/usr/bin/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/loop-acceleration/nested_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 21:20:31,238 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 21:20:31,240 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 21:20:31,257 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-06 21:20:31,258 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-06 21:20:31,260 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-06 21:20:31,262 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-06 21:20:31,271 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-06 21:20:31,275 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-06 21:20:31,278 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-06 21:20:31,280 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-06 21:20:31,282 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-06 21:20:31,282 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 21:20:31,284 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 21:20:31,286 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 21:20:31,287 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 21:20:31,289 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 21:20:31,290 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 21:20:31,291 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 21:20:31,296 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 21:20:31,300 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 21:20:31,303 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 21:20:31,305 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 21:20:31,306 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 21:20:31,308 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 21:20:31,320 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 21:20:31,321 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 21:20:31,321 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 21:20:31,322 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 [2019-11-06 21:20:31,338 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 21:20:31,339 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 21:20:31,340 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 21:20:31,340 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 21:20:31,340 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 21:20:31,340 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 21:20:31,341 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 21:20:31,341 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 21:20:31,341 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 21:20:31,341 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 21:20:31,341 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 21:20:31,342 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 21:20:31,342 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 21:20:31,342 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 21:20:31,342 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 21:20:31,342 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 21:20:31,342 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 21:20:31,343 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 21:20:31,343 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 21:20:31,343 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 21:20:31,343 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 21:20:31,343 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 21:20:31,344 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 21:20:31,344 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 21:20:31,344 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 21:20:31,344 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 21:20:31,344 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 21:20:31,345 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 21:20:31,345 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 21:20:31,641 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 21:20:31,664 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 21:20:31,667 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 21:20:31,669 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 21:20:31,669 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 21:20:31,670 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/nested_1-1.c [2019-11-06 21:20:31,746 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4ce8b2dcc/afdc63974b8d47ed8ef0d8d4472fd570/FLAG23193cd19 [2019-11-06 21:20:32,212 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 21:20:32,213 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/nested_1-1.c [2019-11-06 21:20:32,219 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4ce8b2dcc/afdc63974b8d47ed8ef0d8d4472fd570/FLAG23193cd19 [2019-11-06 21:20:32,597 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4ce8b2dcc/afdc63974b8d47ed8ef0d8d4472fd570 [2019-11-06 21:20:32,607 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 21:20:32,608 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 21:20:32,609 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 21:20:32,610 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 21:20:32,614 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 21:20:32,615 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:20:32" (1/1) ... [2019-11-06 21:20:32,618 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3a5df499 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:32, skipping insertion in model container [2019-11-06 21:20:32,619 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:20:32" (1/1) ... [2019-11-06 21:20:32,626 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 21:20:32,643 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 21:20:32,811 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 21:20:32,815 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 21:20:32,842 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 21:20:32,858 INFO L192 MainTranslator]: Completed translation [2019-11-06 21:20:32,859 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:32 WrapperNode [2019-11-06 21:20:32,859 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 21:20:32,860 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 21:20:32,861 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 21:20:32,861 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 21:20:32,947 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:32" (1/1) ... [2019-11-06 21:20:32,947 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:32" (1/1) ... [2019-11-06 21:20:32,952 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:32" (1/1) ... [2019-11-06 21:20:32,953 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:32" (1/1) ... [2019-11-06 21:20:32,956 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:32" (1/1) ... [2019-11-06 21:20:32,962 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:32" (1/1) ... [2019-11-06 21:20:32,963 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:32" (1/1) ... [2019-11-06 21:20:32,964 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 21:20:32,964 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 21:20:32,965 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 21:20:32,965 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 21:20:32,966 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:32" (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 [2019-11-06 21:20:33,018 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 21:20:33,018 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 21:20:33,018 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-06 21:20:33,018 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 21:20:33,018 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 21:20:33,018 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-06 21:20:33,019 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 21:20:33,019 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 21:20:33,019 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 21:20:33,213 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 21:20:33,214 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-11-06 21:20:33,217 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:20:33 BoogieIcfgContainer [2019-11-06 21:20:33,217 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 21:20:33,219 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 21:20:33,219 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 21:20:33,223 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 21:20:33,225 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 09:20:32" (1/3) ... [2019-11-06 21:20:33,226 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56976c55 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:20:33, skipping insertion in model container [2019-11-06 21:20:33,227 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:32" (2/3) ... [2019-11-06 21:20:33,227 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56976c55 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:20:33, skipping insertion in model container [2019-11-06 21:20:33,227 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:20:33" (3/3) ... [2019-11-06 21:20:33,236 INFO L109 eAbstractionObserver]: Analyzing ICFG nested_1-1.c [2019-11-06 21:20:33,244 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 21:20:33,251 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 21:20:33,264 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 21:20:33,289 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 21:20:33,289 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 21:20:33,289 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 21:20:33,290 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 21:20:33,291 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 21:20:33,291 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 21:20:33,291 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 21:20:33,292 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 21:20:33,315 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2019-11-06 21:20:33,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-06 21:20:33,320 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:33,321 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:33,322 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:33,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:33,327 INFO L82 PathProgramCache]: Analyzing trace with hash -873786703, now seen corresponding path program 1 times [2019-11-06 21:20:33,334 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:33,334 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1730073183] [2019-11-06 21:20:33,335 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:33,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:33,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:33,563 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:33,564 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1730073183] [2019-11-06 21:20:33,565 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 21:20:33,565 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 21:20:33,567 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725827890] [2019-11-06 21:20:33,572 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 21:20:33,573 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:33,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 21:20:33,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 21:20:33,594 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2019-11-06 21:20:33,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:33,684 INFO L93 Difference]: Finished difference Result 36 states and 49 transitions. [2019-11-06 21:20:33,685 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 21:20:33,687 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2019-11-06 21:20:33,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:33,707 INFO L225 Difference]: With dead ends: 36 [2019-11-06 21:20:33,707 INFO L226 Difference]: Without dead ends: 16 [2019-11-06 21:20:33,711 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 21:20:33,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-11-06 21:20:33,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 14. [2019-11-06 21:20:33,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-11-06 21:20:33,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2019-11-06 21:20:33,776 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2019-11-06 21:20:33,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:33,777 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2019-11-06 21:20:33,777 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 21:20:33,777 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2019-11-06 21:20:33,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-06 21:20:33,779 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:33,780 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:33,781 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:33,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:33,782 INFO L82 PathProgramCache]: Analyzing trace with hash 1621360120, now seen corresponding path program 1 times [2019-11-06 21:20:33,782 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:33,782 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1727680770] [2019-11-06 21:20:33,783 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:33,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:33,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:33,896 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:33,897 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1727680770] [2019-11-06 21:20:33,897 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 21:20:33,898 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 21:20:33,898 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [531491311] [2019-11-06 21:20:33,900 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 21:20:33,901 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:33,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 21:20:33,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 21:20:33,902 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 3 states. [2019-11-06 21:20:33,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:33,925 INFO L93 Difference]: Finished difference Result 23 states and 26 transitions. [2019-11-06 21:20:33,926 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 21:20:33,926 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2019-11-06 21:20:33,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:33,927 INFO L225 Difference]: With dead ends: 23 [2019-11-06 21:20:33,927 INFO L226 Difference]: Without dead ends: 15 [2019-11-06 21:20:33,928 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 21:20:33,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-11-06 21:20:33,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-11-06 21:20:33,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-11-06 21:20:33,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2019-11-06 21:20:33,938 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2019-11-06 21:20:33,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:33,939 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2019-11-06 21:20:33,939 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 21:20:33,939 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2019-11-06 21:20:33,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-06 21:20:33,940 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:33,940 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:33,941 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:33,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:33,941 INFO L82 PathProgramCache]: Analyzing trace with hash 1574756514, now seen corresponding path program 1 times [2019-11-06 21:20:33,942 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:33,942 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1594045925] [2019-11-06 21:20:33,942 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:33,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:34,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:34,031 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:34,032 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1594045925] [2019-11-06 21:20:34,032 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1017419661] [2019-11-06 21:20:34,032 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 [2019-11-06 21:20:34,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:34,083 INFO L256 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-06 21:20:34,088 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:34,143 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:34,143 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:34,144 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 7 [2019-11-06 21:20:34,144 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667972785] [2019-11-06 21:20:34,145 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-06 21:20:34,145 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:34,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-06 21:20:34,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2019-11-06 21:20:34,146 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 7 states. [2019-11-06 21:20:34,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:34,274 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2019-11-06 21:20:34,275 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-06 21:20:34,275 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2019-11-06 21:20:34,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:34,276 INFO L225 Difference]: With dead ends: 34 [2019-11-06 21:20:34,276 INFO L226 Difference]: Without dead ends: 25 [2019-11-06 21:20:34,277 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2019-11-06 21:20:34,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-11-06 21:20:34,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 21. [2019-11-06 21:20:34,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-06 21:20:34,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2019-11-06 21:20:34,284 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 14 [2019-11-06 21:20:34,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:34,284 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2019-11-06 21:20:34,284 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-06 21:20:34,284 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2019-11-06 21:20:34,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-06 21:20:34,285 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:34,285 INFO L410 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:34,486 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:34,486 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:34,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:34,487 INFO L82 PathProgramCache]: Analyzing trace with hash 93409041, now seen corresponding path program 2 times [2019-11-06 21:20:34,487 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:34,487 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [809259682] [2019-11-06 21:20:34,487 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:34,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:34,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:34,580 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-11-06 21:20:34,581 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [809259682] [2019-11-06 21:20:34,581 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [496636148] [2019-11-06 21:20:34,581 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 [2019-11-06 21:20:34,619 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:20:34,619 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:34,620 INFO L256 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-06 21:20:34,622 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:34,658 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-06 21:20:34,659 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:34,659 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2019-11-06 21:20:34,660 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16639263] [2019-11-06 21:20:34,660 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-06 21:20:34,661 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:34,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-06 21:20:34,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2019-11-06 21:20:34,662 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 8 states. [2019-11-06 21:20:34,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:34,922 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2019-11-06 21:20:34,922 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-06 21:20:34,922 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2019-11-06 21:20:34,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:34,923 INFO L225 Difference]: With dead ends: 46 [2019-11-06 21:20:34,923 INFO L226 Difference]: Without dead ends: 34 [2019-11-06 21:20:34,925 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2019-11-06 21:20:34,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-11-06 21:20:34,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 29. [2019-11-06 21:20:34,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-06 21:20:34,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2019-11-06 21:20:34,939 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 20 [2019-11-06 21:20:34,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:34,940 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2019-11-06 21:20:34,940 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-06 21:20:34,940 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2019-11-06 21:20:34,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-11-06 21:20:34,942 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:34,942 INFO L410 BasicCegarLoop]: trace histogram [9, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:35,149 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:35,149 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:35,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:35,150 INFO L82 PathProgramCache]: Analyzing trace with hash 50981508, now seen corresponding path program 3 times [2019-11-06 21:20:35,150 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:35,150 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1548233558] [2019-11-06 21:20:35,151 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:35,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:35,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:35,254 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 35 proven. 6 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2019-11-06 21:20:35,254 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1548233558] [2019-11-06 21:20:35,255 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1788165886] [2019-11-06 21:20:35,255 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 [2019-11-06 21:20:35,303 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-11-06 21:20:35,303 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:35,304 INFO L256 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-06 21:20:35,306 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:35,337 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 37 proven. 6 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2019-11-06 21:20:35,338 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:35,338 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2019-11-06 21:20:35,338 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637330565] [2019-11-06 21:20:35,339 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-06 21:20:35,339 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:35,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-06 21:20:35,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2019-11-06 21:20:35,339 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 7 states. [2019-11-06 21:20:35,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:35,379 INFO L93 Difference]: Finished difference Result 51 states and 59 transitions. [2019-11-06 21:20:35,380 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 21:20:35,380 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 28 [2019-11-06 21:20:35,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:35,381 INFO L225 Difference]: With dead ends: 51 [2019-11-06 21:20:35,381 INFO L226 Difference]: Without dead ends: 32 [2019-11-06 21:20:35,382 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2019-11-06 21:20:35,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-06 21:20:35,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2019-11-06 21:20:35,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-06 21:20:35,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2019-11-06 21:20:35,389 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 28 [2019-11-06 21:20:35,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:35,390 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2019-11-06 21:20:35,390 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-06 21:20:35,390 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2019-11-06 21:20:35,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-11-06 21:20:35,391 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:35,391 INFO L410 BasicCegarLoop]: trace histogram [12, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:35,603 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:35,604 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:35,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:35,604 INFO L82 PathProgramCache]: Analyzing trace with hash 1418818136, now seen corresponding path program 4 times [2019-11-06 21:20:35,605 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:35,605 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [41095795] [2019-11-06 21:20:35,605 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:35,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:35,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:35,759 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 53 proven. 10 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2019-11-06 21:20:35,759 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [41095795] [2019-11-06 21:20:35,759 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [807756271] [2019-11-06 21:20:35,759 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 [2019-11-06 21:20:35,806 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:20:35,807 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:35,808 INFO L256 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-06 21:20:35,810 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:35,928 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 94 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2019-11-06 21:20:35,928 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:35,928 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10] total 15 [2019-11-06 21:20:35,929 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3111601] [2019-11-06 21:20:35,929 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-06 21:20:35,930 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:35,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-06 21:20:35,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2019-11-06 21:20:35,930 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 15 states. [2019-11-06 21:20:36,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:36,407 INFO L93 Difference]: Finished difference Result 71 states and 84 transitions. [2019-11-06 21:20:36,408 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-11-06 21:20:36,408 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 31 [2019-11-06 21:20:36,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:36,409 INFO L225 Difference]: With dead ends: 71 [2019-11-06 21:20:36,409 INFO L226 Difference]: Without dead ends: 50 [2019-11-06 21:20:36,410 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=135, Invalid=795, Unknown=0, NotChecked=0, Total=930 [2019-11-06 21:20:36,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-11-06 21:20:36,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 43. [2019-11-06 21:20:36,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-11-06 21:20:36,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2019-11-06 21:20:36,420 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 31 [2019-11-06 21:20:36,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:36,420 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2019-11-06 21:20:36,420 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-06 21:20:36,420 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2019-11-06 21:20:36,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-11-06 21:20:36,421 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:36,422 INFO L410 BasicCegarLoop]: trace histogram [20, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:36,624 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:36,625 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:36,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:36,625 INFO L82 PathProgramCache]: Analyzing trace with hash -1949427083, now seen corresponding path program 5 times [2019-11-06 21:20:36,625 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:36,626 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1018538773] [2019-11-06 21:20:36,626 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:36,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:36,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:36,756 INFO L134 CoverageAnalysis]: Checked inductivity of 292 backedges. 112 proven. 15 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2019-11-06 21:20:36,756 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1018538773] [2019-11-06 21:20:36,756 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1148643438] [2019-11-06 21:20:36,757 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 [2019-11-06 21:20:36,816 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2019-11-06 21:20:36,817 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:36,818 INFO L256 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-06 21:20:36,820 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:36,853 INFO L134 CoverageAnalysis]: Checked inductivity of 292 backedges. 189 proven. 15 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2019-11-06 21:20:36,853 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:36,853 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2019-11-06 21:20:36,854 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442400861] [2019-11-06 21:20:36,855 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-06 21:20:36,855 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:36,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-06 21:20:36,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2019-11-06 21:20:36,856 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 9 states. [2019-11-06 21:20:36,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:36,913 INFO L93 Difference]: Finished difference Result 78 states and 89 transitions. [2019-11-06 21:20:36,914 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 21:20:36,914 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 42 [2019-11-06 21:20:36,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:36,915 INFO L225 Difference]: With dead ends: 78 [2019-11-06 21:20:36,915 INFO L226 Difference]: Without dead ends: 47 [2019-11-06 21:20:36,917 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2019-11-06 21:20:36,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-11-06 21:20:36,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2019-11-06 21:20:36,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-11-06 21:20:36,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2019-11-06 21:20:36,934 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 42 [2019-11-06 21:20:36,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:36,934 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2019-11-06 21:20:36,934 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-06 21:20:36,934 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2019-11-06 21:20:36,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-11-06 21:20:36,938 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:36,938 INFO L410 BasicCegarLoop]: trace histogram [24, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:37,142 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:37,143 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:37,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:37,143 INFO L82 PathProgramCache]: Analyzing trace with hash -649475471, now seen corresponding path program 6 times [2019-11-06 21:20:37,143 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:37,143 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [517590536] [2019-11-06 21:20:37,143 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:37,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:37,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:37,476 INFO L134 CoverageAnalysis]: Checked inductivity of 394 backedges. 151 proven. 21 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2019-11-06 21:20:37,476 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [517590536] [2019-11-06 21:20:37,477 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2106297768] [2019-11-06 21:20:37,477 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 [2019-11-06 21:20:37,565 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2019-11-06 21:20:37,565 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:37,566 INFO L256 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-06 21:20:37,569 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:37,599 INFO L134 CoverageAnalysis]: Checked inductivity of 394 backedges. 254 proven. 21 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2019-11-06 21:20:37,600 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:37,600 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2019-11-06 21:20:37,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521849423] [2019-11-06 21:20:37,601 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-06 21:20:37,601 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:37,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-06 21:20:37,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2019-11-06 21:20:37,602 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand 10 states. [2019-11-06 21:20:37,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:37,662 INFO L93 Difference]: Finished difference Result 85 states and 96 transitions. [2019-11-06 21:20:37,663 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-06 21:20:37,663 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 46 [2019-11-06 21:20:37,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:37,664 INFO L225 Difference]: With dead ends: 85 [2019-11-06 21:20:37,664 INFO L226 Difference]: Without dead ends: 51 [2019-11-06 21:20:37,665 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2019-11-06 21:20:37,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2019-11-06 21:20:37,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2019-11-06 21:20:37,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2019-11-06 21:20:37,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 55 transitions. [2019-11-06 21:20:37,672 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 55 transitions. Word has length 46 [2019-11-06 21:20:37,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:37,673 INFO L462 AbstractCegarLoop]: Abstraction has 51 states and 55 transitions. [2019-11-06 21:20:37,673 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-06 21:20:37,673 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 55 transitions. [2019-11-06 21:20:37,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-11-06 21:20:37,674 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:37,674 INFO L410 BasicCegarLoop]: trace histogram [28, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:37,886 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:37,887 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:37,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:37,887 INFO L82 PathProgramCache]: Analyzing trace with hash -1892649995, now seen corresponding path program 7 times [2019-11-06 21:20:37,888 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:37,888 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [666148006] [2019-11-06 21:20:37,888 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:37,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:38,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:38,059 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 196 proven. 28 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-11-06 21:20:38,060 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [666148006] [2019-11-06 21:20:38,060 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1958022238] [2019-11-06 21:20:38,060 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 [2019-11-06 21:20:38,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:38,120 INFO L256 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 22 conjunts are in the unsatisfiable core [2019-11-06 21:20:38,127 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:38,288 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 425 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2019-11-06 21:20:38,288 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:38,288 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 20 [2019-11-06 21:20:38,288 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482583740] [2019-11-06 21:20:38,289 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-06 21:20:38,289 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:38,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-06 21:20:38,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=321, Unknown=0, NotChecked=0, Total=380 [2019-11-06 21:20:38,290 INFO L87 Difference]: Start difference. First operand 51 states and 55 transitions. Second operand 20 states. [2019-11-06 21:20:39,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:39,243 INFO L93 Difference]: Finished difference Result 113 states and 129 transitions. [2019-11-06 21:20:39,244 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2019-11-06 21:20:39,244 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 50 [2019-11-06 21:20:39,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:39,245 INFO L225 Difference]: With dead ends: 113 [2019-11-06 21:20:39,245 INFO L226 Difference]: Without dead ends: 76 [2019-11-06 21:20:39,246 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 815 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=264, Invalid=2706, Unknown=0, NotChecked=0, Total=2970 [2019-11-06 21:20:39,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-11-06 21:20:39,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 66. [2019-11-06 21:20:39,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2019-11-06 21:20:39,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 71 transitions. [2019-11-06 21:20:39,261 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 71 transitions. Word has length 50 [2019-11-06 21:20:39,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:39,261 INFO L462 AbstractCegarLoop]: Abstraction has 66 states and 71 transitions. [2019-11-06 21:20:39,261 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-06 21:20:39,261 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 71 transitions. [2019-11-06 21:20:39,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2019-11-06 21:20:39,262 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:39,263 INFO L410 BasicCegarLoop]: trace histogram [40, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:39,466 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:39,467 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:39,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:39,467 INFO L82 PathProgramCache]: Analyzing trace with hash 1564944312, now seen corresponding path program 8 times [2019-11-06 21:20:39,468 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:39,468 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [847033849] [2019-11-06 21:20:39,468 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:39,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:39,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:39,614 INFO L134 CoverageAnalysis]: Checked inductivity of 1015 backedges. 329 proven. 36 refuted. 0 times theorem prover too weak. 650 trivial. 0 not checked. [2019-11-06 21:20:39,614 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [847033849] [2019-11-06 21:20:39,614 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1963665115] [2019-11-06 21:20:39,615 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 [2019-11-06 21:20:39,675 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:20:39,676 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:39,677 INFO L256 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 26 conjunts are in the unsatisfiable core [2019-11-06 21:20:39,679 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:39,869 INFO L134 CoverageAnalysis]: Checked inductivity of 1015 backedges. 0 proven. 868 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2019-11-06 21:20:39,870 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:39,870 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 23 [2019-11-06 21:20:39,870 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991155240] [2019-11-06 21:20:39,871 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-06 21:20:39,871 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:39,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-06 21:20:39,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2019-11-06 21:20:39,872 INFO L87 Difference]: Start difference. First operand 66 states and 71 transitions. Second operand 23 states. [2019-11-06 21:20:41,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:41,254 INFO L93 Difference]: Finished difference Result 145 states and 164 transitions. [2019-11-06 21:20:41,254 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2019-11-06 21:20:41,254 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 65 [2019-11-06 21:20:41,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:41,255 INFO L225 Difference]: With dead ends: 145 [2019-11-06 21:20:41,255 INFO L226 Difference]: Without dead ends: 94 [2019-11-06 21:20:41,258 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1479 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=351, Invalid=4619, Unknown=0, NotChecked=0, Total=4970 [2019-11-06 21:20:41,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2019-11-06 21:20:41,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 83. [2019-11-06 21:20:41,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2019-11-06 21:20:41,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 89 transitions. [2019-11-06 21:20:41,269 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 89 transitions. Word has length 65 [2019-11-06 21:20:41,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:41,269 INFO L462 AbstractCegarLoop]: Abstraction has 83 states and 89 transitions. [2019-11-06 21:20:41,270 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-06 21:20:41,270 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 89 transitions. [2019-11-06 21:20:41,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2019-11-06 21:20:41,271 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:41,271 INFO L410 BasicCegarLoop]: trace histogram [54, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:41,474 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:41,475 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:41,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:41,475 INFO L82 PathProgramCache]: Analyzing trace with hash 1497018839, now seen corresponding path program 9 times [2019-11-06 21:20:41,475 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:41,475 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [547819414] [2019-11-06 21:20:41,475 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:41,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:41,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:41,648 INFO L134 CoverageAnalysis]: Checked inductivity of 1806 backedges. 506 proven. 45 refuted. 0 times theorem prover too weak. 1255 trivial. 0 not checked. [2019-11-06 21:20:41,648 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [547819414] [2019-11-06 21:20:41,649 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [476791036] [2019-11-06 21:20:41,649 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 [2019-11-06 21:20:41,811 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2019-11-06 21:20:41,811 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:41,812 INFO L256 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 21 conjunts are in the unsatisfiable core [2019-11-06 21:20:41,815 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:41,853 INFO L134 CoverageAnalysis]: Checked inductivity of 1806 backedges. 511 proven. 45 refuted. 0 times theorem prover too weak. 1250 trivial. 0 not checked. [2019-11-06 21:20:41,854 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:41,854 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2019-11-06 21:20:41,854 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631542774] [2019-11-06 21:20:41,855 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-06 21:20:41,855 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:41,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-06 21:20:41,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2019-11-06 21:20:41,855 INFO L87 Difference]: Start difference. First operand 83 states and 89 transitions. Second operand 13 states. [2019-11-06 21:20:41,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:41,962 INFO L93 Difference]: Finished difference Result 156 states and 173 transitions. [2019-11-06 21:20:41,968 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-06 21:20:41,968 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 82 [2019-11-06 21:20:41,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:41,969 INFO L225 Difference]: With dead ends: 156 [2019-11-06 21:20:41,969 INFO L226 Difference]: Without dead ends: 89 [2019-11-06 21:20:41,970 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2019-11-06 21:20:41,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2019-11-06 21:20:41,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2019-11-06 21:20:41,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2019-11-06 21:20:41,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 95 transitions. [2019-11-06 21:20:41,980 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 95 transitions. Word has length 82 [2019-11-06 21:20:41,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:41,981 INFO L462 AbstractCegarLoop]: Abstraction has 89 states and 95 transitions. [2019-11-06 21:20:41,981 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-06 21:20:41,981 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 95 transitions. [2019-11-06 21:20:41,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2019-11-06 21:20:41,982 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:41,982 INFO L410 BasicCegarLoop]: trace histogram [60, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:42,186 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:42,187 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:42,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:42,187 INFO L82 PathProgramCache]: Analyzing trace with hash 642319569, now seen corresponding path program 10 times [2019-11-06 21:20:42,187 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:42,187 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [381603835] [2019-11-06 21:20:42,188 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:42,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:42,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:42,390 INFO L134 CoverageAnalysis]: Checked inductivity of 2181 backedges. 0 proven. 1851 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2019-11-06 21:20:42,391 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [381603835] [2019-11-06 21:20:42,391 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1006993631] [2019-11-06 21:20:42,391 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 [2019-11-06 21:20:42,479 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:20:42,479 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:42,481 INFO L256 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 30 conjunts are in the unsatisfiable core [2019-11-06 21:20:42,483 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:42,642 INFO L134 CoverageAnalysis]: Checked inductivity of 2181 backedges. 0 proven. 1900 refuted. 0 times theorem prover too weak. 281 trivial. 0 not checked. [2019-11-06 21:20:42,643 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:42,643 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 16] total 17 [2019-11-06 21:20:42,643 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [762421540] [2019-11-06 21:20:42,644 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-06 21:20:42,644 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:42,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-06 21:20:42,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2019-11-06 21:20:42,645 INFO L87 Difference]: Start difference. First operand 89 states and 95 transitions. Second operand 17 states. [2019-11-06 21:20:42,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:42,943 INFO L93 Difference]: Finished difference Result 119 states and 127 transitions. [2019-11-06 21:20:42,944 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-06 21:20:42,945 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 88 [2019-11-06 21:20:42,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:42,946 INFO L225 Difference]: With dead ends: 119 [2019-11-06 21:20:42,946 INFO L226 Difference]: Without dead ends: 114 [2019-11-06 21:20:42,947 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 82 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2019-11-06 21:20:42,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2019-11-06 21:20:42,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 102. [2019-11-06 21:20:42,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2019-11-06 21:20:42,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 109 transitions. [2019-11-06 21:20:42,958 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 109 transitions. Word has length 88 [2019-11-06 21:20:42,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:42,959 INFO L462 AbstractCegarLoop]: Abstraction has 102 states and 109 transitions. [2019-11-06 21:20:42,959 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-06 21:20:42,959 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 109 transitions. [2019-11-06 21:20:42,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2019-11-06 21:20:42,960 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:42,960 INFO L410 BasicCegarLoop]: trace histogram [70, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:43,164 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:43,165 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:43,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:43,165 INFO L82 PathProgramCache]: Analyzing trace with hash -284489192, now seen corresponding path program 11 times [2019-11-06 21:20:43,166 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:43,166 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [436982025] [2019-11-06 21:20:43,166 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:43,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:43,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:43,352 INFO L134 CoverageAnalysis]: Checked inductivity of 2975 backedges. 0 proven. 2590 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2019-11-06 21:20:43,353 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [436982025] [2019-11-06 21:20:43,353 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1635174521] [2019-11-06 21:20:43,353 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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