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/array-examples/standard_init3_ground-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 21:44:32,317 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 21:44:32,320 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 21:44:32,339 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 21:44:32,339 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 21:44:32,341 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 21:44:32,342 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 21:44:32,344 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 21:44:32,345 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 21:44:32,346 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 21:44:32,347 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 21:44:32,348 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 21:44:32,349 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 21:44:32,350 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 21:44:32,350 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 21:44:32,352 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 21:44:32,352 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 21:44:32,353 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 21:44:32,355 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 21:44:32,358 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 21:44:32,362 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 21:44:32,364 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 21:44:32,365 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 21:44:32,368 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 21:44:32,370 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 21:44:32,373 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 21:44:32,374 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 21:44:32,375 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 21:44:32,375 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 21:44:32,376 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 21:44:32,377 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 21:44:32,377 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 21:44:32,378 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 21:44:32,378 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 21:44:32,379 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 21:44:32,379 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 21:44:32,383 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 [2019-10-14 21:44:32,400 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 21:44:32,400 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 21:44:32,402 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 21:44:32,402 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 21:44:32,402 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 21:44:32,402 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 21:44:32,402 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 21:44:32,403 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 21:44:32,403 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 21:44:32,403 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 21:44:32,403 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 21:44:32,403 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 21:44:32,404 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 21:44:32,404 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 21:44:32,404 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 21:44:32,404 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 21:44:32,404 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 21:44:32,405 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 21:44:32,405 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 21:44:32,405 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 21:44:32,405 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 21:44:32,405 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:44:32,406 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 21:44:32,406 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 21:44:32,406 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 21:44:32,406 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 21:44:32,406 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 21:44:32,407 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 21:44:32,407 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 21:44:32,706 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 21:44:32,725 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 21:44:32,730 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 21:44:32,731 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 21:44:32,732 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 21:44:32,732 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_init3_ground-1.i [2019-10-14 21:44:32,805 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6ec2304a1/ba241794c93649979c41c15b41f7d651/FLAGb6ab293e5 [2019-10-14 21:44:33,278 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 21:44:33,281 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_init3_ground-1.i [2019-10-14 21:44:33,287 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6ec2304a1/ba241794c93649979c41c15b41f7d651/FLAGb6ab293e5 [2019-10-14 21:44:33,672 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6ec2304a1/ba241794c93649979c41c15b41f7d651 [2019-10-14 21:44:33,682 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 21:44:33,684 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 21:44:33,685 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 21:44:33,685 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 21:44:33,689 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 21:44:33,690 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:44:33" (1/1) ... [2019-10-14 21:44:33,692 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5b574a9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:33, skipping insertion in model container [2019-10-14 21:44:33,692 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:44:33" (1/1) ... [2019-10-14 21:44:33,699 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 21:44:33,715 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 21:44:33,896 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:44:33,901 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 21:44:33,921 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:44:33,938 INFO L192 MainTranslator]: Completed translation [2019-10-14 21:44:33,939 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:33 WrapperNode [2019-10-14 21:44:33,939 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 21:44:33,939 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 21:44:33,940 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 21:44:33,940 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 21:44:34,032 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:33" (1/1) ... [2019-10-14 21:44:34,032 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:33" (1/1) ... [2019-10-14 21:44:34,041 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:33" (1/1) ... [2019-10-14 21:44:34,043 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:33" (1/1) ... [2019-10-14 21:44:34,050 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:33" (1/1) ... [2019-10-14 21:44:34,058 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:33" (1/1) ... [2019-10-14 21:44:34,060 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:33" (1/1) ... [2019-10-14 21:44:34,062 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 21:44:34,063 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 21:44:34,063 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 21:44:34,063 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 21:44:34,064 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:33" (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 [2019-10-14 21:44:34,124 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 21:44:34,124 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 21:44:34,124 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 21:44:34,124 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 21:44:34,124 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 21:44:34,124 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 21:44:34,125 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 21:44:34,125 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-14 21:44:34,125 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-14 21:44:34,125 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-14 21:44:34,125 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-14 21:44:34,125 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 21:44:34,126 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 21:44:34,349 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 21:44:34,354 INFO L284 CfgBuilder]: Removed 4 assume(true) statements. [2019-10-14 21:44:34,356 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:44:34 BoogieIcfgContainer [2019-10-14 21:44:34,357 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 21:44:34,360 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 21:44:34,360 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 21:44:34,363 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 21:44:34,364 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 09:44:33" (1/3) ... [2019-10-14 21:44:34,368 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@60ef1da7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:44:34, skipping insertion in model container [2019-10-14 21:44:34,368 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:33" (2/3) ... [2019-10-14 21:44:34,369 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@60ef1da7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:44:34, skipping insertion in model container [2019-10-14 21:44:34,369 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:44:34" (3/3) ... [2019-10-14 21:44:34,371 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_init3_ground-1.i [2019-10-14 21:44:34,404 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 21:44:34,425 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 21:44:34,444 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 21:44:34,479 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 21:44:34,479 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 21:44:34,480 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 21:44:34,480 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 21:44:34,480 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 21:44:34,480 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 21:44:34,480 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 21:44:34,480 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 21:44:34,495 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2019-10-14 21:44:34,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-14 21:44:34,501 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:34,502 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:34,504 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:34,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:34,508 INFO L82 PathProgramCache]: Analyzing trace with hash 578824766, now seen corresponding path program 1 times [2019-10-14 21:44:34,515 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:34,515 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429426902] [2019-10-14 21:44:34,515 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:34,515 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:34,515 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:34,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:34,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:34,681 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:44:34,684 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429426902] [2019-10-14 21:44:34,685 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:44:34,685 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 21:44:34,686 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492265347] [2019-10-14 21:44:34,691 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 21:44:34,692 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:34,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 21:44:34,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:44:34,713 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 3 states. [2019-10-14 21:44:34,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:34,875 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2019-10-14 21:44:34,876 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 21:44:34,878 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2019-10-14 21:44:34,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:34,886 INFO L225 Difference]: With dead ends: 47 [2019-10-14 21:44:34,887 INFO L226 Difference]: Without dead ends: 22 [2019-10-14 21:44:34,890 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:44:34,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-10-14 21:44:34,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-10-14 21:44:34,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-14 21:44:34,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2019-10-14 21:44:34,931 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 17 [2019-10-14 21:44:34,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:34,931 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2019-10-14 21:44:34,932 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 21:44:34,932 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2019-10-14 21:44:34,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-14 21:44:34,933 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:34,933 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:34,934 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:34,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:34,934 INFO L82 PathProgramCache]: Analyzing trace with hash -823304390, now seen corresponding path program 1 times [2019-10-14 21:44:34,935 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:34,935 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1656128903] [2019-10-14 21:44:34,935 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:34,935 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:34,936 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:34,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:35,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:35,009 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:44:35,009 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1656128903] [2019-10-14 21:44:35,010 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:44:35,010 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:44:35,010 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183453428] [2019-10-14 21:44:35,012 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:44:35,012 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:35,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:44:35,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:44:35,013 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 4 states. [2019-10-14 21:44:35,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:35,105 INFO L93 Difference]: Finished difference Result 40 states and 48 transitions. [2019-10-14 21:44:35,106 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:44:35,106 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 17 [2019-10-14 21:44:35,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:35,107 INFO L225 Difference]: With dead ends: 40 [2019-10-14 21:44:35,108 INFO L226 Difference]: Without dead ends: 25 [2019-10-14 21:44:35,109 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:44:35,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-10-14 21:44:35,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2019-10-14 21:44:35,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-10-14 21:44:35,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2019-10-14 21:44:35,117 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 17 [2019-10-14 21:44:35,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:35,118 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2019-10-14 21:44:35,118 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:44:35,118 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2019-10-14 21:44:35,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-14 21:44:35,119 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:35,120 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:35,120 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:35,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:35,121 INFO L82 PathProgramCache]: Analyzing trace with hash 3753729, now seen corresponding path program 1 times [2019-10-14 21:44:35,121 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:35,121 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1929114851] [2019-10-14 21:44:35,121 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:35,122 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:35,122 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:35,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:35,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:35,236 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:44:35,237 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1929114851] [2019-10-14 21:44:35,237 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1225550381] [2019-10-14 21:44:35,237 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:35,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:35,304 INFO L256 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 21:44:35,317 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:35,348 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:44:35,348 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:35,349 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-10-14 21:44:35,349 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820864824] [2019-10-14 21:44:35,350 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-14 21:44:35,350 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:35,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-14 21:44:35,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:44:35,351 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand 6 states. [2019-10-14 21:44:35,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:35,458 INFO L93 Difference]: Finished difference Result 45 states and 53 transitions. [2019-10-14 21:44:35,458 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-14 21:44:35,459 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2019-10-14 21:44:35,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:35,460 INFO L225 Difference]: With dead ends: 45 [2019-10-14 21:44:35,460 INFO L226 Difference]: Without dead ends: 28 [2019-10-14 21:44:35,461 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:44:35,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-10-14 21:44:35,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-10-14 21:44:35,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-14 21:44:35,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2019-10-14 21:44:35,469 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 20 [2019-10-14 21:44:35,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:35,469 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2019-10-14 21:44:35,470 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-14 21:44:35,470 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2019-10-14 21:44:35,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-14 21:44:35,471 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:35,471 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:35,677 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:35,678 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:35,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:35,679 INFO L82 PathProgramCache]: Analyzing trace with hash -1185149478, now seen corresponding path program 2 times [2019-10-14 21:44:35,679 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:35,680 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1048389193] [2019-10-14 21:44:35,681 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:35,681 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:35,682 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:35,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:35,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:35,762 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-14 21:44:35,762 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1048389193] [2019-10-14 21:44:35,763 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [400878874] [2019-10-14 21:44:35,763 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:35,815 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:44:35,816 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:35,817 INFO L256 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:44:35,820 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:35,858 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-14 21:44:35,859 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:35,859 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-10-14 21:44:35,859 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060264049] [2019-10-14 21:44:35,860 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 21:44:35,860 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:35,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 21:44:35,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:44:35,861 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 7 states. [2019-10-14 21:44:35,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:35,967 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2019-10-14 21:44:35,967 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 21:44:35,967 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2019-10-14 21:44:35,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:35,968 INFO L225 Difference]: With dead ends: 50 [2019-10-14 21:44:35,968 INFO L226 Difference]: Without dead ends: 31 [2019-10-14 21:44:35,971 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:44:35,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-10-14 21:44:35,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2019-10-14 21:44:35,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-10-14 21:44:35,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2019-10-14 21:44:35,981 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 23 [2019-10-14 21:44:35,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:35,983 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2019-10-14 21:44:35,984 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 21:44:35,984 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2019-10-14 21:44:35,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-10-14 21:44:35,986 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:35,986 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:36,187 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:36,189 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:36,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:36,190 INFO L82 PathProgramCache]: Analyzing trace with hash 455820257, now seen corresponding path program 3 times [2019-10-14 21:44:36,190 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:36,190 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1276404479] [2019-10-14 21:44:36,191 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:36,191 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:36,191 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:36,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:36,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:36,299 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-14 21:44:36,299 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1276404479] [2019-10-14 21:44:36,300 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [551243771] [2019-10-14 21:44:36,300 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:36,357 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-14 21:44:36,358 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:36,359 INFO L256 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-14 21:44:36,362 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:36,380 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-14 21:44:36,380 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:36,380 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-10-14 21:44:36,380 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [51870512] [2019-10-14 21:44:36,381 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-14 21:44:36,381 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:36,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-14 21:44:36,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:44:36,382 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand 8 states. [2019-10-14 21:44:36,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:36,470 INFO L93 Difference]: Finished difference Result 55 states and 63 transitions. [2019-10-14 21:44:36,471 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-14 21:44:36,471 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2019-10-14 21:44:36,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:36,472 INFO L225 Difference]: With dead ends: 55 [2019-10-14 21:44:36,472 INFO L226 Difference]: Without dead ends: 34 [2019-10-14 21:44:36,473 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:44:36,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-10-14 21:44:36,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2019-10-14 21:44:36,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-10-14 21:44:36,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2019-10-14 21:44:36,480 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 26 [2019-10-14 21:44:36,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:36,480 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2019-10-14 21:44:36,480 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-14 21:44:36,480 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2019-10-14 21:44:36,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-10-14 21:44:36,481 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:36,481 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:36,686 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:36,686 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:36,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:36,687 INFO L82 PathProgramCache]: Analyzing trace with hash 1002382458, now seen corresponding path program 4 times [2019-10-14 21:44:36,687 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:36,687 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1585219081] [2019-10-14 21:44:36,688 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:36,688 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:36,688 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:36,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:36,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:36,819 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2019-10-14 21:44:36,819 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1585219081] [2019-10-14 21:44:36,819 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [437864730] [2019-10-14 21:44:36,819 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:36,864 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:44:36,865 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:36,866 INFO L256 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 21:44:36,868 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:36,880 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2019-10-14 21:44:36,880 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:36,881 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-10-14 21:44:36,881 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880354770] [2019-10-14 21:44:36,881 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 21:44:36,882 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:36,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 21:44:36,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:44:36,882 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand 9 states. [2019-10-14 21:44:36,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:36,993 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2019-10-14 21:44:36,994 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-14 21:44:36,994 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2019-10-14 21:44:36,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:36,995 INFO L225 Difference]: With dead ends: 60 [2019-10-14 21:44:36,995 INFO L226 Difference]: Without dead ends: 37 [2019-10-14 21:44:36,996 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:44:36,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-10-14 21:44:37,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2019-10-14 21:44:37,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-10-14 21:44:37,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2019-10-14 21:44:37,002 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 29 [2019-10-14 21:44:37,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:37,003 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2019-10-14 21:44:37,003 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 21:44:37,003 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2019-10-14 21:44:37,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-10-14 21:44:37,004 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:37,004 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:37,214 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:37,215 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:37,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:37,215 INFO L82 PathProgramCache]: Analyzing trace with hash -1395779391, now seen corresponding path program 5 times [2019-10-14 21:44:37,215 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:37,216 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [687415458] [2019-10-14 21:44:37,216 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:37,216 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:37,216 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:37,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:37,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:37,352 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-14 21:44:37,352 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [687415458] [2019-10-14 21:44:37,353 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1954677443] [2019-10-14 21:44:37,353 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:37,535 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2019-10-14 21:44:37,535 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:37,537 INFO L256 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 21:44:37,539 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:37,555 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-14 21:44:37,555 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:37,555 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-10-14 21:44:37,556 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983680421] [2019-10-14 21:44:37,556 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-14 21:44:37,556 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:37,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-14 21:44:37,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:44:37,557 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 10 states. [2019-10-14 21:44:37,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:37,672 INFO L93 Difference]: Finished difference Result 65 states and 73 transitions. [2019-10-14 21:44:37,673 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 21:44:37,673 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2019-10-14 21:44:37,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:37,674 INFO L225 Difference]: With dead ends: 65 [2019-10-14 21:44:37,674 INFO L226 Difference]: Without dead ends: 40 [2019-10-14 21:44:37,675 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:44:37,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-10-14 21:44:37,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2019-10-14 21:44:37,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-10-14 21:44:37,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2019-10-14 21:44:37,682 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 32 [2019-10-14 21:44:37,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:37,682 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2019-10-14 21:44:37,682 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-14 21:44:37,682 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2019-10-14 21:44:37,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-10-14 21:44:37,683 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:37,684 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:37,888 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:37,889 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:37,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:37,889 INFO L82 PathProgramCache]: Analyzing trace with hash 1957995290, now seen corresponding path program 6 times [2019-10-14 21:44:37,889 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:37,890 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [479046246] [2019-10-14 21:44:37,890 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:37,890 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:37,890 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:37,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:38,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:38,030 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-10-14 21:44:38,030 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [479046246] [2019-10-14 21:44:38,031 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1181997110] [2019-10-14 21:44:38,031 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:38,134 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2019-10-14 21:44:38,135 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:38,136 INFO L256 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 21:44:38,138 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:38,163 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-10-14 21:44:38,163 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:38,163 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-10-14 21:44:38,164 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186208832] [2019-10-14 21:44:38,164 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 21:44:38,164 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:38,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 21:44:38,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:44:38,168 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand 11 states. [2019-10-14 21:44:38,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:38,259 INFO L93 Difference]: Finished difference Result 70 states and 78 transitions. [2019-10-14 21:44:38,259 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-14 21:44:38,259 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2019-10-14 21:44:38,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:38,260 INFO L225 Difference]: With dead ends: 70 [2019-10-14 21:44:38,261 INFO L226 Difference]: Without dead ends: 43 [2019-10-14 21:44:38,261 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:44:38,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-10-14 21:44:38,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2019-10-14 21:44:38,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-10-14 21:44:38,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2019-10-14 21:44:38,268 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 35 [2019-10-14 21:44:38,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:38,268 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2019-10-14 21:44:38,268 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 21:44:38,268 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2019-10-14 21:44:38,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-10-14 21:44:38,269 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:38,270 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:38,474 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:38,482 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:38,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:38,482 INFO L82 PathProgramCache]: Analyzing trace with hash -1474050655, now seen corresponding path program 7 times [2019-10-14 21:44:38,482 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:38,482 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [9022348] [2019-10-14 21:44:38,482 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:38,482 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:38,483 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:38,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:38,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:38,590 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-10-14 21:44:38,591 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [9022348] [2019-10-14 21:44:38,591 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1146277455] [2019-10-14 21:44:38,591 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:38,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:38,636 INFO L256 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 21:44:38,640 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:38,658 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-10-14 21:44:38,658 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:38,658 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-10-14 21:44:38,658 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882196460] [2019-10-14 21:44:38,659 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-14 21:44:38,659 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:38,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-14 21:44:38,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:44:38,660 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 12 states. [2019-10-14 21:44:38,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:38,782 INFO L93 Difference]: Finished difference Result 75 states and 83 transitions. [2019-10-14 21:44:38,782 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-14 21:44:38,782 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2019-10-14 21:44:38,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:38,783 INFO L225 Difference]: With dead ends: 75 [2019-10-14 21:44:38,783 INFO L226 Difference]: Without dead ends: 46 [2019-10-14 21:44:38,784 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:44:38,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-10-14 21:44:38,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2019-10-14 21:44:38,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-10-14 21:44:38,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2019-10-14 21:44:38,790 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 38 [2019-10-14 21:44:38,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:38,791 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2019-10-14 21:44:38,791 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-14 21:44:38,791 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2019-10-14 21:44:38,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2019-10-14 21:44:38,792 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:38,792 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:39,003 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:39,003 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:39,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:39,004 INFO L82 PathProgramCache]: Analyzing trace with hash 2136639930, now seen corresponding path program 8 times [2019-10-14 21:44:39,004 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:39,005 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1615980172] [2019-10-14 21:44:39,005 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:39,005 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:39,005 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:39,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:39,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:39,129 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2019-10-14 21:44:39,130 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1615980172] [2019-10-14 21:44:39,130 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1160525142] [2019-10-14 21:44:39,130 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:39,190 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:44:39,191 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:39,192 INFO L256 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 21:44:39,194 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:39,216 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2019-10-14 21:44:39,217 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:39,217 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-10-14 21:44:39,217 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [403015279] [2019-10-14 21:44:39,218 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-14 21:44:39,218 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:39,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-14 21:44:39,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:44:39,219 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand 13 states. [2019-10-14 21:44:39,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:39,350 INFO L93 Difference]: Finished difference Result 80 states and 88 transitions. [2019-10-14 21:44:39,350 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 21:44:39,350 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2019-10-14 21:44:39,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:39,351 INFO L225 Difference]: With dead ends: 80 [2019-10-14 21:44:39,351 INFO L226 Difference]: Without dead ends: 49 [2019-10-14 21:44:39,351 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:44:39,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-10-14 21:44:39,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2019-10-14 21:44:39,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-10-14 21:44:39,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2019-10-14 21:44:39,359 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 41 [2019-10-14 21:44:39,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:39,360 INFO L462 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2019-10-14 21:44:39,360 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-14 21:44:39,360 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2019-10-14 21:44:39,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-10-14 21:44:39,361 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:39,361 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:39,564 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:39,565 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:39,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:39,566 INFO L82 PathProgramCache]: Analyzing trace with hash -1548858751, now seen corresponding path program 9 times [2019-10-14 21:44:39,566 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:39,567 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2036631635] [2019-10-14 21:44:39,567 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:39,567 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:39,567 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:39,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:39,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:39,714 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2019-10-14 21:44:39,715 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2036631635] [2019-10-14 21:44:39,715 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1411989653] [2019-10-14 21:44:39,715 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:40,391 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-10-14 21:44:40,392 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:40,393 INFO L256 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-14 21:44:40,395 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:40,426 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 9 proven. 45 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-14 21:44:40,426 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:40,426 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 15 [2019-10-14 21:44:40,427 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2037280670] [2019-10-14 21:44:40,427 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-14 21:44:40,427 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:40,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-14 21:44:40,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:44:40,428 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2019-10-14 21:44:40,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:40,539 INFO L93 Difference]: Finished difference Result 85 states and 93 transitions. [2019-10-14 21:44:40,539 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 21:44:40,539 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2019-10-14 21:44:40,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:40,540 INFO L225 Difference]: With dead ends: 85 [2019-10-14 21:44:40,540 INFO L226 Difference]: Without dead ends: 52 [2019-10-14 21:44:40,541 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:44:40,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-10-14 21:44:40,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2019-10-14 21:44:40,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-10-14 21:44:40,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions. [2019-10-14 21:44:40,547 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 44 [2019-10-14 21:44:40,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:40,548 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 55 transitions. [2019-10-14 21:44:40,548 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-14 21:44:40,548 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions. [2019-10-14 21:44:40,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-10-14 21:44:40,549 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:40,549 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:40,749 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:40,749 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:40,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:40,750 INFO L82 PathProgramCache]: Analyzing trace with hash 1397676122, now seen corresponding path program 10 times [2019-10-14 21:44:40,751 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:40,751 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349983508] [2019-10-14 21:44:40,752 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:40,752 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:40,752 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:40,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:40,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:40,878 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2019-10-14 21:44:40,879 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349983508] [2019-10-14 21:44:40,879 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1582894837] [2019-10-14 21:44:40,879 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:40,924 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:44:40,924 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:40,925 INFO L256 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 21:44:40,927 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:40,946 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2019-10-14 21:44:40,946 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:40,946 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-10-14 21:44:40,946 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284302110] [2019-10-14 21:44:40,947 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-14 21:44:40,947 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:40,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-14 21:44:40,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:44:40,948 INFO L87 Difference]: Start difference. First operand 52 states and 55 transitions. Second operand 15 states. [2019-10-14 21:44:41,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:41,054 INFO L93 Difference]: Finished difference Result 90 states and 98 transitions. [2019-10-14 21:44:41,054 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 21:44:41,055 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2019-10-14 21:44:41,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:41,056 INFO L225 Difference]: With dead ends: 90 [2019-10-14 21:44:41,056 INFO L226 Difference]: Without dead ends: 55 [2019-10-14 21:44:41,057 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:44:41,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-10-14 21:44:41,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2019-10-14 21:44:41,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-10-14 21:44:41,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2019-10-14 21:44:41,064 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 47 [2019-10-14 21:44:41,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:41,064 INFO L462 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2019-10-14 21:44:41,064 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-14 21:44:41,064 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2019-10-14 21:44:41,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-10-14 21:44:41,065 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:41,065 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:41,269 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:41,270 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:41,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:41,271 INFO L82 PathProgramCache]: Analyzing trace with hash -110123167, now seen corresponding path program 11 times [2019-10-14 21:44:41,271 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:41,271 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [742236383] [2019-10-14 21:44:41,272 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:41,272 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:41,272 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:41,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:41,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:41,437 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2019-10-14 21:44:41,437 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [742236383] [2019-10-14 21:44:41,437 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2142495645] [2019-10-14 21:44:41,437 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:44,584 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2019-10-14 21:44:44,585 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:44,592 INFO L256 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-14 21:44:44,594 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:44,618 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2019-10-14 21:44:44,619 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:44,619 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-10-14 21:44:44,619 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915376040] [2019-10-14 21:44:44,619 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-14 21:44:44,620 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:44,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-14 21:44:44,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-14 21:44:44,620 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 16 states. [2019-10-14 21:44:44,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:44,725 INFO L93 Difference]: Finished difference Result 95 states and 103 transitions. [2019-10-14 21:44:44,725 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-14 21:44:44,726 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2019-10-14 21:44:44,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:44,727 INFO L225 Difference]: With dead ends: 95 [2019-10-14 21:44:44,727 INFO L226 Difference]: Without dead ends: 58 [2019-10-14 21:44:44,728 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-14 21:44:44,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-10-14 21:44:44,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2019-10-14 21:44:44,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-10-14 21:44:44,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 61 transitions. [2019-10-14 21:44:44,734 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 61 transitions. Word has length 50 [2019-10-14 21:44:44,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:44,735 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 61 transitions. [2019-10-14 21:44:44,735 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-14 21:44:44,735 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 61 transitions. [2019-10-14 21:44:44,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2019-10-14 21:44:44,736 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:44,736 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:44,942 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:44,943 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:44,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:44,943 INFO L82 PathProgramCache]: Analyzing trace with hash -1531998470, now seen corresponding path program 12 times [2019-10-14 21:44:44,944 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:44,944 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1855758224] [2019-10-14 21:44:44,944 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:44,945 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:44,945 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:44,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:45,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:45,095 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2019-10-14 21:44:45,095 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1855758224] [2019-10-14 21:44:45,096 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [531932982] [2019-10-14 21:44:45,096 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:47,523 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-10-14 21:44:47,523 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:47,531 INFO L256 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-14 21:44:47,533 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:47,593 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 24 proven. 78 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2019-10-14 21:44:47,597 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:47,597 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 18 [2019-10-14 21:44:47,598 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227726781] [2019-10-14 21:44:47,598 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-14 21:44:47,598 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:47,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-14 21:44:47,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:44:47,599 INFO L87 Difference]: Start difference. First operand 58 states and 61 transitions. Second operand 18 states. [2019-10-14 21:44:47,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:47,759 INFO L93 Difference]: Finished difference Result 100 states and 108 transitions. [2019-10-14 21:44:47,759 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-14 21:44:47,760 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 53 [2019-10-14 21:44:47,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:47,761 INFO L225 Difference]: With dead ends: 100 [2019-10-14 21:44:47,761 INFO L226 Difference]: Without dead ends: 61 [2019-10-14 21:44:47,762 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:44:47,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-10-14 21:44:47,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2019-10-14 21:44:47,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-10-14 21:44:47,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2019-10-14 21:44:47,770 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 53 [2019-10-14 21:44:47,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:47,771 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2019-10-14 21:44:47,771 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-14 21:44:47,771 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2019-10-14 21:44:47,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-10-14 21:44:47,772 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:47,772 INFO L380 BasicCegarLoop]: trace histogram [13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:47,979 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:47,980 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:47,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:47,980 INFO L82 PathProgramCache]: Analyzing trace with hash -420881343, now seen corresponding path program 13 times [2019-10-14 21:44:47,981 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:47,981 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1991669970] [2019-10-14 21:44:47,981 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:47,982 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:47,982 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:48,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:48,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:48,206 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2019-10-14 21:44:48,207 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1991669970] [2019-10-14 21:44:48,207 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [994387426] [2019-10-14 21:44:48,207 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:48,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:48,270 INFO L256 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-14 21:44:48,272 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:48,305 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2019-10-14 21:44:48,306 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:48,309 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-10-14 21:44:48,310 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221232962] [2019-10-14 21:44:48,310 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-14 21:44:48,311 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:48,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-14 21:44:48,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:44:48,314 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 18 states. [2019-10-14 21:44:48,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:48,495 INFO L93 Difference]: Finished difference Result 105 states and 113 transitions. [2019-10-14 21:44:48,496 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-14 21:44:48,496 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2019-10-14 21:44:48,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:48,500 INFO L225 Difference]: With dead ends: 105 [2019-10-14 21:44:48,500 INFO L226 Difference]: Without dead ends: 64 [2019-10-14 21:44:48,501 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:44:48,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-10-14 21:44:48,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2019-10-14 21:44:48,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-10-14 21:44:48,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 67 transitions. [2019-10-14 21:44:48,515 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 67 transitions. Word has length 56 [2019-10-14 21:44:48,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:48,516 INFO L462 AbstractCegarLoop]: Abstraction has 64 states and 67 transitions. [2019-10-14 21:44:48,518 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-14 21:44:48,518 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 67 transitions. [2019-10-14 21:44:48,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2019-10-14 21:44:48,520 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:48,520 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:48,728 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:48,729 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:48,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:48,729 INFO L82 PathProgramCache]: Analyzing trace with hash -1004884582, now seen corresponding path program 14 times [2019-10-14 21:44:48,729 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:48,729 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1778722841] [2019-10-14 21:44:48,730 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:48,730 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:48,730 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:48,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:48,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:48,934 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2019-10-14 21:44:48,935 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1778722841] [2019-10-14 21:44:48,935 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [308903783] [2019-10-14 21:44:48,935 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:48,993 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:44:48,994 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:48,995 INFO L256 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-14 21:44:48,997 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:49,023 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2019-10-14 21:44:49,024 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:49,024 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-10-14 21:44:49,024 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460339739] [2019-10-14 21:44:49,025 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-14 21:44:49,025 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:49,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-14 21:44:49,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:44:49,028 INFO L87 Difference]: Start difference. First operand 64 states and 67 transitions. Second operand 19 states. [2019-10-14 21:44:49,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:49,177 INFO L93 Difference]: Finished difference Result 110 states and 118 transitions. [2019-10-14 21:44:49,177 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-14 21:44:49,177 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2019-10-14 21:44:49,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:49,178 INFO L225 Difference]: With dead ends: 110 [2019-10-14 21:44:49,179 INFO L226 Difference]: Without dead ends: 67 [2019-10-14 21:44:49,180 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:44:49,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2019-10-14 21:44:49,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2019-10-14 21:44:49,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2019-10-14 21:44:49,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2019-10-14 21:44:49,185 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 59 [2019-10-14 21:44:49,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:49,186 INFO L462 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2019-10-14 21:44:49,186 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-14 21:44:49,186 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2019-10-14 21:44:49,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2019-10-14 21:44:49,186 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:49,187 INFO L380 BasicCegarLoop]: trace histogram [15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:49,387 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:49,388 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:49,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:49,388 INFO L82 PathProgramCache]: Analyzing trace with hash -1390483167, now seen corresponding path program 15 times [2019-10-14 21:44:49,389 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:49,389 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1142806830] [2019-10-14 21:44:49,389 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:49,389 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:49,390 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:49,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:49,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:49,601 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2019-10-14 21:44:49,601 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1142806830] [2019-10-14 21:44:49,601 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1424538396] [2019-10-14 21:44:49,602 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:54,208 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-10-14 21:44:54,209 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:54,214 INFO L256 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 28 conjunts are in the unsatisfiable core [2019-10-14 21:44:54,216 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:54,249 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2019-10-14 21:44:54,249 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:54,249 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2019-10-14 21:44:54,250 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913950372] [2019-10-14 21:44:54,250 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-14 21:44:54,250 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:54,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-14 21:44:54,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:44:54,251 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 20 states. [2019-10-14 21:44:54,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:54,436 INFO L93 Difference]: Finished difference Result 115 states and 123 transitions. [2019-10-14 21:44:54,436 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-14 21:44:54,436 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2019-10-14 21:44:54,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:54,437 INFO L225 Difference]: With dead ends: 115 [2019-10-14 21:44:54,437 INFO L226 Difference]: Without dead ends: 70 [2019-10-14 21:44:54,438 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:44:54,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-10-14 21:44:54,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2019-10-14 21:44:54,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2019-10-14 21:44:54,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 73 transitions. [2019-10-14 21:44:54,449 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 73 transitions. Word has length 62 [2019-10-14 21:44:54,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:54,452 INFO L462 AbstractCegarLoop]: Abstraction has 70 states and 73 transitions. [2019-10-14 21:44:54,453 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-14 21:44:54,453 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 73 transitions. [2019-10-14 21:44:54,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2019-10-14 21:44:54,453 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:54,454 INFO L380 BasicCegarLoop]: trace histogram [16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:54,654 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:54,654 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:54,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:54,655 INFO L82 PathProgramCache]: Analyzing trace with hash 2125345850, now seen corresponding path program 16 times [2019-10-14 21:44:54,655 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:54,655 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1585845140] [2019-10-14 21:44:54,655 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:54,656 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:54,656 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:54,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:54,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:54,867 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2019-10-14 21:44:54,868 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1585845140] [2019-10-14 21:44:54,868 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [987680555] [2019-10-14 21:44:54,868 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:54,927 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:44:54,927 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:54,929 INFO L256 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-14 21:44:54,930 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:54,957 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2019-10-14 21:44:54,957 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:54,957 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2019-10-14 21:44:54,957 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670067800] [2019-10-14 21:44:54,958 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-14 21:44:54,958 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:54,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-14 21:44:54,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-14 21:44:54,959 INFO L87 Difference]: Start difference. First operand 70 states and 73 transitions. Second operand 21 states. [2019-10-14 21:44:55,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:55,131 INFO L93 Difference]: Finished difference Result 120 states and 128 transitions. [2019-10-14 21:44:55,132 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-14 21:44:55,132 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2019-10-14 21:44:55,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:55,133 INFO L225 Difference]: With dead ends: 120 [2019-10-14 21:44:55,133 INFO L226 Difference]: Without dead ends: 73 [2019-10-14 21:44:55,133 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-14 21:44:55,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2019-10-14 21:44:55,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2019-10-14 21:44:55,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-10-14 21:44:55,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2019-10-14 21:44:55,139 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 65 [2019-10-14 21:44:55,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:55,140 INFO L462 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2019-10-14 21:44:55,140 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-14 21:44:55,140 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2019-10-14 21:44:55,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2019-10-14 21:44:55,141 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:55,141 INFO L380 BasicCegarLoop]: trace histogram [17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:55,344 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:55,345 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:55,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:55,346 INFO L82 PathProgramCache]: Analyzing trace with hash -1332687359, now seen corresponding path program 17 times [2019-10-14 21:44:55,346 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:55,347 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1869417925] [2019-10-14 21:44:55,347 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:55,347 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:55,348 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:55,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:55,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:55,597 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2019-10-14 21:44:55,597 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1869417925] [2019-10-14 21:44:55,598 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [845628526] [2019-10-14 21:44:55,598 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true