188 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-03 21:03:19,026 WARN L188 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-03 21:03:19,415 WARN L188 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-03 21:03:19,806 WARN L188 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-03 21:03:20,200 WARN L188 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-03 21:03:20,584 WARN L188 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-03 21:03:20,974 WARN L188 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-03 21:03:21,374 WARN L188 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-03 21:03:21,765 WARN L188 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-03 21:03:22,161 WARN L188 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-03 21:03:22,551 WARN L188 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-03 21:03:22,926 WARN L188 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-03 21:03:23,313 WARN L188 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-03 21:03:23,697 WARN L188 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-03 21:03:24,086 WARN L188 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-03 21:03:24,472 WARN L188 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-03 21:03:24,835 WARN L188 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-03 21:03:25,196 WARN L188 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-03 21:03:25,552 WARN L188 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-03 21:03:25,912 WARN L188 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-03 21:03:26,278 WARN L188 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-03 21:03:26,644 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2019-09-03 21:03:38,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 21:03:38,022 INFO L93 Difference]: Finished difference Result 212 states and 212 transitions. [2019-09-03 21:03:38,023 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2019-09-03 21:03:38,023 INFO L78 Accepts]: Start accepts. Automaton has 103 states. Word has length 203 [2019-09-03 21:03:38,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 21:03:38,024 INFO L225 Difference]: With dead ends: 212 [2019-09-03 21:03:38,024 INFO L226 Difference]: Without dead ends: 212 [2019-09-03 21:03:38,026 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 604 GetRequests, 306 SyntacticMatches, 2 SemanticMatches, 296 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5814 ImplicationChecksByTransitivity, 48.7s TimeCoverageRelationStatistics Valid=33593, Invalid=54913, Unknown=0, NotChecked=0, Total=88506 [2019-09-03 21:03:38,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2019-09-03 21:03:38,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 212. [2019-09-03 21:03:38,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 212 states. [2019-09-03 21:03:38,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 212 transitions. [2019-09-03 21:03:38,031 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 212 transitions. Word has length 203 [2019-09-03 21:03:38,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 21:03:38,031 INFO L475 AbstractCegarLoop]: Abstraction has 212 states and 212 transitions. [2019-09-03 21:03:38,032 INFO L476 AbstractCegarLoop]: Interpolant automaton has 103 states. [2019-09-03 21:03:38,032 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 212 transitions. [2019-09-03 21:03:38,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 212 [2019-09-03 21:03:38,033 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 21:03:38,033 INFO L399 BasicCegarLoop]: trace histogram [100, 100, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 21:03:38,033 INFO L418 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 21:03:38,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:03:38,034 INFO L82 PathProgramCache]: Analyzing trace with hash 1080994103, now seen corresponding path program 26 times [2019-09-03 21:03:38,034 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 21:03:38,034 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:03:38,035 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:03:38,035 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:03:38,035 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 21:03:38,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:03:43,979 INFO L134 CoverageAnalysis]: Checked inductivity of 10000 backedges. 0 proven. 10000 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:03:43,980 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:03:43,980 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 21:03:43,980 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 21:03:43,980 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 21:03:43,980 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:03:43,980 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 [2019-09-03 21:03:43,990 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-03 21:03:43,990 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-03 21:03:44,153 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 101 check-sat command(s) [2019-09-03 21:03:44,153 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 21:03:44,158 INFO L256 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 103 conjunts are in the unsatisfiable core [2019-09-03 21:03:44,161 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 21:03:44,513 INFO L134 CoverageAnalysis]: Checked inductivity of 10000 backedges. 0 proven. 10000 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:03:44,513 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 21:03:57,872 INFO L134 CoverageAnalysis]: Checked inductivity of 10000 backedges. 0 proven. 10000 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:03:57,876 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 21:03:57,876 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [104, 104, 104] total 207 [2019-09-03 21:03:57,876 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 21:03:57,877 INFO L454 AbstractCegarLoop]: Interpolant automaton has 107 states [2019-09-03 21:03:57,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2019-09-03 21:03:57,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15470, Invalid=27172, Unknown=0, NotChecked=0, Total=42642 [2019-09-03 21:03:57,878 INFO L87 Difference]: Start difference. First operand 212 states and 212 transitions. Second operand 107 states. [2019-09-03 21:03:58,345 WARN L188 SmtUtils]: Spent 318.00 ms on a formula simplification. DAG size of input: 300 DAG size of output: 8 [2019-09-03 21:03:58,716 WARN L188 SmtUtils]: Spent 346.00 ms on a formula simplification. DAG size of input: 303 DAG size of output: 8 [2019-09-03 21:03:59,079 WARN L188 SmtUtils]: Spent 338.00 ms on a formula simplification. DAG size of input: 309 DAG size of output: 9 [2019-09-03 21:03:59,452 WARN L188 SmtUtils]: Spent 335.00 ms on a formula simplification. DAG size of input: 308 DAG size of output: 11 [2019-09-03 21:03:59,827 WARN L188 SmtUtils]: Spent 334.00 ms on a formula simplification. DAG size of input: 305 DAG size of output: 11 [2019-09-03 21:04:00,208 WARN L188 SmtUtils]: Spent 329.00 ms on a formula simplification. DAG size of input: 302 DAG size of output: 11 [2019-09-03 21:04:00,595 WARN L188 SmtUtils]: Spent 326.00 ms on a formula simplification. DAG size of input: 299 DAG size of output: 11 [2019-09-03 21:04:00,991 WARN L188 SmtUtils]: Spent 324.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2019-09-03 21:04:01,408 WARN L188 SmtUtils]: Spent 336.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2019-09-03 21:04:01,809 WARN L188 SmtUtils]: Spent 310.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2019-09-03 21:04:02,219 WARN L188 SmtUtils]: Spent 313.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2019-09-03 21:04:02,617 WARN L188 SmtUtils]: Spent 297.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2019-09-03 21:04:03,030 WARN L188 SmtUtils]: Spent 296.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2019-09-03 21:04:03,446 WARN L188 SmtUtils]: Spent 296.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2019-09-03 21:04:03,859 WARN L188 SmtUtils]: Spent 285.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2019-09-03 21:04:04,293 WARN L188 SmtUtils]: Spent 296.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2019-09-03 21:04:04,706 WARN L188 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2019-09-03 21:04:05,123 WARN L188 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2019-09-03 21:04:05,543 WARN L188 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2019-09-03 21:04:05,971 WARN L188 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-03 21:04:06,403 WARN L188 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-03 21:04:06,833 WARN L188 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-03 21:04:07,265 WARN L188 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-03 21:04:07,712 WARN L188 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-03 21:04:08,149 WARN L188 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-03 21:04:08,570 WARN L188 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-03 21:04:08,987 WARN L188 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-03 21:04:09,418 WARN L188 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-03 21:04:09,842 WARN L188 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-03 21:04:10,253 WARN L188 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-03 21:04:10,671 WARN L188 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-03 21:04:11,093 WARN L188 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-03 21:04:11,518 WARN L188 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-03 21:04:11,952 WARN L188 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-03 21:04:12,380 WARN L188 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-03 21:04:12,819 WARN L188 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-03 21:04:13,232 WARN L188 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-03 21:04:13,658 WARN L188 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-03 21:04:14,072 WARN L188 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-03 21:04:14,495 WARN L188 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-03 21:04:14,919 WARN L188 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-03 21:04:15,343 WARN L188 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-03 21:04:15,762 WARN L188 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-03 21:04:16,187 WARN L188 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-03 21:04:16,598 WARN L188 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-03 21:04:17,028 WARN L188 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-03 21:04:17,444 WARN L188 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-03 21:04:17,862 WARN L188 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-03 21:04:18,277 WARN L188 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-03 21:04:18,694 WARN L188 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-03 21:04:19,095 WARN L188 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-03 21:04:19,490 WARN L188 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-03 21:04:19,903 WARN L188 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-03 21:04:20,292 WARN L188 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-03 21:04:20,668 WARN L188 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-03 21:04:21,058 WARN L188 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-03 21:04:21,462 WARN L188 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-03 21:04:21,858 WARN L188 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-03 21:04:34,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 21:04:34,023 INFO L93 Difference]: Finished difference Result 220 states and 220 transitions. [2019-09-03 21:04:34,023 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2019-09-03 21:04:34,023 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 211 [2019-09-03 21:04:34,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 21:04:34,024 INFO L225 Difference]: With dead ends: 220 [2019-09-03 21:04:34,024 INFO L226 Difference]: Without dead ends: 220 [2019-09-03 21:04:34,026 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 628 GetRequests, 318 SyntacticMatches, 2 SemanticMatches, 308 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6256 ImplicationChecksByTransitivity, 53.8s TimeCoverageRelationStatistics Valid=36391, Invalid=59399, Unknown=0, NotChecked=0, Total=95790 [2019-09-03 21:04:34,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2019-09-03 21:04:34,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 220. [2019-09-03 21:04:34,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2019-09-03 21:04:34,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 220 transitions. [2019-09-03 21:04:34,031 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 220 transitions. Word has length 211 [2019-09-03 21:04:34,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 21:04:34,031 INFO L475 AbstractCegarLoop]: Abstraction has 220 states and 220 transitions. [2019-09-03 21:04:34,031 INFO L476 AbstractCegarLoop]: Interpolant automaton has 107 states. [2019-09-03 21:04:34,031 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 220 transitions. [2019-09-03 21:04:34,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2019-09-03 21:04:34,033 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 21:04:34,033 INFO L399 BasicCegarLoop]: trace histogram [104, 104, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 21:04:34,033 INFO L418 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 21:04:34,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:04:34,034 INFO L82 PathProgramCache]: Analyzing trace with hash 122454831, now seen corresponding path program 27 times [2019-09-03 21:04:34,034 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 21:04:34,034 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:04:34,034 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 21:04:34,035 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:04:34,035 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 21:04:34,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:04:40,057 INFO L134 CoverageAnalysis]: Checked inductivity of 10816 backedges. 0 proven. 10816 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:04:40,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:04:40,058 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 21:04:40,058 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 21:04:40,058 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 21:04:40,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:04:40,058 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 [2019-09-03 21:04:40,069 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-03 21:04:40,069 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-03 21:04:41,125 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 21:04:41,125 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 21:04:41,898 INFO L256 TraceCheckSpWp]: Trace formula consists of 340 conjuncts, 107 conjunts are in the unsatisfiable core [2019-09-03 21:04:41,901 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 21:04:42,255 INFO L134 CoverageAnalysis]: Checked inductivity of 10816 backedges. 0 proven. 10816 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:04:42,255 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 21:04:56,686 INFO L134 CoverageAnalysis]: Checked inductivity of 10816 backedges. 0 proven. 10816 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:04:56,690 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 21:04:56,691 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [108, 108, 108] total 215 [2019-09-03 21:04:56,691 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 21:04:56,691 INFO L454 AbstractCegarLoop]: Interpolant automaton has 111 states [2019-09-03 21:04:56,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2019-09-03 21:04:56,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16712, Invalid=29298, Unknown=0, NotChecked=0, Total=46010 [2019-09-03 21:04:56,693 INFO L87 Difference]: Start difference. First operand 220 states and 220 transitions. Second operand 111 states. [2019-09-03 21:04:57,204 WARN L188 SmtUtils]: Spent 335.00 ms on a formula simplification. DAG size of input: 312 DAG size of output: 8 [2019-09-03 21:04:57,570 WARN L188 SmtUtils]: Spent 345.00 ms on a formula simplification. DAG size of input: 315 DAG size of output: 8 [2019-09-03 21:04:57,965 WARN L188 SmtUtils]: Spent 369.00 ms on a formula simplification. DAG size of input: 321 DAG size of output: 9 [2019-09-03 21:04:58,382 WARN L188 SmtUtils]: Spent 378.00 ms on a formula simplification. DAG size of input: 320 DAG size of output: 11 [2019-09-03 21:04:58,791 WARN L188 SmtUtils]: Spent 363.00 ms on a formula simplification. DAG size of input: 317 DAG size of output: 11 [2019-09-03 21:04:59,191 WARN L188 SmtUtils]: Spent 344.00 ms on a formula simplification. DAG size of input: 314 DAG size of output: 11 [2019-09-03 21:04:59,612 WARN L188 SmtUtils]: Spent 343.00 ms on a formula simplification. DAG size of input: 311 DAG size of output: 11 [2019-09-03 21:05:00,027 WARN L188 SmtUtils]: Spent 335.00 ms on a formula simplification. DAG size of input: 308 DAG size of output: 11 [2019-09-03 21:05:00,425 WARN L188 SmtUtils]: Spent 318.00 ms on a formula simplification. DAG size of input: 305 DAG size of output: 11 [2019-09-03 21:05:00,838 WARN L188 SmtUtils]: Spent 319.00 ms on a formula simplification. DAG size of input: 302 DAG size of output: 11 [2019-09-03 21:05:01,268 WARN L188 SmtUtils]: Spent 311.00 ms on a formula simplification. DAG size of input: 299 DAG size of output: 11 [2019-09-03 21:05:01,722 WARN L188 SmtUtils]: Spent 327.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2019-09-03 21:05:02,174 WARN L188 SmtUtils]: Spent 313.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2019-09-03 21:05:02,623 WARN L188 SmtUtils]: Spent 312.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2019-09-03 21:05:03,061 WARN L188 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2019-09-03 21:05:03,507 WARN L188 SmtUtils]: Spent 300.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2019-09-03 21:05:03,932 WARN L188 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2019-09-03 21:05:04,352 WARN L188 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2019-09-03 21:05:04,791 WARN L188 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2019-09-03 21:05:05,250 WARN L188 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2019-09-03 21:05:05,734 WARN L188 SmtUtils]: Spent 292.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2019-09-03 21:05:06,210 WARN L188 SmtUtils]: Spent 281.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2019-09-03 21:05:06,676 WARN L188 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2019-09-03 21:05:07,159 WARN L188 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-03 21:05:07,603 WARN L188 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-03 21:05:08,050 WARN L188 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-03 21:05:08,494 WARN L188 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-03 21:05:08,969 WARN L188 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-03 21:05:09,430 WARN L188 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-03 21:05:09,897 WARN L188 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-03 21:05:10,378 WARN L188 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-03 21:05:10,835 WARN L188 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-03 21:05:11,282 WARN L188 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-03 21:05:11,743 WARN L188 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-03 21:05:12,194 WARN L188 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-03 21:05:12,645 WARN L188 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-03 21:05:13,096 WARN L188 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-03 21:05:13,550 WARN L188 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-03 21:05:13,992 WARN L188 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-03 21:05:14,424 WARN L188 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-03 21:05:14,873 WARN L188 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-03 21:05:15,330 WARN L188 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-03 21:05:15,787 WARN L188 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-03 21:05:16,228 WARN L188 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-03 21:05:16,669 WARN L188 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-03 21:05:17,202 WARN L188 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-03 21:05:17,661 WARN L188 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-03 21:05:18,107 WARN L188 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-03 21:05:18,547 WARN L188 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-03 21:05:18,987 WARN L188 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-03 21:05:19,426 WARN L188 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-03 21:05:19,872 WARN L188 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-03 21:05:20,305 WARN L188 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-03 21:05:20,741 WARN L188 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-03 21:05:21,195 WARN L188 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-03 21:05:21,620 WARN L188 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-03 21:05:22,052 WARN L188 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-03 21:05:22,469 WARN L188 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-03 21:05:22,897 WARN L188 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-03 21:05:23,295 WARN L188 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-03 21:05:23,702 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-03 21:05:24,101 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-03 21:05:24,505 WARN L188 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2019-09-03 21:05:36,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 21:05:36,681 INFO L93 Difference]: Finished difference Result 228 states and 228 transitions. [2019-09-03 21:05:36,681 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2019-09-03 21:05:36,681 INFO L78 Accepts]: Start accepts. Automaton has 111 states. Word has length 219 [2019-09-03 21:05:36,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 21:05:36,682 INFO L225 Difference]: With dead ends: 228 [2019-09-03 21:05:36,682 INFO L226 Difference]: Without dead ends: 228 [2019-09-03 21:05:36,685 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 652 GetRequests, 330 SyntacticMatches, 2 SemanticMatches, 320 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6714 ImplicationChecksByTransitivity, 58.6s TimeCoverageRelationStatistics Valid=39301, Invalid=64061, Unknown=0, NotChecked=0, Total=103362 [2019-09-03 21:05:36,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2019-09-03 21:05:36,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 228. [2019-09-03 21:05:36,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 228 states. [2019-09-03 21:05:36,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 228 transitions. [2019-09-03 21:05:36,689 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 228 transitions. Word has length 219 [2019-09-03 21:05:36,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 21:05:36,690 INFO L475 AbstractCegarLoop]: Abstraction has 228 states and 228 transitions. [2019-09-03 21:05:36,690 INFO L476 AbstractCegarLoop]: Interpolant automaton has 111 states. [2019-09-03 21:05:36,690 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 228 transitions. [2019-09-03 21:05:36,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2019-09-03 21:05:36,691 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 21:05:36,691 INFO L399 BasicCegarLoop]: trace histogram [108, 108, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 21:05:36,691 INFO L418 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 21:05:36,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:05:36,692 INFO L82 PathProgramCache]: Analyzing trace with hash 1166861607, now seen corresponding path program 28 times [2019-09-03 21:05:36,692 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 21:05:36,692 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:05:36,693 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 21:05:36,693 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:05:36,693 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 21:05:37,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:05:43,007 INFO L134 CoverageAnalysis]: Checked inductivity of 11664 backedges. 0 proven. 11664 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:05:43,008 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:05:43,008 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 21:05:43,008 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 21:05:43,008 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 21:05:43,008 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:05:43,008 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 [2019-09-03 21:05:43,018 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:05:43,018 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-03 21:05:44,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:05:44,766 INFO L256 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 111 conjunts are in the unsatisfiable core [2019-09-03 21:05:44,769 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 21:05:45,174 INFO L134 CoverageAnalysis]: Checked inductivity of 11664 backedges. 0 proven. 11664 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:05:45,174 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 21:06:00,622 INFO L134 CoverageAnalysis]: Checked inductivity of 11664 backedges. 0 proven. 11664 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:06:00,625 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 21:06:00,626 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [112, 112, 112] total 223 [2019-09-03 21:06:00,626 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 21:06:00,626 INFO L454 AbstractCegarLoop]: Interpolant automaton has 115 states [2019-09-03 21:06:00,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2019-09-03 21:06:00,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18002, Invalid=31504, Unknown=0, NotChecked=0, Total=49506 [2019-09-03 21:06:00,628 INFO L87 Difference]: Start difference. First operand 228 states and 228 transitions. Second operand 115 states. [2019-09-03 21:06:01,142 WARN L188 SmtUtils]: Spent 360.00 ms on a formula simplification. DAG size of input: 324 DAG size of output: 8 [2019-09-03 21:06:01,531 WARN L188 SmtUtils]: Spent 362.00 ms on a formula simplification. DAG size of input: 327 DAG size of output: 8 [2019-09-03 21:06:01,982 WARN L188 SmtUtils]: Spent 423.00 ms on a formula simplification. DAG size of input: 333 DAG size of output: 9 [2019-09-03 21:06:02,412 WARN L188 SmtUtils]: Spent 382.00 ms on a formula simplification. DAG size of input: 332 DAG size of output: 11 [2019-09-03 21:06:02,827 WARN L188 SmtUtils]: Spent 369.00 ms on a formula simplification. DAG size of input: 329 DAG size of output: 11 [2019-09-03 21:06:03,246 WARN L188 SmtUtils]: Spent 361.00 ms on a formula simplification. DAG size of input: 326 DAG size of output: 11 [2019-09-03 21:06:03,687 WARN L188 SmtUtils]: Spent 356.00 ms on a formula simplification. DAG size of input: 323 DAG size of output: 11 [2019-09-03 21:06:04,115 WARN L188 SmtUtils]: Spent 349.00 ms on a formula simplification. DAG size of input: 320 DAG size of output: 11 [2019-09-03 21:06:04,547 WARN L188 SmtUtils]: Spent 347.00 ms on a formula simplification. DAG size of input: 317 DAG size of output: 11 [2019-09-03 21:06:04,984 WARN L188 SmtUtils]: Spent 339.00 ms on a formula simplification. DAG size of input: 314 DAG size of output: 11 [2019-09-03 21:06:05,416 WARN L188 SmtUtils]: Spent 331.00 ms on a formula simplification. DAG size of input: 311 DAG size of output: 11 [2019-09-03 21:06:05,874 WARN L188 SmtUtils]: Spent 349.00 ms on a formula simplification. DAG size of input: 308 DAG size of output: 11 [2019-09-03 21:06:06,317 WARN L188 SmtUtils]: Spent 322.00 ms on a formula simplification. DAG size of input: 305 DAG size of output: 11 [2019-09-03 21:06:06,769 WARN L188 SmtUtils]: Spent 326.00 ms on a formula simplification. DAG size of input: 302 DAG size of output: 11 [2019-09-03 21:06:07,233 WARN L188 SmtUtils]: Spent 325.00 ms on a formula simplification. DAG size of input: 299 DAG size of output: 11 [2019-09-03 21:06:07,705 WARN L188 SmtUtils]: Spent 327.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2019-09-03 21:06:08,185 WARN L188 SmtUtils]: Spent 310.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2019-09-03 21:06:08,659 WARN L188 SmtUtils]: Spent 309.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2019-09-03 21:06:09,133 WARN L188 SmtUtils]: Spent 303.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2019-09-03 21:06:09,599 WARN L188 SmtUtils]: Spent 284.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2019-09-03 21:06:10,062 WARN L188 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2019-09-03 21:06:10,556 WARN L188 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2019-09-03 21:06:11,017 WARN L188 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2019-09-03 21:06:11,506 WARN L188 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2019-09-03 21:06:11,992 WARN L188 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2019-09-03 21:06:12,485 WARN L188 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2019-09-03 21:06:12,995 WARN L188 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2019-09-03 21:06:13,485 WARN L188 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-03 21:06:13,977 WARN L188 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-03 21:06:14,457 WARN L188 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-03 21:06:14,938 WARN L188 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-03 21:06:15,426 WARN L188 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-03 21:06:15,917 WARN L188 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-03 21:06:16,398 WARN L188 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-03 21:06:16,885 WARN L188 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-03 21:06:17,355 WARN L188 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-03 21:06:17,832 WARN L188 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-03 21:06:18,300 WARN L188 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-03 21:06:18,794 WARN L188 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-03 21:06:19,254 WARN L188 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-03 21:06:19,733 WARN L188 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-03 21:06:20,203 WARN L188 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-03 21:06:20,673 WARN L188 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-03 21:06:21,157 WARN L188 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-03 21:06:21,634 WARN L188 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-03 21:06:22,120 WARN L188 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-03 21:06:22,627 WARN L188 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-03 21:06:23,105 WARN L188 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-03 21:06:23,572 WARN L188 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-03 21:06:24,040 WARN L188 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-03 21:06:24,508 WARN L188 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-03 21:06:24,996 WARN L188 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-03 21:06:25,475 WARN L188 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-03 21:06:25,933 WARN L188 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-03 21:06:26,395 WARN L188 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-03 21:06:26,860 WARN L188 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-03 21:06:27,338 WARN L188 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-03 21:06:27,774 WARN L188 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-03 21:06:28,241 WARN L188 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-03 21:06:28,688 WARN L188 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-03 21:06:29,130 WARN L188 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-03 21:06:29,569 WARN L188 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-03 21:06:30,020 WARN L188 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-03 21:06:30,440 WARN L188 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-03 21:06:30,890 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-03 21:06:31,320 WARN L188 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-03 21:06:31,752 WARN L188 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2019-09-03 21:06:46,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 21:06:46,539 INFO L93 Difference]: Finished difference Result 236 states and 236 transitions. [2019-09-03 21:06:46,539 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2019-09-03 21:06:46,539 INFO L78 Accepts]: Start accepts. Automaton has 115 states. Word has length 227 [2019-09-03 21:06:46,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 21:06:46,541 INFO L225 Difference]: With dead ends: 236 [2019-09-03 21:06:46,541 INFO L226 Difference]: Without dead ends: 236 [2019-09-03 21:06:46,545 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 676 GetRequests, 342 SyntacticMatches, 2 SemanticMatches, 332 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7188 ImplicationChecksByTransitivity, 66.0s TimeCoverageRelationStatistics Valid=42323, Invalid=68898, Unknown=1, NotChecked=0, Total=111222 [2019-09-03 21:06:46,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2019-09-03 21:06:46,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 236. [2019-09-03 21:06:46,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 236 states. [2019-09-03 21:06:46,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 236 transitions. [2019-09-03 21:06:46,549 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 236 transitions. Word has length 227 [2019-09-03 21:06:46,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 21:06:46,549 INFO L475 AbstractCegarLoop]: Abstraction has 236 states and 236 transitions. [2019-09-03 21:06:46,549 INFO L476 AbstractCegarLoop]: Interpolant automaton has 115 states. [2019-09-03 21:06:46,550 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 236 transitions. [2019-09-03 21:06:46,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 236 [2019-09-03 21:06:46,551 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 21:06:46,551 INFO L399 BasicCegarLoop]: trace histogram [112, 112, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 21:06:46,551 INFO L418 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 21:06:46,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:06:46,552 INFO L82 PathProgramCache]: Analyzing trace with hash -735588577, now seen corresponding path program 29 times [2019-09-03 21:06:46,552 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 21:06:46,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:06:46,552 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:06:46,553 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:06:46,553 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 21:06:47,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:06:53,304 INFO L134 CoverageAnalysis]: Checked inductivity of 12544 backedges. 0 proven. 12544 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:06:53,304 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:06:53,305 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 21:06:53,305 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 21:06:53,305 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 21:06:53,305 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:06:53,305 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 [2019-09-03 21:06:53,315 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-03 21:06:53,315 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-03 21:06:53,503 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 113 check-sat command(s) [2019-09-03 21:06:53,503 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 21:06:53,510 INFO L256 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 115 conjunts are in the unsatisfiable core [2019-09-03 21:06:53,512 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 21:06:53,902 INFO L134 CoverageAnalysis]: Checked inductivity of 12544 backedges. 0 proven. 12544 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:06:53,902 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 21:07:10,476 INFO L134 CoverageAnalysis]: Checked inductivity of 12544 backedges. 0 proven. 12544 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:07:10,480 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 21:07:10,480 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [116, 116, 116] total 231 [2019-09-03 21:07:10,480 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 21:07:10,481 INFO L454 AbstractCegarLoop]: Interpolant automaton has 119 states [2019-09-03 21:07:10,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2019-09-03 21:07:10,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19340, Invalid=33790, Unknown=0, NotChecked=0, Total=53130 [2019-09-03 21:07:10,483 INFO L87 Difference]: Start difference. First operand 236 states and 236 transitions. Second operand 119 states. [2019-09-03 21:07:11,034 WARN L188 SmtUtils]: Spent 385.00 ms on a formula simplification. DAG size of input: 336 DAG size of output: 8 [2019-09-03 21:07:11,446 WARN L188 SmtUtils]: Spent 390.00 ms on a formula simplification. DAG size of input: 339 DAG size of output: 8 [2019-09-03 21:07:11,921 WARN L188 SmtUtils]: Spent 449.00 ms on a formula simplification. DAG size of input: 345 DAG size of output: 9 [2019-09-03 21:07:12,368 WARN L188 SmtUtils]: Spent 406.00 ms on a formula simplification. DAG size of input: 344 DAG size of output: 11 [2019-09-03 21:07:12,828 WARN L188 SmtUtils]: Spent 412.00 ms on a formula simplification. DAG size of input: 341 DAG size of output: 11 [2019-09-03 21:07:13,270 WARN L188 SmtUtils]: Spent 391.00 ms on a formula simplification. DAG size of input: 338 DAG size of output: 11 [2019-09-03 21:07:13,722 WARN L188 SmtUtils]: Spent 383.00 ms on a formula simplification. DAG size of input: 335 DAG size of output: 11 [2019-09-03 21:07:14,189 WARN L188 SmtUtils]: Spent 390.00 ms on a formula simplification. DAG size of input: 332 DAG size of output: 11 [2019-09-03 21:07:14,664 WARN L188 SmtUtils]: Spent 386.00 ms on a formula simplification. DAG size of input: 329 DAG size of output: 11 [2019-09-03 21:07:15,135 WARN L188 SmtUtils]: Spent 375.00 ms on a formula simplification. DAG size of input: 326 DAG size of output: 11 [2019-09-03 21:07:15,625 WARN L188 SmtUtils]: Spent 376.00 ms on a formula simplification. DAG size of input: 323 DAG size of output: 11 [2019-09-03 21:07:16,115 WARN L188 SmtUtils]: Spent 377.00 ms on a formula simplification. DAG size of input: 320 DAG size of output: 11 [2019-09-03 21:07:16,627 WARN L188 SmtUtils]: Spent 382.00 ms on a formula simplification. DAG size of input: 317 DAG size of output: 11 [2019-09-03 21:07:17,118 WARN L188 SmtUtils]: Spent 356.00 ms on a formula simplification. DAG size of input: 314 DAG size of output: 11 [2019-09-03 21:07:17,606 WARN L188 SmtUtils]: Spent 343.00 ms on a formula simplification. DAG size of input: 311 DAG size of output: 11 [2019-09-03 21:07:18,109 WARN L188 SmtUtils]: Spent 351.00 ms on a formula simplification. DAG size of input: 308 DAG size of output: 11 [2019-09-03 21:07:18,619 WARN L188 SmtUtils]: Spent 330.00 ms on a formula simplification. DAG size of input: 305 DAG size of output: 11 [2019-09-03 21:07:19,134 WARN L188 SmtUtils]: Spent 333.00 ms on a formula simplification. DAG size of input: 302 DAG size of output: 11 [2019-09-03 21:07:19,651 WARN L188 SmtUtils]: Spent 325.00 ms on a formula simplification. DAG size of input: 299 DAG size of output: 11 [2019-09-03 21:07:20,172 WARN L188 SmtUtils]: Spent 321.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2019-09-03 21:07:20,692 WARN L188 SmtUtils]: Spent 321.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2019-09-03 21:07:21,207 WARN L188 SmtUtils]: Spent 317.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2019-09-03 21:07:21,725 WARN L188 SmtUtils]: Spent 313.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2019-09-03 21:07:22,269 WARN L188 SmtUtils]: Spent 317.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2019-09-03 21:07:22,792 WARN L188 SmtUtils]: Spent 292.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2019-09-03 21:07:23,307 WARN L188 SmtUtils]: Spent 284.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2019-09-03 21:07:23,828 WARN L188 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2019-09-03 21:07:24,345 WARN L188 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2019-09-03 21:07:24,860 WARN L188 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2019-09-03 21:07:25,382 WARN L188 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2019-09-03 21:07:25,903 WARN L188 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2019-09-03 21:07:26,425 WARN L188 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-03 21:07:26,949 WARN L188 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-03 21:07:27,472 WARN L188 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-03 21:07:28,036 WARN L188 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-03 21:07:28,588 WARN L188 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-03 21:07:29,114 WARN L188 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-03 21:07:29,639 WARN L188 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-03 21:07:30,171 WARN L188 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-03 21:07:30,708 WARN L188 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-03 21:07:31,246 WARN L188 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-03 21:07:31,744 WARN L188 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-03 21:07:32,239 WARN L188 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-03 21:07:32,731 WARN L188 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-03 21:07:33,247 WARN L188 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-03 21:07:33,768 WARN L188 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-03 21:07:34,307 WARN L188 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-03 21:07:34,810 WARN L188 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-03 21:07:35,306 WARN L188 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-03 21:07:35,805 WARN L188 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-03 21:07:36,302 WARN L188 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-03 21:07:36,821 WARN L188 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-03 21:07:37,336 WARN L188 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-03 21:07:37,826 WARN L188 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-03 21:07:38,313 WARN L188 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-03 21:07:38,799 WARN L188 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-03 21:07:39,293 WARN L188 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-03 21:07:39,792 WARN L188 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-03 21:07:40,286 WARN L188 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-03 21:07:40,772 WARN L188 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-03 21:07:41,245 WARN L188 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-03 21:07:41,721 WARN L188 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-03 21:07:42,204 WARN L188 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-03 21:07:42,677 WARN L188 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-03 21:07:43,164 WARN L188 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-03 21:07:43,644 WARN L188 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-03 21:07:44,110 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-03 21:07:44,569 WARN L188 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-03 21:07:44,999 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-03 21:07:45,877 WARN L188 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2019-09-03 21:07:58,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 21:07:58,900 INFO L93 Difference]: Finished difference Result 244 states and 244 transitions. [2019-09-03 21:07:58,901 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2019-09-03 21:07:58,901 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 235 [2019-09-03 21:07:58,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 21:07:58,903 INFO L225 Difference]: With dead ends: 244 [2019-09-03 21:07:58,903 INFO L226 Difference]: Without dead ends: 244 [2019-09-03 21:07:58,906 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 700 GetRequests, 354 SyntacticMatches, 2 SemanticMatches, 344 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7678 ImplicationChecksByTransitivity, 69.9s TimeCoverageRelationStatistics Valid=45457, Invalid=73913, Unknown=0, NotChecked=0, Total=119370 [2019-09-03 21:07:58,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2019-09-03 21:07:58,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 244. [2019-09-03 21:07:58,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2019-09-03 21:07:58,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 244 transitions. [2019-09-03 21:07:58,910 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 244 transitions. Word has length 235 [2019-09-03 21:07:58,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 21:07:58,911 INFO L475 AbstractCegarLoop]: Abstraction has 244 states and 244 transitions. [2019-09-03 21:07:58,911 INFO L476 AbstractCegarLoop]: Interpolant automaton has 119 states. [2019-09-03 21:07:58,911 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 244 transitions. [2019-09-03 21:07:58,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2019-09-03 21:07:58,912 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 21:07:58,912 INFO L399 BasicCegarLoop]: trace histogram [116, 116, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 21:07:58,912 INFO L418 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 21:07:58,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:07:58,913 INFO L82 PathProgramCache]: Analyzing trace with hash 336937239, now seen corresponding path program 30 times [2019-09-03 21:07:58,913 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 21:07:58,914 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:07:58,914 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 21:07:58,914 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:07:58,914 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 21:08:00,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:08:06,433 INFO L134 CoverageAnalysis]: Checked inductivity of 13456 backedges. 0 proven. 13456 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:08:06,433 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:08:06,433 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 21:08:06,433 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 21:08:06,434 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 21:08:06,434 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:08:06,434 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 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 [2019-09-03 21:08:06,443 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-03 21:08:06,443 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-03 21:08:07,928 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 21:08:07,928 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 21:08:09,030 INFO L256 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 119 conjunts are in the unsatisfiable core [2019-09-03 21:08:09,033 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 21:08:09,555 INFO L134 CoverageAnalysis]: Checked inductivity of 13456 backedges. 0 proven. 13456 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:08:09,555 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 21:08:27,210 INFO L134 CoverageAnalysis]: Checked inductivity of 13456 backedges. 0 proven. 13456 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:08:27,214 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-03 21:08:27,214 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [120, 120, 120] total 239 [2019-09-03 21:08:27,214 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 21:08:27,214 INFO L454 AbstractCegarLoop]: Interpolant automaton has 123 states [2019-09-03 21:08:27,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2019-09-03 21:08:27,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20726, Invalid=36156, Unknown=0, NotChecked=0, Total=56882 [2019-09-03 21:08:27,216 INFO L87 Difference]: Start difference. First operand 244 states and 244 transitions. Second operand 123 states. [2019-09-03 21:08:27,791 WARN L188 SmtUtils]: Spent 402.00 ms on a formula simplification. DAG size of input: 348 DAG size of output: 8 [2019-09-03 21:08:28,227 WARN L188 SmtUtils]: Spent 413.00 ms on a formula simplification. DAG size of input: 351 DAG size of output: 8 [2019-09-03 21:08:28,692 WARN L188 SmtUtils]: Spent 440.00 ms on a formula simplification. DAG size of input: 357 DAG size of output: 9 [2019-09-03 21:08:29,165 WARN L188 SmtUtils]: Spent 431.00 ms on a formula simplification. DAG size of input: 356 DAG size of output: 11 [2019-09-03 21:08:29,643 WARN L188 SmtUtils]: Spent 427.00 ms on a formula simplification. DAG size of input: 353 DAG size of output: 11 [2019-09-03 21:08:30,123 WARN L188 SmtUtils]: Spent 421.00 ms on a formula simplification. DAG size of input: 350 DAG size of output: 11 [2019-09-03 21:08:30,615 WARN L188 SmtUtils]: Spent 416.00 ms on a formula simplification. DAG size of input: 347 DAG size of output: 11 [2019-09-03 21:08:31,106 WARN L188 SmtUtils]: Spent 414.00 ms on a formula simplification. DAG size of input: 344 DAG size of output: 11 [2019-09-03 21:08:31,606 WARN L188 SmtUtils]: Spent 405.00 ms on a formula simplification. DAG size of input: 341 DAG size of output: 11 [2019-09-03 21:08:32,140 WARN L188 SmtUtils]: Spent 426.00 ms on a formula simplification. DAG size of input: 338 DAG size of output: 11 [2019-09-03 21:08:32,644 WARN L188 SmtUtils]: Spent 391.00 ms on a formula simplification. DAG size of input: 335 DAG size of output: 11 [2019-09-03 21:08:33,176 WARN L188 SmtUtils]: Spent 393.00 ms on a formula simplification. DAG size of input: 332 DAG size of output: 11 [2019-09-03 21:08:33,683 WARN L188 SmtUtils]: Spent 382.00 ms on a formula simplification. DAG size of input: 329 DAG size of output: 11 [2019-09-03 21:08:34,209 WARN L188 SmtUtils]: Spent 376.00 ms on a formula simplification. DAG size of input: 326 DAG size of output: 11 [2019-09-03 21:08:34,734 WARN L188 SmtUtils]: Spent 377.00 ms on a formula simplification. DAG size of input: 323 DAG size of output: 11 [2019-09-03 21:08:35,261 WARN L188 SmtUtils]: Spent 370.00 ms on a formula simplification. DAG size of input: 320 DAG size of output: 11 [2019-09-03 21:08:35,801 WARN L188 SmtUtils]: Spent 361.00 ms on a formula simplification. DAG size of input: 317 DAG size of output: 11 [2019-09-03 21:08:36,334 WARN L188 SmtUtils]: Spent 352.00 ms on a formula simplification. DAG size of input: 314 DAG size of output: 11 [2019-09-03 21:08:36,869 WARN L188 SmtUtils]: Spent 338.00 ms on a formula simplification. DAG size of input: 311 DAG size of output: 11 [2019-09-03 21:08:37,408 WARN L188 SmtUtils]: Spent 349.00 ms on a formula simplification. DAG size of input: 308 DAG size of output: 11 [2019-09-03 21:08:37,978 WARN L188 SmtUtils]: Spent 359.00 ms on a formula simplification. DAG size of input: 305 DAG size of output: 11 [2019-09-03 21:08:38,522 WARN L188 SmtUtils]: Spent 327.00 ms on a formula simplification. DAG size of input: 302 DAG size of output: 11 [2019-09-03 21:08:39,073 WARN L188 SmtUtils]: Spent 325.00 ms on a formula simplification. DAG size of input: 299 DAG size of output: 11 [2019-09-03 21:08:39,621 WARN L188 SmtUtils]: Spent 322.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 11 [2019-09-03 21:08:40,192 WARN L188 SmtUtils]: Spent 315.00 ms on a formula simplification. DAG size of input: 293 DAG size of output: 11 [2019-09-03 21:08:40,743 WARN L188 SmtUtils]: Spent 305.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 11 [2019-09-03 21:08:41,299 WARN L188 SmtUtils]: Spent 306.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 11 [2019-09-03 21:08:41,845 WARN L188 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 284 DAG size of output: 11 [2019-09-03 21:08:42,408 WARN L188 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 281 DAG size of output: 11 [2019-09-03 21:08:42,961 WARN L188 SmtUtils]: Spent 289.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 11 [2019-09-03 21:08:43,509 WARN L188 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 275 DAG size of output: 11 [2019-09-03 21:08:44,093 WARN L188 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 272 DAG size of output: 11 [2019-09-03 21:08:44,636 WARN L188 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 269 DAG size of output: 11 [2019-09-03 21:08:45,206 WARN L188 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 11 [2019-09-03 21:08:45,790 WARN L188 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 263 DAG size of output: 11 [2019-09-03 21:08:46,349 WARN L188 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 11 [2019-09-03 21:08:46,914 WARN L188 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 257 DAG size of output: 11 [2019-09-03 21:08:47,473 WARN L188 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 254 DAG size of output: 11 [2019-09-03 21:08:48,036 WARN L188 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 251 DAG size of output: 11 [2019-09-03 21:08:48,601 WARN L188 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 248 DAG size of output: 11 [2019-09-03 21:08:49,205 WARN L188 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 11 [2019-09-03 21:08:49,749 WARN L188 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 11 [2019-09-03 21:08:50,300 WARN L188 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 11 [2019-09-03 21:08:50,818 WARN L188 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2019-09-03 21:08:51,350 WARN L188 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 11 [2019-09-03 21:08:51,910 WARN L188 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 230 DAG size of output: 11 [2019-09-03 21:08:52,455 WARN L188 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2019-09-03 21:08:53,007 WARN L188 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2019-09-03 21:08:53,534 WARN L188 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2019-09-03 21:08:54,089 WARN L188 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2019-09-03 21:08:54,621 WARN L188 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2019-09-03 21:08:55,153 WARN L188 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2019-09-03 21:08:55,682 WARN L188 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2019-09-03 21:08:56,215 WARN L188 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2019-09-03 21:08:56,741 WARN L188 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2019-09-03 21:08:57,295 WARN L188 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2019-09-03 21:08:57,819 WARN L188 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2019-09-03 21:08:58,359 WARN L188 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2019-09-03 21:08:58,896 WARN L188 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2019-09-03 21:08:59,419 WARN L188 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2019-09-03 21:08:59,937 WARN L188 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2019-09-03 21:09:00,472 WARN L188 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2019-09-03 21:09:00,993 WARN L188 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2019-09-03 21:09:01,519 WARN L188 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2019-09-03 21:09:02,038 WARN L188 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2019-09-03 21:09:02,556 WARN L188 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2019-09-03 21:09:03,081 WARN L188 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2019-09-03 21:09:03,596 WARN L188 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2019-09-03 21:09:04,114 WARN L188 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2019-09-03 21:09:04,633 WARN L188 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2019-09-03 21:09:05,123 WARN L188 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2019-09-03 21:09:05,594 WARN L188 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2019-09-03 21:09:06,065 WARN L188 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2019-09-03 21:09:06,510 WARN L188 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2019-09-03 21:09:06,968 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2019-09-03 21:09:20,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 21:09:20,700 INFO L93 Difference]: Finished difference Result 252 states and 252 transitions. [2019-09-03 21:09:20,700 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2019-09-03 21:09:20,701 INFO L78 Accepts]: Start accepts. Automaton has 123 states. Word has length 243 [2019-09-03 21:09:20,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 21:09:20,702 INFO L225 Difference]: With dead ends: 252 [2019-09-03 21:09:20,702 INFO L226 Difference]: Without dead ends: 252 [2019-09-03 21:09:20,705 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 724 GetRequests, 366 SyntacticMatches, 2 SemanticMatches, 356 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8184 ImplicationChecksByTransitivity, 76.5s TimeCoverageRelationStatistics Valid=48703, Invalid=79103, Unknown=0, NotChecked=0, Total=127806 [2019-09-03 21:09:20,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2019-09-03 21:09:20,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 252. [2019-09-03 21:09:20,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 252 states. [2019-09-03 21:09:20,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 252 transitions. [2019-09-03 21:09:20,710 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 252 transitions. Word has length 243 [2019-09-03 21:09:20,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 21:09:20,710 INFO L475 AbstractCegarLoop]: Abstraction has 252 states and 252 transitions. [2019-09-03 21:09:20,710 INFO L476 AbstractCegarLoop]: Interpolant automaton has 123 states. [2019-09-03 21:09:20,711 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 252 transitions. [2019-09-03 21:09:20,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 252 [2019-09-03 21:09:20,712 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 21:09:20,712 INFO L399 BasicCegarLoop]: trace histogram [120, 120, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 21:09:20,712 INFO L418 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 21:09:20,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:09:20,713 INFO L82 PathProgramCache]: Analyzing trace with hash -296928497, now seen corresponding path program 31 times [2019-09-03 21:09:20,713 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 21:09:20,713 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:20,713 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 21:09:20,714 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:20,714 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 21:09:21,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:09:28,566 INFO L134 CoverageAnalysis]: Checked inductivity of 14400 backedges. 0 proven. 14400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:09:28,566 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:09:28,566 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-03 21:09:28,566 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 21:09:28,566 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 21:09:28,566 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:09:28,566 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 [2019-09-03 21:09:28,577 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:28,577 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-03 21:09:30,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:09:30,927 INFO L256 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 123 conjunts are in the unsatisfiable core [2019-09-03 21:09:30,930 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 21:09:31,379 INFO L134 CoverageAnalysis]: Checked inductivity of 14400 backedges. 0 proven. 14400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:09:31,379 INFO L322 TraceCheckSpWp]: Computing backward predicates...