java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/count_up_down-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c6af20d [2019-09-03 19:19:43,133 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-03 19:19:43,135 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-03 19:19:43,148 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-09-03 19:19:43,158 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-03 19:19:43,159 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-03 19:19:43,160 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-03 19:19:43,162 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-03 19:19:43,163 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-03 19:19:43,164 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-03 19:19:43,165 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-03 19:19:43,167 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-03 19:19:43,169 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-03 19:19:43,170 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-03 19:19:43,172 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-03 19:19:43,172 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-03 19:19:43,175 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-09-03 19:19:43,183 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-03 19:19:43,184 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-03 19:19:43,185 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-03 19:19:43,186 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-09-03 19:19:43,201 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-03 19:19:43,201 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-03 19:19:43,203 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-09-03 19:19:43,203 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-09-03 19:19:43,203 INFO L138 SettingsManager]: * Use SBE=true [2019-09-03 19:19:43,203 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-03 19:19:43,204 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-03 19:19:43,204 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-09-03 19:19:43,204 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-03 19:19:43,204 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-03 19:19:43,204 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-03 19:19:43,204 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-03 19:19:43,205 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-03 19:19:43,205 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-03 19:19:43,205 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-03 19:19:43,205 INFO L138 SettingsManager]: * Use constant arrays=true [2019-09-03 19:19:43,205 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-03 19:19:43,206 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-03 19:19:43,206 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-03 19:19:43,206 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-09-03 19:19:43,206 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-09-03 19:19:43,207 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-03 19:19:43,207 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-03 19:19:43,207 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-03 19:19:43,207 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-09-03 19:19:43,207 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-09-03 19:19:43,208 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-03 19:19:43,208 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-03 19:19:43,208 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-09-03 19:19:43,238 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-03 19:19:43,251 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-03 19:19:43,254 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-03 19:19:43,256 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-03 19:19:43,257 INFO L275 PluginConnector]: CDTParser initialized [2019-09-03 19:19:43,257 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/count_up_down-1.c [2019-09-03 19:19:43,324 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0ac06f698/4030d100a2154bc48765ce4edaa7636f/FLAG33c26543c [2019-09-03 19:19:43,753 INFO L306 CDTParser]: Found 1 translation units. [2019-09-03 19:19:43,754 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/count_up_down-1.c [2019-09-03 19:19:43,759 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0ac06f698/4030d100a2154bc48765ce4edaa7636f/FLAG33c26543c [2019-09-03 19:19:44,174 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0ac06f698/4030d100a2154bc48765ce4edaa7636f [2019-09-03 19:19:44,189 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-03 19:19:44,191 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-03 19:19:44,192 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-03 19:19:44,192 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-03 19:19:44,198 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-03 19:19:44,199 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.09 07:19:44" (1/1) ... [2019-09-03 19:19:44,202 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2aaddbe2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:19:44, skipping insertion in model container [2019-09-03 19:19:44,203 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.09 07:19:44" (1/1) ... [2019-09-03 19:19:44,211 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-03 19:19:44,230 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-03 19:19:44,425 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-03 19:19:44,436 INFO L188 MainTranslator]: Completed pre-run [2019-09-03 19:19:44,458 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-03 19:19:44,476 INFO L192 MainTranslator]: Completed translation [2019-09-03 19:19:44,477 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:19:44 WrapperNode [2019-09-03 19:19:44,477 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-03 19:19:44,478 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-03 19:19:44,478 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-03 19:19:44,479 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-03 19:19:44,590 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:19:44" (1/1) ... [2019-09-03 19:19:44,590 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:19:44" (1/1) ... [2019-09-03 19:19:44,596 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:19:44" (1/1) ... [2019-09-03 19:19:44,596 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:19:44" (1/1) ... [2019-09-03 19:19:44,604 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:19:44" (1/1) ... [2019-09-03 19:19:44,608 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:19:44" (1/1) ... [2019-09-03 19:19:44,609 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:19:44" (1/1) ... [2019-09-03 19:19:44,611 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-03 19:19:44,611 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-03 19:19:44,611 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-03 19:19:44,612 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-03 19:19:44,612 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:19:44" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-03 19:19:44,668 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-03 19:19:44,668 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-03 19:19:44,668 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-03 19:19:44,669 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-03 19:19:44,669 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-03 19:19:44,669 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-03 19:19:44,669 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2019-09-03 19:19:44,669 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-03 19:19:44,669 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-03 19:19:44,669 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-03 19:19:44,832 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-03 19:19:44,832 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-03 19:19:44,833 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.09 07:19:44 BoogieIcfgContainer [2019-09-03 19:19:44,834 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-03 19:19:44,835 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-03 19:19:44,835 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-03 19:19:44,838 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-03 19:19:44,838 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.09 07:19:44" (1/3) ... [2019-09-03 19:19:44,839 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1efdda1b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.09 07:19:44, skipping insertion in model container [2019-09-03 19:19:44,839 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:19:44" (2/3) ... [2019-09-03 19:19:44,840 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1efdda1b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.09 07:19:44, skipping insertion in model container [2019-09-03 19:19:44,840 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.09 07:19:44" (3/3) ... [2019-09-03 19:19:44,841 INFO L109 eAbstractionObserver]: Analyzing ICFG count_up_down-1.c [2019-09-03 19:19:44,851 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-03 19:19:44,861 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-03 19:19:44,879 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-03 19:19:44,912 INFO L128 ementStrategyFactory]: Using default assertion order modulation [2019-09-03 19:19:44,912 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-03 19:19:44,913 INFO L378 AbstractCegarLoop]: Hoare is true [2019-09-03 19:19:44,913 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-03 19:19:44,913 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-03 19:19:44,913 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-03 19:19:44,913 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-03 19:19:44,914 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-03 19:19:44,914 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-03 19:19:44,930 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2019-09-03 19:19:44,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-03 19:19:44,935 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:19:44,936 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:19:44,938 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:19:44,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:19:44,943 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2019-09-03 19:19:44,945 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:19:44,945 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:19:44,996 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:19:44,996 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 19:19:44,996 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:19:45,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:19:45,356 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:19:45,359 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-03 19:19:45,360 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-09-03 19:19:45,365 INFO L454 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-09-03 19:19:45,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-09-03 19:19:45,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2019-09-03 19:19:45,407 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 6 states. [2019-09-03 19:19:45,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:19:45,679 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2019-09-03 19:19:45,680 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-09-03 19:19:45,681 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2019-09-03 19:19:45,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:19:45,694 INFO L225 Difference]: With dead ends: 36 [2019-09-03 19:19:45,694 INFO L226 Difference]: Without dead ends: 12 [2019-09-03 19:19:45,702 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2019-09-03 19:19:45,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-09-03 19:19:45,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2019-09-03 19:19:45,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2019-09-03 19:19:45,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2019-09-03 19:19:45,738 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2019-09-03 19:19:45,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:19:45,739 INFO L475 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2019-09-03 19:19:45,739 INFO L476 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-09-03 19:19:45,740 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2019-09-03 19:19:45,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-09-03 19:19:45,740 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:19:45,741 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:19:45,741 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:19:45,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:19:45,742 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2019-09-03 19:19:45,742 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:19:45,742 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:19:45,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:19:45,744 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 19:19:45,744 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:19:45,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:19:46,044 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:19:46,045 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:19:46,045 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2019-09-03 19:19:46,064 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 19:19:46,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:19:46,082 WARN L254 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 16 conjunts are in the unsatisfiable core [2019-09-03 19:19:46,088 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:19:46,203 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 19:19:46,256 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:19:46,262 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:19:46,262 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2019-09-03 19:19:46,263 INFO L454 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-09-03 19:19:46,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-09-03 19:19:46,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2019-09-03 19:19:46,265 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 11 states. [2019-09-03 19:19:46,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:19:46,403 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2019-09-03 19:19:46,415 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-09-03 19:19:46,415 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 11 [2019-09-03 19:19:46,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:19:46,416 INFO L225 Difference]: With dead ends: 20 [2019-09-03 19:19:46,416 INFO L226 Difference]: Without dead ends: 14 [2019-09-03 19:19:46,418 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2019-09-03 19:19:46,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-09-03 19:19:46,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-09-03 19:19:46,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-09-03 19:19:46,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2019-09-03 19:19:46,429 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2019-09-03 19:19:46,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:19:46,429 INFO L475 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2019-09-03 19:19:46,430 INFO L476 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-09-03 19:19:46,430 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2019-09-03 19:19:46,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-09-03 19:19:46,430 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:19:46,431 INFO L399 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:19:46,431 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:19:46,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:19:46,433 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 2 times [2019-09-03 19:19:46,433 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:19:46,433 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:19:46,435 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:19:46,435 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 19:19:46,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:19:46,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:19:46,900 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:19:46,901 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:19:46,901 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-03 19:19:46,926 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:19:46,946 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-03 19:19:46,947 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:19:46,949 WARN L254 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 23 conjunts are in the unsatisfiable core [2019-09-03 19:19:46,951 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:19:47,066 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 19:19:47,122 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:19:47,126 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:19:47,126 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 13 [2019-09-03 19:19:47,127 INFO L454 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-09-03 19:19:47,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-09-03 19:19:47,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2019-09-03 19:19:47,128 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 13 states. [2019-09-03 19:19:47,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:19:47,266 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2019-09-03 19:19:47,267 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-09-03 19:19:47,267 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 13 [2019-09-03 19:19:47,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:19:47,268 INFO L225 Difference]: With dead ends: 20 [2019-09-03 19:19:47,268 INFO L226 Difference]: Without dead ends: 15 [2019-09-03 19:19:47,269 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 7 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2019-09-03 19:19:47,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-09-03 19:19:47,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-09-03 19:19:47,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-09-03 19:19:47,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2019-09-03 19:19:47,273 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2019-09-03 19:19:47,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:19:47,274 INFO L475 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2019-09-03 19:19:47,274 INFO L476 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-09-03 19:19:47,274 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2019-09-03 19:19:47,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-09-03 19:19:47,275 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:19:47,275 INFO L399 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:19:47,275 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:19:47,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:19:47,276 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 3 times [2019-09-03 19:19:47,276 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:19:47,276 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:19:47,277 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:19:47,277 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:19:47,277 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:19:47,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:19:47,670 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:19:47,671 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:19:47,671 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:19:47,688 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-03 19:19:47,719 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-09-03 19:19:47,720 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:19:47,721 WARN L254 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 29 conjunts are in the unsatisfiable core [2019-09-03 19:19:47,723 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:19:47,832 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 19:19:47,872 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:19:47,877 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:19:47,877 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2019-09-03 19:19:47,878 INFO L454 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-09-03 19:19:47,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-09-03 19:19:47,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2019-09-03 19:19:47,879 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 14 states. [2019-09-03 19:19:48,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:19:48,025 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2019-09-03 19:19:48,026 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-09-03 19:19:48,026 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 14 [2019-09-03 19:19:48,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:19:48,027 INFO L225 Difference]: With dead ends: 21 [2019-09-03 19:19:48,027 INFO L226 Difference]: Without dead ends: 16 [2019-09-03 19:19:48,028 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 7 SyntacticMatches, 4 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2019-09-03 19:19:48,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-09-03 19:19:48,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-09-03 19:19:48,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-09-03 19:19:48,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2019-09-03 19:19:48,035 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2019-09-03 19:19:48,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:19:48,035 INFO L475 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2019-09-03 19:19:48,036 INFO L476 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-09-03 19:19:48,036 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2019-09-03 19:19:48,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-09-03 19:19:48,037 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:19:48,038 INFO L399 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:19:48,039 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:19:48,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:19:48,040 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 4 times [2019-09-03 19:19:48,040 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:19:48,040 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:19:48,041 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:19:48,042 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:19:48,042 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:19:48,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:19:48,465 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:19:48,465 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:19:48,465 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:19:48,489 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-03 19:19:48,665 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 19:19:48,665 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:19:48,667 WARN L254 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 34 conjunts are in the unsatisfiable core [2019-09-03 19:19:48,669 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:19:50,839 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 19:19:50,902 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:19:50,906 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:19:50,906 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2019-09-03 19:19:50,907 INFO L454 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-09-03 19:19:50,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-09-03 19:19:50,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2019-09-03 19:19:50,908 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 19 states. [2019-09-03 19:19:52,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:19:52,827 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2019-09-03 19:19:52,828 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-09-03 19:19:52,829 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 15 [2019-09-03 19:19:52,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:19:52,830 INFO L225 Difference]: With dead ends: 22 [2019-09-03 19:19:52,830 INFO L226 Difference]: Without dead ends: 17 [2019-09-03 19:19:52,831 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=66, Invalid=354, Unknown=0, NotChecked=0, Total=420 [2019-09-03 19:19:52,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-09-03 19:19:52,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-09-03 19:19:52,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-09-03 19:19:52,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2019-09-03 19:19:52,835 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2019-09-03 19:19:52,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:19:52,835 INFO L475 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2019-09-03 19:19:52,835 INFO L476 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-09-03 19:19:52,836 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2019-09-03 19:19:52,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-09-03 19:19:52,836 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:19:52,836 INFO L399 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:19:52,837 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:19:52,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:19:52,837 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 5 times [2019-09-03 19:19:52,837 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:19:52,837 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:19:52,838 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:19:52,838 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:19:52,839 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:19:52,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:19:53,115 WARN L188 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 34 [2019-09-03 19:19:53,224 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:19:53,224 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:19:53,224 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:19:53,246 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-09-03 19:19:53,294 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2019-09-03 19:19:53,295 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:19:53,296 WARN L254 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 36 conjunts are in the unsatisfiable core [2019-09-03 19:19:53,298 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:19:53,521 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 19:19:53,575 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:19:53,578 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:19:53,579 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 21 [2019-09-03 19:19:53,580 INFO L454 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-09-03 19:19:53,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-09-03 19:19:53,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2019-09-03 19:19:53,584 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 21 states. [2019-09-03 19:19:53,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:19:53,830 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2019-09-03 19:19:53,830 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-09-03 19:19:53,830 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 16 [2019-09-03 19:19:53,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:19:53,831 INFO L225 Difference]: With dead ends: 23 [2019-09-03 19:19:53,831 INFO L226 Difference]: Without dead ends: 18 [2019-09-03 19:19:53,832 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=73, Invalid=433, Unknown=0, NotChecked=0, Total=506 [2019-09-03 19:19:53,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-09-03 19:19:53,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2019-09-03 19:19:53,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-09-03 19:19:53,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2019-09-03 19:19:53,837 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2019-09-03 19:19:53,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:19:53,837 INFO L475 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2019-09-03 19:19:53,837 INFO L476 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-09-03 19:19:53,837 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2019-09-03 19:19:53,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-09-03 19:19:53,838 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:19:53,838 INFO L399 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:19:53,838 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:19:53,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:19:53,839 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 6 times [2019-09-03 19:19:53,839 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:19:53,839 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:19:53,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:19:53,840 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:19:53,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:19:53,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:19:54,189 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:19:54,189 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:19:54,189 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:19:54,210 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-03 19:20:06,261 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2019-09-03 19:20:06,262 INFO L250 tOrderPrioritization]: Conjunction of SSA is unknown [2019-09-03 19:20:06,292 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-09-03 19:20:06,293 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2019-09-03 19:20:06,293 INFO L454 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-09-03 19:20:06,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-09-03 19:20:06,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2019-09-03 19:20:06,294 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 13 states. [2019-09-03 19:20:06,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:20:06,418 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2019-09-03 19:20:06,422 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-09-03 19:20:06,422 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 17 [2019-09-03 19:20:06,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:20:06,423 INFO L225 Difference]: With dead ends: 24 [2019-09-03 19:20:06,423 INFO L226 Difference]: Without dead ends: 19 [2019-09-03 19:20:06,424 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2019-09-03 19:20:06,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-09-03 19:20:06,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-09-03 19:20:06,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-09-03 19:20:06,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2019-09-03 19:20:06,428 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2019-09-03 19:20:06,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:20:06,428 INFO L475 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2019-09-03 19:20:06,428 INFO L476 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-09-03 19:20:06,429 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2019-09-03 19:20:06,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-09-03 19:20:06,429 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:20:06,429 INFO L399 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:20:06,430 INFO L418 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:20:06,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:20:06,430 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 7 times [2019-09-03 19:20:06,430 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:20:06,430 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:20:06,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:20:06,431 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:20:06,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:20:06,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:20:06,747 WARN L188 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 36 [2019-09-03 19:20:06,857 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:20:06,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:20:06,858 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:20:06,873 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 19:20:07,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:20:07,018 WARN L254 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 44 conjunts are in the unsatisfiable core [2019-09-03 19:20:07,019 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:20:07,313 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 19:20:07,372 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:20:07,375 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:20:07,375 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 25 [2019-09-03 19:20:07,375 INFO L454 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-09-03 19:20:07,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-09-03 19:20:07,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=525, Unknown=0, NotChecked=0, Total=600 [2019-09-03 19:20:07,376 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 25 states. [2019-09-03 19:20:07,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:20:07,602 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2019-09-03 19:20:07,602 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-09-03 19:20:07,603 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 18 [2019-09-03 19:20:07,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:20:07,604 INFO L225 Difference]: With dead ends: 25 [2019-09-03 19:20:07,604 INFO L226 Difference]: Without dead ends: 20 [2019-09-03 19:20:07,605 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2019-09-03 19:20:07,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-09-03 19:20:07,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-09-03 19:20:07,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-09-03 19:20:07,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2019-09-03 19:20:07,610 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2019-09-03 19:20:07,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:20:07,611 INFO L475 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2019-09-03 19:20:07,611 INFO L476 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-09-03 19:20:07,611 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2019-09-03 19:20:07,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-09-03 19:20:07,612 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:20:07,612 INFO L399 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:20:07,612 INFO L418 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:20:07,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:20:07,612 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 8 times [2019-09-03 19:20:07,613 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:20:07,613 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:20:07,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:20:07,614 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 19:20:07,614 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:20:07,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:20:08,048 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:20:08,048 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:20:08,048 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:20:08,065 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-03 19:20:08,180 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-03 19:20:08,181 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:20:08,182 WARN L254 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 47 conjunts are in the unsatisfiable core [2019-09-03 19:20:08,184 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:20:08,337 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 19:20:08,374 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:20:08,378 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:20:08,378 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 19 [2019-09-03 19:20:08,378 INFO L454 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-09-03 19:20:08,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-09-03 19:20:08,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2019-09-03 19:20:08,380 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 19 states. [2019-09-03 19:20:08,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:20:08,597 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2019-09-03 19:20:08,597 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-09-03 19:20:08,597 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 19 [2019-09-03 19:20:08,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:20:08,599 INFO L225 Difference]: With dead ends: 26 [2019-09-03 19:20:08,599 INFO L226 Difference]: Without dead ends: 21 [2019-09-03 19:20:08,600 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 8 SyntacticMatches, 8 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=62, Invalid=358, Unknown=0, NotChecked=0, Total=420 [2019-09-03 19:20:08,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-09-03 19:20:08,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-09-03 19:20:08,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-09-03 19:20:08,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2019-09-03 19:20:08,605 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2019-09-03 19:20:08,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:20:08,605 INFO L475 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2019-09-03 19:20:08,605 INFO L476 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-09-03 19:20:08,605 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2019-09-03 19:20:08,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-09-03 19:20:08,606 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:20:08,606 INFO L399 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:20:08,606 INFO L418 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:20:08,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:20:08,606 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 9 times [2019-09-03 19:20:08,607 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:20:08,607 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:20:08,607 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:20:08,607 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:20:08,608 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:20:08,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:20:09,045 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:20:09,046 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:20:09,046 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:20:09,055 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-03 19:20:09,134 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-09-03 19:20:09,134 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:20:09,135 WARN L254 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 53 conjunts are in the unsatisfiable core [2019-09-03 19:20:09,137 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:20:09,294 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 19:20:09,345 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:20:09,348 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:20:09,349 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 20 [2019-09-03 19:20:09,349 INFO L454 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-09-03 19:20:09,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-09-03 19:20:09,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2019-09-03 19:20:09,350 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 20 states. [2019-09-03 19:20:09,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:20:09,579 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2019-09-03 19:20:09,579 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-09-03 19:20:09,580 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 20 [2019-09-03 19:20:09,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:20:09,581 INFO L225 Difference]: With dead ends: 27 [2019-09-03 19:20:09,581 INFO L226 Difference]: Without dead ends: 22 [2019-09-03 19:20:09,582 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 8 SyntacticMatches, 9 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=65, Invalid=397, Unknown=0, NotChecked=0, Total=462 [2019-09-03 19:20:09,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-09-03 19:20:09,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-09-03 19:20:09,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-09-03 19:20:09,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2019-09-03 19:20:09,587 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2019-09-03 19:20:09,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:20:09,587 INFO L475 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2019-09-03 19:20:09,587 INFO L476 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-09-03 19:20:09,587 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2019-09-03 19:20:09,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-09-03 19:20:09,588 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:20:09,588 INFO L399 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:20:09,588 INFO L418 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:20:09,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:20:09,589 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 10 times [2019-09-03 19:20:09,589 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:20:09,589 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:20:09,590 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:20:09,590 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:20:09,590 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:20:09,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:20:10,090 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:20:10,090 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:20:10,090 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:20:10,100 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-03 19:20:10,302 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 19:20:10,302 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:20:10,303 WARN L254 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 56 conjunts are in the unsatisfiable core [2019-09-03 19:20:10,305 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:20:10,706 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 19:20:10,758 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (11)] Exception during sending of exit command (exit): Broken pipe [2019-09-03 19:20:10,763 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:20:10,763 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 31 [2019-09-03 19:20:10,763 INFO L454 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-09-03 19:20:10,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-09-03 19:20:10,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=834, Unknown=0, NotChecked=0, Total=930 [2019-09-03 19:20:10,765 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 31 states. [2019-09-03 19:20:11,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:20:11,073 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2019-09-03 19:20:11,075 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-09-03 19:20:11,075 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 21 [2019-09-03 19:20:11,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:20:11,076 INFO L225 Difference]: With dead ends: 28 [2019-09-03 19:20:11,076 INFO L226 Difference]: Without dead ends: 23 [2019-09-03 19:20:11,077 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=108, Invalid=948, Unknown=0, NotChecked=0, Total=1056 [2019-09-03 19:20:11,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-09-03 19:20:11,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2019-09-03 19:20:11,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-09-03 19:20:11,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2019-09-03 19:20:11,081 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2019-09-03 19:20:11,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:20:11,082 INFO L475 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2019-09-03 19:20:11,082 INFO L476 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-09-03 19:20:11,082 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2019-09-03 19:20:11,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-09-03 19:20:11,083 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:20:11,083 INFO L399 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:20:11,083 INFO L418 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:20:11,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:20:11,084 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 11 times [2019-09-03 19:20:11,084 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:20:11,084 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:20:11,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:20:11,085 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:20:11,085 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:20:11,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:20:11,582 WARN L188 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 36 [2019-09-03 19:20:11,692 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:20:11,692 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:20:11,692 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:20:11,703 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-09-03 19:20:47,589 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2019-09-03 19:20:47,589 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:20:47,621 WARN L254 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 60 conjunts are in the unsatisfiable core [2019-09-03 19:20:47,623 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:20:48,087 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 19:20:48,180 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:20:48,185 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:20:48,185 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 33 [2019-09-03 19:20:48,185 INFO L454 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-09-03 19:20:48,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-09-03 19:20:48,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=953, Unknown=0, NotChecked=0, Total=1056 [2019-09-03 19:20:48,186 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 33 states. [2019-09-03 19:20:48,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:20:48,534 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2019-09-03 19:20:48,539 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-09-03 19:20:48,539 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 22 [2019-09-03 19:20:48,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:20:48,540 INFO L225 Difference]: With dead ends: 29 [2019-09-03 19:20:48,540 INFO L226 Difference]: Without dead ends: 24 [2019-09-03 19:20:48,541 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=115, Invalid=1075, Unknown=0, NotChecked=0, Total=1190 [2019-09-03 19:20:48,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-09-03 19:20:48,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-09-03 19:20:48,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-09-03 19:20:48,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2019-09-03 19:20:48,549 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2019-09-03 19:20:48,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:20:48,549 INFO L475 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2019-09-03 19:20:48,549 INFO L476 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-09-03 19:20:48,549 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2019-09-03 19:20:48,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-09-03 19:20:48,550 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:20:48,550 INFO L399 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:20:48,550 INFO L418 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:20:48,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:20:48,550 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 12 times [2019-09-03 19:20:48,550 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:20:48,551 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:20:48,551 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:20:48,551 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:20:48,551 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:20:48,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:20:49,170 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:20:49,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:20:49,171 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:20:49,184 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-03 19:20:52,470 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2019-09-03 19:20:52,471 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:20:52,472 WARN L254 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 63 conjunts are in the unsatisfiable core [2019-09-03 19:20:52,475 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:20:52,701 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 19:20:52,746 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:20:52,750 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:20:52,751 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 23 [2019-09-03 19:20:52,751 INFO L454 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-09-03 19:20:52,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-09-03 19:20:52,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2019-09-03 19:20:52,752 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 23 states. [2019-09-03 19:20:53,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:20:53,066 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2019-09-03 19:20:53,066 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-09-03 19:20:53,066 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 23 [2019-09-03 19:20:53,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:20:53,067 INFO L225 Difference]: With dead ends: 30 [2019-09-03 19:20:53,067 INFO L226 Difference]: Without dead ends: 25 [2019-09-03 19:20:53,068 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 9 SyntacticMatches, 11 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=74, Invalid=526, Unknown=0, NotChecked=0, Total=600 [2019-09-03 19:20:53,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-09-03 19:20:53,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2019-09-03 19:20:53,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-09-03 19:20:53,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2019-09-03 19:20:53,073 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2019-09-03 19:20:53,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:20:53,074 INFO L475 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2019-09-03 19:20:53,074 INFO L476 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-09-03 19:20:53,074 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2019-09-03 19:20:53,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-09-03 19:20:53,075 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:20:53,075 INFO L399 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:20:53,075 INFO L418 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:20:53,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:20:53,076 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 13 times [2019-09-03 19:20:53,076 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:20:53,076 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:20:53,077 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:20:53,077 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:20:53,077 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:20:53,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:20:53,759 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:20:53,759 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:20:53,759 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:20:53,772 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 19:20:53,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:20:53,991 WARN L254 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 68 conjunts are in the unsatisfiable core [2019-09-03 19:20:53,992 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:20:54,570 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 19:20:54,628 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:20:54,635 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:20:54,635 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 37 [2019-09-03 19:20:54,636 INFO L454 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-09-03 19:20:54,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-09-03 19:20:54,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1215, Unknown=0, NotChecked=0, Total=1332 [2019-09-03 19:20:54,637 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 37 states. [2019-09-03 19:20:55,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:20:55,050 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2019-09-03 19:20:55,050 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-09-03 19:20:55,050 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 24 [2019-09-03 19:20:55,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:20:55,051 INFO L225 Difference]: With dead ends: 31 [2019-09-03 19:20:55,051 INFO L226 Difference]: Without dead ends: 26 [2019-09-03 19:20:55,053 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 205 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=129, Invalid=1353, Unknown=0, NotChecked=0, Total=1482 [2019-09-03 19:20:55,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-09-03 19:20:55,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-09-03 19:20:55,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-09-03 19:20:55,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2019-09-03 19:20:55,058 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2019-09-03 19:20:55,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:20:55,059 INFO L475 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2019-09-03 19:20:55,059 INFO L476 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-09-03 19:20:55,059 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2019-09-03 19:20:55,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-09-03 19:20:55,060 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:20:55,060 INFO L399 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:20:55,060 INFO L418 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:20:55,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:20:55,061 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 14 times [2019-09-03 19:20:55,061 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:20:55,061 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:20:55,061 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:20:55,062 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 19:20:55,062 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:20:55,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:20:55,784 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:20:55,784 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:20:55,784 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:20:55,795 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-03 19:20:55,895 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-03 19:20:55,895 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:20:55,897 WARN L254 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 71 conjunts are in the unsatisfiable core [2019-09-03 19:20:55,898 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:20:56,178 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 19:20:56,236 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:20:56,239 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:20:56,239 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 25 [2019-09-03 19:20:56,240 INFO L454 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-09-03 19:20:56,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-09-03 19:20:56,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2019-09-03 19:20:56,241 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 25 states. [2019-09-03 19:20:56,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:20:56,616 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2019-09-03 19:20:56,617 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-09-03 19:20:56,617 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 25 [2019-09-03 19:20:56,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:20:56,618 INFO L225 Difference]: With dead ends: 32 [2019-09-03 19:20:56,618 INFO L226 Difference]: Without dead ends: 27 [2019-09-03 19:20:56,618 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 9 SyntacticMatches, 13 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=80, Invalid=622, Unknown=0, NotChecked=0, Total=702 [2019-09-03 19:20:56,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-09-03 19:20:56,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2019-09-03 19:20:56,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-09-03 19:20:56,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2019-09-03 19:20:56,623 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2019-09-03 19:20:56,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:20:56,623 INFO L475 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2019-09-03 19:20:56,624 INFO L476 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-09-03 19:20:56,624 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2019-09-03 19:20:56,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-09-03 19:20:56,624 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:20:56,625 INFO L399 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:20:56,625 INFO L418 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:20:56,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:20:56,625 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 15 times [2019-09-03 19:20:56,625 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:20:56,625 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:20:56,626 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:20:56,626 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:20:56,626 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:20:56,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:20:57,398 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:20:57,398 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:20:57,398 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:20:57,410 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-03 19:20:57,601 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-09-03 19:20:57,601 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:20:57,603 WARN L254 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 77 conjunts are in the unsatisfiable core [2019-09-03 19:20:57,604 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:20:57,826 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 19:20:57,872 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:20:57,875 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:20:57,876 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 26 [2019-09-03 19:20:57,876 INFO L454 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-09-03 19:20:57,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-09-03 19:20:57,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2019-09-03 19:20:57,876 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 26 states. [2019-09-03 19:20:58,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:20:58,310 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2019-09-03 19:20:58,310 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-09-03 19:20:58,311 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 26 [2019-09-03 19:20:58,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:20:58,312 INFO L225 Difference]: With dead ends: 33 [2019-09-03 19:20:58,312 INFO L226 Difference]: Without dead ends: 28 [2019-09-03 19:20:58,313 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 10 SyntacticMatches, 13 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=83, Invalid=673, Unknown=0, NotChecked=0, Total=756 [2019-09-03 19:20:58,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-09-03 19:20:58,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-09-03 19:20:58,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-09-03 19:20:58,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2019-09-03 19:20:58,319 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2019-09-03 19:20:58,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:20:58,319 INFO L475 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2019-09-03 19:20:58,320 INFO L476 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-09-03 19:20:58,320 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2019-09-03 19:20:58,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-09-03 19:20:58,321 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:20:58,321 INFO L399 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:20:58,321 INFO L418 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:20:58,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:20:58,321 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 16 times [2019-09-03 19:20:58,322 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:20:58,322 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:20:58,323 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:20:58,323 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:20:58,323 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:20:58,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:20:59,080 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:20:59,080 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:20:59,080 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:20:59,091 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-03 19:20:59,271 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 19:20:59,271 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:20:59,272 WARN L254 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 79 conjunts are in the unsatisfiable core [2019-09-03 19:20:59,274 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:20:59,481 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 19:20:59,529 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:20:59,533 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:20:59,533 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 27 [2019-09-03 19:20:59,533 INFO L454 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-09-03 19:20:59,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-09-03 19:20:59,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2019-09-03 19:20:59,534 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 27 states. [2019-09-03 19:20:59,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:20:59,987 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2019-09-03 19:20:59,988 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-09-03 19:20:59,988 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 27 [2019-09-03 19:20:59,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:20:59,989 INFO L225 Difference]: With dead ends: 34 [2019-09-03 19:20:59,989 INFO L226 Difference]: Without dead ends: 29 [2019-09-03 19:20:59,990 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 11 SyntacticMatches, 13 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=86, Invalid=726, Unknown=0, NotChecked=0, Total=812 [2019-09-03 19:20:59,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-09-03 19:20:59,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2019-09-03 19:20:59,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-09-03 19:20:59,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2019-09-03 19:20:59,996 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2019-09-03 19:20:59,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:20:59,996 INFO L475 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2019-09-03 19:20:59,996 INFO L476 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-09-03 19:20:59,996 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2019-09-03 19:20:59,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-09-03 19:20:59,997 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:20:59,997 INFO L399 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:20:59,997 INFO L418 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:20:59,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:20:59,998 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 17 times [2019-09-03 19:20:59,998 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:20:59,998 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:20:59,999 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:20:59,999 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:20:59,999 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:21:00,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:21:00,773 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:21:00,774 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:21:00,774 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:21:00,785 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-09-03 19:22:29,365 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2019-09-03 19:22:29,365 INFO L250 tOrderPrioritization]: Conjunction of SSA is unknown [2019-09-03 19:22:30,397 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-09-03 19:22:30,398 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2019-09-03 19:22:30,398 INFO L454 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-09-03 19:22:30,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-09-03 19:22:30,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=488, Unknown=0, NotChecked=0, Total=552 [2019-09-03 19:22:30,399 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 24 states. [2019-09-03 19:22:30,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:22:30,852 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2019-09-03 19:22:30,852 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-09-03 19:22:30,852 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 28 [2019-09-03 19:22:30,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:22:30,853 INFO L225 Difference]: With dead ends: 35 [2019-09-03 19:22:30,853 INFO L226 Difference]: Without dead ends: 30 [2019-09-03 19:22:30,853 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2019-09-03 19:22:30,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-09-03 19:22:30,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2019-09-03 19:22:30,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-09-03 19:22:30,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2019-09-03 19:22:30,863 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2019-09-03 19:22:30,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:22:30,864 INFO L475 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2019-09-03 19:22:30,864 INFO L476 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-09-03 19:22:30,864 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2019-09-03 19:22:30,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-09-03 19:22:30,866 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:22:30,866 INFO L399 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:22:30,866 INFO L418 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:22:30,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:22:30,866 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 18 times [2019-09-03 19:22:30,866 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:22:30,867 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:22:30,867 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:22:30,867 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:22:30,867 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:22:30,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:22:31,777 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:22:31,778 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:22:31,778 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:22:31,788 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-03 19:23:27,802 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2019-09-03 19:23:27,802 INFO L250 tOrderPrioritization]: Conjunction of SSA is unknown [2019-09-03 19:23:34,694 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-09-03 19:23:34,695 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2019-09-03 19:23:34,695 INFO L454 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-09-03 19:23:34,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-09-03 19:23:34,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=533, Unknown=0, NotChecked=0, Total=600 [2019-09-03 19:23:34,696 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 25 states. [2019-09-03 19:23:35,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:23:35,159 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2019-09-03 19:23:35,159 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-09-03 19:23:35,160 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 29 [2019-09-03 19:23:35,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:23:35,161 INFO L225 Difference]: With dead ends: 36 [2019-09-03 19:23:35,161 INFO L226 Difference]: Without dead ends: 31 [2019-09-03 19:23:35,161 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2019-09-03 19:23:35,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-09-03 19:23:35,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2019-09-03 19:23:35,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-09-03 19:23:35,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2019-09-03 19:23:35,167 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2019-09-03 19:23:35,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:23:35,167 INFO L475 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2019-09-03 19:23:35,167 INFO L476 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-09-03 19:23:35,168 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2019-09-03 19:23:35,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-09-03 19:23:35,168 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:23:35,168 INFO L399 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:23:35,169 INFO L418 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:23:35,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:23:35,169 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 19 times [2019-09-03 19:23:35,169 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:23:35,169 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:23:35,170 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:23:35,170 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:23:35,170 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:23:35,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:23:36,037 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:23:36,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:23:36,037 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:23:36,049 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 19:23:36,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:23:36,097 WARN L254 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 92 conjunts are in the unsatisfiable core [2019-09-03 19:23:36,099 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:23:37,148 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 19:23:37,226 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:23:37,229 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:23:37,229 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 49 [2019-09-03 19:23:37,230 INFO L454 AbstractCegarLoop]: Interpolant automaton has 49 states [2019-09-03 19:23:37,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2019-09-03 19:23:37,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=2193, Unknown=0, NotChecked=0, Total=2352 [2019-09-03 19:23:37,232 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 49 states. [2019-09-03 19:23:37,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:23:37,968 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2019-09-03 19:23:37,968 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-09-03 19:23:37,968 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 30 [2019-09-03 19:23:37,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:23:37,969 INFO L225 Difference]: With dead ends: 37 [2019-09-03 19:23:37,969 INFO L226 Difference]: Without dead ends: 32 [2019-09-03 19:23:37,971 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=171, Invalid=2379, Unknown=0, NotChecked=0, Total=2550 [2019-09-03 19:23:37,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-09-03 19:23:37,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2019-09-03 19:23:37,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-09-03 19:23:37,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2019-09-03 19:23:37,982 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2019-09-03 19:23:37,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:23:37,983 INFO L475 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2019-09-03 19:23:37,983 INFO L476 AbstractCegarLoop]: Interpolant automaton has 49 states. [2019-09-03 19:23:37,983 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2019-09-03 19:23:37,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-09-03 19:23:37,984 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:23:37,984 INFO L399 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:23:37,984 INFO L418 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:23:37,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:23:37,988 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 20 times [2019-09-03 19:23:37,988 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:23:37,988 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:23:37,988 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:23:37,989 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 19:23:37,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:23:38,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:23:38,957 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:23:38,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:23:38,958 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:23:38,968 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-03 19:23:40,690 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-03 19:23:40,690 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:23:40,692 WARN L254 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 95 conjunts are in the unsatisfiable core [2019-09-03 19:23:40,694 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:23:40,937 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 19:23:40,995 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:23:41,000 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:23:41,000 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 31 [2019-09-03 19:23:41,000 INFO L454 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-09-03 19:23:41,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-09-03 19:23:41,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2019-09-03 19:23:41,001 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 31 states. [2019-09-03 19:23:41,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:23:41,608 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2019-09-03 19:23:41,608 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-09-03 19:23:41,608 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 31 [2019-09-03 19:23:41,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:23:41,609 INFO L225 Difference]: With dead ends: 38 [2019-09-03 19:23:41,609 INFO L226 Difference]: Without dead ends: 33 [2019-09-03 19:23:41,610 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 13 SyntacticMatches, 15 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=98, Invalid=958, Unknown=0, NotChecked=0, Total=1056 [2019-09-03 19:23:41,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-09-03 19:23:41,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2019-09-03 19:23:41,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-09-03 19:23:41,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2019-09-03 19:23:41,616 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2019-09-03 19:23:41,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:23:41,616 INFO L475 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2019-09-03 19:23:41,616 INFO L476 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-09-03 19:23:41,616 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2019-09-03 19:23:41,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-09-03 19:23:41,616 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:23:41,617 INFO L399 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:23:41,617 INFO L418 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:23:41,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:23:41,617 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 21 times [2019-09-03 19:23:41,617 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:23:41,617 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:23:41,618 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:23:41,618 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:23:41,618 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:23:41,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:23:42,660 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:23:42,660 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:23:42,661 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:23:42,676 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-03 19:23:52,505 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2019-09-03 19:23:52,505 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:23:52,702 WARN L254 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 100 conjunts are in the unsatisfiable core [2019-09-03 19:23:52,704 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:23:53,842 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 19:23:53,929 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (22)] Exception during sending of exit command (exit): Broken pipe [2019-09-03 19:23:53,935 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:23:53,935 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 53 [2019-09-03 19:23:53,935 INFO L454 AbstractCegarLoop]: Interpolant automaton has 53 states [2019-09-03 19:23:53,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2019-09-03 19:23:53,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=2583, Unknown=0, NotChecked=0, Total=2756 [2019-09-03 19:23:53,936 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 53 states. [2019-09-03 19:23:55,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:23:55,081 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2019-09-03 19:23:55,081 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-09-03 19:23:55,082 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 32 [2019-09-03 19:23:55,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:23:55,082 INFO L225 Difference]: With dead ends: 39 [2019-09-03 19:23:55,082 INFO L226 Difference]: Without dead ends: 34 [2019-09-03 19:23:55,084 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 401 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=185, Invalid=2785, Unknown=0, NotChecked=0, Total=2970 [2019-09-03 19:23:55,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-09-03 19:23:55,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2019-09-03 19:23:55,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-09-03 19:23:55,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2019-09-03 19:23:55,089 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2019-09-03 19:23:55,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:23:55,090 INFO L475 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2019-09-03 19:23:55,090 INFO L476 AbstractCegarLoop]: Interpolant automaton has 53 states. [2019-09-03 19:23:55,090 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2019-09-03 19:23:55,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-09-03 19:23:55,090 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:23:55,090 INFO L399 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:23:55,091 INFO L418 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:23:55,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:23:55,091 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 22 times [2019-09-03 19:23:55,091 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:23:55,091 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:23:55,092 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:23:55,092 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:23:55,092 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:23:55,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:23:56,209 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:23:56,210 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:23:56,210 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:23:56,219 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-03 19:24:08,244 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 19:24:08,244 INFO L250 tOrderPrioritization]: Conjunction of SSA is unknown [2019-09-03 19:24:08,359 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-09-03 19:24:08,360 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2019-09-03 19:24:08,360 INFO L454 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-09-03 19:24:08,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-09-03 19:24:08,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=733, Unknown=0, NotChecked=0, Total=812 [2019-09-03 19:24:08,361 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 29 states. [2019-09-03 19:24:08,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:24:08,980 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2019-09-03 19:24:08,981 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-09-03 19:24:08,981 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 33 [2019-09-03 19:24:08,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:24:08,982 INFO L225 Difference]: With dead ends: 40 [2019-09-03 19:24:08,982 INFO L226 Difference]: Without dead ends: 35 [2019-09-03 19:24:08,983 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2019-09-03 19:24:08,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-09-03 19:24:08,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2019-09-03 19:24:08,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-09-03 19:24:08,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2019-09-03 19:24:08,988 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2019-09-03 19:24:08,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:24:08,989 INFO L475 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2019-09-03 19:24:08,989 INFO L476 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-09-03 19:24:08,989 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2019-09-03 19:24:08,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-09-03 19:24:08,989 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:24:08,990 INFO L399 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:24:08,990 INFO L418 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:24:08,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:24:08,990 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 23 times [2019-09-03 19:24:08,990 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:24:08,990 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:24:08,991 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:24:08,991 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:24:08,991 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:24:09,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:24:10,184 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:24:10,184 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:24:10,184 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:24:10,201 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-09-03 19:26:14,722 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2019-09-03 19:26:14,722 INFO L250 tOrderPrioritization]: Conjunction of SSA is unknown [2019-09-03 19:26:17,083 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-09-03 19:26:17,083 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2019-09-03 19:26:17,083 INFO L454 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-09-03 19:26:17,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-09-03 19:26:17,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=788, Unknown=0, NotChecked=0, Total=870 [2019-09-03 19:26:17,084 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 30 states. [2019-09-03 19:26:17,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:26:17,756 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2019-09-03 19:26:17,757 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-09-03 19:26:17,757 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 34 [2019-09-03 19:26:17,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:26:17,758 INFO L225 Difference]: With dead ends: 41 [2019-09-03 19:26:17,758 INFO L226 Difference]: Without dead ends: 36 [2019-09-03 19:26:17,758 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2019-09-03 19:26:17,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-09-03 19:26:17,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2019-09-03 19:26:17,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-09-03 19:26:17,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2019-09-03 19:26:17,764 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2019-09-03 19:26:17,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:26:17,764 INFO L475 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2019-09-03 19:26:17,764 INFO L476 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-09-03 19:26:17,764 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2019-09-03 19:26:17,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-09-03 19:26:17,765 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:26:17,765 INFO L399 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:26:17,765 INFO L418 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:26:17,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:26:17,765 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 24 times [2019-09-03 19:26:17,765 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:26:17,766 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:26:17,766 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:26:17,766 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:26:17,766 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:26:17,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:26:18,863 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:26:18,863 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:26:18,863 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:26:18,874 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-03 19:26:55,914 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 14 check-sat command(s) [2019-09-03 19:26:55,915 INFO L250 tOrderPrioritization]: Conjunction of SSA is unknown [2019-09-03 19:26:57,552 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-09-03 19:26:57,553 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2019-09-03 19:26:57,553 INFO L454 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-09-03 19:26:57,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-09-03 19:26:57,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=845, Unknown=0, NotChecked=0, Total=930 [2019-09-03 19:26:57,553 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 31 states. [2019-09-03 19:26:58,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:26:58,257 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2019-09-03 19:26:58,262 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-09-03 19:26:58,262 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 35 [2019-09-03 19:26:58,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:26:58,263 INFO L225 Difference]: With dead ends: 42 [2019-09-03 19:26:58,263 INFO L226 Difference]: Without dead ends: 37 [2019-09-03 19:26:58,264 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2019-09-03 19:26:58,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-09-03 19:26:58,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2019-09-03 19:26:58,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-09-03 19:26:58,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2019-09-03 19:26:58,273 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2019-09-03 19:26:58,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:26:58,273 INFO L475 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2019-09-03 19:26:58,274 INFO L476 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-09-03 19:26:58,274 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2019-09-03 19:26:58,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-09-03 19:26:58,274 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:26:58,274 INFO L399 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:26:58,275 INFO L418 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:26:58,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:26:58,275 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 25 times [2019-09-03 19:26:58,275 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:26:58,275 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:26:58,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:26:58,276 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:26:58,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:26:58,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:26:59,441 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:26:59,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:26:59,441 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:26:59,452 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 19:27:11,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2019-09-03 19:27:11,530 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-09-03 19:27:11,531 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2019-09-03 19:27:11,531 INFO L454 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-09-03 19:27:11,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-09-03 19:27:11,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=904, Unknown=0, NotChecked=0, Total=992 [2019-09-03 19:27:11,532 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 32 states. [2019-09-03 19:27:12,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:27:12,283 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2019-09-03 19:27:12,283 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-09-03 19:27:12,284 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 36 [2019-09-03 19:27:12,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:27:12,284 INFO L225 Difference]: With dead ends: 43 [2019-09-03 19:27:12,284 INFO L226 Difference]: Without dead ends: 38 [2019-09-03 19:27:12,285 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2019-09-03 19:27:12,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-09-03 19:27:12,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2019-09-03 19:27:12,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-09-03 19:27:12,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2019-09-03 19:27:12,291 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2019-09-03 19:27:12,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:27:12,291 INFO L475 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2019-09-03 19:27:12,291 INFO L476 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-09-03 19:27:12,291 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2019-09-03 19:27:12,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-09-03 19:27:12,292 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:27:12,292 INFO L399 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:27:12,292 INFO L418 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:27:12,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:27:12,292 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 26 times [2019-09-03 19:27:12,292 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:27:12,293 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:27:12,293 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:27:12,293 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 19:27:12,293 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:27:12,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:27:13,528 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:27:13,529 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:27:13,529 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:27:13,542 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-03 19:27:25,575 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-03 19:27:25,575 INFO L250 tOrderPrioritization]: Conjunction of SSA is unknown [2019-09-03 19:27:25,819 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-09-03 19:27:25,819 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2019-09-03 19:27:25,819 INFO L454 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-09-03 19:27:25,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-09-03 19:27:25,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=965, Unknown=0, NotChecked=0, Total=1056 [2019-09-03 19:27:25,820 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 33 states. [2019-09-03 19:27:26,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:27:26,625 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2019-09-03 19:27:26,625 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-09-03 19:27:26,626 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 37 [2019-09-03 19:27:26,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:27:26,626 INFO L225 Difference]: With dead ends: 44 [2019-09-03 19:27:26,626 INFO L226 Difference]: Without dead ends: 39 [2019-09-03 19:27:26,627 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2019-09-03 19:27:26,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-09-03 19:27:26,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2019-09-03 19:27:26,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-09-03 19:27:26,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2019-09-03 19:27:26,634 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2019-09-03 19:27:26,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:27:26,634 INFO L475 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2019-09-03 19:27:26,634 INFO L476 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-09-03 19:27:26,634 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2019-09-03 19:27:26,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-09-03 19:27:26,635 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:27:26,635 INFO L399 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:27:26,635 INFO L418 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:27:26,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:27:26,635 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 27 times [2019-09-03 19:27:26,635 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:27:26,636 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:27:26,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:27:26,636 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:27:26,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:27:26,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:27:27,952 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:27:27,952 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:27:27,952 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:27:27,966 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-03 19:29:45,231 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2019-09-03 19:29:45,231 INFO L250 tOrderPrioritization]: Conjunction of SSA is unknown [2019-09-03 19:29:48,836 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-09-03 19:29:48,836 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2019-09-03 19:29:48,836 INFO L454 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-09-03 19:29:48,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-09-03 19:29:48,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=1028, Unknown=0, NotChecked=0, Total=1122 [2019-09-03 19:29:48,837 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 34 states. [2019-09-03 19:29:49,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:29:49,705 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2019-09-03 19:29:49,706 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-09-03 19:29:49,706 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 38 [2019-09-03 19:29:49,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:29:49,707 INFO L225 Difference]: With dead ends: 45 [2019-09-03 19:29:49,707 INFO L226 Difference]: Without dead ends: 40 [2019-09-03 19:29:49,708 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2019-09-03 19:29:49,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-09-03 19:29:49,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2019-09-03 19:29:49,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-09-03 19:29:49,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2019-09-03 19:29:49,714 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2019-09-03 19:29:49,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:29:49,714 INFO L475 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2019-09-03 19:29:49,714 INFO L476 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-09-03 19:29:49,714 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2019-09-03 19:29:49,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-09-03 19:29:49,715 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:29:49,715 INFO L399 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:29:49,715 INFO L418 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:29:49,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:29:49,715 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 28 times [2019-09-03 19:29:49,715 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:29:49,716 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:29:49,716 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:29:49,716 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:29:49,716 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:29:49,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:29:51,029 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:29:51,030 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:29:51,030 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:29:51,040 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-03 19:29:59,458 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 19:29:59,458 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:29:59,461 WARN L254 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 132 conjunts are in the unsatisfiable core [2019-09-03 19:29:59,463 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:30:04,495 WARN L188 SmtUtils]: Spent 2.26 s on a formula simplification that was a NOOP. DAG size: 21 [2019-09-03 19:30:12,460 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 19:30:12,605 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:30:12,610 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:30:12,610 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 67 [2019-09-03 19:30:12,611 INFO L454 AbstractCegarLoop]: Interpolant automaton has 67 states [2019-09-03 19:30:12,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2019-09-03 19:30:12,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=4198, Unknown=2, NotChecked=0, Total=4422 [2019-09-03 19:30:12,612 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 67 states. [2019-09-03 19:30:23,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:30:23,581 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2019-09-03 19:30:23,581 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-09-03 19:30:23,581 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 39 [2019-09-03 19:30:23,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:30:23,582 INFO L225 Difference]: With dead ends: 46 [2019-09-03 19:30:23,583 INFO L226 Difference]: Without dead ends: 41 [2019-09-03 19:30:23,585 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 621 ImplicationChecksByTransitivity, 21.4s TimeCoverageRelationStatistics Valid=234, Invalid=4454, Unknown=4, NotChecked=0, Total=4692 [2019-09-03 19:30:23,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-09-03 19:30:23,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2019-09-03 19:30:23,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-09-03 19:30:23,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2019-09-03 19:30:23,591 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2019-09-03 19:30:23,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:30:23,591 INFO L475 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2019-09-03 19:30:23,591 INFO L476 AbstractCegarLoop]: Interpolant automaton has 67 states. [2019-09-03 19:30:23,592 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2019-09-03 19:30:23,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-09-03 19:30:23,592 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:30:23,592 INFO L399 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:30:23,593 INFO L418 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:30:23,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:30:23,593 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 29 times [2019-09-03 19:30:23,593 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:30:23,593 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:30:23,594 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:30:23,594 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:30:23,594 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:30:23,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:30:24,972 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:30:24,972 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:30:24,972 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-03 19:30:24,991 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:33:22,738 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 16 check-sat command(s) [2019-09-03 19:33:22,738 INFO L250 tOrderPrioritization]: Conjunction of SSA is unknown [2019-09-03 19:33:56,415 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-09-03 19:33:56,415 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2019-09-03 19:33:56,415 INFO L454 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-09-03 19:33:56,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-09-03 19:33:56,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=1160, Unknown=0, NotChecked=0, Total=1260 [2019-09-03 19:33:56,416 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 36 states. [2019-09-03 19:33:57,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:33:57,442 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2019-09-03 19:33:57,442 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-09-03 19:33:57,443 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 40 [2019-09-03 19:33:57,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:33:57,444 INFO L225 Difference]: With dead ends: 47 [2019-09-03 19:33:57,444 INFO L226 Difference]: Without dead ends: 42 [2019-09-03 19:33:57,445 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2019-09-03 19:33:57,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-09-03 19:33:57,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2019-09-03 19:33:57,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-09-03 19:33:57,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2019-09-03 19:33:57,451 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2019-09-03 19:33:57,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:33:57,452 INFO L475 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2019-09-03 19:33:57,452 INFO L476 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-09-03 19:33:57,452 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2019-09-03 19:33:57,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2019-09-03 19:33:57,452 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:33:57,453 INFO L399 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:33:57,453 INFO L418 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:33:57,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:33:57,453 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 30 times [2019-09-03 19:33:57,453 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:33:57,454 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:33:57,454 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:33:57,454 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:33:57,454 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:33:57,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:33:58,946 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:33:58,946 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:33:58,946 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:33:58,957 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE