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/nested-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fea9116 [2019-09-20 13:25:58,644 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-20 13:25:58,646 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-20 13:25:58,658 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-09-20 13:25:58,694 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 [2019-09-20 13:25:58,712 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-20 13:25:58,712 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-20 13:25:58,713 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-20 13:25:58,713 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-20 13:25:58,714 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-20 13:25:58,714 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-20 13:25:58,714 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-20 13:25:58,714 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-20 13:25:58,714 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-20 13:25:58,715 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-20 13:25:58,716 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-20 13:25:58,716 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-20 13:25:58,717 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-20 13:25:58,717 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-20 13:25:58,717 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-20 13:25:58,717 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-20 13:25:58,717 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-20 13:25:58,718 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-20 13:25:58,718 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-20 13:25:58,718 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-20 13:25:58,718 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-20 13:25:58,718 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-20 13:25:58,719 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-20 13:25:58,719 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-20 13:25:58,719 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-20 13:25:58,720 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-20 13:25:58,720 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-20 13:25:58,720 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-20 13:25:58,720 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-20 13:25:58,721 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-20 13:25:58,777 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-20 13:25:58,790 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-20 13:25:58,793 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-20 13:25:58,795 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-20 13:25:58,795 INFO L275 PluginConnector]: CDTParser initialized [2019-09-20 13:25:58,796 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-new/nested-1.i [2019-09-20 13:25:58,860 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aa6e53df7/e737c7d0fe0f4a40aa5795ea48ddcf1d/FLAGc1ae043ff [2019-09-20 13:25:59,294 INFO L306 CDTParser]: Found 1 translation units. [2019-09-20 13:25:59,295 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/nested-1.i [2019-09-20 13:25:59,301 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aa6e53df7/e737c7d0fe0f4a40aa5795ea48ddcf1d/FLAGc1ae043ff [2019-09-20 13:25:59,710 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aa6e53df7/e737c7d0fe0f4a40aa5795ea48ddcf1d [2019-09-20 13:25:59,719 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-20 13:25:59,720 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-20 13:25:59,721 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-20 13:25:59,722 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-20 13:25:59,725 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-20 13:25:59,727 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.09 01:25:59" (1/1) ... [2019-09-20 13:25:59,730 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@38f4653d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:59, skipping insertion in model container [2019-09-20 13:25:59,730 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.09 01:25:59" (1/1) ... [2019-09-20 13:25:59,738 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-20 13:25:59,756 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-20 13:25:59,987 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-20 13:25:59,995 INFO L188 MainTranslator]: Completed pre-run [2019-09-20 13:26:00,015 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-20 13:26:00,029 INFO L192 MainTranslator]: Completed translation [2019-09-20 13:26:00,030 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:00 WrapperNode [2019-09-20 13:26:00,030 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-20 13:26:00,031 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-20 13:26:00,031 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-20 13:26:00,031 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-20 13:26:00,144 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:00" (1/1) ... [2019-09-20 13:26:00,144 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:00" (1/1) ... [2019-09-20 13:26:00,149 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:00" (1/1) ... [2019-09-20 13:26:00,149 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:00" (1/1) ... [2019-09-20 13:26:00,152 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:00" (1/1) ... [2019-09-20 13:26:00,157 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:00" (1/1) ... [2019-09-20 13:26:00,158 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:00" (1/1) ... [2019-09-20 13:26:00,160 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-20 13:26:00,160 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-20 13:26:00,160 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-20 13:26:00,161 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-20 13:26:00,161 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:00" (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 [2019-09-20 13:26:00,218 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-20 13:26:00,218 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-20 13:26:00,218 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-20 13:26:00,218 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-20 13:26:00,219 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-20 13:26:00,219 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-09-20 13:26:00,219 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-20 13:26:00,219 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-09-20 13:26:00,219 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-20 13:26:00,219 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-20 13:26:00,220 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-20 13:26:00,413 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-20 13:26:00,413 INFO L283 CfgBuilder]: Removed 2 assume(true) statements. [2019-09-20 13:26:00,415 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.09 01:26:00 BoogieIcfgContainer [2019-09-20 13:26:00,415 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-20 13:26:00,416 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-20 13:26:00,416 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-20 13:26:00,418 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-20 13:26:00,418 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.09 01:25:59" (1/3) ... [2019-09-20 13:26:00,419 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2565107e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.09 01:26:00, skipping insertion in model container [2019-09-20 13:26:00,419 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:26:00" (2/3) ... [2019-09-20 13:26:00,420 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2565107e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.09 01:26:00, skipping insertion in model container [2019-09-20 13:26:00,420 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.09 01:26:00" (3/3) ... [2019-09-20 13:26:00,422 INFO L109 eAbstractionObserver]: Analyzing ICFG nested-1.i [2019-09-20 13:26:00,431 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-20 13:26:00,438 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-20 13:26:00,454 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-20 13:26:00,480 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-20 13:26:00,481 INFO L378 AbstractCegarLoop]: Hoare is false [2019-09-20 13:26:00,481 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-20 13:26:00,481 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-20 13:26:00,481 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-20 13:26:00,481 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-20 13:26:00,481 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-20 13:26:00,481 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-20 13:26:00,493 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2019-09-20 13:26:00,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-09-20 13:26:00,501 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:00,502 INFO L407 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:00,505 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:00,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:00,509 INFO L82 PathProgramCache]: Analyzing trace with hash -1266359381, now seen corresponding path program 1 times [2019-09-20 13:26:00,511 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:00,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:00,561 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:00,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:00,561 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:00,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:00,663 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:26:00,666 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-20 13:26:00,666 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-09-20 13:26:00,666 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-20 13:26:00,672 INFO L454 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-09-20 13:26:00,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-09-20 13:26:00,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-09-20 13:26:00,694 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 4 states. [2019-09-20 13:26:00,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:00,788 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2019-09-20 13:26:00,789 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-09-20 13:26:00,791 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2019-09-20 13:26:00,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:00,801 INFO L225 Difference]: With dead ends: 29 [2019-09-20 13:26:00,801 INFO L226 Difference]: Without dead ends: 20 [2019-09-20 13:26:00,803 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-09-20 13:26:00,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-09-20 13:26:00,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2019-09-20 13:26:00,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-09-20 13:26:00,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2019-09-20 13:26:00,849 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 12 [2019-09-20 13:26:00,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:00,850 INFO L475 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2019-09-20 13:26:00,850 INFO L476 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-09-20 13:26:00,850 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2019-09-20 13:26:00,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-09-20 13:26:00,851 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:00,851 INFO L407 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:00,854 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:00,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:00,855 INFO L82 PathProgramCache]: Analyzing trace with hash -1008321469, now seen corresponding path program 1 times [2019-09-20 13:26:00,855 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:00,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:00,859 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:00,859 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:00,859 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:00,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:00,924 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:26:00,925 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-20 13:26:00,925 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-09-20 13:26:00,925 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-20 13:26:00,927 INFO L454 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-09-20 13:26:00,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-09-20 13:26:00,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-09-20 13:26:00,928 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2019-09-20 13:26:00,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:00,979 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2019-09-20 13:26:00,979 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-09-20 13:26:00,980 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-09-20 13:26:00,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:00,981 INFO L225 Difference]: With dead ends: 19 [2019-09-20 13:26:00,981 INFO L226 Difference]: Without dead ends: 19 [2019-09-20 13:26:00,982 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-09-20 13:26:00,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-09-20 13:26:00,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2019-09-20 13:26:00,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-09-20 13:26:00,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2019-09-20 13:26:00,988 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 15 [2019-09-20 13:26:00,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:00,989 INFO L475 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2019-09-20 13:26:00,989 INFO L476 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-09-20 13:26:00,989 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2019-09-20 13:26:00,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-09-20 13:26:00,989 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:00,990 INFO L407 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:00,990 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:00,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:00,990 INFO L82 PathProgramCache]: Analyzing trace with hash 1823795457, now seen corresponding path program 1 times [2019-09-20 13:26:00,990 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:00,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:00,992 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:00,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:00,992 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:01,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:01,134 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:26:01,135 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:01,135 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:26:01,139 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 18 with the following transitions: [2019-09-20 13:26:01,143 INFO L207 CegarAbsIntRunner]: [0], [4], [8], [12], [18], [20], [26], [28], [30], [34], [41], [44], [46], [52], [53], [54], [56] [2019-09-20 13:26:01,172 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-20 13:26:01,173 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-20 13:26:01,326 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-20 13:26:01,329 INFO L272 AbstractInterpreter]: Visited 17 different actions 90 times. Merged at 6 different actions 42 times. Widened at 3 different actions 11 times. Performed 221 root evaluator evaluations with a maximum evaluation depth of 4. Performed 221 inverse root evaluator evaluations with a maximum inverse evaluation depth of 4. Found 9 fixpoints after 3 different actions. Largest state had 10 variables. [2019-09-20 13:26:01,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:01,335 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-20 13:26:01,336 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:01,336 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 13:26:01,361 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:01,361 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-20 13:26:01,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:01,383 INFO L256 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 4 conjunts are in the unsatisfiable core [2019-09-20 13:26:01,392 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:26:01,483 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:26:01,484 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:26:01,563 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:26:01,568 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:26:01,569 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5, 5] total 14 [2019-09-20 13:26:01,569 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:26:01,569 INFO L454 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-09-20 13:26:01,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-09-20 13:26:01,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2019-09-20 13:26:01,571 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 11 states. [2019-09-20 13:26:01,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:01,845 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2019-09-20 13:26:01,846 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-09-20 13:26:01,846 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 17 [2019-09-20 13:26:01,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:01,847 INFO L225 Difference]: With dead ends: 28 [2019-09-20 13:26:01,847 INFO L226 Difference]: Without dead ends: 28 [2019-09-20 13:26:01,850 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=100, Invalid=280, Unknown=0, NotChecked=0, Total=380 [2019-09-20 13:26:01,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-09-20 13:26:01,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 20. [2019-09-20 13:26:01,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-09-20 13:26:01,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2019-09-20 13:26:01,857 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2019-09-20 13:26:01,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:01,857 INFO L475 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2019-09-20 13:26:01,859 INFO L476 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-09-20 13:26:01,859 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2019-09-20 13:26:01,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-09-20 13:26:01,860 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:01,860 INFO L407 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:01,861 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:01,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:01,861 INFO L82 PathProgramCache]: Analyzing trace with hash 478895679, now seen corresponding path program 2 times [2019-09-20 13:26:01,862 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:01,865 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:01,865 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:01,865 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:01,866 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:01,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:01,995 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:26:01,996 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:01,996 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:26:01,996 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:26:01,996 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:26:01,996 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:01,997 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 13:26:02,015 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-20 13:26:02,015 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-20 13:26:02,026 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-09-20 13:26:02,026 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 13:26:02,027 INFO L256 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 4 conjunts are in the unsatisfiable core [2019-09-20 13:26:02,029 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:26:02,069 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-09-20 13:26:02,070 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:26:02,124 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-09-20 13:26:02,128 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:26:02,128 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 5, 5] total 14 [2019-09-20 13:26:02,128 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:26:02,129 INFO L454 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-09-20 13:26:02,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-09-20 13:26:02,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2019-09-20 13:26:02,130 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 11 states. [2019-09-20 13:26:02,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:02,361 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2019-09-20 13:26:02,362 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-09-20 13:26:02,362 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 19 [2019-09-20 13:26:02,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:02,363 INFO L225 Difference]: With dead ends: 44 [2019-09-20 13:26:02,363 INFO L226 Difference]: Without dead ends: 44 [2019-09-20 13:26:02,364 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=126, Invalid=294, Unknown=0, NotChecked=0, Total=420 [2019-09-20 13:26:02,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-09-20 13:26:02,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 27. [2019-09-20 13:26:02,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-09-20 13:26:02,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2019-09-20 13:26:02,371 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 19 [2019-09-20 13:26:02,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:02,372 INFO L475 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2019-09-20 13:26:02,372 INFO L476 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-09-20 13:26:02,372 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2019-09-20 13:26:02,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-09-20 13:26:02,373 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:02,373 INFO L407 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:02,374 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:02,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:02,374 INFO L82 PathProgramCache]: Analyzing trace with hash 525702443, now seen corresponding path program 3 times [2019-09-20 13:26:02,374 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:02,377 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:02,377 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 13:26:02,377 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:02,377 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:02,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:02,605 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:26:02,606 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:02,606 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:26:02,606 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:26:02,606 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:26:02,607 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:02,607 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-20 13:26:02,626 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-20 13:26:02,626 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 13:26:02,644 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-20 13:26:02,644 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 13:26:02,645 INFO L256 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 5 conjunts are in the unsatisfiable core [2019-09-20 13:26:02,647 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:26:02,727 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-09-20 13:26:02,727 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:26:02,816 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-09-20 13:26:02,820 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:26:02,820 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 6, 6] total 22 [2019-09-20 13:26:02,820 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:26:02,821 INFO L454 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-09-20 13:26:02,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-09-20 13:26:02,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=391, Unknown=0, NotChecked=0, Total=462 [2019-09-20 13:26:02,822 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 18 states. [2019-09-20 13:26:03,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:03,143 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2019-09-20 13:26:03,144 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-09-20 13:26:03,144 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 26 [2019-09-20 13:26:03,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:03,145 INFO L225 Difference]: With dead ends: 33 [2019-09-20 13:26:03,145 INFO L226 Difference]: Without dead ends: 33 [2019-09-20 13:26:03,146 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=173, Invalid=697, Unknown=0, NotChecked=0, Total=870 [2019-09-20 13:26:03,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-09-20 13:26:03,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2019-09-20 13:26:03,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-09-20 13:26:03,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2019-09-20 13:26:03,150 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 26 [2019-09-20 13:26:03,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:03,151 INFO L475 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2019-09-20 13:26:03,151 INFO L476 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-09-20 13:26:03,151 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2019-09-20 13:26:03,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-09-20 13:26:03,152 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:03,152 INFO L407 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:03,152 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:03,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:03,153 INFO L82 PathProgramCache]: Analyzing trace with hash -441049109, now seen corresponding path program 4 times [2019-09-20 13:26:03,153 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:03,154 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:03,154 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 13:26:03,154 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:03,154 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:03,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:03,360 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:26:03,360 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:03,360 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:26:03,360 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:26:03,361 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:26:03,361 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:03,361 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) [2019-09-20 13:26:03,386 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:03,386 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 [2019-09-20 13:26:03,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:03,407 INFO L256 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 6 conjunts are in the unsatisfiable core [2019-09-20 13:26:03,409 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:26:03,520 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 27 proven. 9 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2019-09-20 13:26:03,520 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:26:03,661 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 27 proven. 9 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (5)] Exception during sending of exit command (exit): Broken pipe [2019-09-20 13:26:03,665 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:26:03,666 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 7, 7] total 26 [2019-09-20 13:26:03,666 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:26:03,667 INFO L454 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-09-20 13:26:03,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-09-20 13:26:03,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=550, Unknown=0, NotChecked=0, Total=650 [2019-09-20 13:26:03,668 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 21 states. [2019-09-20 13:26:04,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:04,108 INFO L93 Difference]: Finished difference Result 37 states and 39 transitions. [2019-09-20 13:26:04,109 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-09-20 13:26:04,109 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 30 [2019-09-20 13:26:04,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:04,110 INFO L225 Difference]: With dead ends: 37 [2019-09-20 13:26:04,110 INFO L226 Difference]: Without dead ends: 37 [2019-09-20 13:26:04,111 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=252, Invalid=1008, Unknown=0, NotChecked=0, Total=1260 [2019-09-20 13:26:04,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-09-20 13:26:04,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2019-09-20 13:26:04,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-09-20 13:26:04,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2019-09-20 13:26:04,117 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 30 [2019-09-20 13:26:04,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:04,117 INFO L475 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2019-09-20 13:26:04,117 INFO L476 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-09-20 13:26:04,117 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2019-09-20 13:26:04,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-09-20 13:26:04,118 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:04,119 INFO L407 BasicCegarLoop]: trace histogram [8, 8, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:04,119 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:04,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:04,119 INFO L82 PathProgramCache]: Analyzing trace with hash -1891685973, now seen corresponding path program 5 times [2019-09-20 13:26:04,120 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:04,121 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:04,122 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:04,122 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:04,122 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:04,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:04,321 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:26:04,321 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:04,321 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:26:04,321 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:26:04,322 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:26:04,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:04,322 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-20 13:26:04,348 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-20 13:26:04,348 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 13:26:04,378 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2019-09-20 13:26:04,379 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 13:26:04,380 INFO L256 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 7 conjunts are in the unsatisfiable core [2019-09-20 13:26:04,382 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:26:04,533 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 44 proven. 16 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2019-09-20 13:26:04,535 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:26:04,680 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 3 proven. 57 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2019-09-20 13:26:04,684 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:26:04,685 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 8, 8] total 30 [2019-09-20 13:26:04,685 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:26:04,685 INFO L454 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-09-20 13:26:04,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-09-20 13:26:04,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=735, Unknown=0, NotChecked=0, Total=870 [2019-09-20 13:26:04,688 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 24 states. [2019-09-20 13:26:05,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:05,182 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2019-09-20 13:26:05,183 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-09-20 13:26:05,183 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 34 [2019-09-20 13:26:05,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:05,184 INFO L225 Difference]: With dead ends: 41 [2019-09-20 13:26:05,184 INFO L226 Difference]: Without dead ends: 41 [2019-09-20 13:26:05,186 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 279 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=347, Invalid=1375, Unknown=0, NotChecked=0, Total=1722 [2019-09-20 13:26:05,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-09-20 13:26:05,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2019-09-20 13:26:05,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-09-20 13:26:05,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2019-09-20 13:26:05,190 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 34 [2019-09-20 13:26:05,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:05,191 INFO L475 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2019-09-20 13:26:05,191 INFO L476 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-09-20 13:26:05,191 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2019-09-20 13:26:05,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-09-20 13:26:05,192 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:05,192 INFO L407 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:05,192 INFO L418 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:05,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:05,193 INFO L82 PathProgramCache]: Analyzing trace with hash -98733461, now seen corresponding path program 6 times [2019-09-20 13:26:05,193 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:05,195 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:05,195 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 13:26:05,195 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:05,195 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:05,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:05,444 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 0 proven. 115 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:26:05,445 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:05,445 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:26:05,445 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:26:05,445 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:26:05,445 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:05,445 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 [2019-09-20 13:26:05,466 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-20 13:26:05,466 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-20 13:26:05,485 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-20 13:26:05,486 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 13:26:05,486 INFO L256 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 8 conjunts are in the unsatisfiable core [2019-09-20 13:26:05,489 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:26:05,628 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 63 proven. 25 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2019-09-20 13:26:05,628 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:26:05,804 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 63 proven. 25 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (7)] Exception during sending of exit command (exit): Broken pipe [2019-09-20 13:26:05,808 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:26:05,809 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 9, 9] total 34 [2019-09-20 13:26:05,809 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:26:05,809 INFO L454 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-09-20 13:26:05,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-09-20 13:26:05,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=947, Unknown=0, NotChecked=0, Total=1122 [2019-09-20 13:26:05,810 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand 27 states. [2019-09-20 13:26:06,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:06,348 INFO L93 Difference]: Finished difference Result 45 states and 47 transitions. [2019-09-20 13:26:06,350 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-09-20 13:26:06,350 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 38 [2019-09-20 13:26:06,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:06,351 INFO L225 Difference]: With dead ends: 45 [2019-09-20 13:26:06,351 INFO L226 Difference]: Without dead ends: 45 [2019-09-20 13:26:06,353 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 389 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=455, Invalid=1801, Unknown=0, NotChecked=0, Total=2256 [2019-09-20 13:26:06,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2019-09-20 13:26:06,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2019-09-20 13:26:06,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-09-20 13:26:06,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2019-09-20 13:26:06,357 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 38 [2019-09-20 13:26:06,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:06,358 INFO L475 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2019-09-20 13:26:06,358 INFO L476 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-09-20 13:26:06,358 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2019-09-20 13:26:06,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-09-20 13:26:06,359 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:06,359 INFO L407 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:06,359 INFO L418 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:06,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:06,360 INFO L82 PathProgramCache]: Analyzing trace with hash -1878148565, now seen corresponding path program 7 times [2019-09-20 13:26:06,360 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:06,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:06,361 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 13:26:06,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:06,361 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:06,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:06,681 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:26:06,681 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:06,681 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:26:06,681 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:26:06,681 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:26:06,682 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:06,682 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 [2019-09-20 13:26:06,702 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:06,703 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-20 13:26:06,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:06,720 INFO L256 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 9 conjunts are in the unsatisfiable core [2019-09-20 13:26:06,722 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:26:06,884 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 87 proven. 36 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2019-09-20 13:26:06,884 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:26:07,080 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 87 proven. 36 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2019-09-20 13:26:07,084 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:26:07,084 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 10, 10] total 38 [2019-09-20 13:26:07,084 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:26:07,085 INFO L454 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-09-20 13:26:07,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-09-20 13:26:07,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=1189, Unknown=0, NotChecked=0, Total=1406 [2019-09-20 13:26:07,087 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand 30 states. [2019-09-20 13:26:07,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:07,742 INFO L93 Difference]: Finished difference Result 49 states and 51 transitions. [2019-09-20 13:26:07,742 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-09-20 13:26:07,743 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 42 [2019-09-20 13:26:07,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:07,744 INFO L225 Difference]: With dead ends: 49 [2019-09-20 13:26:07,744 INFO L226 Difference]: Without dead ends: 49 [2019-09-20 13:26:07,746 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 529 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=567, Invalid=2295, Unknown=0, NotChecked=0, Total=2862 [2019-09-20 13:26:07,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-09-20 13:26:07,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2019-09-20 13:26:07,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-09-20 13:26:07,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2019-09-20 13:26:07,751 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 42 [2019-09-20 13:26:07,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:07,751 INFO L475 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2019-09-20 13:26:07,751 INFO L476 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-09-20 13:26:07,752 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2019-09-20 13:26:07,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-09-20 13:26:07,752 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:07,753 INFO L407 BasicCegarLoop]: trace histogram [14, 14, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:07,753 INFO L418 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:07,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:07,753 INFO L82 PathProgramCache]: Analyzing trace with hash -1034108693, now seen corresponding path program 8 times [2019-09-20 13:26:07,753 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:07,754 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:07,755 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:07,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:07,755 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:07,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:08,049 INFO L134 CoverageAnalysis]: Checked inductivity of 215 backedges. 0 proven. 215 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:26:08,050 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:08,050 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:26:08,050 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:26:08,050 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:26:08,051 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:08,051 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 [2019-09-20 13:26:08,079 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-20 13:26:08,079 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-20 13:26:08,113 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2019-09-20 13:26:08,113 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 13:26:08,114 INFO L256 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 10 conjunts are in the unsatisfiable core [2019-09-20 13:26:08,117 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:26:08,320 INFO L134 CoverageAnalysis]: Checked inductivity of 215 backedges. 116 proven. 49 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2019-09-20 13:26:08,320 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:26:08,532 INFO L134 CoverageAnalysis]: Checked inductivity of 215 backedges. 3 proven. 162 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2019-09-20 13:26:08,537 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:26:08,537 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 11, 11] total 42 [2019-09-20 13:26:08,537 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:26:08,538 INFO L454 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-09-20 13:26:08,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-09-20 13:26:08,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=261, Invalid=1461, Unknown=0, NotChecked=0, Total=1722 [2019-09-20 13:26:08,540 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand 33 states. [2019-09-20 13:26:09,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:09,460 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2019-09-20 13:26:09,460 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-09-20 13:26:09,460 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 46 [2019-09-20 13:26:09,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:09,461 INFO L225 Difference]: With dead ends: 53 [2019-09-20 13:26:09,461 INFO L226 Difference]: Without dead ends: 53 [2019-09-20 13:26:09,463 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 697 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=686, Invalid=2854, Unknown=0, NotChecked=0, Total=3540 [2019-09-20 13:26:09,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-09-20 13:26:09,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2019-09-20 13:26:09,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2019-09-20 13:26:09,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2019-09-20 13:26:09,467 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 46 [2019-09-20 13:26:09,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:09,468 INFO L475 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2019-09-20 13:26:09,468 INFO L476 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-09-20 13:26:09,468 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2019-09-20 13:26:09,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-09-20 13:26:09,469 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:09,469 INFO L407 BasicCegarLoop]: trace histogram [16, 16, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:09,469 INFO L418 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:09,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:09,470 INFO L82 PathProgramCache]: Analyzing trace with hash -2048440661, now seen corresponding path program 9 times [2019-09-20 13:26:09,470 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:09,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:09,471 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 13:26:09,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:09,472 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:09,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:09,772 INFO L134 CoverageAnalysis]: Checked inductivity of 277 backedges. 0 proven. 277 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:26:09,772 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:09,772 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:26:09,772 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:26:09,773 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:26:09,773 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:09,773 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 [2019-09-20 13:26:09,804 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-20 13:26:09,804 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-20 13:26:09,835 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-20 13:26:09,836 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 13:26:09,836 INFO L256 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 11 conjunts are in the unsatisfiable core [2019-09-20 13:26:09,839 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:26:10,064 INFO L134 CoverageAnalysis]: Checked inductivity of 277 backedges. 147 proven. 64 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-09-20 13:26:10,065 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:26:10,285 INFO L134 CoverageAnalysis]: Checked inductivity of 277 backedges. 147 proven. 64 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-09-20 13:26:10,289 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:26:10,289 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 12, 12] total 46 [2019-09-20 13:26:10,289 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:26:10,290 INFO L454 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-09-20 13:26:10,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-09-20 13:26:10,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=1763, Unknown=0, NotChecked=0, Total=2070 [2019-09-20 13:26:10,292 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand 36 states. [2019-09-20 13:26:11,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:11,272 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2019-09-20 13:26:11,273 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-09-20 13:26:11,273 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 50 [2019-09-20 13:26:11,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:11,274 INFO L225 Difference]: With dead ends: 57 [2019-09-20 13:26:11,274 INFO L226 Difference]: Without dead ends: 57 [2019-09-20 13:26:11,275 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 893 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=813, Invalid=3477, Unknown=0, NotChecked=0, Total=4290 [2019-09-20 13:26:11,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2019-09-20 13:26:11,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2019-09-20 13:26:11,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-09-20 13:26:11,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2019-09-20 13:26:11,281 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 50 [2019-09-20 13:26:11,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:11,281 INFO L475 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2019-09-20 13:26:11,281 INFO L476 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-09-20 13:26:11,281 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2019-09-20 13:26:11,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-09-20 13:26:11,282 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:11,282 INFO L407 BasicCegarLoop]: trace histogram [18, 18, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:11,282 INFO L418 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:11,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:11,283 INFO L82 PathProgramCache]: Analyzing trace with hash -820376725, now seen corresponding path program 10 times [2019-09-20 13:26:11,283 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:11,284 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:11,284 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 13:26:11,285 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:11,285 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:11,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:11,675 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 0 proven. 347 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:26:11,676 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:11,676 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:26:11,676 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:26:11,676 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:26:11,676 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:11,677 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 [2019-09-20 13:26:11,735 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:11,735 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-20 13:26:11,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:11,767 INFO L256 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 12 conjunts are in the unsatisfiable core [2019-09-20 13:26:11,769 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:26:12,178 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 183 proven. 81 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2019-09-20 13:26:12,180 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:26:12,460 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 183 proven. 81 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (11)] Exception during sending of exit command (exit): Broken pipe [2019-09-20 13:26:12,468 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:26:12,468 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 13, 13] total 49 [2019-09-20 13:26:12,469 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:26:12,469 INFO L454 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-09-20 13:26:12,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-09-20 13:26:12,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=342, Invalid=2010, Unknown=0, NotChecked=0, Total=2352 [2019-09-20 13:26:12,471 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand 39 states. [2019-09-20 13:26:13,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:13,585 INFO L93 Difference]: Finished difference Result 61 states and 63 transitions. [2019-09-20 13:26:13,585 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-09-20 13:26:13,585 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 54 [2019-09-20 13:26:13,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:13,586 INFO L225 Difference]: With dead ends: 61 [2019-09-20 13:26:13,586 INFO L226 Difference]: Without dead ends: 61 [2019-09-20 13:26:13,588 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 87 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1129 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=992, Invalid=4120, Unknown=0, NotChecked=0, Total=5112 [2019-09-20 13:26:13,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-09-20 13:26:13,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2019-09-20 13:26:13,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-09-20 13:26:13,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2019-09-20 13:26:13,593 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 54 [2019-09-20 13:26:13,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:13,593 INFO L475 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2019-09-20 13:26:13,593 INFO L476 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-09-20 13:26:13,593 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2019-09-20 13:26:13,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-09-20 13:26:13,594 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:13,594 INFO L407 BasicCegarLoop]: trace histogram [20, 20, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:13,594 INFO L418 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:13,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:13,595 INFO L82 PathProgramCache]: Analyzing trace with hash 233951019, now seen corresponding path program 11 times [2019-09-20 13:26:13,595 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:13,596 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:13,596 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:13,596 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:13,596 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:13,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:13,653 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2019-09-20 13:26:13,653 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:13,653 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:26:13,653 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:26:13,653 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:26:13,653 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:13,654 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 [2019-09-20 13:26:13,685 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-20 13:26:13,685 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-20 13:26:13,727 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2019-09-20 13:26:13,727 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 13:26:13,728 INFO L256 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 5 conjunts are in the unsatisfiable core [2019-09-20 13:26:13,730 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:26:13,774 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2019-09-20 13:26:13,774 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:26:13,818 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2019-09-20 13:26:13,822 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:26:13,822 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 13 [2019-09-20 13:26:13,823 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:26:13,823 INFO L454 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-09-20 13:26:13,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-09-20 13:26:13,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=93, Unknown=0, NotChecked=0, Total=156 [2019-09-20 13:26:13,825 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand 9 states. [2019-09-20 13:26:13,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:13,871 INFO L93 Difference]: Finished difference Result 104 states and 108 transitions. [2019-09-20 13:26:13,871 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-20 13:26:13,872 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 58 [2019-09-20 13:26:13,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:13,873 INFO L225 Difference]: With dead ends: 104 [2019-09-20 13:26:13,873 INFO L226 Difference]: Without dead ends: 104 [2019-09-20 13:26:13,875 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=63, Invalid=93, Unknown=0, NotChecked=0, Total=156 [2019-09-20 13:26:13,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2019-09-20 13:26:13,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 82. [2019-09-20 13:26:13,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2019-09-20 13:26:13,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 85 transitions. [2019-09-20 13:26:13,891 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 85 transitions. Word has length 58 [2019-09-20 13:26:13,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:13,895 INFO L475 AbstractCegarLoop]: Abstraction has 82 states and 85 transitions. [2019-09-20 13:26:13,895 INFO L476 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-09-20 13:26:13,896 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 85 transitions. [2019-09-20 13:26:13,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2019-09-20 13:26:13,897 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:13,897 INFO L407 BasicCegarLoop]: trace histogram [30, 30, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:13,898 INFO L418 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:13,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:13,898 INFO L82 PathProgramCache]: Analyzing trace with hash 1348099759, now seen corresponding path program 12 times [2019-09-20 13:26:13,898 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:13,899 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:13,900 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 13:26:13,900 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:13,900 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:13,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:14,062 INFO L134 CoverageAnalysis]: Checked inductivity of 972 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2019-09-20 13:26:14,062 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:14,063 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:26:14,063 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:26:14,063 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:26:14,063 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:14,063 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 [2019-09-20 13:26:14,111 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-20 13:26:14,111 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-20 13:26:14,145 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-20 13:26:14,145 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 13:26:14,147 INFO L256 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 6 conjunts are in the unsatisfiable core [2019-09-20 13:26:14,149 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:26:14,277 INFO L134 CoverageAnalysis]: Checked inductivity of 972 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2019-09-20 13:26:14,278 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:26:14,328 INFO L134 CoverageAnalysis]: Checked inductivity of 972 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2019-09-20 13:26:14,332 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:26:14,332 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 16 [2019-09-20 13:26:14,332 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:26:14,332 INFO L454 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-09-20 13:26:14,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-09-20 13:26:14,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=142, Unknown=0, NotChecked=0, Total=240 [2019-09-20 13:26:14,333 INFO L87 Difference]: Start difference. First operand 82 states and 85 transitions. Second operand 11 states. [2019-09-20 13:26:14,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:14,368 INFO L93 Difference]: Finished difference Result 127 states and 132 transitions. [2019-09-20 13:26:14,368 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-09-20 13:26:14,368 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 81 [2019-09-20 13:26:14,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:14,370 INFO L225 Difference]: With dead ends: 127 [2019-09-20 13:26:14,370 INFO L226 Difference]: Without dead ends: 127 [2019-09-20 13:26:14,371 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=98, Invalid=142, Unknown=0, NotChecked=0, Total=240 [2019-09-20 13:26:14,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2019-09-20 13:26:14,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 105. [2019-09-20 13:26:14,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2019-09-20 13:26:14,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 109 transitions. [2019-09-20 13:26:14,377 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 109 transitions. Word has length 81 [2019-09-20 13:26:14,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:14,377 INFO L475 AbstractCegarLoop]: Abstraction has 105 states and 109 transitions. [2019-09-20 13:26:14,378 INFO L476 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-09-20 13:26:14,378 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 109 transitions. [2019-09-20 13:26:14,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2019-09-20 13:26:14,379 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:14,379 INFO L407 BasicCegarLoop]: trace histogram [40, 40, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:14,379 INFO L418 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:14,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:14,380 INFO L82 PathProgramCache]: Analyzing trace with hash -1467049301, now seen corresponding path program 13 times [2019-09-20 13:26:14,380 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:14,381 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:14,382 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 13:26:14,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:14,382 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:14,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:14,482 INFO L134 CoverageAnalysis]: Checked inductivity of 1742 backedges. 0 proven. 1342 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2019-09-20 13:26:14,483 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:14,483 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:26:14,483 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:26:14,483 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:26:14,483 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:14,484 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 [2019-09-20 13:26:14,528 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:14,528 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-20 13:26:14,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:14,571 INFO L256 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 7 conjunts are in the unsatisfiable core [2019-09-20 13:26:14,573 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:26:14,666 INFO L134 CoverageAnalysis]: Checked inductivity of 1742 backedges. 0 proven. 1342 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2019-09-20 13:26:14,666 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:26:14,738 INFO L134 CoverageAnalysis]: Checked inductivity of 1742 backedges. 0 proven. 1342 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2019-09-20 13:26:14,752 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:26:14,753 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 19 [2019-09-20 13:26:14,753 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:26:14,753 INFO L454 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-09-20 13:26:14,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-09-20 13:26:14,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=201, Unknown=0, NotChecked=0, Total=342 [2019-09-20 13:26:14,754 INFO L87 Difference]: Start difference. First operand 105 states and 109 transitions. Second operand 13 states. [2019-09-20 13:26:14,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:14,792 INFO L93 Difference]: Finished difference Result 150 states and 156 transitions. [2019-09-20 13:26:14,792 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-09-20 13:26:14,792 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 104 [2019-09-20 13:26:14,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:14,793 INFO L225 Difference]: With dead ends: 150 [2019-09-20 13:26:14,793 INFO L226 Difference]: Without dead ends: 150 [2019-09-20 13:26:14,794 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 198 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=141, Invalid=201, Unknown=0, NotChecked=0, Total=342 [2019-09-20 13:26:14,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2019-09-20 13:26:14,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 128. [2019-09-20 13:26:14,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2019-09-20 13:26:14,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 133 transitions. [2019-09-20 13:26:14,803 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 133 transitions. Word has length 104 [2019-09-20 13:26:14,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:14,805 INFO L475 AbstractCegarLoop]: Abstraction has 128 states and 133 transitions. [2019-09-20 13:26:14,806 INFO L476 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-09-20 13:26:14,806 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 133 transitions. [2019-09-20 13:26:14,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2019-09-20 13:26:14,807 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:14,808 INFO L407 BasicCegarLoop]: trace histogram [50, 50, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:14,808 INFO L418 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:14,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:14,812 INFO L82 PathProgramCache]: Analyzing trace with hash -1018125521, now seen corresponding path program 14 times [2019-09-20 13:26:14,812 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:14,814 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:14,814 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:14,814 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:14,815 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:14,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:14,947 INFO L134 CoverageAnalysis]: Checked inductivity of 2735 backedges. 0 proven. 2235 refuted. 0 times theorem prover too weak. 500 trivial. 0 not checked. [2019-09-20 13:26:14,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:14,948 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:26:14,948 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:26:14,948 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:26:14,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:14,948 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 [2019-09-20 13:26:15,006 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-20 13:26:15,006 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-20 13:26:15,132 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2019-09-20 13:26:15,133 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 13:26:15,134 INFO L256 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 8 conjunts are in the unsatisfiable core [2019-09-20 13:26:15,137 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:26:15,253 INFO L134 CoverageAnalysis]: Checked inductivity of 2735 backedges. 0 proven. 2235 refuted. 0 times theorem prover too weak. 500 trivial. 0 not checked. [2019-09-20 13:26:15,253 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:26:15,380 INFO L134 CoverageAnalysis]: Checked inductivity of 2735 backedges. 0 proven. 2235 refuted. 0 times theorem prover too weak. 500 trivial. 0 not checked. [2019-09-20 13:26:15,392 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:26:15,393 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 20 [2019-09-20 13:26:15,393 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:26:15,393 INFO L454 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-09-20 13:26:15,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-09-20 13:26:15,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=225, Unknown=0, NotChecked=0, Total=380 [2019-09-20 13:26:15,394 INFO L87 Difference]: Start difference. First operand 128 states and 133 transitions. Second operand 15 states. [2019-09-20 13:26:15,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:15,436 INFO L93 Difference]: Finished difference Result 173 states and 180 transitions. [2019-09-20 13:26:15,436 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-09-20 13:26:15,436 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 127 [2019-09-20 13:26:15,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:15,437 INFO L225 Difference]: With dead ends: 173 [2019-09-20 13:26:15,438 INFO L226 Difference]: Without dead ends: 173 [2019-09-20 13:26:15,438 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 242 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=225, Unknown=0, NotChecked=0, Total=380 [2019-09-20 13:26:15,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2019-09-20 13:26:15,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 151. [2019-09-20 13:26:15,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2019-09-20 13:26:15,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 157 transitions. [2019-09-20 13:26:15,444 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 157 transitions. Word has length 127 [2019-09-20 13:26:15,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:15,445 INFO L475 AbstractCegarLoop]: Abstraction has 151 states and 157 transitions. [2019-09-20 13:26:15,445 INFO L476 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-09-20 13:26:15,445 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 157 transitions. [2019-09-20 13:26:15,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2019-09-20 13:26:15,447 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:15,447 INFO L407 BasicCegarLoop]: trace histogram [60, 60, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:15,447 INFO L418 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:15,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:15,448 INFO L82 PathProgramCache]: Analyzing trace with hash -1416411605, now seen corresponding path program 15 times [2019-09-20 13:26:15,448 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:15,449 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:15,449 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 13:26:15,450 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:15,450 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:15,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:15,621 INFO L134 CoverageAnalysis]: Checked inductivity of 3951 backedges. 0 proven. 3351 refuted. 0 times theorem prover too weak. 600 trivial. 0 not checked. [2019-09-20 13:26:15,622 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:15,622 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:26:15,622 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:26:15,622 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:26:15,622 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:15,622 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 [2019-09-20 13:26:15,662 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-20 13:26:15,662 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-20 13:26:15,720 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-20 13:26:15,721 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 13:26:15,722 INFO L256 TraceCheckSpWp]: Trace formula consists of 372 conjuncts, 9 conjunts are in the unsatisfiable core [2019-09-20 13:26:15,725 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:26:15,838 INFO L134 CoverageAnalysis]: Checked inductivity of 3951 backedges. 0 proven. 3351 refuted. 0 times theorem prover too weak. 600 trivial. 0 not checked. [2019-09-20 13:26:15,839 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:26:15,929 INFO L134 CoverageAnalysis]: Checked inductivity of 3951 backedges. 0 proven. 3351 refuted. 0 times theorem prover too weak. 600 trivial. 0 not checked. [2019-09-20 13:26:15,932 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:26:15,932 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 21 [2019-09-20 13:26:15,932 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:26:15,933 INFO L454 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-09-20 13:26:15,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-09-20 13:26:15,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=251, Unknown=0, NotChecked=0, Total=420 [2019-09-20 13:26:15,933 INFO L87 Difference]: Start difference. First operand 151 states and 157 transitions. Second operand 17 states. [2019-09-20 13:26:15,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:15,981 INFO L93 Difference]: Finished difference Result 196 states and 204 transitions. [2019-09-20 13:26:15,981 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-09-20 13:26:15,981 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 150 [2019-09-20 13:26:15,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:15,983 INFO L225 Difference]: With dead ends: 196 [2019-09-20 13:26:15,983 INFO L226 Difference]: Without dead ends: 196 [2019-09-20 13:26:15,984 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 309 GetRequests, 286 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 219 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=169, Invalid=251, Unknown=0, NotChecked=0, Total=420 [2019-09-20 13:26:15,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2019-09-20 13:26:15,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 174. [2019-09-20 13:26:15,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2019-09-20 13:26:15,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 181 transitions. [2019-09-20 13:26:15,990 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 181 transitions. Word has length 150 [2019-09-20 13:26:15,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:15,992 INFO L475 AbstractCegarLoop]: Abstraction has 174 states and 181 transitions. [2019-09-20 13:26:15,992 INFO L476 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-09-20 13:26:15,993 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 181 transitions. [2019-09-20 13:26:15,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2019-09-20 13:26:15,995 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:15,995 INFO L407 BasicCegarLoop]: trace histogram [70, 70, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:15,995 INFO L418 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:15,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:15,995 INFO L82 PathProgramCache]: Analyzing trace with hash -1492973649, now seen corresponding path program 16 times [2019-09-20 13:26:15,996 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:15,998 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:15,998 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 13:26:15,998 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:15,998 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:16,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:16,218 INFO L134 CoverageAnalysis]: Checked inductivity of 5390 backedges. 0 proven. 4690 refuted. 0 times theorem prover too weak. 700 trivial. 0 not checked. [2019-09-20 13:26:16,218 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:16,218 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:26:16,219 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:26:16,219 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:26:16,219 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:16,219 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 [2019-09-20 13:26:16,260 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:16,261 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-20 13:26:16,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:16,333 INFO L256 TraceCheckSpWp]: Trace formula consists of 428 conjuncts, 10 conjunts are in the unsatisfiable core [2019-09-20 13:26:16,337 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:26:16,476 INFO L134 CoverageAnalysis]: Checked inductivity of 5390 backedges. 0 proven. 4690 refuted. 0 times theorem prover too weak. 700 trivial. 0 not checked. [2019-09-20 13:26:16,477 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:26:16,598 INFO L134 CoverageAnalysis]: Checked inductivity of 5390 backedges. 0 proven. 4690 refuted. 0 times theorem prover too weak. 700 trivial. 0 not checked. [2019-09-20 13:26:16,602 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:26:16,602 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 22 [2019-09-20 13:26:16,603 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:26:16,603 INFO L454 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-09-20 13:26:16,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-09-20 13:26:16,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=279, Unknown=0, NotChecked=0, Total=462 [2019-09-20 13:26:16,604 INFO L87 Difference]: Start difference. First operand 174 states and 181 transitions. Second operand 19 states. [2019-09-20 13:26:16,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:16,650 INFO L93 Difference]: Finished difference Result 219 states and 228 transitions. [2019-09-20 13:26:16,650 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-09-20 13:26:16,650 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 173 [2019-09-20 13:26:16,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:16,652 INFO L225 Difference]: With dead ends: 219 [2019-09-20 13:26:16,652 INFO L226 Difference]: Without dead ends: 219 [2019-09-20 13:26:16,653 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 330 SyntacticMatches, 6 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=183, Invalid=279, Unknown=0, NotChecked=0, Total=462 [2019-09-20 13:26:16,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2019-09-20 13:26:16,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 197. [2019-09-20 13:26:16,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2019-09-20 13:26:16,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 205 transitions. [2019-09-20 13:26:16,658 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 205 transitions. Word has length 173 [2019-09-20 13:26:16,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:16,659 INFO L475 AbstractCegarLoop]: Abstraction has 197 states and 205 transitions. [2019-09-20 13:26:16,659 INFO L476 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-09-20 13:26:16,659 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 205 transitions. [2019-09-20 13:26:16,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2019-09-20 13:26:16,661 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:16,661 INFO L407 BasicCegarLoop]: trace histogram [80, 80, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:16,662 INFO L418 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:16,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:16,662 INFO L82 PathProgramCache]: Analyzing trace with hash 1547162027, now seen corresponding path program 17 times [2019-09-20 13:26:16,662 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:16,666 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:16,666 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:26:16,666 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:16,667 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:16,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:16,965 INFO L134 CoverageAnalysis]: Checked inductivity of 7052 backedges. 0 proven. 6252 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2019-09-20 13:26:16,965 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:16,965 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:26:16,966 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:26:16,966 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:26:16,966 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:16,966 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 [2019-09-20 13:26:17,030 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-20 13:26:17,030 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-20 13:26:17,231 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 69 check-sat command(s) [2019-09-20 13:26:17,232 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 13:26:17,234 INFO L256 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 11 conjunts are in the unsatisfiable core [2019-09-20 13:26:17,239 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:26:17,444 INFO L134 CoverageAnalysis]: Checked inductivity of 7052 backedges. 0 proven. 6252 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2019-09-20 13:26:17,444 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:26:17,577 INFO L134 CoverageAnalysis]: Checked inductivity of 7052 backedges. 0 proven. 6252 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2019-09-20 13:26:17,583 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:26:17,583 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2019-09-20 13:26:17,583 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:26:17,584 INFO L454 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-09-20 13:26:17,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-09-20 13:26:17,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=309, Unknown=0, NotChecked=0, Total=506 [2019-09-20 13:26:17,584 INFO L87 Difference]: Start difference. First operand 197 states and 205 transitions. Second operand 21 states. [2019-09-20 13:26:17,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:17,634 INFO L93 Difference]: Finished difference Result 242 states and 252 transitions. [2019-09-20 13:26:17,635 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-09-20 13:26:17,635 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 196 [2019-09-20 13:26:17,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:17,636 INFO L225 Difference]: With dead ends: 242 [2019-09-20 13:26:17,636 INFO L226 Difference]: Without dead ends: 242 [2019-09-20 13:26:17,637 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 374 SyntacticMatches, 8 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 341 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=197, Invalid=309, Unknown=0, NotChecked=0, Total=506 [2019-09-20 13:26:17,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2019-09-20 13:26:17,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 220. [2019-09-20 13:26:17,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2019-09-20 13:26:17,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 229 transitions. [2019-09-20 13:26:17,643 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 229 transitions. Word has length 196 [2019-09-20 13:26:17,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:17,643 INFO L475 AbstractCegarLoop]: Abstraction has 220 states and 229 transitions. [2019-09-20 13:26:17,643 INFO L476 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-09-20 13:26:17,643 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 229 transitions. [2019-09-20 13:26:17,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2019-09-20 13:26:17,646 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:17,646 INFO L407 BasicCegarLoop]: trace histogram [90, 90, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:17,646 INFO L418 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:17,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:17,647 INFO L82 PathProgramCache]: Analyzing trace with hash 1463389231, now seen corresponding path program 18 times [2019-09-20 13:26:17,647 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:17,648 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:17,648 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 13:26:17,648 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:17,649 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:17,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:17,877 INFO L134 CoverageAnalysis]: Checked inductivity of 8937 backedges. 0 proven. 8037 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2019-09-20 13:26:17,877 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:17,877 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:26:17,878 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:26:17,878 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:26:17,878 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:26:17,878 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 [2019-09-20 13:26:17,920 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-20 13:26:17,920 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-20 13:26:18,023 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-20 13:26:18,024 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 13:26:18,026 INFO L256 TraceCheckSpWp]: Trace formula consists of 540 conjuncts, 12 conjunts are in the unsatisfiable core [2019-09-20 13:26:18,045 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:26:18,219 INFO L134 CoverageAnalysis]: Checked inductivity of 8937 backedges. 0 proven. 8037 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2019-09-20 13:26:18,219 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:26:18,352 INFO L134 CoverageAnalysis]: Checked inductivity of 8937 backedges. 0 proven. 8037 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (19)] Exception during sending of exit command (exit): Broken pipe [2019-09-20 13:26:18,357 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:26:18,357 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 23 [2019-09-20 13:26:18,357 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:26:18,358 INFO L454 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-09-20 13:26:18,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-09-20 13:26:18,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=308, Unknown=0, NotChecked=0, Total=506 [2019-09-20 13:26:18,359 INFO L87 Difference]: Start difference. First operand 220 states and 229 transitions. Second operand 23 states. [2019-09-20 13:26:18,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:18,426 INFO L93 Difference]: Finished difference Result 265 states and 276 transitions. [2019-09-20 13:26:18,426 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-09-20 13:26:18,426 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 219 [2019-09-20 13:26:18,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:18,428 INFO L225 Difference]: With dead ends: 265 [2019-09-20 13:26:18,428 INFO L226 Difference]: Without dead ends: 265 [2019-09-20 13:26:18,429 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 451 GetRequests, 418 SyntacticMatches, 11 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 399 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=340, Unknown=0, NotChecked=0, Total=552 [2019-09-20 13:26:18,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2019-09-20 13:26:18,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 243. [2019-09-20 13:26:18,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 243 states. [2019-09-20 13:26:18,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 253 transitions. [2019-09-20 13:26:18,435 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 253 transitions. Word has length 219 [2019-09-20 13:26:18,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:18,435 INFO L475 AbstractCegarLoop]: Abstraction has 243 states and 253 transitions. [2019-09-20 13:26:18,436 INFO L476 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-09-20 13:26:18,436 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 253 transitions. [2019-09-20 13:26:18,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2019-09-20 13:26:18,439 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:26:18,439 INFO L407 BasicCegarLoop]: trace histogram [100, 100, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:26:18,439 INFO L418 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:26:18,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:26:18,440 INFO L82 PathProgramCache]: Analyzing trace with hash -1649132245, now seen corresponding path program 19 times [2019-09-20 13:26:18,440 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:26:18,449 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:18,449 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 13:26:18,449 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:26:18,449 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:26:18,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:26:23,888 INFO L134 CoverageAnalysis]: Checked inductivity of 11045 backedges. 11036 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-09-20 13:26:23,889 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-20 13:26:23,889 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [105] imperfect sequences [] total 105 [2019-09-20 13:26:23,889 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-20 13:26:23,890 INFO L454 AbstractCegarLoop]: Interpolant automaton has 105 states [2019-09-20 13:26:23,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2019-09-20 13:26:23,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5257, Invalid=5663, Unknown=0, NotChecked=0, Total=10920 [2019-09-20 13:26:23,894 INFO L87 Difference]: Start difference. First operand 243 states and 253 transitions. Second operand 105 states. [2019-09-20 13:26:25,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:26:25,081 INFO L93 Difference]: Finished difference Result 9781 states and 10241 transitions. [2019-09-20 13:26:25,081 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2019-09-20 13:26:25,081 INFO L78 Accepts]: Start accepts. Automaton has 105 states. Word has length 242 [2019-09-20 13:26:25,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:26:25,082 INFO L225 Difference]: With dead ends: 9781 [2019-09-20 13:26:25,082 INFO L226 Difference]: Without dead ends: 0 [2019-09-20 13:26:25,087 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=5261, Invalid=5869, Unknown=0, NotChecked=0, Total=11130 [2019-09-20 13:26:25,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-09-20 13:26:25,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-09-20 13:26:25,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-09-20 13:26:25,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-09-20 13:26:25,088 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 242 [2019-09-20 13:26:25,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:26:25,088 INFO L475 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-09-20 13:26:25,088 INFO L476 AbstractCegarLoop]: Interpolant automaton has 105 states. [2019-09-20 13:26:25,089 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-09-20 13:26:25,089 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-09-20 13:26:25,096 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.09 01:26:25 BoogieIcfgContainer [2019-09-20 13:26:25,096 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-09-20 13:26:25,099 INFO L168 Benchmark]: Toolchain (without parser) took 25377.35 ms. Allocated memory was 138.9 MB in the beginning and 533.7 MB in the end (delta: 394.8 MB). Free memory was 86.1 MB in the beginning and 289.8 MB in the end (delta: -203.7 MB). Peak memory consumption was 191.1 MB. Max. memory is 7.1 GB. [2019-09-20 13:26:25,100 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 138.9 MB. Free memory is still 104.6 MB. There was no memory consumed. Max. memory is 7.1 GB. [2019-09-20 13:26:25,106 INFO L168 Benchmark]: CACSL2BoogieTranslator took 309.11 ms. Allocated memory is still 138.9 MB. Free memory was 86.1 MB in the beginning and 76.5 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2019-09-20 13:26:25,108 INFO L168 Benchmark]: Boogie Preprocessor took 129.09 ms. Allocated memory was 138.9 MB in the beginning and 199.8 MB in the end (delta: 60.8 MB). Free memory was 76.5 MB in the beginning and 176.5 MB in the end (delta: -100.0 MB). Peak memory consumption was 11.4 MB. Max. memory is 7.1 GB. [2019-09-20 13:26:25,109 INFO L168 Benchmark]: RCFGBuilder took 254.71 ms. Allocated memory is still 199.8 MB. Free memory was 176.5 MB in the beginning and 163.5 MB in the end (delta: 13.0 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. [2019-09-20 13:26:25,110 INFO L168 Benchmark]: TraceAbstraction took 24680.14 ms. Allocated memory was 199.8 MB in the beginning and 533.7 MB in the end (delta: 334.0 MB). Free memory was 163.5 MB in the beginning and 289.8 MB in the end (delta: -126.3 MB). Peak memory consumption was 207.7 MB. Max. memory is 7.1 GB. [2019-09-20 13:26:25,118 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 138.9 MB. Free memory is still 104.6 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 309.11 ms. Allocated memory is still 138.9 MB. Free memory was 86.1 MB in the beginning and 76.5 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 129.09 ms. Allocated memory was 138.9 MB in the beginning and 199.8 MB in the end (delta: 60.8 MB). Free memory was 76.5 MB in the beginning and 176.5 MB in the end (delta: -100.0 MB). Peak memory consumption was 11.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 254.71 ms. Allocated memory is still 199.8 MB. Free memory was 176.5 MB in the beginning and 163.5 MB in the end (delta: 13.0 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 24680.14 ms. Allocated memory was 199.8 MB in the beginning and 533.7 MB in the end (delta: 334.0 MB). Free memory was 163.5 MB in the beginning and 289.8 MB in the end (delta: -126.3 MB). Peak memory consumption was 207.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 5]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 23 locations, 1 error locations. SAFE Result, 24.6s OverallTime, 21 OverallIterations, 100 TraceHistogramMax, 7.7s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 646 SDtfs, 1475 SDslu, 3718 SDs, 0 SdLazy, 2663 SolverSat, 428 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 3422 GetRequests, 2709 SyntacticMatches, 32 SemanticMatches, 681 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6235 ImplicationChecksByTransitivity, 15.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=243occurred in iteration=20, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.1s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 21 MinimizatonAttempts, 221 StatesRemovedByMinimization, 20 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.2s SsaConstructionTime, 1.2s SatisfiabilityAnalysisTime, 13.5s InterpolantComputationTime, 3197 NumberOfCodeBlocks, 3193 NumberOfCodeBlocksAsserted, 207 NumberOfCheckSat, 4604 ConstructedInterpolants, 0 QuantifiedInterpolants, 3136908 SizeOfPredicates, 52 NumberOfNonLiveVariables, 3665 ConjunctsInSsa, 144 ConjunctsInUnsatCore, 57 InterpolantComputations, 3 PerfectInterpolantSequences, 26062/108471 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...