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/sorting_bubblesort_2_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 21:42:32,449 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 21:42:32,451 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 21:42:32,466 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 21:42:32,466 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 21:42:32,467 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 21:42:32,468 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 21:42:32,470 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 21:42:32,472 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 21:42:32,473 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 21:42:32,474 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 21:42:32,475 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 21:42:32,475 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 21:42:32,476 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 21:42:32,477 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 21:42:32,478 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 21:42:32,479 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 21:42:32,480 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 21:42:32,482 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 21:42:32,484 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 21:42:32,486 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 21:42:32,490 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 21:42:32,495 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 21:42:32,496 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 21:42:32,499 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 21:42:32,507 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 21:42:32,508 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 21:42:32,509 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 21:42:32,510 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 21:42:32,511 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 21:42:32,511 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 21:42:32,514 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 21:42:32,514 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 21:42:32,515 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 21:42:32,516 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 21:42:32,517 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 21:42:32,518 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 21:42:32,545 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 21:42:32,545 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 21:42:32,549 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 21:42:32,549 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 21:42:32,550 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 21:42:32,550 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 21:42:32,550 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 21:42:32,550 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 21:42:32,550 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 21:42:32,551 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 21:42:32,552 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 21:42:32,552 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 21:42:32,552 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 21:42:32,553 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 21:42:32,553 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 21:42:32,553 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 21:42:32,553 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 21:42:32,554 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 21:42:32,554 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 21:42:32,554 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 21:42:32,554 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 21:42:32,555 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:42:32,556 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 21:42:32,556 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 21:42:32,556 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 21:42:32,556 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 21:42:32,557 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 21:42:32,557 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 21:42:32,557 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 21:42:32,825 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 21:42:32,844 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 21:42:32,847 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 21:42:32,849 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 21:42:32,849 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 21:42:32,850 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/sorting_bubblesort_2_ground.i [2019-10-14 21:42:32,913 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/36e7a4348/fb42060fa2794edfa4ae05f480b9e894/FLAG0bac49252 [2019-10-14 21:42:33,392 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 21:42:33,395 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/sorting_bubblesort_2_ground.i [2019-10-14 21:42:33,402 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/36e7a4348/fb42060fa2794edfa4ae05f480b9e894/FLAG0bac49252 [2019-10-14 21:42:33,789 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/36e7a4348/fb42060fa2794edfa4ae05f480b9e894 [2019-10-14 21:42:33,799 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 21:42:33,801 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 21:42:33,802 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 21:42:33,802 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 21:42:33,806 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 21:42:33,807 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:42:33" (1/1) ... [2019-10-14 21:42:33,810 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@54268d74 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:33, skipping insertion in model container [2019-10-14 21:42:33,810 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:42:33" (1/1) ... [2019-10-14 21:42:33,818 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 21:42:33,836 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 21:42:34,015 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:42:34,019 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 21:42:34,043 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:42:34,062 INFO L192 MainTranslator]: Completed translation [2019-10-14 21:42:34,063 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:34 WrapperNode [2019-10-14 21:42:34,063 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 21:42:34,064 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 21:42:34,064 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 21:42:34,064 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 21:42:34,155 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:34" (1/1) ... [2019-10-14 21:42:34,156 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:34" (1/1) ... [2019-10-14 21:42:34,162 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:34" (1/1) ... [2019-10-14 21:42:34,163 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:34" (1/1) ... [2019-10-14 21:42:34,171 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:34" (1/1) ... [2019-10-14 21:42:34,177 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:34" (1/1) ... [2019-10-14 21:42:34,179 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:34" (1/1) ... [2019-10-14 21:42:34,181 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 21:42:34,182 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 21:42:34,182 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 21:42:34,182 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 21:42:34,183 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:34" (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 21:42:34,232 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 21:42:34,233 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 21:42:34,233 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 21:42:34,233 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 21:42:34,233 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 21:42:34,233 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 21:42:34,233 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-14 21:42:34,233 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 21:42:34,234 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-14 21:42:34,234 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-14 21:42:34,234 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-14 21:42:34,234 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-14 21:42:34,234 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 21:42:34,234 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 21:42:34,508 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 21:42:34,509 INFO L284 CfgBuilder]: Removed 5 assume(true) statements. [2019-10-14 21:42:34,511 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:42:34 BoogieIcfgContainer [2019-10-14 21:42:34,511 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 21:42:34,524 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 21:42:34,524 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 21:42:34,529 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 21:42:34,529 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 09:42:33" (1/3) ... [2019-10-14 21:42:34,539 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@275c4db3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:42:34, skipping insertion in model container [2019-10-14 21:42:34,539 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:34" (2/3) ... [2019-10-14 21:42:34,540 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@275c4db3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:42:34, skipping insertion in model container [2019-10-14 21:42:34,540 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:42:34" (3/3) ... [2019-10-14 21:42:34,544 INFO L109 eAbstractionObserver]: Analyzing ICFG sorting_bubblesort_2_ground.i [2019-10-14 21:42:34,565 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 21:42:34,574 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 21:42:34,595 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 21:42:34,617 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 21:42:34,617 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 21:42:34,617 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 21:42:34,618 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 21:42:34,618 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 21:42:34,618 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 21:42:34,618 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 21:42:34,618 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 21:42:34,634 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states. [2019-10-14 21:42:34,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-14 21:42:34,640 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:34,641 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:34,643 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:34,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:34,648 INFO L82 PathProgramCache]: Analyzing trace with hash -1296691801, now seen corresponding path program 1 times [2019-10-14 21:42:34,654 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:34,655 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1221788099] [2019-10-14 21:42:34,655 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:34,655 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:34,655 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:34,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:34,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:34,831 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 21:42:34,832 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1221788099] [2019-10-14 21:42:34,833 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:42:34,833 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 21:42:34,834 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729696041] [2019-10-14 21:42:34,839 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 21:42:34,839 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:34,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 21:42:34,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:42:34,860 INFO L87 Difference]: Start difference. First operand 31 states. Second operand 3 states. [2019-10-14 21:42:34,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:34,993 INFO L93 Difference]: Finished difference Result 54 states and 75 transitions. [2019-10-14 21:42:34,994 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 21:42:34,995 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2019-10-14 21:42:34,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:35,005 INFO L225 Difference]: With dead ends: 54 [2019-10-14 21:42:35,005 INFO L226 Difference]: Without dead ends: 26 [2019-10-14 21:42:35,012 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 21:42:35,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-10-14 21:42:35,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-10-14 21:42:35,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-10-14 21:42:35,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2019-10-14 21:42:35,070 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 16 [2019-10-14 21:42:35,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:35,070 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2019-10-14 21:42:35,071 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 21:42:35,071 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2019-10-14 21:42:35,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-14 21:42:35,073 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:35,073 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:35,073 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:35,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:35,075 INFO L82 PathProgramCache]: Analyzing trace with hash -1547542812, now seen corresponding path program 1 times [2019-10-14 21:42:35,075 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:35,075 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [851423483] [2019-10-14 21:42:35,075 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:35,076 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:35,076 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:35,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:35,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:35,185 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 21:42:35,185 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [851423483] [2019-10-14 21:42:35,186 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:42:35,186 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:42:35,190 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842474543] [2019-10-14 21:42:35,192 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:42:35,192 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:35,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:42:35,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:42:35,194 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand 4 states. [2019-10-14 21:42:35,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:35,284 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2019-10-14 21:42:35,284 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:42:35,284 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2019-10-14 21:42:35,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:35,286 INFO L225 Difference]: With dead ends: 46 [2019-10-14 21:42:35,286 INFO L226 Difference]: Without dead ends: 28 [2019-10-14 21:42:35,287 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 21:42:35,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-10-14 21:42:35,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2019-10-14 21:42:35,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-10-14 21:42:35,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 32 transitions. [2019-10-14 21:42:35,295 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 32 transitions. Word has length 16 [2019-10-14 21:42:35,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:35,295 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 32 transitions. [2019-10-14 21:42:35,295 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:42:35,296 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 32 transitions. [2019-10-14 21:42:35,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-10-14 21:42:35,297 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:35,297 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:35,297 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:35,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:35,298 INFO L82 PathProgramCache]: Analyzing trace with hash -1387426810, now seen corresponding path program 1 times [2019-10-14 21:42:35,298 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:35,298 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2005009365] [2019-10-14 21:42:35,299 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:35,299 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:35,299 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:35,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:35,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:35,377 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 21:42:35,377 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2005009365] [2019-10-14 21:42:35,377 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:42:35,377 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:42:35,378 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [648798025] [2019-10-14 21:42:35,378 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:42:35,379 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:35,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:42:35,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:42:35,379 INFO L87 Difference]: Start difference. First operand 27 states and 32 transitions. Second operand 4 states. [2019-10-14 21:42:35,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:35,491 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2019-10-14 21:42:35,492 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:42:35,492 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2019-10-14 21:42:35,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:35,493 INFO L225 Difference]: With dead ends: 44 [2019-10-14 21:42:35,494 INFO L226 Difference]: Without dead ends: 31 [2019-10-14 21:42:35,495 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 21:42:35,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-10-14 21:42:35,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2019-10-14 21:42:35,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-10-14 21:42:35,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2019-10-14 21:42:35,506 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 18 [2019-10-14 21:42:35,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:35,507 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2019-10-14 21:42:35,507 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:42:35,507 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2019-10-14 21:42:35,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-14 21:42:35,508 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:35,508 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 21:42:35,509 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:35,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:35,509 INFO L82 PathProgramCache]: Analyzing trace with hash 1108929549, now seen corresponding path program 1 times [2019-10-14 21:42:35,510 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:35,510 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1264779617] [2019-10-14 21:42:35,510 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:35,510 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:35,511 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:35,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:35,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:35,604 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 21:42:35,605 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1264779617] [2019-10-14 21:42:35,605 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:42:35,605 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:42:35,606 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340718423] [2019-10-14 21:42:35,606 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:42:35,607 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:35,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:42:35,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:42:35,607 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand 4 states. [2019-10-14 21:42:35,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:35,713 INFO L93 Difference]: Finished difference Result 56 states and 71 transitions. [2019-10-14 21:42:35,713 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:42:35,713 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2019-10-14 21:42:35,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:35,715 INFO L225 Difference]: With dead ends: 56 [2019-10-14 21:42:35,715 INFO L226 Difference]: Without dead ends: 35 [2019-10-14 21:42:35,715 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 21:42:35,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-10-14 21:42:35,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2019-10-14 21:42:35,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-10-14 21:42:35,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2019-10-14 21:42:35,728 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 20 [2019-10-14 21:42:35,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:35,729 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2019-10-14 21:42:35,729 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:42:35,729 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2019-10-14 21:42:35,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-14 21:42:35,731 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:35,731 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, 1, 1, 1] [2019-10-14 21:42:35,731 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:35,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:35,732 INFO L82 PathProgramCache]: Analyzing trace with hash -2055572838, now seen corresponding path program 1 times [2019-10-14 21:42:35,732 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:35,732 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1318887097] [2019-10-14 21:42:35,733 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:35,735 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:35,735 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:35,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:35,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:35,839 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 21:42:35,840 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1318887097] [2019-10-14 21:42:35,840 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1928284801] [2019-10-14 21:42:35,840 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 21:42:35,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:35,905 INFO L256 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 21:42:35,911 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:35,942 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 21:42:35,943 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:35,943 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-10-14 21:42:35,943 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745971670] [2019-10-14 21:42:35,944 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-14 21:42:35,944 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:35,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-14 21:42:35,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:42:35,945 INFO L87 Difference]: Start difference. First operand 32 states and 39 transitions. Second operand 6 states. [2019-10-14 21:42:36,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:36,032 INFO L93 Difference]: Finished difference Result 58 states and 72 transitions. [2019-10-14 21:42:36,033 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-14 21:42:36,033 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2019-10-14 21:42:36,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:36,034 INFO L225 Difference]: With dead ends: 58 [2019-10-14 21:42:36,034 INFO L226 Difference]: Without dead ends: 35 [2019-10-14 21:42:36,035 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 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 21:42:36,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-10-14 21:42:36,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2019-10-14 21:42:36,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-10-14 21:42:36,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2019-10-14 21:42:36,041 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 23 [2019-10-14 21:42:36,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:36,041 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2019-10-14 21:42:36,042 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-14 21:42:36,042 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2019-10-14 21:42:36,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-10-14 21:42:36,043 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:36,043 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:36,247 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:36,248 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:36,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:36,248 INFO L82 PathProgramCache]: Analyzing trace with hash 442145592, now seen corresponding path program 2 times [2019-10-14 21:42:36,248 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:36,249 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [750537580] [2019-10-14 21:42:36,249 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:36,249 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:36,249 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:36,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:36,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:36,344 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:42:36,344 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [750537580] [2019-10-14 21:42:36,345 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2016300188] [2019-10-14 21:42:36,345 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 21:42:36,393 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:42:36,393 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:36,394 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:42:36,396 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:36,411 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:42:36,412 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:36,412 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-10-14 21:42:36,412 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231278137] [2019-10-14 21:42:36,413 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 21:42:36,413 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:36,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 21:42:36,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:42:36,414 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand 7 states. [2019-10-14 21:42:36,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:36,484 INFO L93 Difference]: Finished difference Result 60 states and 74 transitions. [2019-10-14 21:42:36,484 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 21:42:36,485 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2019-10-14 21:42:36,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:36,485 INFO L225 Difference]: With dead ends: 60 [2019-10-14 21:42:36,486 INFO L226 Difference]: Without dead ends: 37 [2019-10-14 21:42:36,486 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 26 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 21:42:36,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-10-14 21:42:36,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2019-10-14 21:42:36,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-10-14 21:42:36,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 43 transitions. [2019-10-14 21:42:36,492 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 43 transitions. Word has length 25 [2019-10-14 21:42:36,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:36,492 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 43 transitions. [2019-10-14 21:42:36,492 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 21:42:36,493 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 43 transitions. [2019-10-14 21:42:36,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-14 21:42:36,493 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:36,494 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:36,702 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:36,702 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:36,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:36,702 INFO L82 PathProgramCache]: Analyzing trace with hash -137161642, now seen corresponding path program 3 times [2019-10-14 21:42:36,703 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:36,703 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1946167270] [2019-10-14 21:42:36,703 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:36,703 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:36,703 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:36,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:36,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:36,796 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:42:36,797 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1946167270] [2019-10-14 21:42:36,797 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1436941674] [2019-10-14 21:42:36,797 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 21:42:36,847 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-14 21:42:36,847 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:36,848 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 21:42:36,853 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:36,881 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-14 21:42:36,884 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:36,884 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4] total 9 [2019-10-14 21:42:36,884 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136737693] [2019-10-14 21:42:36,885 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 21:42:36,885 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:36,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 21:42:36,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:42:36,886 INFO L87 Difference]: Start difference. First operand 36 states and 43 transitions. Second operand 9 states. [2019-10-14 21:42:37,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:37,014 INFO L93 Difference]: Finished difference Result 71 states and 90 transitions. [2019-10-14 21:42:37,015 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 21:42:37,015 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2019-10-14 21:42:37,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:37,016 INFO L225 Difference]: With dead ends: 71 [2019-10-14 21:42:37,016 INFO L226 Difference]: Without dead ends: 48 [2019-10-14 21:42:37,017 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:42:37,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-10-14 21:42:37,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 43. [2019-10-14 21:42:37,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-10-14 21:42:37,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2019-10-14 21:42:37,023 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 27 [2019-10-14 21:42:37,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:37,023 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2019-10-14 21:42:37,023 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 21:42:37,024 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2019-10-14 21:42:37,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-10-14 21:42:37,025 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:37,025 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:37,229 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:37,229 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:37,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:37,229 INFO L82 PathProgramCache]: Analyzing trace with hash -890436781, now seen corresponding path program 4 times [2019-10-14 21:42:37,230 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:37,230 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [601830093] [2019-10-14 21:42:37,230 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:37,230 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:37,230 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:37,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:37,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:37,333 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-14 21:42:37,334 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [601830093] [2019-10-14 21:42:37,334 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [722882873] [2019-10-14 21:42:37,335 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 21:42:37,384 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:42:37,385 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:37,386 INFO L256 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 21:42:37,390 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:37,413 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-14 21:42:37,414 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:37,415 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-10-14 21:42:37,415 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1480510468] [2019-10-14 21:42:37,417 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 21:42:37,417 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:37,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 21:42:37,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:42:37,419 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 9 states. [2019-10-14 21:42:37,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:37,517 INFO L93 Difference]: Finished difference Result 74 states and 90 transitions. [2019-10-14 21:42:37,517 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-14 21:42:37,517 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 32 [2019-10-14 21:42:37,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:37,518 INFO L225 Difference]: With dead ends: 74 [2019-10-14 21:42:37,518 INFO L226 Difference]: Without dead ends: 46 [2019-10-14 21:42:37,519 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 33 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 21:42:37,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-10-14 21:42:37,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2019-10-14 21:42:37,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-10-14 21:42:37,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2019-10-14 21:42:37,533 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 32 [2019-10-14 21:42:37,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:37,534 INFO L462 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2019-10-14 21:42:37,534 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 21:42:37,534 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2019-10-14 21:42:37,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-10-14 21:42:37,539 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:37,539 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:37,743 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:37,744 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:37,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:37,744 INFO L82 PathProgramCache]: Analyzing trace with hash -250762123, now seen corresponding path program 5 times [2019-10-14 21:42:37,744 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:37,745 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1343137644] [2019-10-14 21:42:37,745 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:37,745 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:37,745 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:37,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:37,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:37,871 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-14 21:42:37,871 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1343137644] [2019-10-14 21:42:37,871 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1184069005] [2019-10-14 21:42:37,871 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 21:42:37,919 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2019-10-14 21:42:37,920 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:37,921 INFO L256 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:42:37,923 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:37,967 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-14 21:42:37,967 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:37,968 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 5] total 12 [2019-10-14 21:42:37,968 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1580771310] [2019-10-14 21:42:37,970 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-14 21:42:37,970 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:37,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-14 21:42:37,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:42:37,971 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand 12 states. [2019-10-14 21:42:38,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:38,076 INFO L93 Difference]: Finished difference Result 86 states and 108 transitions. [2019-10-14 21:42:38,076 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 21:42:38,076 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2019-10-14 21:42:38,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:38,077 INFO L225 Difference]: With dead ends: 86 [2019-10-14 21:42:38,077 INFO L226 Difference]: Without dead ends: 58 [2019-10-14 21:42:38,078 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:42:38,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-10-14 21:42:38,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 53. [2019-10-14 21:42:38,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-10-14 21:42:38,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 63 transitions. [2019-10-14 21:42:38,087 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 63 transitions. Word has length 34 [2019-10-14 21:42:38,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:38,090 INFO L462 AbstractCegarLoop]: Abstraction has 53 states and 63 transitions. [2019-10-14 21:42:38,090 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-14 21:42:38,090 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 63 transitions. [2019-10-14 21:42:38,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-10-14 21:42:38,093 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:38,093 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:38,296 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:38,297 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:38,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:38,297 INFO L82 PathProgramCache]: Analyzing trace with hash -1537034928, now seen corresponding path program 6 times [2019-10-14 21:42:38,298 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:38,298 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1372646531] [2019-10-14 21:42:38,299 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:38,299 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:38,299 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:38,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:38,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:38,411 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2019-10-14 21:42:38,412 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1372646531] [2019-10-14 21:42:38,412 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1924920429] [2019-10-14 21:42:38,412 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 21:42:38,474 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-10-14 21:42:38,474 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:38,475 INFO L256 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-14 21:42:38,477 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:38,523 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-14 21:42:38,523 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:38,523 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6] total 14 [2019-10-14 21:42:38,523 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083287343] [2019-10-14 21:42:38,524 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-14 21:42:38,524 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:38,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-14 21:42:38,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:42:38,525 INFO L87 Difference]: Start difference. First operand 53 states and 63 transitions. Second operand 14 states. [2019-10-14 21:42:38,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:38,690 INFO L93 Difference]: Finished difference Result 100 states and 126 transitions. [2019-10-14 21:42:38,690 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 21:42:38,690 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2019-10-14 21:42:38,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:38,691 INFO L225 Difference]: With dead ends: 100 [2019-10-14 21:42:38,691 INFO L226 Difference]: Without dead ends: 66 [2019-10-14 21:42:38,692 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:42:38,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-10-14 21:42:38,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 61. [2019-10-14 21:42:38,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-10-14 21:42:38,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 73 transitions. [2019-10-14 21:42:38,699 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 73 transitions. Word has length 39 [2019-10-14 21:42:38,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:38,699 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 73 transitions. [2019-10-14 21:42:38,699 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-14 21:42:38,700 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 73 transitions. [2019-10-14 21:42:38,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-10-14 21:42:38,701 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:38,701 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:38,901 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:38,902 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:38,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:38,902 INFO L82 PathProgramCache]: Analyzing trace with hash 747611417, now seen corresponding path program 7 times [2019-10-14 21:42:38,902 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:38,903 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [3172063] [2019-10-14 21:42:38,903 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:38,903 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:38,903 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:38,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:39,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:39,036 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-14 21:42:39,036 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [3172063] [2019-10-14 21:42:39,037 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [889108345] [2019-10-14 21:42:39,037 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 21:42:39,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:39,092 INFO L256 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 21:42:39,101 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:39,135 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-14 21:42:39,136 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:39,136 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-10-14 21:42:39,136 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463676253] [2019-10-14 21:42:39,137 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-14 21:42:39,137 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:39,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-14 21:42:39,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:42:39,138 INFO L87 Difference]: Start difference. First operand 61 states and 73 transitions. Second operand 12 states. [2019-10-14 21:42:39,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:39,220 INFO L93 Difference]: Finished difference Result 104 states and 128 transitions. [2019-10-14 21:42:39,221 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-14 21:42:39,221 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 44 [2019-10-14 21:42:39,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:39,222 INFO L225 Difference]: With dead ends: 104 [2019-10-14 21:42:39,222 INFO L226 Difference]: Without dead ends: 64 [2019-10-14 21:42:39,223 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 45 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 21:42:39,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-10-14 21:42:39,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2019-10-14 21:42:39,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2019-10-14 21:42:39,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 75 transitions. [2019-10-14 21:42:39,229 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 75 transitions. Word has length 44 [2019-10-14 21:42:39,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:39,229 INFO L462 AbstractCegarLoop]: Abstraction has 63 states and 75 transitions. [2019-10-14 21:42:39,230 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-14 21:42:39,230 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 75 transitions. [2019-10-14 21:42:39,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-10-14 21:42:39,231 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:39,231 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:39,442 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:39,442 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:39,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:39,443 INFO L82 PathProgramCache]: Analyzing trace with hash 1331800891, now seen corresponding path program 8 times [2019-10-14 21:42:39,443 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:39,443 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1307339812] [2019-10-14 21:42:39,443 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:39,443 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:39,444 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:39,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:39,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:39,567 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-14 21:42:39,567 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1307339812] [2019-10-14 21:42:39,568 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [400761396] [2019-10-14 21:42:39,568 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 21:42:39,622 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:42:39,622 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:39,623 INFO L256 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 21:42:39,625 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:39,652 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-14 21:42:39,653 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:39,653 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-10-14 21:42:39,653 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604393936] [2019-10-14 21:42:39,654 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-14 21:42:39,654 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:39,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-14 21:42:39,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:42:39,655 INFO L87 Difference]: Start difference. First operand 63 states and 75 transitions. Second operand 13 states. [2019-10-14 21:42:39,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:39,743 INFO L93 Difference]: Finished difference Result 106 states and 130 transitions. [2019-10-14 21:42:39,743 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 21:42:39,743 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 46 [2019-10-14 21:42:39,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:39,745 INFO L225 Difference]: With dead ends: 106 [2019-10-14 21:42:39,745 INFO L226 Difference]: Without dead ends: 66 [2019-10-14 21:42:39,746 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 47 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 21:42:39,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-10-14 21:42:39,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2019-10-14 21:42:39,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2019-10-14 21:42:39,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 77 transitions. [2019-10-14 21:42:39,752 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 77 transitions. Word has length 46 [2019-10-14 21:42:39,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:39,753 INFO L462 AbstractCegarLoop]: Abstraction has 65 states and 77 transitions. [2019-10-14 21:42:39,753 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-14 21:42:39,753 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 77 transitions. [2019-10-14 21:42:39,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-10-14 21:42:39,754 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:39,754 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:39,959 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:39,960 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:39,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:39,960 INFO L82 PathProgramCache]: Analyzing trace with hash 97169629, now seen corresponding path program 9 times [2019-10-14 21:42:39,960 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:39,960 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [451452318] [2019-10-14 21:42:39,960 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:39,961 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:39,961 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:39,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:40,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:40,099 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-14 21:42:40,099 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [451452318] [2019-10-14 21:42:40,100 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1008292687] [2019-10-14 21:42:40,100 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 21:42:40,156 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-10-14 21:42:40,156 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:40,157 INFO L256 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 21:42:40,159 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:40,231 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 1 proven. 22 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-14 21:42:40,232 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:40,232 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 7] total 18 [2019-10-14 21:42:40,232 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173332740] [2019-10-14 21:42:40,233 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-14 21:42:40,233 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:40,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-14 21:42:40,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=218, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:42:40,234 INFO L87 Difference]: Start difference. First operand 65 states and 77 transitions. Second operand 18 states. [2019-10-14 21:42:40,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:40,426 INFO L93 Difference]: Finished difference Result 118 states and 148 transitions. [2019-10-14 21:42:40,426 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-14 21:42:40,426 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 48 [2019-10-14 21:42:40,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:40,427 INFO L225 Difference]: With dead ends: 118 [2019-10-14 21:42:40,427 INFO L226 Difference]: Without dead ends: 78 [2019-10-14 21:42:40,428 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=218, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:42:40,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2019-10-14 21:42:40,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 73. [2019-10-14 21:42:40,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-10-14 21:42:40,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 87 transitions. [2019-10-14 21:42:40,434 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 87 transitions. Word has length 48 [2019-10-14 21:42:40,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:40,434 INFO L462 AbstractCegarLoop]: Abstraction has 73 states and 87 transitions. [2019-10-14 21:42:40,434 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-14 21:42:40,435 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 87 transitions. [2019-10-14 21:42:40,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2019-10-14 21:42:40,435 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:40,436 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:40,639 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:40,640 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:40,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:40,640 INFO L82 PathProgramCache]: Analyzing trace with hash 830729064, now seen corresponding path program 10 times [2019-10-14 21:42:40,641 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:40,641 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687443325] [2019-10-14 21:42:40,641 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:40,641 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:40,642 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:40,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:40,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:40,771 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-14 21:42:40,771 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1687443325] [2019-10-14 21:42:40,771 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [539443211] [2019-10-14 21:42:40,772 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 21:42:40,824 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:42:40,824 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:40,825 INFO L256 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 21:42:40,827 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:40,857 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-14 21:42:40,858 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:40,858 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-10-14 21:42:40,858 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888819967] [2019-10-14 21:42:40,858 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-14 21:42:40,859 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:40,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-14 21:42:40,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:42:40,859 INFO L87 Difference]: Start difference. First operand 73 states and 87 transitions. Second operand 15 states. [2019-10-14 21:42:40,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:41,000 INFO L93 Difference]: Finished difference Result 122 states and 150 transitions. [2019-10-14 21:42:41,000 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 21:42:41,000 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 53 [2019-10-14 21:42:41,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:41,001 INFO L225 Difference]: With dead ends: 122 [2019-10-14 21:42:41,001 INFO L226 Difference]: Without dead ends: 76 [2019-10-14 21:42:41,002 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:42:41,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-10-14 21:42:41,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2019-10-14 21:42:41,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2019-10-14 21:42:41,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 89 transitions. [2019-10-14 21:42:41,008 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 89 transitions. Word has length 53 [2019-10-14 21:42:41,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:41,008 INFO L462 AbstractCegarLoop]: Abstraction has 75 states and 89 transitions. [2019-10-14 21:42:41,009 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-14 21:42:41,009 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 89 transitions. [2019-10-14 21:42:41,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-10-14 21:42:41,010 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:41,010 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:41,220 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:41,220 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:41,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:41,220 INFO L82 PathProgramCache]: Analyzing trace with hash 1163504518, now seen corresponding path program 11 times [2019-10-14 21:42:41,221 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:41,221 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [532234306] [2019-10-14 21:42:41,221 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:41,221 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:41,221 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:41,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:41,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:41,353 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-14 21:42:41,354 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [532234306] [2019-10-14 21:42:41,354 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [280742681] [2019-10-14 21:42:41,354 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 21:42:41,435 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2019-10-14 21:42:41,435 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:41,436 INFO L256 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 21:42:41,438 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:41,532 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 1 proven. 35 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-10-14 21:42:41,532 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:41,532 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 8] total 21 [2019-10-14 21:42:41,532 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547566401] [2019-10-14 21:42:41,533 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-14 21:42:41,533 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:41,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-14 21:42:41,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=300, Unknown=0, NotChecked=0, Total=420 [2019-10-14 21:42:41,534 INFO L87 Difference]: Start difference. First operand 75 states and 89 transitions. Second operand 21 states. [2019-10-14 21:42:41,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:41,700 INFO L93 Difference]: Finished difference Result 134 states and 168 transitions. [2019-10-14 21:42:41,700 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-14 21:42:41,701 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 55 [2019-10-14 21:42:41,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:41,702 INFO L225 Difference]: With dead ends: 134 [2019-10-14 21:42:41,702 INFO L226 Difference]: Without dead ends: 88 [2019-10-14 21:42:41,703 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=300, Unknown=0, NotChecked=0, Total=420 [2019-10-14 21:42:41,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2019-10-14 21:42:41,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 83. [2019-10-14 21:42:41,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2019-10-14 21:42:41,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 99 transitions. [2019-10-14 21:42:41,712 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 99 transitions. Word has length 55 [2019-10-14 21:42:41,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:41,713 INFO L462 AbstractCegarLoop]: Abstraction has 83 states and 99 transitions. [2019-10-14 21:42:41,713 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-14 21:42:41,714 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 99 transitions. [2019-10-14 21:42:41,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2019-10-14 21:42:41,714 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:41,715 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:41,915 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:41,915 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:41,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:41,916 INFO L82 PathProgramCache]: Analyzing trace with hash -264767709, now seen corresponding path program 12 times [2019-10-14 21:42:41,916 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:41,917 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1362205764] [2019-10-14 21:42:41,917 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:41,917 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:41,918 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:41,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:42,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:42,094 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2019-10-14 21:42:42,094 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1362205764] [2019-10-14 21:42:42,094 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2090008696] [2019-10-14 21:42:42,095 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 21:42:42,315 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-10-14 21:42:42,316 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:42,317 INFO L256 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 21:42:42,319 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:42,431 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 1 proven. 51 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-10-14 21:42:42,432 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:42,432 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 9] total 23 [2019-10-14 21:42:42,432 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1899488856] [2019-10-14 21:42:42,433 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-14 21:42:42,433 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:42,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-14 21:42:42,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=364, Unknown=0, NotChecked=0, Total=506 [2019-10-14 21:42:42,434 INFO L87 Difference]: Start difference. First operand 83 states and 99 transitions. Second operand 23 states. [2019-10-14 21:42:42,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:42,628 INFO L93 Difference]: Finished difference Result 148 states and 186 transitions. [2019-10-14 21:42:42,628 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-10-14 21:42:42,628 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2019-10-14 21:42:42,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:42,629 INFO L225 Difference]: With dead ends: 148 [2019-10-14 21:42:42,630 INFO L226 Difference]: Without dead ends: 96 [2019-10-14 21:42:42,631 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=142, Invalid=364, Unknown=0, NotChecked=0, Total=506 [2019-10-14 21:42:42,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2019-10-14 21:42:42,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 91. [2019-10-14 21:42:42,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2019-10-14 21:42:42,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 109 transitions. [2019-10-14 21:42:42,644 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 109 transitions. Word has length 60 [2019-10-14 21:42:42,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:42,644 INFO L462 AbstractCegarLoop]: Abstraction has 91 states and 109 transitions. [2019-10-14 21:42:42,644 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-14 21:42:42,644 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 109 transitions. [2019-10-14 21:42:42,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2019-10-14 21:42:42,645 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:42,645 INFO L380 BasicCegarLoop]: trace histogram [13, 13, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:42,846 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:42,846 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:42,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:42,847 INFO L82 PathProgramCache]: Analyzing trace with hash 980957794, now seen corresponding path program 13 times [2019-10-14 21:42:42,847 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:42,847 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [170444891] [2019-10-14 21:42:42,848 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:42,848 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:42,851 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:42,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:43,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:43,099 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2019-10-14 21:42:43,102 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [170444891] [2019-10-14 21:42:43,102 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [447633913] [2019-10-14 21:42:43,102 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 21:42:43,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:43,168 INFO L256 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-14 21:42:43,170 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:43,192 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2019-10-14 21:42:43,193 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:43,193 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-10-14 21:42:43,193 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581956682] [2019-10-14 21:42:43,194 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-14 21:42:43,194 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:43,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-14 21:42:43,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:42:43,195 INFO L87 Difference]: Start difference. First operand 91 states and 109 transitions. Second operand 18 states. [2019-10-14 21:42:43,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:43,388 INFO L93 Difference]: Finished difference Result 152 states and 188 transitions. [2019-10-14 21:42:43,388 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-14 21:42:43,388 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 65 [2019-10-14 21:42:43,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:43,389 INFO L225 Difference]: With dead ends: 152 [2019-10-14 21:42:43,389 INFO L226 Difference]: Without dead ends: 94 [2019-10-14 21:42:43,390 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 66 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 21:42:43,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2019-10-14 21:42:43,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2019-10-14 21:42:43,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2019-10-14 21:42:43,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 111 transitions. [2019-10-14 21:42:43,394 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 111 transitions. Word has length 65 [2019-10-14 21:42:43,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:43,395 INFO L462 AbstractCegarLoop]: Abstraction has 93 states and 111 transitions. [2019-10-14 21:42:43,395 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-14 21:42:43,395 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 111 transitions. [2019-10-14 21:42:43,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-10-14 21:42:43,396 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:43,396 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:43,601 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:43,602 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:43,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:43,603 INFO L82 PathProgramCache]: Analyzing trace with hash 1862843776, now seen corresponding path program 14 times [2019-10-14 21:42:43,603 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:43,603 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [783710435] [2019-10-14 21:42:43,603 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:43,604 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:43,604 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:43,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:43,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:43,784 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2019-10-14 21:42:43,784 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [783710435] [2019-10-14 21:42:43,784 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1336144696] [2019-10-14 21:42:43,784 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 21:42:43,849 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:42:43,849 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:43,850 INFO L256 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-14 21:42:43,852 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:43,869 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2019-10-14 21:42:43,870 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:43,870 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-10-14 21:42:43,870 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962306330] [2019-10-14 21:42:43,871 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-14 21:42:43,871 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:43,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-14 21:42:43,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:42:43,871 INFO L87 Difference]: Start difference. First operand 93 states and 111 transitions. Second operand 19 states. [2019-10-14 21:42:44,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:44,015 INFO L93 Difference]: Finished difference Result 154 states and 190 transitions. [2019-10-14 21:42:44,015 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-14 21:42:44,015 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 67 [2019-10-14 21:42:44,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:44,016 INFO L225 Difference]: With dead ends: 154 [2019-10-14 21:42:44,016 INFO L226 Difference]: Without dead ends: 96 [2019-10-14 21:42:44,017 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 68 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 21:42:44,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2019-10-14 21:42:44,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2019-10-14 21:42:44,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2019-10-14 21:42:44,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 113 transitions. [2019-10-14 21:42:44,022 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 113 transitions. Word has length 67 [2019-10-14 21:42:44,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:44,023 INFO L462 AbstractCegarLoop]: Abstraction has 95 states and 113 transitions. [2019-10-14 21:42:44,023 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-14 21:42:44,023 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 113 transitions. [2019-10-14 21:42:44,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-10-14 21:42:44,024 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:44,024 INFO L380 BasicCegarLoop]: trace histogram [15, 15, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:44,228 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:44,228 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:44,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:44,229 INFO L82 PathProgramCache]: Analyzing trace with hash -1048252130, now seen corresponding path program 15 times [2019-10-14 21:42:44,229 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:44,230 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1829251201] [2019-10-14 21:42:44,230 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:44,230 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:44,230 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:44,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:44,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:44,465 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2019-10-14 21:42:44,465 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1829251201] [2019-10-14 21:42:44,465 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [843714269] [2019-10-14 21:42:44,466 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 21:42:44,551 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-10-14 21:42:44,551 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:44,552 INFO L256 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 21:42:44,554 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:44,709 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 1 proven. 70 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2019-10-14 21:42:44,710 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:44,710 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 10] total 27 [2019-10-14 21:42:44,710 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1341465962] [2019-10-14 21:42:44,711 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-10-14 21:42:44,711 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:44,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-10-14 21:42:44,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=503, Unknown=0, NotChecked=0, Total=702 [2019-10-14 21:42:44,712 INFO L87 Difference]: Start difference. First operand 95 states and 113 transitions. Second operand 27 states. [2019-10-14 21:42:44,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:44,924 INFO L93 Difference]: Finished difference Result 166 states and 208 transitions. [2019-10-14 21:42:44,924 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-10-14 21:42:44,924 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 69 [2019-10-14 21:42:44,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:44,925 INFO L225 Difference]: With dead ends: 166 [2019-10-14 21:42:44,925 INFO L226 Difference]: Without dead ends: 108 [2019-10-14 21:42:44,926 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=199, Invalid=503, Unknown=0, NotChecked=0, Total=702 [2019-10-14 21:42:44,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2019-10-14 21:42:44,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 103. [2019-10-14 21:42:44,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2019-10-14 21:42:44,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 123 transitions. [2019-10-14 21:42:44,932 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 123 transitions. Word has length 69 [2019-10-14 21:42:44,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:44,932 INFO L462 AbstractCegarLoop]: Abstraction has 103 states and 123 transitions. [2019-10-14 21:42:44,932 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-10-14 21:42:44,933 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 123 transitions. [2019-10-14 21:42:44,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2019-10-14 21:42:44,934 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:44,934 INFO L380 BasicCegarLoop]: trace histogram [16, 16, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:45,138 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:45,138 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:45,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:45,138 INFO L82 PathProgramCache]: Analyzing trace with hash -1331337461, now seen corresponding path program 16 times [2019-10-14 21:42:45,139 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:45,139 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1315573851] [2019-10-14 21:42:45,139 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:45,139 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:45,139 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:45,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:45,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:45,322 INFO L134 CoverageAnalysis]: Checked inductivity of 349 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2019-10-14 21:42:45,322 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1315573851] [2019-10-14 21:42:45,323 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [388555988] [2019-10-14 21:42:45,323 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 21:42:45,385 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:42:45,385 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:45,386 INFO L256 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 21:42:45,388 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:45,560 INFO L134 CoverageAnalysis]: Checked inductivity of 349 backedges. 1 proven. 92 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2019-10-14 21:42:45,561 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:45,561 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 11] total 29 [2019-10-14 21:42:45,561 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1350274581] [2019-10-14 21:42:45,563 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-10-14 21:42:45,563 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:45,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-10-14 21:42:45,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=585, Unknown=0, NotChecked=0, Total=812 [2019-10-14 21:42:45,564 INFO L87 Difference]: Start difference. First operand 103 states and 123 transitions. Second operand 29 states. [2019-10-14 21:42:45,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:45,738 INFO L93 Difference]: Finished difference Result 180 states and 226 transitions. [2019-10-14 21:42:45,739 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-10-14 21:42:45,739 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 74 [2019-10-14 21:42:45,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:45,740 INFO L225 Difference]: With dead ends: 180 [2019-10-14 21:42:45,740 INFO L226 Difference]: Without dead ends: 116 [2019-10-14 21:42:45,741 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=227, Invalid=585, Unknown=0, NotChecked=0, Total=812 [2019-10-14 21:42:45,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2019-10-14 21:42:45,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 111. [2019-10-14 21:42:45,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2019-10-14 21:42:45,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 133 transitions. [2019-10-14 21:42:45,747 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 133 transitions. Word has length 74 [2019-10-14 21:42:45,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:45,747 INFO L462 AbstractCegarLoop]: Abstraction has 111 states and 133 transitions. [2019-10-14 21:42:45,747 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-10-14 21:42:45,747 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 133 transitions. [2019-10-14 21:42:45,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2019-10-14 21:42:45,748 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:45,748 INFO L380 BasicCegarLoop]: trace histogram [17, 17, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:45,949 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:45,949 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:45,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:45,949 INFO L82 PathProgramCache]: Analyzing trace with hash 261485818, now seen corresponding path program 17 times [2019-10-14 21:42:45,949 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:45,949 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1643285033] [2019-10-14 21:42:45,950 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:45,950 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:45,950 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:45,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:46,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:46,172 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2019-10-14 21:42:46,173 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1643285033] [2019-10-14 21:42:46,173 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2083692267] [2019-10-14 21:42:46,173 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 [2019-10-14 21:42:46,453 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2019-10-14 21:42:46,454 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:46,456 INFO L256 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-14 21:42:46,457 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:46,620 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 1 proven. 117 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2019-10-14 21:42:46,621 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:46,621 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 12] total 31 [2019-10-14 21:42:46,621 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079098503] [2019-10-14 21:42:46,621 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-10-14 21:42:46,621 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:46,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-10-14 21:42:46,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=673, Unknown=0, NotChecked=0, Total=930 [2019-10-14 21:42:46,622 INFO L87 Difference]: Start difference. First operand 111 states and 133 transitions. Second operand 31 states. [2019-10-14 21:42:46,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:46,880 INFO L93 Difference]: Finished difference Result 194 states and 244 transitions. [2019-10-14 21:42:46,881 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-10-14 21:42:46,881 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 79 [2019-10-14 21:42:46,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:46,882 INFO L225 Difference]: With dead ends: 194 [2019-10-14 21:42:46,882 INFO L226 Difference]: Without dead ends: 124 [2019-10-14 21:42:46,883 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=257, Invalid=673, Unknown=0, NotChecked=0, Total=930 [2019-10-14 21:42:46,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2019-10-14 21:42:46,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 119. [2019-10-14 21:42:46,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2019-10-14 21:42:46,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 143 transitions. [2019-10-14 21:42:46,888 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 143 transitions. Word has length 79 [2019-10-14 21:42:46,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:46,889 INFO L462 AbstractCegarLoop]: Abstraction has 119 states and 143 transitions. [2019-10-14 21:42:46,889 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-10-14 21:42:46,889 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 143 transitions. [2019-10-14 21:42:46,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2019-10-14 21:42:46,890 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:46,890 INFO L380 BasicCegarLoop]: trace histogram [18, 18, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:47,101 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:47,101 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:47,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:47,101 INFO L82 PathProgramCache]: Analyzing trace with hash -1674935505, now seen corresponding path program 18 times [2019-10-14 21:42:47,102 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:47,102 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2073585897] [2019-10-14 21:42:47,102 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:47,102 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:47,102 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:47,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:47,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:47,347 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-10-14 21:42:47,347 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2073585897] [2019-10-14 21:42:47,348 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1587036802] [2019-10-14 21:42:47,348 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:47,914 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2019-10-14 21:42:47,914 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:47,917 INFO L256 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 20 conjunts are in the unsatisfiable core [2019-10-14 21:42:47,918 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:47,941 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-10-14 21:42:47,941 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:47,941 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2019-10-14 21:42:47,942 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405828000] [2019-10-14 21:42:47,942 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-14 21:42:47,942 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:47,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-14 21:42:47,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-10-14 21:42:47,943 INFO L87 Difference]: Start difference. First operand 119 states and 143 transitions. Second operand 23 states. [2019-10-14 21:42:48,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:48,108 INFO L93 Difference]: Finished difference Result 198 states and 246 transitions. [2019-10-14 21:42:48,111 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-10-14 21:42:48,111 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 84 [2019-10-14 21:42:48,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:48,112 INFO L225 Difference]: With dead ends: 198 [2019-10-14 21:42:48,112 INFO L226 Difference]: Without dead ends: 122 [2019-10-14 21:42:48,113 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-10-14 21:42:48,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2019-10-14 21:42:48,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2019-10-14 21:42:48,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2019-10-14 21:42:48,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 145 transitions. [2019-10-14 21:42:48,119 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 145 transitions. Word has length 84 [2019-10-14 21:42:48,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:48,119 INFO L462 AbstractCegarLoop]: Abstraction has 121 states and 145 transitions. [2019-10-14 21:42:48,119 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-14 21:42:48,119 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 145 transitions. [2019-10-14 21:42:48,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2019-10-14 21:42:48,120 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:48,121 INFO L380 BasicCegarLoop]: trace histogram [19, 19, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:48,331 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:48,332 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:48,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:48,332 INFO L82 PathProgramCache]: Analyzing trace with hash 1933852497, now seen corresponding path program 19 times [2019-10-14 21:42:48,332 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:48,333 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [582209641] [2019-10-14 21:42:48,333 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:48,333 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:48,333 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:48,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:48,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:48,572 INFO L134 CoverageAnalysis]: Checked inductivity of 507 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-10-14 21:42:48,573 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [582209641] [2019-10-14 21:42:48,577 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [122348628] [2019-10-14 21:42:48,577 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:48,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:48,646 INFO L256 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-14 21:42:48,648 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:48,666 INFO L134 CoverageAnalysis]: Checked inductivity of 507 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-10-14 21:42:48,666 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:48,666 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2019-10-14 21:42:48,666 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061554160] [2019-10-14 21:42:48,667 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-14 21:42:48,667 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:48,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-14 21:42:48,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-10-14 21:42:48,668 INFO L87 Difference]: Start difference. First operand 121 states and 145 transitions. Second operand 24 states. [2019-10-14 21:42:48,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:48,804 INFO L93 Difference]: Finished difference Result 200 states and 248 transitions. [2019-10-14 21:42:48,805 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-10-14 21:42:48,805 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 86 [2019-10-14 21:42:48,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:48,806 INFO L225 Difference]: With dead ends: 200 [2019-10-14 21:42:48,807 INFO L226 Difference]: Without dead ends: 124 [2019-10-14 21:42:48,807 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-10-14 21:42:48,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2019-10-14 21:42:48,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2019-10-14 21:42:48,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2019-10-14 21:42:48,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 147 transitions. [2019-10-14 21:42:48,814 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 147 transitions. Word has length 86 [2019-10-14 21:42:48,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:48,814 INFO L462 AbstractCegarLoop]: Abstraction has 123 states and 147 transitions. [2019-10-14 21:42:48,814 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-10-14 21:42:48,814 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 147 transitions. [2019-10-14 21:42:48,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2019-10-14 21:42:48,815 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:48,815 INFO L380 BasicCegarLoop]: trace histogram [20, 20, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:49,019 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:49,019 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:49,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:49,020 INFO L82 PathProgramCache]: Analyzing trace with hash -354452749, now seen corresponding path program 20 times [2019-10-14 21:42:49,020 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:49,020 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [214148135] [2019-10-14 21:42:49,021 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:49,021 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:49,021 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:49,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:49,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:49,330 INFO L134 CoverageAnalysis]: Checked inductivity of 546 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-10-14 21:42:49,330 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [214148135] [2019-10-14 21:42:49,331 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [517418765] [2019-10-14 21:42:49,331 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:49,404 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:42:49,404 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:49,405 INFO L256 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 22 conjunts are in the unsatisfiable core [2019-10-14 21:42:49,407 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:49,427 INFO L134 CoverageAnalysis]: Checked inductivity of 546 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-10-14 21:42:49,427 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:49,427 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2019-10-14 21:42:49,427 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1598958111] [2019-10-14 21:42:49,428 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-10-14 21:42:49,428 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:49,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-10-14 21:42:49,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-10-14 21:42:49,429 INFO L87 Difference]: Start difference. First operand 123 states and 147 transitions. Second operand 25 states. [2019-10-14 21:42:49,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:49,587 INFO L93 Difference]: Finished difference Result 202 states and 250 transitions. [2019-10-14 21:42:49,587 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-10-14 21:42:49,587 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 88 [2019-10-14 21:42:49,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:49,589 INFO L225 Difference]: With dead ends: 202 [2019-10-14 21:42:49,589 INFO L226 Difference]: Without dead ends: 126 [2019-10-14 21:42:49,590 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-10-14 21:42:49,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2019-10-14 21:42:49,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2019-10-14 21:42:49,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2019-10-14 21:42:49,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 149 transitions. [2019-10-14 21:42:49,595 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 149 transitions. Word has length 88 [2019-10-14 21:42:49,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:49,595 INFO L462 AbstractCegarLoop]: Abstraction has 125 states and 149 transitions. [2019-10-14 21:42:49,595 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-10-14 21:42:49,595 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 149 transitions. [2019-10-14 21:42:49,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2019-10-14 21:42:49,596 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:49,596 INFO L380 BasicCegarLoop]: trace histogram [21, 21, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:49,800 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:49,800 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:49,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:49,800 INFO L82 PathProgramCache]: Analyzing trace with hash -392538603, now seen corresponding path program 21 times [2019-10-14 21:42:49,800 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:49,800 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1688840188] [2019-10-14 21:42:49,801 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:49,801 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:49,801 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:49,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:50,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:50,113 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-10-14 21:42:50,114 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1688840188] [2019-10-14 21:42:50,114 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [907604232] [2019-10-14 21:42:50,114 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:50,333 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2019-10-14 21:42:50,333 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:50,335 INFO L256 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 21:42:50,337 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:50,581 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 1 proven. 145 refuted. 0 times theorem prover too weak. 441 trivial. 0 not checked. [2019-10-14 21:42:50,582 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:50,582 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 13] total 36 [2019-10-14 21:42:50,582 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1833829522] [2019-10-14 21:42:50,583 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-10-14 21:42:50,583 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:50,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-10-14 21:42:50,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=355, Invalid=905, Unknown=0, NotChecked=0, Total=1260 [2019-10-14 21:42:50,584 INFO L87 Difference]: Start difference. First operand 125 states and 149 transitions. Second operand 36 states. [2019-10-14 21:42:50,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:50,890 INFO L93 Difference]: Finished difference Result 214 states and 268 transitions. [2019-10-14 21:42:50,891 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-10-14 21:42:50,891 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 90 [2019-10-14 21:42:50,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:50,892 INFO L225 Difference]: With dead ends: 214 [2019-10-14 21:42:50,893 INFO L226 Difference]: Without dead ends: 138 [2019-10-14 21:42:50,894 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=355, Invalid=905, Unknown=0, NotChecked=0, Total=1260 [2019-10-14 21:42:50,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2019-10-14 21:42:50,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 133. [2019-10-14 21:42:50,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2019-10-14 21:42:50,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 159 transitions. [2019-10-14 21:42:50,899 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 159 transitions. Word has length 90 [2019-10-14 21:42:50,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:50,900 INFO L462 AbstractCegarLoop]: Abstraction has 133 states and 159 transitions. [2019-10-14 21:42:50,900 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-10-14 21:42:50,900 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 159 transitions. [2019-10-14 21:42:50,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2019-10-14 21:42:50,901 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:50,901 INFO L380 BasicCegarLoop]: trace histogram [22, 22, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:51,105 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:51,105 INFO L410 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:51,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:51,105 INFO L82 PathProgramCache]: Analyzing trace with hash 1768371632, now seen corresponding path program 22 times [2019-10-14 21:42:51,105 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:51,106 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1924746350] [2019-10-14 21:42:51,106 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:51,106 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:51,106 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:51,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:51,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:51,435 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 177 trivial. 0 not checked. [2019-10-14 21:42:51,435 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1924746350] [2019-10-14 21:42:51,436 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1579336159] [2019-10-14 21:42:51,436 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:51,526 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:42:51,526 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:51,527 INFO L256 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 24 conjunts are in the unsatisfiable core [2019-10-14 21:42:51,529 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:51,551 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 177 trivial. 0 not checked. [2019-10-14 21:42:51,552 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:51,552 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2019-10-14 21:42:51,552 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1043694759] [2019-10-14 21:42:51,553 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-10-14 21:42:51,553 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:51,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-10-14 21:42:51,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-10-14 21:42:51,554 INFO L87 Difference]: Start difference. First operand 133 states and 159 transitions. Second operand 27 states. [2019-10-14 21:42:51,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:51,743 INFO L93 Difference]: Finished difference Result 218 states and 270 transitions. [2019-10-14 21:42:51,743 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-10-14 21:42:51,743 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 95 [2019-10-14 21:42:51,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:51,744 INFO L225 Difference]: With dead ends: 218 [2019-10-14 21:42:51,744 INFO L226 Difference]: Without dead ends: 136 [2019-10-14 21:42:51,744 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-10-14 21:42:51,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2019-10-14 21:42:51,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 135. [2019-10-14 21:42:51,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2019-10-14 21:42:51,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 161 transitions. [2019-10-14 21:42:51,749 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 161 transitions. Word has length 95 [2019-10-14 21:42:51,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:51,749 INFO L462 AbstractCegarLoop]: Abstraction has 135 states and 161 transitions. [2019-10-14 21:42:51,749 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-10-14 21:42:51,749 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 161 transitions. [2019-10-14 21:42:51,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2019-10-14 21:42:51,750 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:51,750 INFO L380 BasicCegarLoop]: trace histogram [23, 23, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:51,954 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:51,954 INFO L410 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:51,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:51,955 INFO L82 PathProgramCache]: Analyzing trace with hash -742920114, now seen corresponding path program 23 times [2019-10-14 21:42:51,955 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:51,955 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [19377973] [2019-10-14 21:42:51,955 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:51,955 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:51,955 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:51,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:52,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:52,270 INFO L134 CoverageAnalysis]: Checked inductivity of 706 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 177 trivial. 0 not checked. [2019-10-14 21:42:52,271 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [19377973] [2019-10-14 21:42:52,271 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1637875761] [2019-10-14 21:42:52,271 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:52,927 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 23 check-sat command(s) [2019-10-14 21:42:52,927 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:52,931 INFO L256 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-14 21:42:52,932 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:53,154 INFO L134 CoverageAnalysis]: Checked inductivity of 706 backedges. 1 proven. 176 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2019-10-14 21:42:53,155 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:53,155 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 14] total 39 [2019-10-14 21:42:53,155 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842353170] [2019-10-14 21:42:53,155 INFO L442 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-10-14 21:42:53,156 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:53,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-10-14 21:42:53,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=417, Invalid=1065, Unknown=0, NotChecked=0, Total=1482 [2019-10-14 21:42:53,157 INFO L87 Difference]: Start difference. First operand 135 states and 161 transitions. Second operand 39 states. [2019-10-14 21:42:53,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:53,491 INFO L93 Difference]: Finished difference Result 230 states and 288 transitions. [2019-10-14 21:42:53,491 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-10-14 21:42:53,491 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 97 [2019-10-14 21:42:53,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:53,493 INFO L225 Difference]: With dead ends: 230 [2019-10-14 21:42:53,493 INFO L226 Difference]: Without dead ends: 148 [2019-10-14 21:42:53,495 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=417, Invalid=1065, Unknown=0, NotChecked=0, Total=1482 [2019-10-14 21:42:53,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2019-10-14 21:42:53,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 143. [2019-10-14 21:42:53,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2019-10-14 21:42:53,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 171 transitions. [2019-10-14 21:42:53,502 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 171 transitions. Word has length 97 [2019-10-14 21:42:53,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:53,503 INFO L462 AbstractCegarLoop]: Abstraction has 143 states and 171 transitions. [2019-10-14 21:42:53,503 INFO L463 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-10-14 21:42:53,503 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 171 transitions. [2019-10-14 21:42:53,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2019-10-14 21:42:53,504 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:53,504 INFO L380 BasicCegarLoop]: trace histogram [24, 24, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:53,710 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:53,710 INFO L410 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:53,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:53,711 INFO L82 PathProgramCache]: Analyzing trace with hash -1743015205, now seen corresponding path program 24 times [2019-10-14 21:42:53,711 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:53,711 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1050483028] [2019-10-14 21:42:53,711 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:53,712 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:53,712 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:53,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:54,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:54,104 INFO L134 CoverageAnalysis]: Checked inductivity of 787 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-10-14 21:42:54,105 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1050483028] [2019-10-14 21:42:54,105 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1095280233] [2019-10-14 21:42:54,105 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:55,139 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2019-10-14 21:42:55,139 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:55,142 INFO L256 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 26 conjunts are in the unsatisfiable core [2019-10-14 21:42:55,144 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:55,168 INFO L134 CoverageAnalysis]: Checked inductivity of 787 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-10-14 21:42:55,168 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:55,169 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2019-10-14 21:42:55,169 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422220019] [2019-10-14 21:42:55,169 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-10-14 21:42:55,169 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:55,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-10-14 21:42:55,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2019-10-14 21:42:55,170 INFO L87 Difference]: Start difference. First operand 143 states and 171 transitions. Second operand 29 states. [2019-10-14 21:42:55,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:55,368 INFO L93 Difference]: Finished difference Result 234 states and 290 transitions. [2019-10-14 21:42:55,369 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-10-14 21:42:55,369 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 102 [2019-10-14 21:42:55,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:55,370 INFO L225 Difference]: With dead ends: 234 [2019-10-14 21:42:55,371 INFO L226 Difference]: Without dead ends: 146 [2019-10-14 21:42:55,372 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2019-10-14 21:42:55,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2019-10-14 21:42:55,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 145. [2019-10-14 21:42:55,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 145 states. [2019-10-14 21:42:55,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 173 transitions. [2019-10-14 21:42:55,376 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 173 transitions. Word has length 102 [2019-10-14 21:42:55,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:55,376 INFO L462 AbstractCegarLoop]: Abstraction has 145 states and 173 transitions. [2019-10-14 21:42:55,377 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-10-14 21:42:55,377 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 173 transitions. [2019-10-14 21:42:55,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2019-10-14 21:42:55,377 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:55,378 INFO L380 BasicCegarLoop]: trace histogram [25, 25, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:55,583 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:55,583 INFO L410 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:55,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:55,584 INFO L82 PathProgramCache]: Analyzing trace with hash -1419810179, now seen corresponding path program 25 times [2019-10-14 21:42:55,584 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:55,584 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [830511940] [2019-10-14 21:42:55,585 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:55,585 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:55,585 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:55,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:55,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:56,006 INFO L134 CoverageAnalysis]: Checked inductivity of 836 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-10-14 21:42:56,006 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [830511940] [2019-10-14 21:42:56,006 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [293503995] [2019-10-14 21:42:56,006 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:56,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:56,108 INFO L256 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 27 conjunts are in the unsatisfiable core [2019-10-14 21:42:56,110 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:56,136 INFO L134 CoverageAnalysis]: Checked inductivity of 836 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-10-14 21:42:56,137 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:56,137 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2019-10-14 21:42:56,137 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619607606] [2019-10-14 21:42:56,137 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-10-14 21:42:56,138 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:56,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-10-14 21:42:56,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-10-14 21:42:56,138 INFO L87 Difference]: Start difference. First operand 145 states and 173 transitions. Second operand 30 states. [2019-10-14 21:42:56,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:56,348 INFO L93 Difference]: Finished difference Result 236 states and 292 transitions. [2019-10-14 21:42:56,349 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-10-14 21:42:56,349 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 104 [2019-10-14 21:42:56,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:56,350 INFO L225 Difference]: With dead ends: 236 [2019-10-14 21:42:56,350 INFO L226 Difference]: Without dead ends: 148 [2019-10-14 21:42:56,351 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-10-14 21:42:56,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2019-10-14 21:42:56,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 147. [2019-10-14 21:42:56,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2019-10-14 21:42:56,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 175 transitions. [2019-10-14 21:42:56,357 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 175 transitions. Word has length 104 [2019-10-14 21:42:56,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:56,357 INFO L462 AbstractCegarLoop]: Abstraction has 147 states and 175 transitions. [2019-10-14 21:42:56,357 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-10-14 21:42:56,358 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 175 transitions. [2019-10-14 21:42:56,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2019-10-14 21:42:56,358 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:56,358 INFO L380 BasicCegarLoop]: trace histogram [26, 26, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:56,561 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:56,562 INFO L410 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:56,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:56,563 INFO L82 PathProgramCache]: Analyzing trace with hash -57425505, now seen corresponding path program 26 times [2019-10-14 21:42:56,563 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:56,563 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1381814762] [2019-10-14 21:42:56,563 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:56,564 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:56,564 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:56,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:56,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:56,937 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-10-14 21:42:56,937 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1381814762] [2019-10-14 21:42:56,937 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1272683085] [2019-10-14 21:42:56,938 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:57,039 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:42:57,039 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:57,041 INFO L256 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 28 conjunts are in the unsatisfiable core [2019-10-14 21:42:57,043 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:57,066 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-10-14 21:42:57,067 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:57,067 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2019-10-14 21:42:57,067 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869710356] [2019-10-14 21:42:57,070 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-10-14 21:42:57,070 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:57,070 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-10-14 21:42:57,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-10-14 21:42:57,071 INFO L87 Difference]: Start difference. First operand 147 states and 175 transitions. Second operand 31 states. [2019-10-14 21:42:57,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:57,320 INFO L93 Difference]: Finished difference Result 238 states and 294 transitions. [2019-10-14 21:42:57,320 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-10-14 21:42:57,320 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 106 [2019-10-14 21:42:57,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:57,322 INFO L225 Difference]: With dead ends: 238 [2019-10-14 21:42:57,322 INFO L226 Difference]: Without dead ends: 150 [2019-10-14 21:42:57,324 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-10-14 21:42:57,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2019-10-14 21:42:57,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 149. [2019-10-14 21:42:57,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2019-10-14 21:42:57,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 177 transitions. [2019-10-14 21:42:57,331 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 177 transitions. Word has length 106 [2019-10-14 21:42:57,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:57,332 INFO L462 AbstractCegarLoop]: Abstraction has 149 states and 177 transitions. [2019-10-14 21:42:57,332 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-10-14 21:42:57,332 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 177 transitions. [2019-10-14 21:42:57,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2019-10-14 21:42:57,333 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:57,333 INFO L380 BasicCegarLoop]: trace histogram [27, 27, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:57,537 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:57,537 INFO L410 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:57,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:57,538 INFO L82 PathProgramCache]: Analyzing trace with hash -770779071, now seen corresponding path program 27 times [2019-10-14 21:42:57,538 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:57,539 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [945694507] [2019-10-14 21:42:57,539 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:57,539 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:57,539 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:57,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:58,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:58,190 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-10-14 21:42:58,191 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [945694507] [2019-10-14 21:42:58,191 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [120283928] [2019-10-14 21:42:58,191 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:58,530 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2019-10-14 21:42:58,531 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:58,533 INFO L256 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-14 21:42:58,535 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:58,827 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 1 proven. 210 refuted. 0 times theorem prover too weak. 729 trivial. 0 not checked. [2019-10-14 21:42:58,828 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:58,828 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 15] total 44 [2019-10-14 21:42:58,828 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996221267] [2019-10-14 21:42:58,829 INFO L442 AbstractCegarLoop]: Interpolant automaton has 44 states [2019-10-14 21:42:58,829 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:58,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2019-10-14 21:42:58,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=541, Invalid=1351, Unknown=0, NotChecked=0, Total=1892 [2019-10-14 21:42:58,830 INFO L87 Difference]: Start difference. First operand 149 states and 177 transitions. Second operand 44 states. [2019-10-14 21:42:59,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:59,176 INFO L93 Difference]: Finished difference Result 250 states and 312 transitions. [2019-10-14 21:42:59,176 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2019-10-14 21:42:59,176 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 108 [2019-10-14 21:42:59,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:59,178 INFO L225 Difference]: With dead ends: 250 [2019-10-14 21:42:59,178 INFO L226 Difference]: Without dead ends: 162 [2019-10-14 21:42:59,179 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 378 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=541, Invalid=1351, Unknown=0, NotChecked=0, Total=1892 [2019-10-14 21:42:59,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2019-10-14 21:42:59,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 157. [2019-10-14 21:42:59,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2019-10-14 21:42:59,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 187 transitions. [2019-10-14 21:42:59,185 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 187 transitions. Word has length 108 [2019-10-14 21:42:59,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:59,185 INFO L462 AbstractCegarLoop]: Abstraction has 157 states and 187 transitions. [2019-10-14 21:42:59,185 INFO L463 AbstractCegarLoop]: Interpolant automaton has 44 states. [2019-10-14 21:42:59,185 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 187 transitions. [2019-10-14 21:42:59,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2019-10-14 21:42:59,186 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:59,186 INFO L380 BasicCegarLoop]: trace histogram [28, 28, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:59,391 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:59,391 INFO L410 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:59,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:59,391 INFO L82 PathProgramCache]: Analyzing trace with hash 1597532292, now seen corresponding path program 28 times [2019-10-14 21:42:59,392 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:59,392 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1550033273] [2019-10-14 21:42:59,392 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:59,392 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:59,393 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:59,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:59,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:59,968 INFO L134 CoverageAnalysis]: Checked inductivity of 1032 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 248 trivial. 0 not checked. [2019-10-14 21:42:59,969 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1550033273] [2019-10-14 21:42:59,969 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1216207668] [2019-10-14 21:42:59,969 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:00,072 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:43:00,072 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:00,074 INFO L256 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 30 conjunts are in the unsatisfiable core [2019-10-14 21:43:00,076 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:00,111 INFO L134 CoverageAnalysis]: Checked inductivity of 1032 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 248 trivial. 0 not checked. [2019-10-14 21:43:00,112 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:00,112 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2019-10-14 21:43:00,112 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924626410] [2019-10-14 21:43:00,113 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-10-14 21:43:00,113 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:00,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-10-14 21:43:00,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-10-14 21:43:00,114 INFO L87 Difference]: Start difference. First operand 157 states and 187 transitions. Second operand 33 states. [2019-10-14 21:43:00,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:00,307 INFO L93 Difference]: Finished difference Result 254 states and 314 transitions. [2019-10-14 21:43:00,308 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-10-14 21:43:00,308 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 113 [2019-10-14 21:43:00,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:00,310 INFO L225 Difference]: With dead ends: 254 [2019-10-14 21:43:00,310 INFO L226 Difference]: Without dead ends: 160 [2019-10-14 21:43:00,312 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-10-14 21:43:00,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2019-10-14 21:43:00,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 159. [2019-10-14 21:43:00,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2019-10-14 21:43:00,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 189 transitions. [2019-10-14 21:43:00,322 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 189 transitions. Word has length 113 [2019-10-14 21:43:00,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:00,323 INFO L462 AbstractCegarLoop]: Abstraction has 159 states and 189 transitions. [2019-10-14 21:43:00,323 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-10-14 21:43:00,323 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 189 transitions. [2019-10-14 21:43:00,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2019-10-14 21:43:00,324 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:00,325 INFO L380 BasicCegarLoop]: trace histogram [29, 29, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:00,529 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:00,530 INFO L410 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:00,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:00,530 INFO L82 PathProgramCache]: Analyzing trace with hash -1883834462, now seen corresponding path program 29 times [2019-10-14 21:43:00,530 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:00,531 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1443392217] [2019-10-14 21:43:00,531 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:00,531 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:00,531 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:00,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:01,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:01,168 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 248 trivial. 0 not checked. [2019-10-14 21:43:01,168 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1443392217] [2019-10-14 21:43:01,169 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1620929964] [2019-10-14 21:43:01,169 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:01,917 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 29 check-sat command(s) [2019-10-14 21:43:01,917 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:01,921 INFO L256 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-14 21:43:01,922 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:02,195 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 1 proven. 247 refuted. 0 times theorem prover too weak. 841 trivial. 0 not checked. [2019-10-14 21:43:02,196 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:02,196 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 16] total 47 [2019-10-14 21:43:02,196 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2081471012] [2019-10-14 21:43:02,196 INFO L442 AbstractCegarLoop]: Interpolant automaton has 47 states [2019-10-14 21:43:02,196 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:02,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2019-10-14 21:43:02,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=617, Invalid=1545, Unknown=0, NotChecked=0, Total=2162 [2019-10-14 21:43:02,198 INFO L87 Difference]: Start difference. First operand 159 states and 189 transitions. Second operand 47 states. [2019-10-14 21:43:02,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:02,463 INFO L93 Difference]: Finished difference Result 266 states and 332 transitions. [2019-10-14 21:43:02,464 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2019-10-14 21:43:02,464 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 115 [2019-10-14 21:43:02,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:02,465 INFO L225 Difference]: With dead ends: 266 [2019-10-14 21:43:02,465 INFO L226 Difference]: Without dead ends: 172 [2019-10-14 21:43:02,466 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=617, Invalid=1545, Unknown=0, NotChecked=0, Total=2162 [2019-10-14 21:43:02,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2019-10-14 21:43:02,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 167. [2019-10-14 21:43:02,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2019-10-14 21:43:02,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 199 transitions. [2019-10-14 21:43:02,473 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 199 transitions. Word has length 115 [2019-10-14 21:43:02,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:02,474 INFO L462 AbstractCegarLoop]: Abstraction has 167 states and 199 transitions. [2019-10-14 21:43:02,474 INFO L463 AbstractCegarLoop]: Interpolant automaton has 47 states. [2019-10-14 21:43:02,474 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 199 transitions. [2019-10-14 21:43:02,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2019-10-14 21:43:02,475 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:02,475 INFO L380 BasicCegarLoop]: trace histogram [30, 30, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:02,676 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:02,676 INFO L410 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:02,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:02,677 INFO L82 PathProgramCache]: Analyzing trace with hash -1764460921, now seen corresponding path program 30 times [2019-10-14 21:43:02,677 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:02,677 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1844362023] [2019-10-14 21:43:02,677 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:02,677 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:02,677 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:02,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:03,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:03,355 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-10-14 21:43:03,355 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1844362023] [2019-10-14 21:43:03,355 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1138446537] [2019-10-14 21:43:03,356 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:07,008 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2019-10-14 21:43:07,009 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:07,015 INFO L256 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 32 conjunts are in the unsatisfiable core [2019-10-14 21:43:07,017 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:07,066 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-10-14 21:43:07,067 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:07,067 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2019-10-14 21:43:07,067 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399731804] [2019-10-14 21:43:07,068 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-10-14 21:43:07,068 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:07,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-10-14 21:43:07,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2019-10-14 21:43:07,069 INFO L87 Difference]: Start difference. First operand 167 states and 199 transitions. Second operand 35 states. [2019-10-14 21:43:07,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:07,334 INFO L93 Difference]: Finished difference Result 270 states and 334 transitions. [2019-10-14 21:43:07,334 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-10-14 21:43:07,335 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 120 [2019-10-14 21:43:07,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:07,336 INFO L225 Difference]: With dead ends: 270 [2019-10-14 21:43:07,336 INFO L226 Difference]: Without dead ends: 170 [2019-10-14 21:43:07,338 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2019-10-14 21:43:07,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2019-10-14 21:43:07,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2019-10-14 21:43:07,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2019-10-14 21:43:07,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 201 transitions. [2019-10-14 21:43:07,345 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 201 transitions. Word has length 120 [2019-10-14 21:43:07,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:07,345 INFO L462 AbstractCegarLoop]: Abstraction has 169 states and 201 transitions. [2019-10-14 21:43:07,345 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-10-14 21:43:07,346 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 201 transitions. [2019-10-14 21:43:07,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2019-10-14 21:43:07,346 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:07,347 INFO L380 BasicCegarLoop]: trace histogram [31, 31, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:07,547 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:07,547 INFO L410 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:07,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:07,548 INFO L82 PathProgramCache]: Analyzing trace with hash 1896499625, now seen corresponding path program 31 times [2019-10-14 21:43:07,548 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:07,548 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [324424613] [2019-10-14 21:43:07,549 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:07,549 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:07,549 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:07,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:08,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:08,269 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-10-14 21:43:08,269 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [324424613] [2019-10-14 21:43:08,269 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1919544768] [2019-10-14 21:43:08,269 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:08,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:08,378 INFO L256 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 33 conjunts are in the unsatisfiable core [2019-10-14 21:43:08,397 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:08,425 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-10-14 21:43:08,425 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:08,425 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2019-10-14 21:43:08,426 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601374539] [2019-10-14 21:43:08,426 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-10-14 21:43:08,426 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:08,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-10-14 21:43:08,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2019-10-14 21:43:08,427 INFO L87 Difference]: Start difference. First operand 169 states and 201 transitions. Second operand 36 states. [2019-10-14 21:43:08,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:08,659 INFO L93 Difference]: Finished difference Result 272 states and 336 transitions. [2019-10-14 21:43:08,659 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-10-14 21:43:08,659 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 122 [2019-10-14 21:43:08,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:08,661 INFO L225 Difference]: With dead ends: 272 [2019-10-14 21:43:08,661 INFO L226 Difference]: Without dead ends: 172 [2019-10-14 21:43:08,662 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2019-10-14 21:43:08,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2019-10-14 21:43:08,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 171. [2019-10-14 21:43:08,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2019-10-14 21:43:08,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 203 transitions. [2019-10-14 21:43:08,668 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 203 transitions. Word has length 122 [2019-10-14 21:43:08,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:08,668 INFO L462 AbstractCegarLoop]: Abstraction has 171 states and 203 transitions. [2019-10-14 21:43:08,668 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-10-14 21:43:08,668 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 203 transitions. [2019-10-14 21:43:08,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2019-10-14 21:43:08,669 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:08,669 INFO L380 BasicCegarLoop]: trace histogram [32, 32, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:08,873 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:08,874 INFO L410 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:08,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:08,874 INFO L82 PathProgramCache]: Analyzing trace with hash -1793598389, now seen corresponding path program 32 times [2019-10-14 21:43:08,880 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:08,880 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [347733089] [2019-10-14 21:43:08,880 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:08,880 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:08,880 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:08,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:09,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:09,414 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-10-14 21:43:09,415 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [347733089] [2019-10-14 21:43:09,415 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1687335856] [2019-10-14 21:43:09,415 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:09,516 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:43:09,516 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:09,518 INFO L256 TraceCheckSpWp]: Trace formula consists of 371 conjuncts, 34 conjunts are in the unsatisfiable core [2019-10-14 21:43:09,520 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:09,546 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-10-14 21:43:09,546 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:09,546 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2019-10-14 21:43:09,547 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817427321] [2019-10-14 21:43:09,547 INFO L442 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-10-14 21:43:09,547 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:09,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-10-14 21:43:09,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2019-10-14 21:43:09,548 INFO L87 Difference]: Start difference. First operand 171 states and 203 transitions. Second operand 37 states. [2019-10-14 21:43:09,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:09,803 INFO L93 Difference]: Finished difference Result 274 states and 338 transitions. [2019-10-14 21:43:09,803 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-10-14 21:43:09,803 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 124 [2019-10-14 21:43:09,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:09,805 INFO L225 Difference]: With dead ends: 274 [2019-10-14 21:43:09,805 INFO L226 Difference]: Without dead ends: 174 [2019-10-14 21:43:09,806 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2019-10-14 21:43:09,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2019-10-14 21:43:09,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 173. [2019-10-14 21:43:09,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2019-10-14 21:43:09,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 205 transitions. [2019-10-14 21:43:09,811 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 205 transitions. Word has length 124 [2019-10-14 21:43:09,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:09,811 INFO L462 AbstractCegarLoop]: Abstraction has 173 states and 205 transitions. [2019-10-14 21:43:09,811 INFO L463 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-10-14 21:43:09,811 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 205 transitions. [2019-10-14 21:43:09,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2019-10-14 21:43:09,812 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:09,812 INFO L380 BasicCegarLoop]: trace histogram [33, 33, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:10,015 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:10,016 INFO L410 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:10,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:10,017 INFO L82 PathProgramCache]: Analyzing trace with hash -334803347, now seen corresponding path program 33 times [2019-10-14 21:43:10,017 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:10,018 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1811674922] [2019-10-14 21:43:10,018 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:10,018 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:10,018 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:10,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:10,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:10,686 INFO L134 CoverageAnalysis]: Checked inductivity of 1377 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-10-14 21:43:10,686 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1811674922] [2019-10-14 21:43:10,687 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [891308620] [2019-10-14 21:43:10,687 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:10,973 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-10-14 21:43:10,973 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:10,975 INFO L256 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-14 21:43:10,977 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:11,309 INFO L134 CoverageAnalysis]: Checked inductivity of 1377 backedges. 1 proven. 287 refuted. 0 times theorem prover too weak. 1089 trivial. 0 not checked. [2019-10-14 21:43:11,309 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:11,309 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 17] total 52 [2019-10-14 21:43:11,309 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1298173431] [2019-10-14 21:43:11,310 INFO L442 AbstractCegarLoop]: Interpolant automaton has 52 states [2019-10-14 21:43:11,310 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:11,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2019-10-14 21:43:11,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=767, Invalid=1885, Unknown=0, NotChecked=0, Total=2652 [2019-10-14 21:43:11,311 INFO L87 Difference]: Start difference. First operand 173 states and 205 transitions. Second operand 52 states. [2019-10-14 21:43:11,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:11,795 INFO L93 Difference]: Finished difference Result 286 states and 356 transitions. [2019-10-14 21:43:11,796 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2019-10-14 21:43:11,796 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 126 [2019-10-14 21:43:11,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:11,797 INFO L225 Difference]: With dead ends: 286 [2019-10-14 21:43:11,797 INFO L226 Difference]: Without dead ends: 186 [2019-10-14 21:43:11,798 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=767, Invalid=1885, Unknown=0, NotChecked=0, Total=2652 [2019-10-14 21:43:11,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2019-10-14 21:43:11,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 181. [2019-10-14 21:43:11,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2019-10-14 21:43:11,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 215 transitions. [2019-10-14 21:43:11,806 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 215 transitions. Word has length 126 [2019-10-14 21:43:11,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:11,806 INFO L462 AbstractCegarLoop]: Abstraction has 181 states and 215 transitions. [2019-10-14 21:43:11,807 INFO L463 AbstractCegarLoop]: Interpolant automaton has 52 states. [2019-10-14 21:43:11,807 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 215 transitions. [2019-10-14 21:43:11,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2019-10-14 21:43:11,808 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:11,808 INFO L380 BasicCegarLoop]: trace histogram [34, 34, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:12,012 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:12,012 INFO L410 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:12,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:12,013 INFO L82 PathProgramCache]: Analyzing trace with hash 912852824, now seen corresponding path program 34 times [2019-10-14 21:43:12,013 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:12,014 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1534147706] [2019-10-14 21:43:12,014 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:12,014 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:12,015 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:12,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:12,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:12,565 INFO L134 CoverageAnalysis]: Checked inductivity of 1487 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 331 trivial. 0 not checked. [2019-10-14 21:43:12,566 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1534147706] [2019-10-14 21:43:12,566 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [438965393] [2019-10-14 21:43:12,566 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:12,687 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:43:12,687 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:12,688 INFO L256 TraceCheckSpWp]: Trace formula consists of 391 conjuncts, 36 conjunts are in the unsatisfiable core [2019-10-14 21:43:12,690 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:12,721 INFO L134 CoverageAnalysis]: Checked inductivity of 1487 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 331 trivial. 0 not checked. [2019-10-14 21:43:12,721 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:12,721 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37] total 39 [2019-10-14 21:43:12,721 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23847851] [2019-10-14 21:43:12,722 INFO L442 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-10-14 21:43:12,722 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:12,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-10-14 21:43:12,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2019-10-14 21:43:12,723 INFO L87 Difference]: Start difference. First operand 181 states and 215 transitions. Second operand 39 states.